A mortgage rate lock float-down option is a lender feature that may let you lower your locked interest rate if market rates drop before closing.
A standard mortgage rate lock protects you from rising rates while your loan is in process. The trade-off is that if rates fall after you lock, you may not automatically get the lower rate.
A float-down option adds a possible way to capture a lower rate, but it usually comes with rules and may come with a cost.
The cost of a float-down option depends on the lender. Some lenders charge a separate fee. Others build the cost into the rate, points or loan pricing. Some may offer it only for certain lock periods, loan types or rate-drop thresholds.
| Float-Down Option Basics |
What To Know |
| What it does |
May let you reduce your locked mortgage rate if market rates fall before closing. |
| Main benefit |
You get protection from rising rates while keeping a limited chance to benefit from falling rates. |
| Main cost |
May involve a fee, higher pricing, points or lender-specific conditions. |
| Common limits |
May require rates to drop by a minimum amount, may be used only once and may need to be requested before a deadline. |
| Best use case |
A longer closing timeline in a volatile rate environment where the potential savings may outweigh the cost. |
What Is A Mortgage Rate Lock?
A mortgage rate lock is a lender’s agreement that your interest rate will not change before closing if you close within the lock period and your application does not change.
The CFPB says a rate lock means your interest rate will not change between the offer and closing, as long as you close within the specified time frame and there are no changes to your application.
Rate locks are commonly available for 30, 45 or 60 days, and some lenders offer longer lock periods. Longer locks may cost more, and an extension can be expensive if the loan does not close before the lock expires.
What Is A Float-Down Option?
A float-down option is an add-on feature that may let you lower a locked mortgage rate if market rates fall during the lock period.
Without a float-down option, a rate lock usually protects you from increases but does not automatically give you a lower rate if rates drop. With a float-down option, the lender may allow one rate reduction if specific conditions are met.
Those conditions vary. A lender may require rates to fall by a minimum amount, such as a specific fraction of a percentage point. The lender may also limit when you can use the float-down, how many times you can use it and which loan programs qualify.
How Much Does A Float-Down Option Cost?
There is no universal float-down cost. Each lender sets its own pricing and rules.
A float-down option may cost money in one or more ways:
- A separate upfront fee.
- A higher locked rate than a standard rate lock.
- Higher discount points or pricing adjustments.
- A cost charged only if you use the float-down.
- A longer lock period that costs more than a shorter standard lock.
Some lenders may advertise a float-down option without a separate line-item fee, but that does not always mean it is free. The cost may be built into the rate or overall loan pricing.
Example Of A Float-Down Cost
Assume you are offered two options:
| Option |
Rate Lock Terms |
Potential Trade-Off |
| Standard rate lock |
6.75% with no float-down option. |
Protects against rate increases, but you may not benefit if rates fall. |
| Rate lock with float-down |
6.875% with a one-time float-down option. |
Costs more through higher pricing, but may let you lower the rate if market rates drop enough. |
In this example, the float-down option is not shown as a separate fee. Instead, the borrower may be paying through a higher starting rate. Another lender might structure the cost as a flat fee, points or a charge only if the float-down is used.
The right comparison is not just “does the float-down cost money?” It is whether the potential rate reduction is likely to save more than the cost.
When A Float-Down Option May Be Worth It
A float-down option may be worth considering when your closing timeline is long enough for rates to move meaningfully and you want protection against rate increases.
It may be more useful when:
- You are buying new construction and have a long timeline before closing.
- Your lender offers a long lock period with a float-down feature.
- Rates have been volatile.
- You want protection from rising rates but do not want to fully give up the possibility of a lower rate.
- The cost of the float-down is small compared with the potential payment savings.
A float-down option is less useful if you are closing soon, the cost is high or the lender’s conditions make it unlikely that you will qualify for the lower rate.
When A Float-Down Option May Not Be Worth It
A float-down option may not be worth the cost if the potential savings are limited.
It may be a poor fit when:
- Your closing date is only a few days away.
- The lender requires a large rate drop before the option can be used.
- The option comes with a high upfront fee.
- The standard lock has much better pricing.
- You are unlikely to keep the loan long enough to benefit from the lower rate.
If the float-down costs more than the likely savings, a standard rate lock may be the cleaner option.
How To Compare Float-Down Costs
Ask the lender to show the standard lock and float-down option side by side. Compare the full loan pricing, not just the advertised rate.
