Float-Down Option 2026: How Rate Lock Float-Downs Work and When They Make Sense

A float-down is an optional rate lock feature that allows the borrower to receive a lower rate if prevailing market rates fall below the locked rate by a specified threshold before closing. It is not a standard lock feature; it is an add-on offered by some lenders for a fee or as a component of a slightly higher starting rate.

How Float-Downs Are Structured

Each lender sets its own float-down terms. Common structure: the borrower locks at today's market rate. If rates drop by at least the specified trigger amount (commonly 0.25% to 0.375%), the borrower may exercise the float-down and receive the new, lower rate. Most lenders allow one exercise of the float-down. If rates fall but not by the required threshold, the locked rate holds.

What It Costs

Float-down options are priced in one of two ways: an upfront fee of approximately 0.25% to 0.50% of the loan amount, or a slightly higher locked rate (the lender builds the cost into the rate spread). On a $400,000 loan, an upfront float-down fee at 0.25% is $1,000. Compare this to the value of a rate drop: a 0.25% rate reduction on a $400,000 30-year loan saves roughly $60 per month, breaking even in under 18 months.

When a Float-Down Makes Sense

Float-downs are most useful in volatile rate environments where meaningful improvement is possible before closing. For purchase loans with 45-to-60-day timelines, and when rates have recently spiked and may correct, the float-down provides upside participation without giving up the locked floor. For a borrower who is price-sensitive and the lock timeline is short (under 30 days), the float-down fee likely outweighs its value.

Float-Down vs Floating the Rate

A float-down is different from floating (not locking at all). Floating means the borrower has no locked rate and takes full market exposure in both directions. A float-down locks the rate with a floor, then provides limited participation in rate improvement. Floating is rarely appropriate for purchase transactions where the borrower needs rate certainty for closing cost planning.