To pay off an interest-only mortgage, you generally choose among five paths: send extra money toward principal each month, apply a lump sum and ask for a recast, refinance into a fully amortizing loan, sell the property, or pay the balance off with savings. Which one fits depends on how your loan ends, how much equity you have, and how much time is left before the interest-only period closes.
Know Which Structure You Have
The right strategy starts with what your loan does when the interest-only window closes. Two structures dominate, and they create very different pressure.
The more common version converts automatically to fully amortizing payments. A 30-year loan with a 10-year interest-only period, for example, amortizes the entire balance over the remaining 20 years. Payments jump sharply because they now include principal, and the shorter amortization schedule makes them higher than a fresh 30-year loan would be.
The other version requires a balloon payment: the full principal comes due in one payment at maturity, and failure to pay can lead to foreclosure.1Consumer Financial Protection Bureau. What Is a Balloon Payment? When Is One Allowed?
Pull out your promissory note and any riders and confirm which applies. Every option below works for both, but a balloon deadline compresses your timeline.
Chip Away With Extra Principal Payments
The most direct approach is paying more than the required interest each month. Small overpayments compound, because every dollar of principal you knock down stops accruing interest for the rest of the loan. An extra $300 per month on a $250,000 balance at 6% removes roughly $36,000 of principal over 10 years before you count the interest savings.
When you send extra money, confirm with your servicer that it will be applied to principal rather than held toward the next interest payment. The Consumer Financial Protection Bureau advises borrowers to verify that their loan allows extra payments and that those payments are actually directed to principal.2Consumer Financial Protection Bureau. Your Mortgage Servicer Must Comply With Federal Rules Most servicers let you set up recurring extra payments through their portal.
Prepayment Penalties Are Usually Not a Concern
Federal law generally works in your favor here. Interest-only mortgages typically do not qualify as “qualified mortgages,” and non-qualified mortgages cannot carry prepayment penalties at all. Even the narrow category of qualified mortgages that can include a penalty is capped at 3% of the outstanding balance in year one, 2% in year two, 1% in year three, and zero after that.3Office of the Law Revision Counsel. 15 USC 1639c – Minimum Standards for Residential Mortgage Loans
Loans originated before the rule took effect in 2014 are governed by their original documents, so check the note and your Truth in Lending disclosure for any prepayment clause.
Apply a Lump Sum to Principal
A tax refund, bonus, or inheritance can move the needle much faster than a monthly overpayment because it drops the balance that interest is calculated on immediately. Send written instructions with the payment specifying that the entire amount goes toward principal. A secure message through the servicer’s portal or a letter mailed with the check both work.
Before sending a large payment, request a payoff statement so you know your exact balance plus accrued interest and fees. Federal law requires your servicer to provide an accurate payoff figure within seven business days of receiving your written request.4Office of the Law Revision Counsel. 15 USC 1639g – Requests for Payoff Amounts of Home Loan Interest accrues daily on most mortgages, so the sooner the payment posts, the less you owe.
Recast After a Large Payment
A recast (also called reamortization) lets you make a substantial principal payment and then have your servicer recalculate the monthly payment on the new, lower balance while keeping your existing rate and remaining term. No application, credit check, or appraisal is required. It is just new math on the same loan.
Fannie Mae permits servicers to process recasts after a substantial principal payment as long as the original loan terms stay the same except for the reduced payment amount.5Fannie Mae. Recast Loan Overview Government-backed loans (FHA, VA, and USDA) generally are not eligible. Lenders typically require a minimum lump sum around $5,000 to $10,000, charge an administrative fee of a few hundred dollars, and require your account to be current.
Recasting is particularly useful when your interest-only period is winding down. Locking in a lower baseline balance before the loan converts to amortizing payments softens the size of the payment jump.
Refinance Into an Amortizing Loan
Refinancing replaces the interest-only loan with a new mortgage, usually a fixed-rate, fully amortizing one. Payments cover both principal and interest from month one, and you can lock in a predictable rate if your current loan is adjustable.
To qualify, you will generally need:
- Enough equity to keep the loan-to-value ratio below 80%, based on a current appraisal, if you want to avoid private mortgage insurance.
