815 ILCS 180/20: Coupon books.

If any form of amortization is used by the creditor and a coupon book was sent to the debtor at the inception of the credit transaction, the creditor shall send to the debtor either:

(1) a reprinted coupon book with revised calculations of the debtor's payments that includes the amortized costs of the collateral protection insurance; or

(2) a supplemental coupon book with calculations of the debtor's additional payments based upon the amortized costs of the collateral protection insurance, for use by the debtor in addition to the original coupon book.