diff --git a/app/app/Http/Controllers/Api/BillingController.php b/app/app/Http/Controllers/Api/BillingController.php
index c8353b79..9111d23c 100644
--- a/app/app/Http/Controllers/Api/BillingController.php
+++ b/app/app/Http/Controllers/Api/BillingController.php
@@ -6,11 +6,14 @@ namespace App\Http\Controllers\Api;
 
 use App\Http\Controllers\Controller;
 use App\Models\BalanceTransaction;
+use App\Models\PricingTier;
+use App\Models\Project;
 use App\Models\Tenant;
 use App\Models\User;
 use App\Repositories\PricingTierRepository;
 use App\Services\Billing\BalanceToLeadsConverter;
 use App\Services\Billing\BillingTopupService;
+use Illuminate\Database\Eloquent\Collection;
 use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
 use Illuminate\Support\Carbon;
@@ -111,6 +114,101 @@ class BillingController extends Controller
         ]);
     }
 
+    /**
+     * GET /api/billing/balance-status — лёгкий статус баланса для UI префлайта
+     * (Billing v2 Spec C §3.6). Питает глобальный баннер заморозки
+     * (BalanceFrozenBanner: frozen_by_balance_at + дефицит) и индикатор ёмкости
+     * (BalanceCapacityIndicator: balance / capacity / required). Грузится в
+     * AppLayout на всех страницах, поэтому без tiers_preview и истории.
+     */
+    public function balanceStatus(Request $request): JsonResponse
+    {
+        /** @var User $user */
+        $user = $request->user();
+        /** @var Tenant $tenant */
+        $tenant = Tenant::query()->findOrFail((int) $user->tenant_id);
+
+        $activeTiers = app(PricingTierRepository::class)->activeAt(Carbon::now('Europe/Moscow'));
+        $deliveredInMonth = (int) ($tenant->delivered_in_month ?? 0);
+
+        $capacityLeads = (int) app(BalanceToLeadsConverter::class)->convert(
+            (string) $tenant->balance_rub,
+            $deliveredInMonth,
+            $activeTiers,
+        )['leads'];
+
+        // Требуемые лиды/день — сумма лимитов активных не-заблокированных проектов
+        // (та же выборка, что в ProjectController preflight).
+        $requiredLeads = (int) Project::query()
+            ->where('tenant_id', $tenant->id)
+            ->where('is_active', true)
+            ->whereNull('preflight_blocked_at')
+            ->sum('daily_limit_target');
+
+        $deficitLeads = max(0, $requiredLeads - $capacityLeads);
+        $deficitRub = '0.00';
+        if ($deficitLeads > 0) {
+            $needed = $this->minBalanceForLeads($requiredLeads, $deliveredInMonth, $activeTiers);
+            $deficitRub = bcsub($needed, (string) $tenant->balance_rub, 2);
+            if (bccomp($deficitRub, '0', 2) < 0) {
+                $deficitRub = '0.00';
+            }
+        }
+
+        return response()->json([
+            'frozen_by_balance_at' => $tenant->frozen_by_balance_at?->toISOString(),
+            'balance_rub' => (string) $tenant->balance_rub,
+            'capacity_leads' => $capacityLeads,
+            'required_leads_per_day' => $requiredLeads,
+            'deficit_leads' => $deficitLeads,
+            'deficit_rub' => $deficitRub,
+        ]);
+    }
+
+    /**
+     * Минимальный баланс (₽, scale 2), чтобы позволить себе $leads лидов при уже
+     * доставленных $deliveredInMonth в этом месяце — сумма цен ступеней по позициям
+     * [delivered .. delivered+leads-1]. Зеркалит логику BalanceToLeadsConverter.
+     *
+     * @param  Collection<int, PricingTier>  $tiers
+     */
+    private function minBalanceForLeads(int $leads, int $deliveredInMonth, $tiers): string
+    {
+        if ($leads <= 0) {
+            return '0.00';
+        }
+
+        $sorted = $tiers
+            ->filter(fn ($t) => (bool) $t->is_active)
+            ->sortBy('tier_no')
+            ->values();
+
+        $kopecks = '0';
+        $remaining = $leads;
+        $cumulative = 0;            // позиции [0..cumulative) пройдены предыдущими ступенями
+        $position = $deliveredInMonth;
+
+        foreach ($sorted as $tier) {
+            $unlimited = $tier->leads_in_tier === null;
+            $tierEnd = $unlimited ? PHP_INT_MAX : $cumulative + (int) $tier->leads_in_tier;
+
+            $slotsInTier = max(0, $tierEnd - max($cumulative, $position));
+            if ($slotsInTier > 0) {
+                $take = min($remaining, $slotsInTier);
+                $kopecks = bcadd($kopecks, bcmul((string) (int) $tier->price_per_lead_kopecks, (string) $take, 0), 0);
+                $remaining -= $take;
+                $position += $take;
+            }
+
+            if ($remaining <= 0 || $unlimited) {
+                break;
+            }
+            $cumulative = $tierEnd;
+        }
+
+        return bcdiv($kopecks, '100', 2);
+    }
+
     /**
      * GET /api/billing/transactions?type=topup|lead_charge|migration&page=N
      * — пагинированная история balance_transactions тенанта (20/страница).
diff --git a/app/resources/js/api/billing.ts b/app/resources/js/api/billing.ts
index b5578b88..6d744f90 100644
