To pay off an interest-only mortgage, you generally have six paths: make extra principal payments over time, apply a lump sum and recast the loan, refinance into a standard amortizing mortgage, request a loan modification, pay off the balance from savings or investments, or sell the property. Which option fits depends on how much equity you have, how your loan is structured, and how much time you have before the interest-only period ends.
Know What You’re Actually Paying Off
Interest-only mortgages end in one of two ways, and the ending shapes your strategy.
Many loans convert to fully amortizing payments once the interest-only window closes, typically after 5, 7, or 10 years. The monthly payment jumps because principal is now included, and the balance is spread over the shorter remaining term. On a 30-year loan with a 10-year interest-only period, the full balance amortizes over the final 20 years, producing payments higher than a fresh 30-year loan would.
Other interest-only loans require the entire principal in a single balloon payment at maturity. If you cannot pay, you face foreclosure.1Consumer Financial Protection Bureau. What Is a Balloon Payment? When Is One Allowed?
Pull your promissory note and any riders to confirm which applies. The repayment options below work for both, but a balloon date is a hard deadline; a conversion to amortizing payments is a payment-shock problem you can soften but not postpone.
Make Extra Principal Payments
The simplest way to shrink the balance is to pay more than the required interest each month. Even modest extra amounts compound, because every dollar of principal you knock down stops accruing interest. Paying an extra $300 a month on a $250,000 balance at 6% would cut roughly $36,000 of principal over 10 years before counting the reduced interest.
When you send extra money, tell your servicer in writing to apply it to principal rather than hold it toward future interest. The CFPB advises borrowers to confirm their loan allows extra payments and that those payments are credited to principal.2Consumer Financial Protection Bureau. Your Mortgage Servicer Must Comply With Federal Rules Most servicers let you set up recurring extra principal payments through their online portal.
Prepayment Penalties Are Usually Not an Issue
Interest-only mortgages generally do not meet the federal definition of a “qualified mortgage,” and non-qualified mortgages cannot carry prepayment penalties at all. For the narrow set of qualified mortgages that can include a penalty, federal law caps it 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
These rules took effect in 2014. If your loan was originated earlier, your original note controls, so check it for a prepayment clause before you commit to an aggressive payoff plan.
Apply a Lump Sum and Recast the Loan
A tax refund, bonus, inheritance, or investment payout can take a much larger bite out of the balance than monthly overpayments. Interest accrues daily on most mortgages, so the sooner the payment posts, the less interest you owe going forward. Send written instructions with the payment specifying that the full amount be applied to principal.
Before you send a large payment, request a payoff statement from your servicer showing your exact balance plus accrued interest and fees. Federal law requires servicers to deliver an accurate payoff figure within seven business days of a written request.4Office of the Law Revision Counsel. 15 USC 1639g – Requests for Payoff Amounts of Home Loan
After a sizeable lump-sum payment, ask whether your servicer will recast the loan. Recasting (also called reamortization) recalculates your monthly payment based on the new, lower balance while keeping your existing interest rate and remaining term. There is no new application, credit check, or appraisal. Fannie Mae permits servicers to recast after a substantial principal payment as long as the other loan terms stay the same.5Fannie Mae. Recast Loan Overview
Expect a few conditions: FHA, VA, and USDA loans are generally not eligible; servicers often set a minimum lump sum in the $5,000 to $10,000 range; an administrative fee of a few hundred dollars usually applies; and you must be current on payments. Recasting is especially useful just before an interest-only period ends, because it locks the smaller balance in as the new baseline for the amortizing payments that follow.
Refinance Into a Standard Mortgage
Refinancing replaces the interest-only loan with a new, usually fixed-rate, fully amortizing mortgage. Principal starts coming down with every payment, and you can lock in a predictable rate if your current loan is adjustable.
To qualify, lenders will typically look for:
- A loan-to-value ratio below 80% to avoid private mortgage insurance, confirmed by a current appraisal.
- Two years of W-2s or tax returns, recent pay stubs, and bank statements.
- A credit score of at least 620 for most conventional loans.
- A debt-to-income ratio the lender considers manageable.
Closing costs run roughly 2% to 5% of the new loan amount and include appraisal, origination, title, and recording fees. Weigh those costs against the long-term savings from a lower rate or steadier payments. Refinancing usually takes 30 to 45 days from application to closing, so start well before your interest-only period ends if you want the new loan in place first.
