Iowa Code
Chapter 535B - MORTGAGE BANKERS, MORTGAGE BROKERS, AND CLOSING AGENTS
Section 535B.12 - Payment processing.

535B.12 Payment processing.
A licensee or other mortgagee shall not assess a late charge if full payment is received before the date late charges are authorized in the mortgage documents and shall post all periodic payments in full within two business days of receipt.
88 Acts, ch 1146, §12
Referred to in §535B.2, 535B.10