Review:
- The locked interest rate.
- The annual percentage rate, or APR.
- Discount points.
- Any separate float-down fee.
- Whether the fee is refundable.
- The minimum rate drop needed to use the option.
- How many times the option can be used.
- The deadline for requesting the float-down.
- Whether the float-down applies to the rate, points or both.
- Whether changing the loan terms can void or change the lock.
Because mortgage rates can change daily or even more often, get the lock terms in writing before relying on the option.
Float-Down Option vs. Rate Lock Extension
A float-down option and a rate lock extension solve different problems.
| Feature |
Float-Down Option |
Rate Lock Extension |
| Main purpose |
May let you lower your locked rate if market rates fall. |
Extends the lock if the loan will not close before the expiration date. |
| When it matters |
When rates fall before closing. |
When the closing timeline runs longer than expected. |
| Possible cost |
Fee, higher pricing, points or lender-specific conditions. |
Extension fee or pricing adjustment. |
| Main risk |
Rates may not fall enough to use it. |
The extension may be expensive if the loan needs more time. |
The CFPB warns that extending a rate lock can be expensive if the transaction needs more time. If your main concern is a delayed closing, focus on the lock period and extension policy first. If your main concern is missing out on a rate drop, ask about float-down terms.
Questions To Ask Before Paying For A Float-Down
Before choosing a float-down option, ask the lender:
- What does the float-down cost?
- Is the cost charged upfront, at closing or only if I use it?
- Is the cost built into the rate or points?
- How much do rates need to fall before I can use it?
- Can I use the float-down more than once?
- When is the deadline to request it?
- Does the float-down apply automatically, or do I need to ask?
- Can changes to my loan amount, credit, appraisal or closing date affect the option?
- Can I get the float-down terms in writing?
Do not assume the lender will automatically lower your rate if the market improves. You may need to request the float-down and meet the lender’s conditions.
How To Decide If The Cost Is Worth It
To decide whether a float-down option is worth it, compare the cost with the possible savings.
Start with three numbers:
- The cost of the float-down option.
- The payment difference if the rate drops.
- How long you expect to keep the loan.
For example, if the float-down option costs $1,000 and a lower rate would save $60 per month, it would take about 17 months to recover the cost. If you expect to refinance or sell before then, the option may not save enough to justify the cost.
If the float-down has no separate fee but comes with a higher starting rate, compare the higher payment against the chance that rates will fall enough to use the option.
The Bottom Line
A mortgage rate lock float-down option may let you lower your locked rate if market rates fall before closing. It can offer a mix of rate protection and flexibility, but it is not always free and it is not automatic.
The cost depends on the lender. It may show up as a fee, higher pricing, points or lender-specific conditions. Before choosing it, compare the standard lock and float-down option side by side and ask exactly what has to happen for the lower rate to apply.
A float-down option may be worth it when the cost is reasonable, the closing timeline is long and rates could move enough to create meaningful savings. It may not be worth it when the cost is high or the rules make the option hard to use.
Frequently Asked Questions
What Is A Mortgage Rate Lock Float-Down Option?
A float-down option is a lender feature that may let you lower your locked mortgage rate if market rates fall before closing and you meet the lender’s conditions.
How Much Does A Float-Down Option Cost?
Costs vary by lender. A float-down may involve an upfront fee, higher rate pricing, discount points, a fee charged only if used or other lender-specific pricing.
Is A Float-Down Option Free?
Not always. Even if there is no separate fee, the cost may be built into the rate, points or overall loan pricing.
Does A Float-Down Happen Automatically?
Usually no. Many lenders require you to request the float-down and meet specific conditions before closing.
How Much Do Rates Need To Drop For A Float-Down?
The required rate drop depends on the lender. Some lenders require rates to fall by a minimum amount before the float-down can be used.
Can I Use A Float-Down More Than Once?
Usually, float-down options are limited. Many lenders allow only one float-down, but rules vary by lender and loan program.
Is A Float-Down Better Than Waiting To Lock?
It depends on your risk tolerance and closing timeline. A float-down may protect you from rising rates while giving limited access to a lower rate. Waiting to lock may help if rates fall, but it exposes you to the risk that rates rise before closing.
Should I Pay For A Float-Down Option?
It may be worth paying for if the cost is reasonable, the closing timeline is long and the potential rate savings would outweigh the cost. It may not be worth it if you are closing soon or the lender’s conditions make the option unlikely to help.
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