- Two years of W-2s or tax returns, recent pay stubs, and bank statements.
- A credit score that meets the lender’s threshold; conventional loans generally start around 620.
- A debt-to-income ratio the lender considers manageable.
Closing costs typically run 2% to 5% of the new loan amount and cover appraisal, origination, title insurance, and recording fees. Compare those upfront costs against the long-term savings before committing. Refinancing usually takes 30 to 45 days from application to closing, so start well before the interest-only period ends if that is your plan.
Ask for a Loan Modification
If you cannot refinance, perhaps because your credit or equity fell short, you can ask your current servicer to modify the existing loan. A modification changes the terms without creating a new loan. Servicers might extend the term, reduce the rate, or convert the loan from interest-only to amortizing.
You apply to your servicer with proof of income, bank statements, a hardship letter, and a picture of your monthly expenses. Once the servicer has a complete application, federal rules require a written response within 30 days evaluating you for every available loss mitigation option.6eCFR. 12 CFR Part 1024 Subpart C – Mortgage Servicing If the servicer denies a modification, it must explain why, and you may be able to appeal if you submitted the application at least 90 days before any scheduled foreclosure sale.7Consumer Financial Protection Bureau. What Happens After I Complete an Application to Determine My Options to Avoid Foreclosure?
If approved, the modification agreement replaces the affected parts of your original note and sets a new payment schedule showing how each payment splits between principal and interest.
Pay It Off With Savings or Investments
Some borrowers plan from the start to pay off the principal from a brokerage account, maturing endowment, or other investments. Request a payoff statement, then wire the funds by the “good through” date on the statement. Per diem interest accrues every day the payoff is late, so timing the transfer matters.
Watch the Tax Cost of Retirement Withdrawals
Pulling money out of a 401(k), IRA, or other qualified plan before age 59½ to pay off a mortgage triggers a 10% additional tax on top of ordinary income tax on the withdrawal.8Office of the Law Revision Counsel. 26 USC 72 – Annuities; Certain Proceeds of Endowment and Life Insurance Contracts There is no federal exception for paying off an existing mortgage. The first-time homebuyer exception allows up to $10,000 from an IRA without the 10% penalty, but it applies only to buying a first home, not to paying off a mortgage on a home you already own.9Internal Revenue Service. Retirement Topics – Exceptions to Tax on Early Distributions Run the full tax picture with a professional before liquidating retirement accounts.
Sell the Home to Clear the Balance
If you have enough equity, selling ends the mortgage in one transaction. The closing agent orders a payoff statement, and the sale proceeds satisfy the lien before anything comes to you. At closing, the mortgage balance and accrued interest are paid first, then real estate commissions (typically 5% to 6% of the sale price), transfer taxes, and recording fees. Any remaining equity is yours.
The Capital Gains Exclusion on a Primary Home
If you sell your primary residence at a profit, you can exclude up to $250,000 of gain from your income, or $500,000 if you are married filing jointly, provided you owned and lived in the home for at least two of the five years before the sale. Both spouses must meet the use requirement to claim the full $500,000 on a joint return.10Office of the Law Revision Counsel. 26 USC 121 – Exclusion of Gain From Sale of Principal Residence Gain above those thresholds is taxed as capital gain.11Internal Revenue Service. Sale of Your Home The exclusion does not apply to investment or rental properties, and the entire gain on those is taxable.
If You Cannot Pay When the Period Ends
Falling short is a real risk when a balloon comes due or an amortizing payment more than doubles overnight. Federal rules prohibit your servicer from making the first foreclosure filing until you are more than 120 days delinquent. That window is designed to let you pursue a modification, refinance, short sale, or repayment plan. If you submit a complete loss mitigation application during it, the servicer must evaluate you for every available option within 30 days and cannot proceed to a foreclosure sale while your application is pending.6eCFR. 12 CFR Part 1024 Subpart C – Mortgage Servicing
Foreclosure does not necessarily end the debt. If the property sells for less than you owe, the lender may pursue a deficiency judgment for the shortfall. Some states bar deficiency judgments after non-judicial foreclosure; others allow them. Some servicers waive them based on the borrower’s circumstances. That uncertainty is the reason to exhaust the payoff strategies above before default becomes the outcome.