Yes, you can pay only the interest on a mortgage for a set initial period, usually five to ten years, if you take out an interest-only mortgage. During that window your monthly payment covers the interest charge and nothing else, so the balance you borrowed stays exactly where it started. You get a lower payment now in exchange for a larger payment later, plus stricter qualification standards and some real risks that are worth understanding before you sign.
How the Payment Math Works
The calculation is simple. Multiply your loan balance by the annual interest rate, then divide by twelve. A $400,000 loan at 6% produces an interest-only payment of $2,000 a month. After five or ten years of paying that amount on time, you still owe the full $400,000.
Because none of your payment touches principal, you build zero equity from making payments. Equity grows only if the property itself appreciates. If values fall, you can end up owing more than the home is worth, which makes selling or refinancing difficult without bringing cash to closing.
Most interest-only loans let you make voluntary principal payments whenever you want, and doing so lowers the balance that eventually has to be amortized. Some borrowers use the structure that way on purpose: pay interest only during tight months, send extra toward principal when there’s room. Confirm with your lender that the loan terms allow prepayments without restriction.
What Lenders Require
Interest-only borrowers face tougher underwriting than borrowers taking a standard amortizing loan. Expect to need a credit score of at least 680, with better pricing available at 720 and above. Down payments typically start at 15% to 20%, sometimes more depending on loan size and property type. Lenders also look for liquid reserves, often six to twelve months of mortgage payments sitting in accessible accounts.
Federal law requires every lender to make a reasonable, good-faith determination that you can repay the loan. This Ability-to-Repay standard, codified in Regulation Z, applies to all residential mortgage loans, including interest-only products.1eCFR. 12 CFR 1026.43 – Minimum Standards for Transactions Secured by a Dwelling The lender must verify your income using tax returns, W-2s, or similar documentation and must consider your debt-to-income ratio.
One technical point matters for how lenders qualify you. Interest-only loans cannot be classified as “qualified mortgages” under federal rules. The Consumer Financial Protection Bureau explicitly prohibits interest-only features in all qualified mortgage categories.2Consumer Financial Protection Bureau. Ability-to-Repay and Qualified Mortgage Rule Small Entity Compliance Guide Lenders issuing these loans lose the legal safe harbor that comes with a qualified mortgage, and they must qualify you at the fully amortizing payment amount using the higher of the fully indexed rate or the introductory rate, not at the lower interest-only payment.1eCFR. 12 CFR 1026.43 – Minimum Standards for Transactions Secured by a Dwelling In other words, the lender has to be confident you could handle the bigger payment on day one.
There is no hard federal cap on debt-to-income ratios for interest-only loans. The old 43% DTI ceiling applied only to qualified mortgages and was removed from that definition in 2021.2Consumer Financial Protection Bureau. Ability-to-Repay and Qualified Mortgage Rule Small Entity Compliance Guide Individual lenders set their own internal limits, and those vary.
Where Interest-Only Options Actually Exist
Adjustable-Rate Mortgages
The most common place to find an interest-only feature is on an adjustable-rate mortgage with an initial interest-only period of five to ten years. During that window you pay only interest at a fixed introductory rate. When the period ends, two things happen at once: the rate starts adjusting against a market index such as the Secured Overnight Financing Rate, and the payment shifts to include principal. That double shift is the real exposure.
Rate caps provide some protection. A typical five-year ARM caps the first adjustment at 2 percentage points above the initial rate, with later annual adjustments capped at 1 point and a lifetime cap of 5 points above the start rate. Seven- and ten-year ARMs often allow a larger initial adjustment of up to 5 points.3Office of the Comptroller of the Currency. Interest-Only Mortgage Payments and Payment-Option ARMs
Home Equity Lines of Credit
A HELOC is a revolving credit line secured by your home’s equity, and most include a draw period of up to ten years during which you pay only interest on whatever amount you have drawn. Borrow $50,000 against a $150,000 line, and interest accrues only on the $50,000. When the draw period ends, the line converts to a repayment phase covering both principal and interest.
Jumbo and Portfolio Loans
Because interest-only loans cannot be qualified mortgages, Fannie Mae and Freddie Mac will not buy them. Lenders either hold them on their own books or sell them through private channels, so you’ll usually find these loans at portfolio lenders, private banks, and non-QM lenders. Many exceed the 2026 conforming loan limit of $832,750, which puts them in jumbo territory with correspondingly tighter underwriting.4Federal Housing Finance Agency. FHFA Announces Conforming Loan Limit Values for 2026
What Happens When the Interest-Only Period Ends
The transition is the moment that catches people off guard. If a 30-year loan includes a 10-year interest-only period, the full principal has to be repaid over the remaining 20 years instead of 30. That compressed schedule pushes the monthly payment up sharply.
