diff --git a/myteamwallet_backend/src/cashbox-export/cashbox-export.utils.spec.ts b/myteamwallet_backend/src/cashbox-export/cashbox-export.utils.spec.ts
index 54d32a0..bd7b207 100644
--- a/myteamwallet_backend/src/cashbox-export/cashbox-export.utils.spec.ts
+++ b/myteamwallet_backend/src/cashbox-export/cashbox-export.utils.spec.ts
@@ -155,4 +155,15 @@ describe('buildCsv', () => {
         '2026-08-05;Zahlung;Alex Muster;Test;1,01;1,01',
     );
   });
+
+  it('rounds negative half-cent boundaries correctly', () => {
+    const csv = buildCsv([
+      { date: '2026-08-05T00:00:00.000Z', type: 'expense', who: 'Teamkasse', note: 'Test', amount: -1.005, runningTotal: -1.005 },
+    ]);
+
+    expect(csv).toBe(
+      'Datum;Typ;Wer;Notiz;Betrag;Periodensaldo\r\n' +
+        '2026-08-05;Ausgabe;Teamkasse;Test;-1,01;-1,01',
+    );
+  });
 });
diff --git a/myteamwallet_backend/src/cashbox-export/cashbox-export.utils.ts b/myteamwallet_backend/src/cashbox-export/cashbox-export.utils.ts
index f8ef725..96ad9df 100644
--- a/myteamwallet_backend/src/cashbox-export/cashbox-export.utils.ts
+++ b/myteamwallet_backend/src/cashbox-export/cashbox-export.utils.ts
@@ -68,7 +68,7 @@ const TYPE_LABELS: Record<string, string> = {
 };
 
 function formatGermanAmount(value: number): string {
-  const rounded = Math.round((value + Number.EPSILON) * 100) / 100;
+  const rounded = Math.sign(value) * Math.round((Math.abs(value) + Number.EPSILON) * 100) / 100;
   const normalized = rounded === 0 ? 0 : rounded;
   return normalized.toFixed(2).replace('.', ',');
 }