Mortgage Rate Float-Down Provisions: How They Work, Which Lenders Offer Them, and When They Make Sense

A rate float-down is an option that allows a borrower who has locked a rate to take advantage of a rate decrease during the lock period without starting the lock over. It is not a free option; it typically comes with a cost and a minimum rate improvement threshold. In volatile rate environments, borrowers ask about float-down provisions frequently, and MLOs who understand the mechanics can give concrete answers instead of vague reassurances.

How a Float-Down Works

A float-down provision allows the borrower to reset their locked rate to the current market rate (or a defined portion of the improvement) if rates drop below a specified threshold after the initial lock. Most float-down options require rates to drop by at least 0.25-0.375% from the locked rate before the option can be exercised. The reset rate is typically the current market rate minus a float-down spread (e.g., the borrower gets the market rate less 0.125%). The option can usually only be exercised once during the lock period, within a specified window before closing.

Float-Down Fee Structure

• ✦Float-down options typically cost 0.125 to 0.375% of the loan amount upfront as an option fee
• ✦Some lenders price the float-down into the initial locked rate (slightly higher rate at lock vs. a lock without the float-down option)
• ✦Free float-down programs exist but typically have more restrictive trigger thresholds or smaller improvement windows
• ✦If rates do not drop enough to trigger the float-down, the option expires worthless; the fee is not refunded

When a Float-Down Makes Sense

A float-down makes sense when: the borrower is 45-60 days from closing, rates are historically elevated and market participants expect near-term improvement, and the float-down cost is less than the break-even on a one-eighth point rate improvement over a reasonable holding period. For a $500,000 loan, a 0.125% rate improvement saves approximately $40 per month. A float-down fee of $625 (0.125% of loan) breaks even in approximately 15 months. If the borrower plans to hold the loan more than 15 months, the float-down is worth the cost if there is a reasonable probability of a 0.125% market improvement before closing.