Can I use my retainer to pay for my last invoice? We do not allow retainers to be used to pay monthly invoices. Updated on July 21, 2020 Tagged: paydepositretainer Was this article helpful? Yes No Related Articles How do I change my payment method? How do I avoid late payment fees? How can I see my full payment history? What payment options are available to me? How and when will a retainer/deposit top up be charged? When do I get my retainer/deposit back?