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You can also look at the Savings and Loan Act of 1963. See NJSA 17:12B-48(13). We have interpreted this section to permit a late charge of 4% of the total payment amount. On a residential mortgage loan, we assess 4% of the principal, interest, and escrow payment as long as the loan has not been sold to Fannie Mae or Freddie Mac. If the loan is sold to them, then the late charge is 5% of the principal and interest payment. We provide for a 10 day grace period on non-real estate secured consumer loans and a 15 day grace period on real estate secured loans. We switched to the 15 day grace period on real estate secured loans when we changed charters from a state-chartered S & L to a federal S& L. See 12 CFR 560.33 for the OTS regulation on late charges for federal thrifts.