Is there a limit to the amount we can charge for a renewal fee?

We have a loan officer who has charged a $75.00 renewal fee for a $600.00 single pay loan. I know there are limits to the amount you can charge the customer on $1,000.00 or less loans that has a maturity of 12 months or less at origination, but I didn't know if this also applied to renewal fees.

http://www.tennessee.gov/sos/rules/0180/0180-08.pdf

It would also depend under which statute your bank lends money. However, we lend under the Credit Card State Bank rules except for small, single-pay loans then we use the TILT rules. (We do not charge a renewal fee on small, single-pay loans.

I recommend a fee matrix chart, incorporating state and fed laws.