Fla. Stat. § 559.9237
A rental-purchase agreement may provide for payment by the lessee of a charge for failure to make a timely rental renewal payment, which charge may not exceed $5 on any payment made after either payment is due or after the return of the rental property is required. A charge pursuant to a rental-purchase agreement for a lessee's failure to make a timely rental renewal payment may be collected only once on any accrued payment, no matter how long it remains unpaid. Such a charge may be collected at the time it accrues or any time thereafter. Such a charge may not be assessed against a payment that is timely made, even though an earlier charge has not been paid in full. A rental-purchase agreement may provide for the payment of reasonable attorney's fees incurred by an attorney, not a salaried employee of the lessor, in the course of collection, and for the payment of court costs.
Fla. Stat. § 559.9237