--- a/app/resources/js/api/billing.ts
+++ b/app/resources/js/api/billing.ts
@@ -106,3 +106,27 @@ export async function topup(amountRub: number): Promise<TopupResult> {
     const { data } = await apiClient.post<TopupResult>('/api/billing/topup', { amount_rub: amountRub });
     return data;
 }
+
+/**
+ * Ответ GET /api/billing/balance-status — лёгкий статус баланса для UI префлайта
+ * (Billing v2 Spec C §3.6): питает баннер заморозки + индикатор ёмкости.
+ */
+export interface BalanceStatus {
+    /** ISO-дата заморозки или null (не заморожен). */
+    frozen_by_balance_at: string | null;
+    balance_rub: string;
+    /** Сколько лидов покрывает баланс по текущему тарифу. */
+    capacity_leads: number;
+    /** Суммарный дневной заказ активных не-заблокированных проектов. */
+    required_leads_per_day: number;
+    /** На сколько лидов заказ превышает ёмкость (0 если хватает). */
+    deficit_leads: number;
+    /** Сколько ₽ не хватает, чтобы покрыть дефицит (scale 2, "0.00" если хватает). */
+    deficit_rub: string;
+}
+
+/** GET /api/billing/balance-status — статус для баннера заморозки и индикатора ёмкости. */
+export async function getBalanceStatus(): Promise<BalanceStatus> {
+    const { data } = await apiClient.get<BalanceStatus>('/api/billing/balance-status');
+    return data;
+}
diff --git a/app/resources/js/components/billing/BalanceCapacityIndicator.vue b/app/resources/js/components/billing/BalanceCapacityIndicator.vue
new file mode 100644
index 00000000..3dd16edb
--- /dev/null
+++ b/app/resources/js/components/billing/BalanceCapacityIndicator.vue
@@ -0,0 +1,68 @@
+<script setup lang="ts">
+/**
+ * Постоянная подсказка под балансом (Billing v2 Spec C §3.6, Task 1.10).
+ *
+ * Чистый presentational-компонент: показывает, на сколько дней хватит ёмкости
+ * баланса (в лидах) при текущем дневном заказе всех eligible-проектов.
+ * Зелёный — хватает на 3+ дня; жёлтый — меньше 3 дней; красный — не хватает.
+ */
+import { computed } from 'vue';
+
+const props = defineProps<{
+    /** Баланс в рублях (строка scale 2, например "1000.00"). */
+    balanceRub: string;
+    /** Сколько лидов покрывает баланс по текущему тарифу. */
+    capacityLeads: number;
+    /** Суммарный дневной заказ всех активных проектов (лидов/день). */
+    requiredLeadsPerDay: number;
+}>();
+
+const daysLeft = computed(() =>
+    props.requiredLeadsPerDay > 0 ? props.capacityLeads / props.requiredLeadsPerDay : Infinity,
+);
+
+const statusClass = computed(() => {
+    if (props.requiredLeadsPerDay > 0 && props.capacityLeads < props.requiredLeadsPerDay) {
+        return 'capacity-insufficient';
+    }
+    if (daysLeft.value < 3) return 'capacity-warning';
+    return 'capacity-ok';
+});
+
+const daysLabel = computed(() => (Number.isFinite(daysLeft.value) ? daysLeft.value.toFixed(1) : '∞'));
+</script>
+
+<template>
+    <div class="balance-capacity text-body-2" :class="statusClass" data-testid="balance-capacity-indicator">
+        <div>Баланс: {{ balanceRub }}₽ = до {{ capacityLeads }} лидов по тарифу</div>
+        <div>Проекты заказывают: {{ requiredLeadsPerDay }} лидов в день</div>
+        <div v-if="statusClass === 'capacity-insufficient'" class="capacity-note">
+            ⚠️ Не хватает — пополните счёт
+        </div>
+        <div v-else-if="statusClass === 'capacity-warning'" class="capacity-note">
+            Хватит на ~{{ daysLabel }} дн. — скоро потребуется пополнение
+        </div>
+        <div v-else class="capacity-note">✅ Хватит на ~{{ daysLabel }} дн.</div>
+    </div>
+</template>
+
+<style scoped>
+.balance-capacity {
+    display: flex;
+    flex-direction: column;
+    gap: 2px;
+    line-height: 1.4;
+}
+.capacity-note {
+    font-weight: 600;
+}
+.capacity-ok .capacity-note {
+    color: rgb(var(--v-theme-success));
+}
+.capacity-warning .capacity-note {
+    color: rgb(var(--v-theme-warning));
+}
+.capacity-insufficient .capacity-note {
+    color: rgb(var(--v-theme-error));
+}
+</style>
diff --git a/app/resources/js/components/billing/BalanceFrozenBanner.vue b/app/resources/js/components/billing/BalanceFrozenBanner.vue
new file mode 100644
index 00000000..64379083
--- /dev/null
+++ b/app/resources/js/components/billing/BalanceFrozenBanner.vue
@@ -0,0 +1,52 @@
+<script setup lang="ts">
+/**
+ * Красный баннер заморозки баланса (Billing v2 Spec C §3.6, Task 1.10).
+ *
+ * Показывается на всех страницах, когда tenant.frozen_by_balance_at !== null
+ * (проп `frozen`). Источник данных — tenantStore, загружаемый глобально в
+ * AppLayout. Чистый presentational-компонент.
+ */
+import { computed } from 'vue';
+
+const props = defineProps<{
+    frozen: boolean;
+    /** Сколько ₽ не хватает на дневной заказ (строка scale 2). */
+    deficitRub?: string;
+    /** Сколько лидов превышают ёмкость баланса. */
+    deficitLeads?: number;
+}>();
+
+const hasDeficit = computed(() => (props.deficitLeads ?? 0) > 0);
+</script>
+
+<template>
+    <v-alert
