diff --git a/src/app/app-settings.spec.ts b/src/app/app-settings.spec.ts
index a647928..80dbcfe 100644
--- a/src/app/app-settings.spec.ts
+++ b/src/app/app-settings.spec.ts
@@ -62,6 +62,7 @@ describe('Application Settings', () => {
 	afterEach(() => {
 		fixture?.destroy();
 		vi.restoreAllMocks();
+		vi.useRealTimers();
 		localStorage.clear();
 		document.body.classList.remove('light-mode', 'dark-mode');
 	});
@@ -105,6 +106,111 @@ describe('Application Settings', () => {
 		await createApp();
 	}
 
+	it('keeps random starting balances unsaved through calculation and restores the first edited list', async () => {
+		vi.useFakeTimers({ toFake: ['Date'] });
+		vi.setSystemTime(new Date(2026, 9, 4, 12));
+		const random = vi
+			.spyOn(Math, 'random')
+			.mockReturnValueOnce(0)
+			.mockReturnValueOnce(0.5)
+			.mockReturnValue(1 - Number.EPSILON);
+		localStorage.removeItem('leaveBalances');
+		await revisitApp(true);
+
+		const root = fixture.nativeElement as HTMLElement;
+		expect(
+			Array.from(root.querySelectorAll<HTMLInputElement>('app-day-input input')).map(
+				(input) => input.value,
+			),
+		).toEqual([
+			'10',
+			'04/10/2026',
+			'04/10/2027',
+			'15',
+			'04/10/2026',
+			'04/10/2027',
+			'20',
+			'04/10/2026',
+			'04/10/2027',
+		]);
+		const types = await loader.getAllHarnesses(
+			MatSelectHarness.with({ selector: 'app-day-input mat-select' }),
+		);
+		expect(await Promise.all(types.map((type) => type.getValueText()))).toEqual([
+			'Paid Leave',
+			'RTT',
+			'Other',
+		]);
+		expect(calculate).toHaveBeenCalledOnce();
+		const initialRequest = calculate.mock.calls[0][0];
+		expect(initialRequest.balances.map((balance) => balance.quantity)).toEqual([10, 15, 20]);
+		expect(calculatePlanningInternal(initialRequest).kind).toBe('Plan');
+		await expect.poll(() => root.querySelector('.planning-status')).not.toBeNull();
+		expect(localStorage.getItem('leaveBalances')).toBeNull();
+
+		root.querySelector<HTMLButtonElement>('.calculate-button')!.click();
+		await fixture.whenStable();
+		expect(calculate).toHaveBeenCalledTimes(2);
+		expect(calculate.mock.calls[1][0].balances).toEqual(initialRequest.balances);
+		await expect.poll(() => root.querySelector('.planning-status')).not.toBeNull();
+		expect(localStorage.getItem('leaveBalances')).toBeNull();
+
+		const quantity = root.querySelector<HTMLInputElement>(
+			'app-day-input input[type="number"]',
+		)!;
+		quantity.value = '7';
+		quantity.dispatchEvent(new Event('input'));
+		await fixture.whenStable();
+		const saved = localStorage.getItem('leaveBalances');
+		expect(JSON.parse(saved!)).toMatchObject([
+			{ type: 'cp', numberOfDays: 7, availableDate: '2026-10-04', expiryDate: '2027-10-04' },
+			{
+				type: 'rtt',
+				numberOfDays: 15,
+				availableDate: '2026-10-04',
+				expiryDate: '2027-10-04',
+			},
+			{
+				type: 'other',
+				numberOfDays: 20,
+				availableDate: '2026-10-04',
+				expiryDate: '2027-10-04',
+			},
+		]);
+
+		random.mockReturnValue(0);
+		await revisitApp(true);
+		expect(
+			Array.from(
+				fixture.nativeElement.querySelectorAll('app-day-input input[type="number"]'),
+				(input) => (input as HTMLInputElement).value,
+			),
+		).toEqual(['7', '15', '20']);
+		expect(calculate).toHaveBeenCalledOnce();
+		expect(calculate.mock.calls[0][0].balances).toEqual(
+			initialRequest.balances.map((balance, index) =>
+				index === 0 ? { ...balance, quantity: 7 } : balance,
+			),
+		);
+		expect(localStorage.getItem('leaveBalances')).toBe(saved);
+	});
+
+	it('calculates with a saved empty balance list without generating replacement rows', async () => {
+		localStorage.setItem('leaveBalances', '[]');
+		const random = vi.spyOn(Math, 'random');
+		await revisitApp(true);
+
+		expect(fixture.nativeElement.querySelector('app-day-input')).toBeNull();
+		expect(calculate).toHaveBeenCalledOnce();
+		expect(calculate.mock.calls[0][0].balances).toEqual([]);
+		expect(calculatePlanningInternal(calculate.mock.calls[0][0]).kind).toBe('Plan');
+		await expect
+			.poll(() => fixture.nativeElement.querySelector('.planning-status'))
+			.not.toBeNull();
+		expect(random).not.toHaveBeenCalled();
+		expect(localStorage.getItem('leaveBalances')).toBe('[]');
+	});
+
 	it('passes restored expired balances to the initial calculation without rewriting storage', () => {
 		const root = fixture.nativeElement as HTMLElement;
 		expect(