Refinancing from an adjustable-rate mortgage, or ARM, to a fixed-rate mortgage replaces your current loan with a new mortgage whose interest rate does not change over the loan term.
This can protect you from future ARM adjustments and make your monthly principal and interest payment more predictable. However, the fixed rate available when you refinance could be higher than your ARM’s current introductory rate, and the transaction generally includes closing costs.
ARM-to-Fixed Refinance Basics
| Feature |
What It Means |
| Current ARM |
Your rate is fixed for an introductory period and can adjust afterward based on the loan terms. |
| New fixed-rate mortgage |
The interest rate remains the same for the full repayment term. |
| Monthly payment |
Principal and interest become predictable, although taxes, insurance and other housing costs can still change. |
| Timing |
You can refinance before or after the first ARM adjustment if you qualify. |
| Closing costs |
The new mortgage can include lender, appraisal, title and settlement charges. |
| Main trade-off |
You exchange the ARM’s potential for a lower rate for the stability of a fixed interest rate. |
How Does Refinancing an ARM to a Fixed Rate Work?
An ARM-to-fixed refinance is usually a rate-and-term refinance. The new mortgage pays off your adjustable-rate loan and replaces it with a fixed-rate mortgage.
The new loan has its own:
- Interest rate
- Monthly principal and interest payment
- Loan term
- Closing costs
- Mortgage insurance requirements
- Escrow account
The mortgage refinance process generally requires a new application, credit review, income verification, property valuation, underwriting and closing.
You must qualify for the new fixed-rate mortgage based on the applicable loan program and lender requirements. Approval is not guaranteed simply because you already have a mortgage on the property.
Why Do Borrowers Refinance Out of an ARM?
To Avoid a Future Payment Increase
An ARM’s rate can change after the initial fixed period expires. If the rate increases, the monthly principal and interest payment generally increases as well.
Refinancing before the first adjustment can prevent that change from affecting your loan. The new fixed-rate payment may still be higher than your current ARM payment if fixed rates have risen since you bought the home.
To Make the Payment More Predictable
A fixed-rate mortgage keeps the same interest rate over the loan term. Your principal and interest payment remains stable, making long-term budgeting easier.
Property taxes, homeowners insurance, mortgage insurance and homeowners association fees can still change. Refinancing to a fixed rate does not freeze your full housing payment.
To Stay in the Home Longer Than Expected
Some borrowers choose an ARM because they expect to move or refinance during the introductory fixed period. Plans can change.
A fixed-rate refinance may become more attractive if you decide to keep the home beyond the first ARM adjustment and do not want to accept future payment uncertainty.
To Change the Loan Term
You can refinance into another 30-year mortgage or choose a shorter term, such as 15 or 20 years, if available and affordable.
A shorter term can reduce the time needed to repay the loan and may lower total interest. It can also increase the required monthly payment.
How Do ARM Adjustments Work?
Before deciding when to refinance, review the adjustment terms in your current loan documents. The most important numbers are the fixed period, index, margin and rate caps.
The CFPB explains that an ARM’s adjusted interest rate is generally calculated by adding the loan’s margin to its current index value, subject to the applicable caps.
Initial Fixed Period
The initial fixed period is the amount of time the starting rate remains unchanged.
For example:
- A 5/1 ARM generally has a fixed rate for five years and adjusts once per year afterward.
- A 7/1 ARM generally has a fixed rate for seven years and adjusts annually afterward.
- A 10/1 ARM generally has a fixed rate for 10 years and adjusts annually afterward.
The first and second numbers can mean something different for newer ARM structures that adjust every six months, so confirm the exact terms shown in your note and ARM disclosures.
Index
The index is a benchmark interest rate that changes with market conditions. Your mortgage documents identify the index used for your ARM.
An increase in the index can raise your mortgage rate at the next adjustment. A decrease can lower it, subject to the loan’s rate floor and other terms.
Margin
The margin is a fixed percentage set under the mortgage terms. The lender generally adds the margin to the index to calculate the fully indexed rate.
For example, if the index is 4% and the margin is 2.5%, the fully indexed rate would be 6.5% before applying any rate caps.
Rate Caps
Rate caps limit how much the interest rate can change. An ARM can include:
- Initial adjustment cap: Limits the first change after the fixed period.
- Periodic adjustment cap: Limits later changes at each adjustment.
- Lifetime cap: Limits the total increase over the loan’s starting rate.
A 2/1/5 cap structure, for example, could limit the first adjustment to 2 percentage points, later annual adjustments to 1 percentage point and the lifetime increase to 5 percentage points above the initial rate.
Caps limit the speed and total size of increases. They do not guarantee that your payment will remain close to its current amount.
When Should You Refinance Before the First ARM Adjustment?
You do not need to wait for the first adjustment notice before reviewing refinance options. Starting earlier gives you time to compare fixed-rate offers, complete underwriting and address appraisal or title issues.
Refinancing several months before the adjustment may make sense when:
- The fully indexed rate would be substantially higher than your current rate.
- You plan to keep the home beyond the fixed period.
- You want payment certainty before the adjustment occurs.
- Current fixed rates fit your budget.
- The expected benefit justifies the closing costs.
Waiting can make sense when your introductory ARM rate remains lower than available fixed rates and the first adjustment is still several years away.
Your loan servicer generally sends an initial adjustment notice before the first payment at the adjusted rate is due. The notice should show the new interest rate, payment and information used to calculate the change.
Does Refinancing Before the Adjustment Lower Your Payment?
Refinancing into a fixed-rate mortgage does not automatically lower your payment.
