diff --git a/app/resources/js/components/advertising/CampaignWizard.vue b/app/resources/js/components/advertising/CampaignWizard.vue
index 9b938cc3..4d5ec700 100644
--- a/app/resources/js/components/advertising/CampaignWizard.vue
+++ b/app/resources/js/components/advertising/CampaignWizard.vue
@@ -21,6 +21,7 @@
 import { reactive, ref, computed, watch, onMounted } from 'vue';
 import {
     createCampaign,
+    patchCampaign,
     fetchAudienceSize,
     type CampaignCreate,
     type AudienceSize,
@@ -118,11 +119,50 @@ function removeAd(index: number): void {
     form.ads.splice(index, 1);
 }
 
+const budgetError = ref<string | null>(null);
+const budgetSaving = ref(false);
+
 function goBack(): void {
     step.value = Math.max(1, step.value - 1);
 }
 
-function goNext(): void {
+/**
+ * Уходя с шага 3 «Бюджет» — сохраняем черновик (Р37: фронт денег не считает,
+ * передаёт строки как ввёл пользователь). Пустой недельный бюджет блокирует
+ * переход; ошибка PATCH — тоже блокирует, введённое не теряется (форма не чистится).
+ */
+async function saveBudgetStep(): Promise<boolean> {
+    if (!form.weekly_budget_rub || form.weekly_budget_rub.trim() === '') {
+        budgetError.value = 'Укажите бюджет в неделю.';
+        return false;
+    }
+    if (draftId.value === null) {
+        budgetError.value = 'Черновик кампании ещё не создан.';
+        return false;
+    }
+    budgetError.value = null;
+    budgetSaving.value = true;
+    try {
+        await patchCampaign(draftId.value, {
+            weekly_budget_rub: form.weekly_budget_rub,
+            daily_budget_rub: form.daily_budget_rub || null,
+            audience_days: form.audience_days,
+            use_uploaded_list: form.use_uploaded_list,
+        });
+        return true;
+    } catch (e) {
+        budgetError.value = extractErrorMessage(e, 'Не удалось сохранить бюджет.');
+        return false;
+    } finally {
+        budgetSaving.value = false;
+    }
+}
+
+async function goNext(): Promise<void> {
+    if (step.value === 3) {
+        const saved = await saveBudgetStep();
+        if (!saved) return;
+    }
     step.value = Math.min(stepTitles.length, step.value + 1);
 }
 
@@ -138,7 +178,7 @@ onMounted(() => {
     void createDraft();
 });
 
-defineExpose({ form, draftId, audienceSize, canLaunch, refreshAudienceSize });
+defineExpose({ form, draftId, audienceSize, canLaunch, refreshAudienceSize, budgetError });
 </script>
 
 <template>
@@ -239,7 +279,40 @@ defineExpose({ form, draftId, audienceSize, canLaunch, refreshAudienceSize });
                 </div>
 
                 <div v-else-if="stepValue(itemSlot) === 3" class="pa-4" data-testid="wizard-step-3">
-                    <p class="text-body-2 text-medium-emphasis">— скоро —</p>
+                    <h2 class="text-subtitle-1 font-weight-medium mb-1">Бюджет</h2>
+                    <p class="text-body-2 text-medium-emphasis mb-4">
+                        Столько максимум спишется за неделю. Платите только за переходы по объявлению.
+                    </p>
+
+                    <p v-if="audienceSize" class="text-body-2 mb-4" data-testid="budget-audience-note">
+                        Ваша аудитория: ~{{ audienceSize.size }} человек
+                    </p>
+
+                    <v-text-field
+                        v-model="form.weekly_budget_rub"
+                        type="number"
+                        label="Бюджет в неделю"
+                        suffix="₽"
+                        variant="outlined"
+                        density="comfortable"
+                        class="mb-2"
+                        data-testid="budget-weekly"
+                    />
+
+                    <v-text-field
+                        v-model="form.daily_budget_rub"
+                        type="number"
+                        label="Бюджет в день (необязательно)"
+                        suffix="₽"
+                        variant="outlined"
+                        density="comfortable"
+                        class="mb-2"
+                        data-testid="budget-daily"
+                    />
+
+                    <p v-if="budgetError" class="text-body-2 text-error" data-testid="wizard-budget-error">
+                        {{ budgetError }}
+                    </p>
                 </div>
 
                 <div v-else-if="stepValue(itemSlot) === 4" class="pa-4" data-testid="wizard-step-4">
@@ -257,6 +330,7 @@ defineExpose({ form, draftId, audienceSize, canLaunch, refreshAudienceSize });
                         color="primary"
                         variant="flat"
                         :disabled="step === stepTitles.length"
+                        :loading="budgetSaving"
                         data-testid="wizard-next"
                         @click="goNext"
                     >
diff --git a/app/tests/Frontend/advertising-campaign-wizard.spec.ts b/app/tests/Frontend/advertising-campaign-wizard.spec.ts
index 3a4369f8..6eca7a52 100644
--- a/app/tests/Frontend/advertising-campaign-wizard.spec.ts
+++ b/app/tests/Frontend/advertising-campaign-wizard.spec.ts
@@ -2,18 +2,21 @@ import { describe, it, expect, vi, beforeEach } from 'vitest';
 import { mount } from '@vue/test-utils';
 import { createVuetify } from 'vuetify';
 