+        v-if="frozen"
+        type="error"
+        variant="tonal"
+        density="comfortable"
+        rounded="lg"
+        class="balance-frozen-banner ma-4 mb-0"
+        data-testid="balance-frozen-banner"
+    >
+        <div class="text-subtitle-2 font-weight-bold">Приём лидов приостановлен</div>
+        <div class="text-body-2 mb-2">
+            Не хватает баланса на дневной заказ.<span v-if="hasDeficit">
+                Нужно ещё {{ deficitRub }}₽ (или сократи лимиты на {{ deficitLeads }} лидов).</span>
+        </div>
+        <RouterLink to="/billing" data-testid="banner-topup-link" class="banner-link">
+            Пополнить счёт
+        </RouterLink>
+        <RouterLink to="/projects" data-testid="banner-projects-link" class="banner-link ml-4">
+            Перейти к проектам
+        </RouterLink>
+    </v-alert>
+</template>
+
+<style scoped>
+.banner-link {
+    font-weight: 600;
+    color: rgb(var(--v-theme-error));
+    text-decoration: underline;
+}
+</style>
diff --git a/app/resources/js/components/projects/ProjectLimitOverloadDialog.vue b/app/resources/js/components/projects/ProjectLimitOverloadDialog.vue
new file mode 100644
index 00000000..d847a516
--- /dev/null
+++ b/app/resources/js/components/projects/ProjectLimitOverloadDialog.vue
@@ -0,0 +1,70 @@
+<script setup lang="ts">
+/**
+ * Диалог перегрузки лимита (Billing v2 Spec C §6.2, Task 1.10).
+ *
+ * Открывается, когда POST/PATCH /api/projects вернул 409 `balance_insufficient`.
+ * Показывает дефицит и предлагает три исхода:
+ *  - «Сохранить и приостановить» → save-blocked (родитель пере-сабмитит с
+ *    force_save_blocked=true → проект создаётся с preflight_blocked_at);
+ *  - «Поставить лимит 0»          → set-zero (родитель ставит daily_limit_target=0);
+ *  - «Отмена»                     → закрытие без сохранения.
+ */
+export interface OverloadPayload {
+    current_balance_rub: string;
+    current_capacity_leads: number;
+    would_be_required_leads: number;
+    deficit_leads: number;
+}
+
+defineProps<{
+    modelValue: boolean;
+    payload: OverloadPayload | null;
+}>();
+
+defineEmits<{
+    'update:modelValue': [value: boolean];
+    'save-blocked': [];
+    'set-zero': [];
+}>();
+</script>
+
+<template>
+    <v-dialog
+        :model-value="modelValue"
+        max-width="520"
+        @update:model-value="$emit('update:modelValue', $event)"
+    >
+        <v-card v-if="payload" data-testid="overload-dialog">
+            <v-card-title>Лимит превышает баланс</v-card-title>
+            <v-card-text>
+                <p>
+                    У тебя {{ payload.current_balance_rub }}₽ =
+                    {{ payload.current_capacity_leads }} лидов по текущему тарифу.
+                </p>
+                <p>После сохранения нужно {{ payload.would_be_required_leads }} лидов.</p>
+                <p class="font-weight-medium">Не хватает: {{ payload.deficit_leads }} лидов.</p>
+                <p class="text-medium-emphasis mt-2">
+                    Чтобы проект начал работать — пополни счёт, поставь его лимит 0
+                    или уменьши лимиты других проектов.
+                </p>
+            </v-card-text>
+            <v-card-actions>
+                <v-spacer />
+                <v-btn variant="text" data-testid="overload-cancel" @click="$emit('update:modelValue', false)">
+                    Отмена
+                </v-btn>
+                <v-btn variant="text" data-testid="overload-set-zero" @click="$emit('set-zero')">
+                    Поставить лимит 0
+                </v-btn>
+                <v-btn
+                    color="primary"
+                    variant="flat"
+                    data-testid="overload-save-blocked"
+                    @click="$emit('save-blocked')"
+                >
+                    Сохранить и приостановить
+                </v-btn>
+            </v-card-actions>
+        </v-card>
+    </v-dialog>
+</template>
diff --git a/app/resources/js/layouts/AppLayout.vue b/app/resources/js/layouts/AppLayout.vue
index 2233c0b0..072df2e3 100644
--- a/app/resources/js/layouts/AppLayout.vue
+++ b/app/resources/js/layouts/AppLayout.vue
@@ -14,16 +14,19 @@ import { RouterView, useRoute } from 'vue-router';
 import { useAuthStore } from '../stores/auth';
 import { useNotificationsStore } from '../stores/notifications';
 import { useRemindersStore } from '../stores/reminders';
+import { useTenantStore } from '../stores/tenantStore';
 import { usePolling } from '../composables/usePolling';
 import { POLLING_INTERVAL_MS, POLLING_REMINDERS_INTERVAL_MS } from '../constants/polling';
 import AppSidebar from '../components/layout/AppSidebar.vue';
 import AppTopbar from '../components/layout/AppTopbar.vue';
 import DevIndexBadge from '../components/DevIndexBadge.vue';
 import CommandPalette from '../components/layout/CommandPalette.vue';
+import BalanceFrozenBanner from '../components/billing/BalanceFrozenBanner.vue';
 
