Rates & InterestLetter Y

Yield Maintenance Prepayment Defeasance

A commercial mortgage prepayment provision designed to make the lender financially whole for lost interest spread if a loan is paid off when current U.S. Treasury yields are lower than the original note rate.

Overview & Practical Application

Yield Maintenance is a present-value prepayment penalty clause standard in institutional commercial real estate (CRE) mortgages, CMBS (Commercial Mortgage-Backed Securities) conduit loans, and Fannie Mae / Freddie Mac multifamily apartment loans.

Unlike a simple fixed percentage Step-Down Prepayment Penalty (such as 3-2-1), Yield Maintenance is dynamically linked to the U.S. Treasury bond yield matching the remaining maturity of the loan: - It ensures that if interest rates fall and the borrower pays off the loan early, the lender receives a lump-sum payment equal to the Present Value of the lost interest rate spread between the loan's contracted Note Rate and the current replacement U.S. Treasury rate over the remaining loan term. - Rate Environment Sensitivity: When market Treasury yields have *dropped* far below the loan's note rate, the Yield Maintenance penalty is large; when current Treasury yields have *risen* above the loan's note rate, the formula typically floors at a minimum 1.00% par penalty.

Mathematical Formula & Calculation

Yield Maintenance Penalty = Present Value of Remaining Payments * (Contract Note Rate - Current Treasury Yield)

Discounts the remaining scheduled interest differential at the current U.S. Treasury yield matching the loan’s maturity date.

Variable Definitions:

  • Contract Note Rate=Original fixed interest rate on the commercial mortgage
  • Current Treasury Yield=Yield on the U.S. Treasury security with a maturity matching the loan’s remaining term

Real-World Underwriting Example

Scenario: A commercial borrower has $2,000,000 remaining on a 10-year loan at a 6.25% note rate with 4 years left until maturity. Current 4-Year U.S. Treasury yields are 4.25% (a 2.00% annual spread).

Calculation:
Annual Interest Spread = 6.25% - 4.25% = 2.00% (~$40,000/yr over 4 years).
Discounted Present Value factor (~3.60x) * $40,000 = ~$144,000.

Takeaway: The borrower must pay an estimated $144,000 Yield Maintenance penalty to make the bondholders whole for the 2.00% rate drop over the remaining 4 years.

Key Underwriting Takeaways

  • Found exclusively in commercial, multifamily, and CMBS loans — never in consumer residential mortgages.
  • Closely related to "Defeasance", where instead of paying a cash penalty to pay off the loan, the borrower substitutes a portfolio of U.S. Treasury bonds that generate the exact remaining loan payments.
  • Always request a formal Yield Maintenance payoff quote before listing a commercial property for sale.
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