It is lawful to receive or to contract to receive and collect interest and charges as authorized by the Interest Act, the Consumer Installment Loan Act, the Retail Installment Sales Act, the Motor Vehicle Retail Installment Sales Act, the Payday Loan Reform Act, and the Illinois Financial Services Development Act.
In any case in which interest is received, contracted for, or collected on the basis of paragraph (i) of subsection (a) of Section 4a, the debtor may satisfy in full at any time before maturity the debt evidenced by the written instrument, and in so satisfying must receive a refund credit against the total amount of interest added to the principal computed in the manner provided under paragraph (3) of subsection (f) of Section 15 of the Consumer Installment Loan Act for refunds or credits of applicable interest on payment in full of precomputed loans before the final installment due date.
The terms "finance charge" and "annual percentage rate" shall be printed more conspicuously than other terminology required by this Section.
The amount of the finance charge shall be determined as the sum of all charges, payable directly or indirectly by the obligor and imposed directly or indirectly by the lender as an incident to or as a condition to the extension of credit, whether paid or payable by the obligor, any other person on behalf of the obligor, to the lender or to a third party, including any of the following types of charges:
A late payment, delinquency, default, reinstatement or other such charge is not a finance charge if imposed for actual unanticipated late payment, delinquency, default or other occurrence.
815 ILCS 205/4a