 const auth = useAuthStore();
 const notifications = useNotificationsStore();
 const reminders = useRemindersStore();
+const tenant = useTenantStore();
 const route = useRoute();
 
 const drawerOpen = ref(true);
@@ -60,12 +63,19 @@ async function loadReminderCounts(): Promise<void> {
     await reminders.refreshCounts();
 }
 
+async function loadBalanceStatus(): Promise<void> {
+    if (!auth.user) return;
+    await tenant.load();
+}
+
 onMounted(() => {
     void loadNotifications();
     void loadReminderCounts();
+    void loadBalanceStatus();
 });
 usePolling(loadNotifications, { intervalMs: POLLING_INTERVAL_MS, enabled: true });
 usePolling(loadReminderCounts, { intervalMs: POLLING_REMINDERS_INTERVAL_MS, enabled: true });
+usePolling(loadBalanceStatus, { intervalMs: POLLING_REMINDERS_INTERVAL_MS, enabled: true });
 </script>
 
 <template>
@@ -74,6 +84,11 @@ usePolling(loadReminderCounts, { intervalMs: POLLING_REMINDERS_INTERVAL_MS, enab
         <AppTopbar :page-title="currentPageTitle" @toggle-drawer="drawerOpen = !drawerOpen" />
 
         <v-main class="app-main">
+            <BalanceFrozenBanner
+                :frozen="tenant.frozen"
+                :deficit-rub="tenant.deficitRub"
+                :deficit-leads="tenant.deficitLeads"
+            />
             <RouterView v-slot="{ Component, route: r }">
                 <Transition :name="(r.meta.transition as string) ?? 'ld-route-fadeup'" mode="out-in">
                     <component :is="Component" :key="r.fullPath" />
diff --git a/app/resources/js/stores/tenantStore.ts b/app/resources/js/stores/tenantStore.ts
new file mode 100644
index 00000000..58193177
--- /dev/null
+++ b/app/resources/js/stores/tenantStore.ts
@@ -0,0 +1,43 @@
+import { defineStore } from 'pinia';
+import { computed, ref } from 'vue';
+import * as billingApi from '../api/billing';
+import type { BalanceStatus } from '../api/billing';
+
+/**
+ * Tenant-store: статус баланса текущего тенанта для UI префлайта (Billing v2
+ * Spec C Task 1.10). Единый источник для глобального баннера заморозки
+ * (BalanceFrozenBanner в AppLayout) и индикатора ёмкости (BalanceCapacityIndicator
+ * в BillingView) — чтобы не делать два запроса.
+ *
+ * Загружается глобально в AppLayout (load + polling). `load()` молча проглатывает
+ * ошибку: баннер/индикатор не критичны и не должны валить страницу.
+ */
+export const useTenantStore = defineStore('tenant', () => {
+    const status = ref<BalanceStatus | null>(null);
+
+    const frozen = computed(() => status.value?.frozen_by_balance_at != null);
+    const deficitRub = computed(() => status.value?.deficit_rub ?? '0.00');
+    const deficitLeads = computed(() => status.value?.deficit_leads ?? 0);
+    const balanceRub = computed(() => status.value?.balance_rub ?? '0.00');
+    const capacityLeads = computed(() => status.value?.capacity_leads ?? 0);
+    const requiredLeadsPerDay = computed(() => status.value?.required_leads_per_day ?? 0);
+
+    async function load(): Promise<void> {
+        try {
+            status.value = await billingApi.getBalanceStatus();
+        } catch {
+            // Не критично — оставляем прошлый статус (или null → баннер скрыт).
+        }
+    }
+
+    return {
+        status,
+        frozen,
+        deficitRub,
+        deficitLeads,
+        balanceRub,
+        capacityLeads,
+        requiredLeadsPerDay,
+        load,
+    };
+});
diff --git a/app/resources/js/views/BillingView.vue b/app/resources/js/views/BillingView.vue
index 022a532e..57f42a68 100644
--- a/app/resources/js/views/BillingView.vue
+++ b/app/resources/js/views/BillingView.vue
@@ -11,6 +11,7 @@
  */
 import { ref, computed, onMounted } from 'vue';
 import BalanceCard from '../components/billing/BalanceCard.vue';
+import BalanceCapacityIndicator from '../components/billing/BalanceCapacityIndicator.vue';
 import TierPricesPanel from '../components/billing/TierPricesPanel.vue';
 import TransactionsTable from '../components/billing/TransactionsTable.vue';
 import InvoicesTable from '../components/billing/InvoicesTable.vue';
@@ -19,8 +20,10 @@ import ChargesTab from './billing/ChargesTab.vue';
 import { formatPlain, featureLabel } from '../composables/billingFormatters';
 import { getWallet, type Wallet } from '../api/billing';
 import { extractErrorMessage } from '../api/client';
+import { useTenantStore } from '../stores/tenantStore';
 
 const activeView = ref<'overview' | 'charges'>('overview');
+const tenant = useTenantStore();
 
 const wallet = ref<Wallet | null>(null);
 const loading = ref(true);
@@ -59,10 +62,15 @@ async function onTopupSuccess(): Promise<void> {
     topupOpen.value = false;
     topupSnackbar.value = true;
     await loadWallet();
+    // Пополнение могло снять заморозку → обновляем статус баланса (баннер/индикатор).
+    await tenant.load();
     txTableRef.value?.refresh();
 }
 
-onMounted(loadWallet);
+onMounted(() => {
+    void loadWallet();
+    void tenant.load();
+});
 
 defineExpose({ loadWallet, wallet, topupOpen });
 </script>
@@ -117,6 +125,14 @@ defineExpose({ loadWallet, wallet, topupOpen });
                         @topup="topupOpen = true"
                     />
 
