NY state (USA) Maxium allowed % added on unpaid Bill?

Hi

I am trying to collect an unpaid, overdue bill from a former customer in NY state. Does anyone know if I can a % say monthly to a bill and what the maxium I can add? I was thingking about 1% per month.

thanks,
Bob Z

It is called a usury limit. This web page lists the usury limits for all 50 states. Standard disclaimers apply.