-const { createCampaignMock, fetchAudienceSizeMock, addCreativeMock, uploadCreativeImageMock } = vi.hoisted(() => ({
-    createCampaignMock: vi.fn(),
-    fetchAudienceSizeMock: vi.fn(),
-    // Не используются напрямую этими тестами — нужны CreativeForm.vue (шаг 2, B2-6),
-    // который смонтирован внутри мастера.
-    addCreativeMock: vi.fn(),
-    uploadCreativeImageMock: vi.fn(),
-}));
+const { createCampaignMock, fetchAudienceSizeMock, patchCampaignMock, addCreativeMock, uploadCreativeImageMock } =
+    vi.hoisted(() => ({
+        createCampaignMock: vi.fn(),
+        fetchAudienceSizeMock: vi.fn(),
+        patchCampaignMock: vi.fn(),
+        // Не используются напрямую этими тестами — нужны CreativeForm.vue (шаг 2, B2-6),
+        // который смонтирован внутри мастера.
+        addCreativeMock: vi.fn(),
+        uploadCreativeImageMock: vi.fn(),
+    }));
 
 vi.mock('../../resources/js/api/advertising', () => ({
     createCampaign: createCampaignMock,
     fetchAudienceSize: fetchAudienceSizeMock,
+    patchCampaign: patchCampaignMock,
     addCreative: addCreativeMock,
     uploadCreativeImage: uploadCreativeImageMock,
 }));
@@ -39,6 +42,7 @@ describe('CampaignWizard.vue (B2-5 — каркас v-stepper + шаг 1)', () =
     beforeEach(() => {
         createCampaignMock.mockReset();
         fetchAudienceSizeMock.mockReset();
+        patchCampaignMock.mockReset();
     });
 
     it('при монтировании создаёт черновик кампании один раз и показывает шаг 1', async () => {
@@ -120,3 +124,82 @@ describe('CampaignWizard.vue (B2-5 — каркас v-stepper + шаг 1)', () =
         expect(w.find('[data-testid="wizard-step-1"]').exists()).toBe(true);
     });
 });
+
+describe('CampaignWizard.vue (B2-7 — шаг 3 «Бюджет»)', () => {
+    beforeEach(() => {
+        createCampaignMock.mockReset();
+        fetchAudienceSizeMock.mockReset();
+        patchCampaignMock.mockReset();
+    });
+
+    /** Переходим на шаг 3 кликами «Далее» — так же, как реальный пользователь. */
+    async function gotoStep3(w: ReturnType<typeof mount>): Promise<void> {
+        await w.find('[data-testid="wizard-next"]').trigger('click');
+        await w.vm.$nextTick();
+        await w.find('[data-testid="wizard-next"]').trigger('click');
+        await w.vm.$nextTick();
+        expect(w.find('[data-testid="wizard-step-3"]').exists()).toBe(true);
+    }
+
+    it('ввод недельного бюджета и «Далее» на шаге 3 сохраняет черновик через patchCampaign', async () => {
+        createCampaignMock.mockResolvedValue(DRAFT_CAMPAIGN);
+        fetchAudienceSizeMock.mockResolvedValue({ size: 120, min: 100, enough: true, hint: null });
+        patchCampaignMock.mockResolvedValue({ ...DRAFT_CAMPAIGN, weekly_budget_rub: '2500.00' });
+
+        const w = mount(CampaignWizard, { global: { plugins: [vuetify] } });
+        await flush();
+        await w.vm.$nextTick();
+
+        await gotoStep3(w);
+
+        const weeklyInput = w.find('[data-testid="budget-weekly"] input');
+        await weeklyInput.setValue('2500');
+        await w.vm.$nextTick();
+
+        await w.find('[data-testid="wizard-next"]').trigger('click');
+        await flush();
+        await w.vm.$nextTick();
+
+        expect(patchCampaignMock).toHaveBeenCalledWith(99, expect.objectContaining({ weekly_budget_rub: '2500' }));
+        // Переход на шаг 4 подтверждает, что сохранение не упало.
+        expect(w.find('[data-testid="wizard-step-4"]').exists()).toBe(true);
+    });
+
+    it('пустой недельный бюджет блокирует «Далее» — patchCampaign не зовётся', async () => {
+        createCampaignMock.mockResolvedValue(DRAFT_CAMPAIGN);
+        fetchAudienceSizeMock.mockResolvedValue({ size: 120, min: 100, enough: true, hint: null });
+
+        const w = mount(CampaignWizard, { global: { plugins: [vuetify] } });
+        await flush();
+        await w.vm.$nextTick();
+
+        await gotoStep3(w);
+
+        const weeklyInput = w.find('[data-testid="budget-weekly"] input');
+        await weeklyInput.setValue('');
+        await w.vm.$nextTick();
+
+        await w.find('[data-testid="wizard-next"]').trigger('click');
+        await flush();
+        await w.vm.$nextTick();
+
+        expect(patchCampaignMock).not.toHaveBeenCalled();
+        expect(w.find('[data-testid="wizard-step-3"]').exists()).toBe(true);
+        expect(w.find('[data-testid="wizard-budget-error"]').exists()).toBe(true);
+    });
+
+    it('budget-audience-note показывает размер аудитории из счётчика мастера', async () => {
+        createCampaignMock.mockResolvedValue(DRAFT_CAMPAIGN);
+        fetchAudienceSizeMock.mockResolvedValue({ size: 340, min: 100, enough: true, hint: null });
+
+        const w = mount(CampaignWizard, { global: { plugins: [vuetify] } });
+        await flush();
+        await w.vm.$nextTick();
+
+        await gotoStep3(w);
+
+        const note = w.find('[data-testid="budget-audience-note"]');
+        expect(note.exists()).toBe(true);
+        expect(note.text()).toContain('340');
+    });
+});