+                    <BalanceCapacityIndicator
+                        v-if="tenant.status"
+                        class="mt-3"
+                        :balance-rub="tenant.balanceRub"
+                        :capacity-leads="tenant.capacityLeads"
+                        :required-leads-per-day="tenant.requiredLeadsPerDay"
+                    />
+
                     <TierPricesPanel :tiers="tiersPreview" :current-tier-no="currentTierNo" />
 
                     <TransactionsTable ref="txTableRef" />
diff --git a/app/resources/js/views/projects/NewProjectDialog.vue b/app/resources/js/views/projects/NewProjectDialog.vue
index 6fbd7ac9..2d5e3f20 100644
--- a/app/resources/js/views/projects/NewProjectDialog.vue
+++ b/app/resources/js/views/projects/NewProjectDialog.vue
@@ -190,6 +190,13 @@
             </v-card-actions>
         </v-card>
     </v-dialog>
+
+    <ProjectLimitOverloadDialog
+        v-model="overloadOpen"
+        :payload="overloadPayload"
+        @save-blocked="onOverloadSaveBlocked"
+        @set-zero="onOverloadSetZero"
+    />
 </template>
 
 <script setup lang="ts">
@@ -199,6 +206,7 @@ import { REGIONS, FEDERAL_DISTRICT_NAMES } from '../../constants/regions';
 import { repositionMenuAfterOpen } from '../../utils/menuRepositionFix';
 import type { Project } from '../../stores/projectsStore';
 import DevIndexBadge from '../../components/DevIndexBadge.vue';
+import ProjectLimitOverloadDialog from '../../components/projects/ProjectLimitOverloadDialog.vue';
 
 const selectableRegions = REGIONS.filter((r) => r.code !== 0);
 
@@ -225,6 +233,16 @@ const errors = reactive<Record<string, string[]>>({});
 const saving = ref(false);
 const generalError = ref<string | null>(null);
 
+// Spec C §6.2: префлайт баланса — диалог перегрузки лимита по 409.
+interface OverloadPayloadShape {
+    current_balance_rub: string;
+    current_capacity_leads: number;
+    would_be_required_leads: number;
+    deficit_leads: number;
+}
+const overloadOpen = ref(false);
+const overloadPayload = ref<OverloadPayloadShape | null>(null);
+
 // Plan 4 Task 4: обязательный выбор региона + явная «Вся РФ» с подтверждением.
 // vsyaRf — чекбокс выбран; vsyaRfConfirmed — подтверждён через предупреждение.
 // На бэке regions=[] (Вся РФ) и «забыл» неотличимы → гейт намеренно UI-only.
@@ -303,6 +321,37 @@ watch(
     { immediate: true },
 );
 
+async function persist(extra: Record<string, unknown> = {}): Promise<void> {
+    saving.value = true;
+    try {
+        await ensureCsrfCookie();
+        const body = { ...form, ...extra };
+        if (props.mode === 'edit' && props.project) {
+            await apiClient.patch(`/api/projects/${props.project.id}`, body);
+        } else {
+            await apiClient.post('/api/projects', body);
+        }
+        overloadOpen.value = false;
+        emit('saved');
+        close();
+    } catch (e: unknown) {
+        const err = e as {
+            response?: { status?: number; data?: { error?: string; errors?: Record<string, string[]> } };
+        };
+        // Spec C §6.2: лимит превышает баланс — открываем диалог перегрузки.
+        if (err.response?.status === 409 && err.response.data?.error === 'balance_insufficient') {
+            overloadPayload.value = err.response.data as OverloadPayloadShape;
+            overloadOpen.value = true;
+        } else if (err.response?.status === 422 && err.response.data?.errors) {
+            Object.assign(errors, err.response.data.errors);
+        } else {
+            generalError.value = extractErrorMessage(e);
+        }
+    } finally {
+        saving.value = false;
+    }
+}
+
 async function submit() {
     generalError.value = null;
     Object.keys(errors).forEach((k) => delete errors[k]);
@@ -313,26 +362,18 @@ async function submit() {
         return;
     }
 
-    saving.value = true;
-    try {
-        await ensureCsrfCookie();
-        if (props.mode === 'edit' && props.project) {
-            await apiClient.patch(`/api/projects/${props.project.id}`, { ...form });
-        } else {
-            await apiClient.post('/api/projects', { ...form });
-        }
-        emit('saved');
-        close();
-    } catch (e: unknown) {
-        const err = e as { response?: { status?: number; data?: { errors?: Record<string, string[]> } } };
-        if (err.response?.status === 422 && err.response.data?.errors) {
-            Object.assign(errors, err.response.data.errors);
-        } else {
-            generalError.value = extractErrorMessage(e);
-        }
-    } finally {
-        saving.value = false;
-    }
+    await persist();
+}
+
+// Spec C §6.2 — исходы диалога перегрузки лимита.
+async function onOverloadSaveBlocked(): Promise<void> {
+    await persist({ force_save_blocked: true });
+}
+
+async function onOverloadSetZero(): Promise<void> {
+    form.daily_limit_target = 0;
+    overloadOpen.value = false;
+    await persist();
 }
 
