My loan payment is past due. How can I make my payment? You can make a loan payment in several ways to bring your loan account out of past-due status. Make your payment by: Log into Alliant online banking, select “Make a Payment” and follow the prompts to make your payment. Make a one-time payment of up to $1,000 via the Alliant Express Payment Web Portal. Call 800-328-1935 to speak to a Member Service Consultant who can help you make your payment.