diff --git a/frontend/e2e/create-invoice.spec.ts b/frontend/e2e/create-invoice.spec.ts
index 42522b7..200ce1b 100644
--- a/frontend/e2e/create-invoice.spec.ts
+++ b/frontend/e2e/create-invoice.spec.ts
@@ -37,6 +37,20 @@ test('a new item starts with a blank price, not a literal 0', async ({ page }) =
   await expect(page.locator('[id^="item-price-"]:visible')).toHaveValue('');
 });
 
+test('clearing the quantity field leaves it empty, not stuck on 0', async ({ page }) => {
+  await page.goto('/');
+
+  await page.getByRole('button', { name: 'New Invoice' }).click();
+  await visibleButton(page, '+ Add New Item').click();
+
+  const qty = page.locator('[id^="item-qty-"]:visible');
+  await expect(qty).toHaveValue('1');
+
+  await qty.fill('');
+
+  await expect(qty).toHaveValue('');
+});
+
 test('shows the save error inside the still-open drawer, not on the page', async ({ page }) => {
   await page.goto('/');
 
diff --git a/frontend/src/features/invoices/components/invoice-form-drawer/invoice-form-drawer.tsx b/frontend/src/features/invoices/components/invoice-form-drawer/invoice-form-drawer.tsx
index 8ddd46e..0401373 100644
--- a/frontend/src/features/invoices/components/invoice-form-drawer/invoice-form-drawer.tsx
+++ b/frontend/src/features/invoices/components/invoice-form-drawer/invoice-form-drawer.tsx
@@ -373,7 +373,12 @@ const InvoiceFormDrawer = (props: IInvoiceFormDrawerProps): JSX.Element => {
                       id={`item-qty-${index}`}
                       min={0}
                       type="number"
-                      value={item.quantity}
+                      // Backspacing to empty fires onChange with '', and
+                      // Number('') is 0, not NaN, so without this the
+                      // controlled value snaps straight back to a literal
+                      // "0" and the field never visibly clears. Same fix
+                      // already used for price, below.
+                      value={item.quantity || ''}
                       // appearance-none drops the spinner in Firefox and
                       // current Chrome/Safari; the two arbitrary-variant
                       // rules clear WebKit's older spin-button pseudo