 function close() {
diff --git a/app/routes/web.php b/app/routes/web.php
index 23219c68..31815574 100644
--- a/app/routes/web.php
+++ b/app/routes/web.php
@@ -189,6 +189,7 @@ Route::middleware(['auth:sanctum', 'tenant'])->prefix('/api/billing/charges')->g
 Route::middleware(['auth:sanctum', 'tenant'])->prefix('/api/billing')->group(function () {
     Route::post('/topup', 'App\Http\Controllers\Api\BillingController@topup');
     Route::get('/wallet', 'App\Http\Controllers\Api\BillingController@wallet');
+    Route::get('/balance-status', 'App\Http\Controllers\Api\BillingController@balanceStatus');
     Route::get('/transactions', 'App\Http\Controllers\Api\BillingController@transactions');
     Route::get('/invoices', 'App\Http\Controllers\Api\BillingController@invoices');
 });
diff --git a/app/tests/Feature/Billing/BalanceStatusTest.php b/app/tests/Feature/Billing/BalanceStatusTest.php
new file mode 100644
index 00000000..3ba2650e
--- /dev/null
+++ b/app/tests/Feature/Billing/BalanceStatusTest.php
@@ -0,0 +1,107 @@
+<?php
+
+declare(strict_types=1);
+
+use App\Models\Project;
+use App\Models\Tenant;
+use App\Models\User;
+use Database\Seeders\PricingTierSeeder;
+use Illuminate\Foundation\Testing\DatabaseTransactions;
+
+uses(DatabaseTransactions::class);
+
+/**
+ * GET /api/billing/balance-status — статус баланса для UI префлайта (Billing v2
+ * Spec C Task 1.10): питает баннер заморозки (BalanceFrozenBanner) и индикатор
+ * ёмкости (BalanceCapacityIndicator).
+ *
+ * PricingTierSeeder: ступень 1 — 100 лидов × 500₽ (см. BillingOverviewControllerTest).
+ */
+beforeEach(function () {
+    $this->seed(PricingTierSeeder::class);
+    $this->tenant = Tenant::factory()->create([
+        'balance_rub' => '5000.00',
+        'delivered_in_month' => 0,
+        'frozen_by_balance_at' => null,
+    ]);
+    $this->user = User::factory()->create(['tenant_id' => $this->tenant->id]);
+    $this->actingAs($this->user);
+});
+
+test('GET /api/billing/balance-status: структура ответа', function () {
+    $this->getJson('/api/billing/balance-status')
+        ->assertOk()
+        ->assertJsonStructure([
+            'frozen_by_balance_at',
+            'balance_rub',
+            'capacity_leads',
+            'required_leads_per_day',
+            'deficit_leads',
+            'deficit_rub',
+        ]);
+});
+
+test('balance-status: хватает баланса — deficit=0, не заморожен', function () {
+    // 5000₽ при ступени 1 (500₽/лид) = 10 лидов ёмкости. Проект лимит 5 — впритык.
+    Project::factory()->create([
+        'tenant_id' => $this->tenant->id,
+        'is_active' => true,
+        'daily_limit_target' => 5,
+    ]);
+
+    $resp = $this->getJson('/api/billing/balance-status')->assertOk();
+
+    expect($resp->json('balance_rub'))->toBe('5000.00');
+    expect($resp->json('capacity_leads'))->toBe(10);
+    expect($resp->json('required_leads_per_day'))->toBe(5);
+    expect($resp->json('deficit_leads'))->toBe(0);
+    expect($resp->json('deficit_rub'))->toBe('0.00');
+    expect($resp->json('frozen_by_balance_at'))->toBeNull();
+});
+
+test('balance-status: не хватает — deficit_leads + deficit_rub точные', function () {
+    // Ёмкость = 10 лидов. Проект лимит 25 → нужно 25, дефицит 15 лидов.
+    // minBalanceForLeads(25) = 25 × 500₽ = 12500₽ → deficit_rub = 12500 − 5000 = 7500.00.
+    Project::factory()->create([
+        'tenant_id' => $this->tenant->id,
+        'is_active' => true,
+        'daily_limit_target' => 25,
+    ]);
+
+    $resp = $this->getJson('/api/billing/balance-status')->assertOk();
+
+    expect($resp->json('capacity_leads'))->toBe(10);
+    expect($resp->json('required_leads_per_day'))->toBe(25);
+    expect($resp->json('deficit_leads'))->toBe(15);
+    expect($resp->json('deficit_rub'))->toBe('7500.00');
+});
+
+test('balance-status: required исключает inactive и preflight_blocked проекты', function () {
+    Project::factory()->create([
+        'tenant_id' => $this->tenant->id, 'is_active' => true, 'daily_limit_target' => 5,
+    ]);
+    Project::factory()->create([
+        'tenant_id' => $this->tenant->id, 'is_active' => false, 'daily_limit_target' => 100,
+    ]);
+    Project::factory()->create([
+        'tenant_id' => $this->tenant->id, 'is_active' => true, 'daily_limit_target' => 100,
+        'preflight_blocked_at' => now(),
+    ]);
+
+    $resp = $this->getJson('/api/billing/balance-status')->assertOk();
+
+    expect($resp->json('required_leads_per_day'))->toBe(5);
+});
+
+test('balance-status: возвращает frozen_by_balance_at когда установлен', function () {
+    $this->tenant->update(['frozen_by_balance_at' => now()]);
+
+    $resp = $this->getJson('/api/billing/balance-status')->assertOk();
+
+    expect($resp->json('frozen_by_balance_at'))->not->toBeNull();
+});
+
+test('GET /api/billing/balance-status без auth: 401', function () {
+    auth()->logout();
+    $this->getJson('/api/billing/balance-status')->assertStatus(401);
+});
diff --git a/app/tests/Frontend/BalanceCapacityIndicator.spec.ts b/app/tests/Frontend/BalanceCapacityIndicator.spec.ts
