Is there a max to a late charge percentage?

[szlamany]

What is the name of your state (only U.S. law)? CT

Can a business charge 10% every month for a balance that's owed?

Can they back up to prior months - that you have invoices without late charges from them - and put late charges on those months also?

 

[seniorjudge]

All the answers to your questions would depend on the written agreement between the debtor and creditor.