Additional payments may be made on installment plans. However, that’s only possible if your account has a zero balance (excluding installments due). Is your statement paid in full?
Pay extra
To pay extra on your Apple Card Monthly Installments, you need to first pay your entire Apple Card balance. Then, to make an additional payment towards your installment balance, choose Pay Early. If you have multiple installments, your additional payment is applied to the outstanding balance of your oldest installment plan.
To Pay Early:
- Open the Wallet app and tap Apple Card.
- Tap the More button , then tap Monthly Installments. If you have multiple monthly installments, you see the balance for all of your monthly installments.
- Tap Pay Early, then tap Continue.
- Choose an amount to pay, then tap Pay Now or Pay later and follow the instructions on your screen.
How to view and pay Apple Card Monthly Installments - Apple Support