new file mode 100644
index 00000000..0ab1e7f4
--- /dev/null
+++ b/app/tests/Frontend/BalanceCapacityIndicator.spec.ts
@@ -0,0 +1,46 @@
+import { describe, it, expect } from 'vitest';
+import { mount } from '@vue/test-utils';
+import BalanceCapacityIndicator from '../../resources/js/components/billing/BalanceCapacityIndicator.vue';
+
+// Billing v2 Spec C Task 1.10 — подсказка под балансом (§3.6). Чистый
+// presentational-компонент: статус по соотношению ёмкости и требуемого/день.
+
+describe('BalanceCapacityIndicator', () => {
+    it('зелёный, когда ёмкости хватает на 3+ дня', () => {
+        const w = mount(BalanceCapacityIndicator, {
+            props: { balanceRub: '3000.00', capacityLeads: 90, requiredLeadsPerDay: 25 },
+        });
+        expect(w.text()).toContain('90');
+        expect(w.classes()).toContain('capacity-ok');
+    });
+
+    it('жёлтый, когда ёмкости хватает меньше чем на 3 дня', () => {
+        const w = mount(BalanceCapacityIndicator, {
+            props: { balanceRub: '1000.00', capacityLeads: 30, requiredLeadsPerDay: 25 },
+        });
+        expect(w.classes()).toContain('capacity-warning');
+    });
+
+    it('красный, когда ёмкости меньше требуемого', () => {
+        const w = mount(BalanceCapacityIndicator, {
+            props: { balanceRub: '500.00', capacityLeads: 10, requiredLeadsPerDay: 25 },
+        });
+        expect(w.classes()).toContain('capacity-insufficient');
+    });
+
+    it('зелёный (бесконечный запас), когда проекты ничего не заказывают', () => {
+        const w = mount(BalanceCapacityIndicator, {
+            props: { balanceRub: '500.00', capacityLeads: 10, requiredLeadsPerDay: 0 },
+        });
+        expect(w.classes()).toContain('capacity-ok');
+    });
+
+    it('показывает баланс, ёмкость и дневной заказ', () => {
+        const w = mount(BalanceCapacityIndicator, {
+            props: { balanceRub: '1000.00', capacityLeads: 30, requiredLeadsPerDay: 25 },
+        });
+        expect(w.text()).toContain('1000.00');
+        expect(w.text()).toContain('30');
+        expect(w.text()).toContain('25');
+    });
+});
diff --git a/app/tests/Frontend/BalanceFrozenBanner.spec.ts b/app/tests/Frontend/BalanceFrozenBanner.spec.ts
new file mode 100644
index 00000000..e5da52b0
--- /dev/null
+++ b/app/tests/Frontend/BalanceFrozenBanner.spec.ts
@@ -0,0 +1,48 @@
+import { describe, it, expect } from 'vitest';
+import { mount } from '@vue/test-utils';
+import { createVuetify } from 'vuetify';
+import BalanceFrozenBanner from '../../resources/js/components/billing/BalanceFrozenBanner.vue';
+
+// Billing v2 Spec C Task 1.10 — красный баннер заморозки (§3.6). Показывается
+// на всех страницах, когда tenant.frozen_by_balance_at !== null.
+
+const routerLinkStub = {
+    RouterLink: {
+        props: ['to'],
+        inheritAttrs: false,
+        template: '<a v-bind="$attrs" :href="to"><slot /></a>',
+    },
+};
+
+const mountBanner = (props: { frozen: boolean; deficitRub?: string; deficitLeads?: number }) =>
+    mount(BalanceFrozenBanner, {
+        props,
+        global: { plugins: [createVuetify()], stubs: routerLinkStub },
+    });
+
+describe('BalanceFrozenBanner', () => {
+    it('не заморожен — баннер не рендерится', () => {
+        const w = mountBanner({ frozen: false });
+        expect(w.find('[data-testid="balance-frozen-banner"]').exists()).toBe(false);
+    });
+
+    it('заморожен — красный баннер с текстом «приостановлен»', () => {
+        const w = mountBanner({ frozen: true, deficitRub: '380.00', deficitLeads: 10 });
+        const banner = w.find('[data-testid="balance-frozen-banner"]');
+        expect(banner.exists()).toBe(true);
+        expect(banner.text()).toContain('приостановлен');
+    });
+
+    it('показывает дефицит в рублях и лидах', () => {
+        const w = mountBanner({ frozen: true, deficitRub: '380.00', deficitLeads: 10 });
+        const text = w.find('[data-testid="balance-frozen-banner"]').text();
+        expect(text).toContain('380');
+        expect(text).toContain('10');
+    });
+
+    it('две ссылки — на /billing и на /projects', () => {
+        const w = mountBanner({ frozen: true, deficitRub: '380.00', deficitLeads: 10 });
+        expect(w.find('[data-testid="banner-topup-link"]').attributes('href')).toBe('/billing');
+        expect(w.find('[data-testid="banner-projects-link"]').attributes('href')).toBe('/projects');
+    });
+});
diff --git a/app/tests/Frontend/BillingView.spec.ts b/app/tests/Frontend/BillingView.spec.ts
index ae31c0f7..e4e9cc14 100644
--- a/app/tests/Frontend/BillingView.spec.ts
+++ b/app/tests/Frontend/BillingView.spec.ts
@@ -1,5 +1,6 @@
 import { describe, it, expect, vi, beforeEach } from 'vitest';
 import { mount, flushPromises } from '@vue/test-utils';
+import { createPinia, setActivePinia } from 'pinia';
 import { createVuetify } from 'vuetify';
 import BillingView from '../../resources/js/views/BillingView.vue';
 import * as billingApi from '../../resources/js/api/billing';
@@ -31,13 +32,14 @@ function makeWallet(): Wallet {
 
