Glossary term
Float-Down Option
A float-down option lets a mortgage borrower lock a rate but potentially move to a lower rate if market rates fall before closing.
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What Is a Float-Down Option?
A float-down option is a mortgage rate-lock feature that may let a borrower move from a locked interest rate to a lower available rate if market rates fall before closing. It is a hybrid between locking and floating: the borrower gets some protection against rates rising, while retaining limited access to a better rate if conditions improve.
The word “may” matters. Float-down terms are set by the lender, and the feature is not automatic in every rate lock. Some lenders charge for it. Some require rates to fall by a minimum amount. Some allow only one float-down. Some limit when the borrower can use it, such as within a certain number of days before closing.
Key Takeaways
- A float-down option is tied to a mortgage rate lock.
- It can help if rates fall after the borrower locks.
- The lender’s written lock agreement controls the trigger, timing, cost, and eligible rate.
- Float-downs can reduce regret, but they do not guarantee the lowest possible market rate.
- Borrowers should compare the fee or rate cost with the realistic chance of using the feature.
How It Works
When a borrower locks a mortgage rate, the lender generally agrees that the rate will not change before closing if the loan closes within the lock period and the borrower’s application facts do not materially change. A float-down provision modifies that bargain by giving the borrower a defined opportunity to capture a lower rate if the lender’s conditions are met.
The details can be surprisingly specific. The float-down may be based on the lender’s current rate sheet, the same loan program, the same lock period, and the same points or pricing structure. A borrower who bought down the rate with points should ask whether the float-down compares market movement against the bought-down rate or the underlying par rate.
What To Read In the Lock Agreement
The lock agreement should answer several questions: Is the float-down included or purchased separately? How large must the market improvement be? Can it be used more than once? Who must request it? What is the deadline? Does it apply to all loan products? Does the lower rate affect points, credits, or closing costs?
Borrowers should also ask how the lender proves that the float-down threshold was met. Mortgage rates change with market conditions, loan type, credit score, points, loan-to-value ratio, occupancy, and lock length. A vague promise to “see what we can do” is weaker than a written policy.
Cost And Strategy
A float-down option is valuable when rate volatility is high and closing is far enough away for rates to move meaningfully. It is less valuable when the lock period is short, the fee is high, or the float-down threshold is unlikely to be met. Borrowers should evaluate it like insurance: What does it cost, what event triggers it, and what benefit would it deliver?
It is also not a substitute for shopping before locking. A borrower with a float-down at a high-rate lender may still do worse than a borrower who locked a more competitive rate elsewhere. The feature should be judged against the full loan estimate, not the rate alone.
Example
A borrower locks a 6.75% rate for 45 days and pays for a one-time float-down option. The agreement says the borrower can float down if the same loan program improves by at least 0.25 percentage points and the request is made within 15 days of closing. If the lender’s eligible rate falls to 6.50%, the borrower may be able to reset the lock under the agreement’s terms.
The Bottom Line
A float-down option can reduce the risk of locking too early in a falling-rate environment. Its real value depends on the written trigger, cost, timing, and whether the borrower would still have a competitive loan after using it.