Back to the $400,000 example at 6%. The interest-only payment is $2,000. Once the loan recasts to full amortization over 20 years at the same rate, the payment climbs to about $2,866 a month, a 43% jump with no change in the interest rate. If the loan is an ARM and the rate has also moved up, the increase can be far steeper. The Office of the Comptroller of the Currency warns that payments on interest-only and payment-option ARMs can rise as much as double or triple the initial amount.3Office of the Comptroller of the Currency. Interest-Only Mortgage Payments and Payment-Option ARMs
The recast happens automatically on the date in your loan agreement. There’s no new application, no credit check. Your servicer sends a revised schedule showing how each future installment splits between principal and interest. Missing those higher payments triggers the same default and foreclosure process as any other mortgage delinquency.
Voluntary Recast Before the Reset
If you make a large lump-sum principal payment during the interest-only period, some lenders will recalculate your future payments against the reduced balance on request. That softens the eventual jump. Recast requests typically require a minimum principal payment of $5,000 to $10,000 and are generally limited to conventional loans. Not every lender offers this, so ask before closing.
The Risks Worth Weighing
The core risk is that you aren’t reducing what you owe. Every month at the interest-only payment is a month your debt stays flat while a neighbor with a standard loan is chipping away at theirs. If appreciation is the only thing building your equity, a flat or falling market leaves you exposed.
Negative equity is the worst version of that exposure. If values drop below your balance, selling won’t cover the payoff. You would either bring cash to closing or try to negotiate a short sale. The risk is sharper for interest-only borrowers because standard amortization hasn’t been quietly cushioning you.
Payment shock is the other major concern. A Government Accountability Office analysis found that borrowers with payment-option ARMs saw monthly payments rise by 70% or more when the minimum-payment period expired, and in some cases the increase exceeded 128% from initial levels.5U.S. Government Accountability Office (GAO). Alternative Mortgage Products: Impact on Defaults Remains Unclear, but Disclosure of Risks to Borrowers Could Be Improved Pure interest-only loans produce smaller jumps than payment-option ARMs, but they still hit hard, especially when a rate adjustment lands at the same moment principal payments start.
Worth knowing: an interest-only loan is not a negative amortization loan. With interest-only, the balance stays flat because you are paying all the interest owed each month. With a payment-option ARM where the minimum payment is less than the interest due, the shortfall gets added to the balance and you end up owing more than you borrowed.3Office of the Comptroller of the Currency. Interest-Only Mortgage Payments and Payment-Option ARMs Make sure you know which product you’re being offered.
Getting Out Before the Reset
Federal law prohibits prepayment penalties on interest-only mortgages. Because they can’t be qualified mortgages, they fall under the Dodd-Frank Act’s blanket ban on prepayment penalties for non-qualified residential mortgage loans.6Office of the Law Revision Counsel. 15 USC 1639c – Minimum Standards for Residential Mortgage Loans You can pay down or pay off the balance at any time without a fee. This applies to loans originated after January 10, 2014, when the CFPB’s implementing regulations took effect.
That freedom gives you several exit routes before the payment shift:
- Refinance into a fixed-rate loan. With enough equity and solid credit, you can replace the looming jump with a predictable 30-year schedule. The constraint is equity. Since your payments haven’t reduced the balance, you need appreciation or voluntary principal payments to have built enough.
- Sell before the reset. If you planned to hold the property only a few years, selling during the interest-only period pays off the loan. This works in appreciating markets and gets ugly in flat or declining ones.
- Pay down principal voluntarily. Treat the interest-only minimum as a floor, not a ceiling, and send extra when cash flow allows. You keep the flexibility and still shrink the balance.
The worst spot to be in is reaching the reset date without a plan: unable to afford the amortizing payment, short on equity to refinance, and unable to sell without a loss. Options then narrow to loan modification talks with your servicer, and starting those conversations early gives you the most leverage.
Mortgage Interest Deduction in 2026
Interest-only payments are fully deductible under the same rules as any mortgage interest, provided you itemize and the loan is secured by a qualified residence. For 2026, the Tax Cuts and Jobs Act cap of $750,000 on mortgage debt eligible for the interest deduction expired after 2025. The limit has reverted to the pre-TCJA threshold of $1,000,000 in total mortgage debt across your primary and secondary residences, or $500,000 if you file married filing separately.7Congressional Research Service. Selected Issues in Tax Policy: The Mortgage Interest Deduction
This matters more for interest-only borrowers than for standard borrowers because the full monthly payment is deductible interest, with no portion allocated to principal. On a $400,000 interest-only loan at 6%, the entire $24,000 you pay in a year is potentially deductible. The deduction applies to your primary home and one additional residence you use personally.8Internal Revenue Service. Real Estate (Taxes, Mortgage Interest, Points, Other Property Expenses)
Before you sign, read the projected payment schedule on the closing disclosure. It must show what the payment will look like after the interest-only period expires. That number is the one to plan your finances around.