diff --git a/app/Services/PressRelease/BoostService.php b/app/Services/PressRelease/BoostService.php
index a2d4d4f8..4bb96bd9 100644
--- a/app/Services/PressRelease/BoostService.php
+++ b/app/Services/PressRelease/BoostService.php
@@ -2,6 +2,7 @@
 
 namespace App\Services\PressRelease;
 
+use App\Enums\Portal;
 use App\Enums\PressReleaseClassification;
 use App\Enums\PressReleaseStatus;
 use App\Exceptions\BoostNotAllowedException;
@@ -11,6 +12,7 @@ use App\Models\User;
 use App\Services\Billing\CreditPricingService;
 use App\Services\Billing\CreditWalletService;
 use Illuminate\Support\Carbon;
+use Illuminate\Support\Facades\Cache;
 use Illuminate\Support\Facades\DB;
 
 /**
@@ -63,7 +65,7 @@ class BoostService
 
         $credits = $this->pricing->boostCredits($days);
 
-        return DB::transaction(function () use ($user, $pressRelease, $days, $credits): Boost {
+        $boost = DB::transaction(function () use ($user, $pressRelease, $days, $credits): Boost {
             $startsAt = $this->activeUntil($pressRelease) ?? now();
 
             $boost = $pressRelease->boosts()->create([
@@ -83,5 +85,39 @@ class BoostService
 
             return $boost;
         });
+
+        $this->forgetPlacementCaches($pressRelease);
+
+        return $boost;
+    }
+
+    /**
+     * Gecachte Start-/Branchenseiten der betroffenen Ausgaben verwerfen,
+     * damit die bezahlte Platzierung sofort sichtbar wird statt erst nach
+     * Ablauf der Cache-TTL (HomePageData/CategoryPageData, 300 s).
+     */
+    private function forgetPlacementCaches(PressRelease $pressRelease): void
+    {
+        $portals = $pressRelease->portal === Portal::Both
+            ? [Portal::Presseecho->value, Portal::Businessportal24->value]
+            : [$pressRelease->portal->value];
+
+        // Branchenseite der eigenen Rubrik plus Eltern-Rubrik (deren Seite
+        // schließt Unterkategorien mit ein), je hinterlegter Sprache.
+        $category = $pressRelease->category()
+            ->with(['translations', 'parent.translations'])
+            ->first();
+        $translations = collect($category?->translations ?? [])
+            ->merge($category?->parent?->translations ?? []);
+
+        foreach ($portals as $portal) {
+            Cache::forget(sprintf('web.home.%s.%s', $portal, $pressRelease->language));
+
+            foreach ($translations as $translation) {
+                if (filled($translation->slug)) {
+                    Cache::forget(sprintf('web.category.%s.%s.%s', $portal, $translation->locale, $translation->slug));
+                }
+            }
+        }
     }
 }
diff --git a/tests/Feature/Web/BoostPlacementTest.php b/tests/Feature/Web/BoostPlacementTest.php
index 3f9162d5..90087741 100644
--- a/tests/Feature/Web/BoostPlacementTest.php
+++ b/tests/Feature/Web/BoostPlacementTest.php
@@ -1,10 +1,14 @@
 <?php
 
 use App\Enums\Portal;
+use App\Enums\PressReleaseClassification;
 use App\Models\Boost;
 use App\Models\Category;
 use App\Models\Company;
 use App\Models\PressRelease;
+use App\Models\User;
+use App\Services\Billing\CreditWalletService;
+use App\Services\PressRelease\BoostService;
 use App\Services\Web\HomePageData;
 use Tests\TestCase;
 
@@ -44,6 +48,8 @@ function boostPlacementFixture(): array
             'title' => 'Geboostete aeltere Meldung',
             'slug' => 'geboostete-aeltere-meldung',
             'published_at' => now()->subDays(5),
+            // Grün klassifiziert: Voraussetzung fürs Boost-Gate im BoostService.
+            'classification' => PressReleaseClassification::Green->value,
         ]);
 
     return compact('category', 'company', 'newest', 'boosted');
@@ -82,6 +88,28 @@ test('an expired boost does not influence the homepage placement', function () {
         ->assertDontSeeText('Top-Platzierung');
 });
 
+test('booking a boost invalidates the cached start and category pages immediately', function () {
+    /** @var TestCase $this */
+    ['boosted' => $boosted, 'newest' => $newest] = boostPlacementFixture();
+
+    $owner = User::factory()->create(['is_active' => true]);
+    app(CreditWalletService::class)->credit($owner, 40);
+
+    // Beide Seiten in den Cache legen — noch ohne Boost.
+    expect(app(HomePageData::class)->build(Portal::Presseecho)['leadRelease']->id)->toBe($newest->id);
+    $this->get('https://presseecho.test/de/category/energie-klima')
+        ->assertSuccessful()
+        ->assertDontSeeText('Top-Platzierung');
+
+    app(BoostService::class)->boost($owner, $boosted, 7);
+
+    // Kein Warten auf die TTL: die Buchung verwirft die gecachten Seiten.
+    expect(app(HomePageData::class)->build(Portal::Presseecho)['leadRelease']->id)->toBe($boosted->id);
+    $this->get('https://presseecho.test/de/category/energie-klima')
+        ->assertSuccessful()
+        ->assertSeeText('Top-Platzierung');
+});
+
 test('a boosted release leads its category page and is labelled', function () {
     /** @var TestCase $this */
     ['boosted' => $boosted] = boostPlacementFixture();