 describe('BillingView.vue', () => {
     beforeEach(() => {
+        setActivePinia(createPinia());
         vi.mocked(billingApi.getWallet).mockResolvedValue(makeWallet());
     });
 
     const factory = () =>
         mount(BillingView, {
             global: {
-                plugins: [vuetify],
+                plugins: [vuetify, createPinia()],
                 stubs: { TransactionsTable: true, InvoicesTable: true, ChargesTab: true, TopupDialog: true },
             },
         });
diff --git a/app/tests/Frontend/NewProjectDialog.spec.ts b/app/tests/Frontend/NewProjectDialog.spec.ts
index 835e3b7f..7629d475 100644
--- a/app/tests/Frontend/NewProjectDialog.spec.ts
+++ b/app/tests/Frontend/NewProjectDialog.spec.ts
@@ -104,4 +104,42 @@ describe('NewProjectDialog', () => {
         await flushPromises();
         expect(apiClient.post).toHaveBeenCalledWith('/api/projects', expect.objectContaining({ regions: [82, 83] }));
     });
+
+    it('409 balance_insufficient → открывает диалог перегрузки; save-blocked пере-сабмитит с force_save_blocked', async () => {
+        // Spec C §6.2 (Task 1.10): первый POST падает 409, второй (после выбора
+        // «Сохранить и приостановить») уходит с force_save_blocked=true.
+        (apiClient.post as ReturnType<typeof vi.fn>).mockRejectedValueOnce({
+            response: {
+                status: 409,
+                data: {
+                    error: 'balance_insufficient',
+                    current_balance_rub: '1000.00',
+                    current_capacity_leads: 30,
+                    would_be_required_leads: 50,
+                    deficit_leads: 20,
+                },
+            },
+        });
+
+        const wrapper = factory();
+        await flushPromises();
+        // Проходим гейт обязательного региона через подтверждённую «Вся РФ».
+        (wrapper.vm as unknown as { confirmVsyaRf: () => void }).confirmVsyaRf();
+        await (wrapper.vm as unknown as { submit: () => Promise<void> }).submit();
+        await flushPromises();
+
+        const overload = wrapper.find('[data-testid="overload-dialog"]');
+        expect(overload.exists()).toBe(true);
+        expect(overload.text()).toContain('20');
+
+        await wrapper.find('[data-testid="overload-save-blocked"]').trigger('click');
+        await flushPromises();
+
+        expect(apiClient.post).toHaveBeenCalledTimes(2);
+        expect(apiClient.post).toHaveBeenLastCalledWith(
+            '/api/projects',
+            expect.objectContaining({ force_save_blocked: true }),
+        );
+        expect(wrapper.emitted('saved')).toBeTruthy();
+    });
 });
diff --git a/app/tests/Frontend/ProjectLimitOverloadDialog.spec.ts b/app/tests/Frontend/ProjectLimitOverloadDialog.spec.ts
new file mode 100644
index 00000000..a6e5033d
--- /dev/null
+++ b/app/tests/Frontend/ProjectLimitOverloadDialog.spec.ts
@@ -0,0 +1,60 @@
+import { describe, it, expect } from 'vitest';
+import { mount } from '@vue/test-utils';
+import { createVuetify } from 'vuetify';
+import ProjectLimitOverloadDialog from '../../resources/js/components/projects/ProjectLimitOverloadDialog.vue';
+
+// Billing v2 Spec C Task 1.10 — диалог перегрузки лимита (§6.2). Принимает
+// 409-payload `balance_insufficient`, эмитит решение пользователя.
+
+const payload = {
+    current_balance_rub: '1000.00',
+    current_capacity_leads: 30,
+    would_be_required_leads: 50,
+    deficit_leads: 20,
+};
+
+const mountDialog = () =>
+    mount(ProjectLimitOverloadDialog, {
+        props: { modelValue: true, payload },
+        global: {
+            plugins: [createVuetify()],
+            stubs: { VDialog: { template: '<div><slot /></div>' } },
+        },
+    });
+
+describe('ProjectLimitOverloadDialog', () => {
+    it('рендерит данные 409-payload', () => {
+        const w = mountDialog();
+        const text = w.text();
+        expect(text).toContain('1000.00');
+        expect(text).toContain('30');
+        expect(text).toContain('50');
+        expect(text).toContain('20');
+    });
+
+    it('«Сохранить и приостановить» эмитит save-blocked', async () => {
+        const w = mountDialog();
+        await w.find('[data-testid="overload-save-blocked"]').trigger('click');
+        expect(w.emitted('save-blocked')).toBeTruthy();
+    });
+
+    it('«Поставить лимит 0» эмитит set-zero', async () => {
+        const w = mountDialog();
+        await w.find('[data-testid="overload-set-zero"]').trigger('click');
+        expect(w.emitted('set-zero')).toBeTruthy();
+    });
+
+    it('«Отмена» закрывает диалог (update:modelValue=false)', async () => {
+        const w = mountDialog();
+        await w.find('[data-testid="overload-cancel"]').trigger('click');
+        expect(w.emitted('update:modelValue')?.[0]).toEqual([false]);
+    });
+
+    it('payload=null — без падения, ничего не рендерит', () => {
+        const w = mount(ProjectLimitOverloadDialog, {
+            props: { modelValue: true, payload: null },
+            global: { plugins: [createVuetify()], stubs: { VDialog: { template: '<div><slot /></div>' } } },
+        });
+        expect(w.find('[data-testid="overload-save-blocked"]').exists()).toBe(false);
+    });
+});