Your new payment depends on:
- The fixed interest rate available
- Your remaining mortgage balance
- Closing costs added to the loan
- The new repayment term
- Mortgage insurance
- Property taxes and homeowners insurance
Suppose your ARM currently has a 4.5% introductory rate and the fixed-rate refinance available to you is 6.25%. Refinancing could increase your immediate payment even if it protects you from a potentially higher adjustment later.
The decision may therefore be based on payment stability rather than immediate savings.
How Do You Compare the Refinance Cost With Payment Certainty?
Refinancing creates a new set of closing costs. Common expenses can include lender charges, an appraisal, title services, recording fees, prepaid interest and escrow deposits.
A simple break-even calculation compares the upfront refinance costs with the monthly savings:
Refinance costs ÷ monthly savings = approximate break-even period in months
For example, if the refinance costs $5,000 and lowers your payment by $200 per month:
$5,000 ÷ $200 = 25 months
You would reach the simple break-even point after about 25 months.
This calculation is less direct when the fixed-rate refinance raises the payment initially but protects you from a possible future ARM increase. In that case, compare:
- Your current ARM payment
- The estimated payment after the next adjustment
- The maximum payment allowed by the ARM caps
- The proposed fixed-rate payment
- The refinance closing costs
- How long you expect to keep the mortgage
Do not assume that you will be able to refinance later. Future rates, property values, income, credit and loan requirements can change.
When Could Staying in the ARM Make More Sense?
You Expect to Sell Before the First Adjustment
Keeping the ARM may cost less if you have a realistic plan to sell the home before the fixed period ends. Refinancing could add closing costs without providing enough time to recover them.
Your Current Rate Is Well Below Fixed Rates
An ARM can remain attractive during its introductory period when its rate is substantially lower than current fixed-rate offers.
The potential benefit of an ARM when mortgage rates are high comes from its introductory pricing. That benefit must be weighed against the possibility of a higher payment after the fixed period.
The First Adjustment Is Still Years Away
Refinancing early can mean paying closing costs and accepting a higher fixed rate long before your ARM is scheduled to change.
Review the loan periodically rather than treating the first adjustment date as an immediate deadline years in advance.
Your ARM Could Adjust Downward
An ARM rate can move down when its index declines, subject to the loan terms. Refinancing removes that potential because the new fixed rate does not decrease when market rates fall.
You Would Move Before Reaching the Break-Even Point
A refinance may provide little financial benefit if you expect to sell, pay off the loan or refinance again before recovering the closing costs.
How to Refinance an ARM Into a Fixed-Rate Mortgage
1. Review Your ARM Documents
Find the initial fixed period, next adjustment date, index, margin, caps and any prepayment penalty. Your note, closing documents and adjustment notices should contain this information.
The broader differences between an ARM and a fixed-rate mortgage include payment stability, introductory pricing and exposure to future rate changes.
2. Estimate the Possible Adjusted Payment
Calculate the fully indexed rate using the current index and your margin, then apply the initial adjustment cap. This produces an estimate, not a guaranteed future rate, because the index can change before the adjustment date.
You can use our adjustable-rate mortgage calculator to model how your rate and payment could change after the fixed period.
3. Compare Fixed-Rate Terms
Compare the interest rate, annual percentage rate, payment, closing costs, lender credits and loan term. A lower rate with high upfront costs may not be the best fit if you expect to move soon.
4. Apply and Complete Underwriting
The lender generally reviews your credit, income, assets, debts, mortgage history and property. You may also need an appraisal or another accepted property valuation.
5. Review the New Loan Before Closing
Compare the final fixed-rate payment with your current ARM payment and possible adjusted payments. Confirm whether the new term extends your payoff date and whether closing costs are being paid upfront or added to the balance.
The Bottom Line
Refinancing from an ARM to a fixed-rate mortgage can make your principal and interest payment more predictable and protect you from future rate increases. You can refinance before or after the first adjustment if you meet the new loan’s requirements.
The fixed-rate loan may have a higher payment than your ARM during its introductory period. Compare the closing costs, fixed-rate payment, possible ARM adjustments and expected time in the home before replacing the loan.
Frequently Asked Questions
Can You Refinance an ARM Into a Fixed-Rate Mortgage?
Yes. You can replace an adjustable-rate mortgage with a fixed-rate loan if you meet the lender and loan-program requirements.
Do You Have to Wait Until an ARM Adjusts to Refinance?
No. You can refinance during the initial fixed period. Refinancing early may provide payment certainty, but it can also mean giving up a favorable introductory rate and paying closing costs sooner.
How Long Before an ARM Adjustment Should You Refinance?
There is no universal deadline. Starting several months before the scheduled adjustment can provide time for application, appraisal, underwriting and closing. The best timing depends on available fixed rates, refinance costs and your ARM terms.
Does an ARM Automatically Convert to a Fixed Rate?
Most ARMs do not automatically become fixed-rate mortgages. The rate continues to adjust according to the loan terms unless the mortgage includes a specific conversion option or you refinance.
Can You Convert an ARM Without Refinancing?
Some ARMs include a conversion option that allows the loan to change to a fixed rate under specified conditions. Many do not. Review your mortgage documents and ask your servicer whether your loan includes this feature.
Will Refinancing an ARM Lower Your Payment?
Not necessarily. The new payment depends on the fixed rate, loan balance, term, closing costs and mortgage insurance. A fixed-rate refinance can provide stability even when it does not lower the immediate payment.
What Happens if You Keep an ARM After the Fixed Period?
The interest rate can adjust based on the loan’s index, margin and caps. The principal and interest payment generally changes when the rate changes.
Is a Fixed-Rate Mortgage Always Better Than an ARM?
No. A fixed-rate mortgage provides payment stability, while an ARM can provide a lower introductory rate. The better fit depends on your expected ownership period, ability to handle payment changes and available loan terms.
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