Ask for a Loan Modification
If refinancing is out of reach, because your credit has slipped or your equity is thin, you can ask your current servicer to modify the existing loan. A modification changes the terms without replacing the mortgage: the servicer might extend the term, reduce the rate, or convert the loan from interest-only to amortizing.
You start with a complete loss mitigation application that includes proof of income, bank statements, a hardship letter, and a monthly expense breakdown. Once your servicer has a complete application, federal rules require a written response within 30 days evaluating you for all available options.6eCFR. 12 CFR Part 1024 Subpart C – Mortgage Servicing A denial has to spell out why, and if you submitted the application at least 90 days before any scheduled foreclosure sale, you may have the right to appeal.7Consumer Financial Protection Bureau. What Happens After I Complete an Application to Determine My Options to Avoid Foreclosure?
If approved, you receive a modification agreement that replaces the relevant portions of the original promissory note and sets a new payment schedule showing how each payment splits between principal and interest.
Pay It Off From Savings or Investments
Some borrowers plan from the start to pay off the principal in one shot when the interest-only period ends, using a brokerage account, maturing endowment, or other investments earmarked for the purpose. The mechanics are straightforward: request a payoff statement, confirm the “good through” date, and wire the funds in time to arrive before that date. Miss it and you owe additional per diem interest for each extra day.4Office of the Law Revision Counsel. 15 USC 1639g – Requests for Payoff Amounts of Home Loan
Think Hard Before Using Retirement Funds
Withdrawing from a 401(k), IRA, or similar qualified plan before age 59½ to pay off a mortgage triggers a 10% additional tax on the amount withdrawn, on top of regular income tax.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 a mortgage on a home you already own. The first-time homebuyer exception that allows penalty-free IRA withdrawals up to $10,000 applies only to purchasing a first home, not to paying down existing mortgage debt.9Internal Revenue Service. Retirement Topics – Exceptions to Tax on Early Distributions Run the numbers with a tax professional before liquidating any retirement account.
Sell the Property
If you have enough equity, selling clears the mortgage entirely. The closing agent requests a payoff statement from your lender, and the sale proceeds pay the existing lien before anything reaches you. At closing, the title company disburses in order: mortgage balance and accrued interest first, then closing costs, real estate commissions (typically 5% to 6% of the sale price), transfer taxes, and recording fees. What remains is your equity.
The Capital Gains Exclusion on a Primary Residence
If the home is your primary residence and you sell at a profit, you can exclude up to $250,000 of gain from income, or $500,000 if married filing jointly, provided you owned and lived in it for at least two of the five years before the sale. Both spouses must meet the use requirement for the full $500,000 exclusion on a joint return.10Office of the Law Revision Counsel. 26 USC 121 – Exclusion of Gain From Sale of Principal Residence Gain above the threshold is taxed as a capital gain, and for most sellers of a primary home the exclusion covers the whole profit.11Internal Revenue Service. Sale of Your Home The exclusion does not apply to investment or rental property; the full gain is taxable in that case.
If You Can’t Pay When the Period Ends
Missing the first higher amortizing payment, or a balloon date, puts you on the path to default, but federal rules give you time to act. A servicer cannot make its first foreclosure filing until the loan is more than 120 days delinquent. That window exists so you can pursue a modification, refinance, repayment plan, or short sale. If you submit a complete loss mitigation application during the window, the servicer must evaluate you for every option within 30 days and cannot proceed with a foreclosure sale while the application is pending.6eCFR. 12 CFR Part 1024 Subpart C – Mortgage Servicing
One warning on the back end: if foreclosure happens and the property sells for less than you owe, the lender may be able to pursue a deficiency judgment for the shortfall. Some states bar deficiency judgments after a non-judicial foreclosure; others allow them. Foreclosure does not always erase the debt, which is reason to work through every alternative first.
Costs to Plan For
Whichever route you take, budget for the moving pieces:
- Appraisal fees of roughly $400 to $800 for a standard single-family home, required for refinancing and sometimes for modifications.
- A recast administrative fee, usually a few hundred dollars.
- Refinancing closing costs of 2% to 5% of the new loan amount, covering origination, title, recording, and related charges.
- Recording fees to release the lien once the loan is paid, which vary by jurisdiction.
- Per diem interest from your last regular payment through the day the payoff funds post. On a large balance, a few extra days adds up.
Build enough lead time into your timeline to absorb normal delays without missing a payoff date or triggering extra interest. If the interest-only period is closing in and you have not picked a path, start with a current payoff statement and a conversation with your servicer about recast eligibility, because that pair of facts narrows the choice quickly.