Not a Clio customer? Learn more about Clio's Law Firm Billing Software When a Payment Is Applied to a Bill with Interest, What Percentage of the Payment Will Go Towards the Interest? April 18, 2021 03:54 Question: How much percentage of the interest is paid on a Bill? How much interest will be paid against, on a Bill payment? Environment: Clio Manage Additional Information: n/a Answer: When a payment is made on a Bill that also has interest, the payment will first be applied to the original bill amount, and then to the interest.