Freddie Index Lock allows the sponsor to lock the underlying Treasury index (the risk-free rate component of the loan's pricing) early in the application process, sometimes as early as application acceptance. The MBS spread and any program-specific add-ons remain market-determined until full rate lock . Useful in rising-rate environments to reduce Treasury exposure during the underwriting and closing window.
How Index Lock changes the rate-lock execution
Standard agency rate lock: the entire rate (Treasury plus MBS spread plus g-fee plus servicer spread) locks at a single point in time, typically late in the closing process. Borrower bears Treasury and MBS-spread risk between application and rate lock.
Index Lock: the Treasury portion locks early, sometimes at application, while the MBS spread and add-ons remain market-determined until full rate lock. Borrower bears MBS spread risk but eliminates Treasury rate risk during the underwriting and closing window.
When useful: rising-rate environments where the sponsor's view is that Treasuries will move higher during the closing window. Locking the Treasury early eliminates the largest variable; the remaining MBS spread risk is typically smaller than the Treasury volatility risk.
Cost: typically a small premium over the standard rate lock, paid as either a spread adjustment or a small upfront fee. The premium is the cost of optionality.
Practical sponsor planning: track the Treasury rate movement during the closing window. If Treasuries move 25 bps in the borrower's favor between application and full rate lock, the Index Lock effectively cost the sponsor that movement; if Treasuries move 25 bps against the borrower, the Index Lock saved the equivalent.
Sources
- Optigo lending program disclosures · Freddie Mac Multifamily · current
- Multifamily Research and Outlook · Freddie Mac Multifamily · 2026-Q1
- Daily Treasury Par Yield Curve Rates · U.S. Department of the Treasury · daily