Late Payment Interest Calculator

The late payment interest calculator on this page to help small businesses work out the interest amount on their unpaid invoices so they know if they are eligible for a penalty payment.

Late Payment Interest Calculator

The interest rate can be found on the Office of State Revenue's website. Use the Total rate of interest.

Invoices for small businesses are to be paid 30 days from receipt of the invoice at a NSW government agency or a department's prescribed location. The 30 days are not calculated from the invoice date.

Enter the amount displayed on the invoice.