Yes, you can pay only the interest on a mortgage for a set period if you take out a loan designed that way. An interest-only mortgage lets your monthly payment cover just the interest charges for the first several years, leaving the original balance untouched, and then requires larger payments once principal repayment kicks in. Most lenders offer interest-only options on certain products, but they hold borrowers to stricter standards than they use for conventional fully amortizing loans.
How the Payment Is Calculated
The math is simple. Multiply the loan balance by the annual interest rate, then divide by twelve. A $400,000 loan at 6% costs $2,000 a month during the interest-only period. None of that payment reduces the $400,000 you borrowed. After years of on-time payments, you still owe every dollar of the original balance.
That has a direct consequence for equity. You build none of it through your monthly payments. The only way your ownership stake grows during the interest-only phase is if property values rise on their own. If the market drops, you can end up owing more than the home is worth, which makes refinancing or selling difficult without bringing cash to closing.
Most interest-only loans do allow voluntary payments toward principal, and doing so shrinks the balance that eventually needs amortizing. Some borrowers use this deliberately: they pay only interest in tight months and throw extra cash at the principal when they can. Confirm with your lender that your loan permits principal prepayments without restrictions.
Who Qualifies
Lenders treat interest-only borrowers more cautiously because these loans carry more risk on both sides. Expect to need a credit score of at least 680, with better rates available at 720 and above. Down payments typically start at 15% to 20% of the purchase price, and some lenders require more depending on loan size and property type. Lenders also look for liquid reserves, often six to twelve months of mortgage payments in accessible accounts, as evidence you can absorb financial disruptions.
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 with tax returns, W-2s, or similar documentation and must consider your debt-to-income ratio.
Here is a distinction most borrowers miss. Interest-only loans cannot qualify as “qualified mortgages” under federal rules, because 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 That means the lender loses the legal safe harbor that comes with a qualified mortgage, and underwriting gets tighter as a result. Lenders must qualify you at the fully amortizing payment amount, not just the lower interest-only payment, using the higher of the fully indexed rate or the introductory rate.1eCFR. 12 CFR 1026.43 – Minimum Standards for Transactions Secured by a Dwelling
There is no hard federal cap on debt-to-income ratios for these loans. The old 43% DTI ceiling applied only to qualified mortgages and was removed from that definition in 2021. The general Ability-to-Repay rule requires lenders to consider your DTI but sets no specific threshold.2Consumer Financial Protection Bureau. Ability-to-Repay and Qualified Mortgage Rule Small Entity Compliance Guide Individual lenders set their own limits, and those vary.
Where You Find Interest-Only Options
Interest-Only Adjustable-Rate Mortgages
The most common vehicle is an ARM 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 begins adjusting based on a market index like the Secured Overnight Financing Rate, and the payment shifts to include principal repayment. That combined adjustment is where the real exposure sits.
Rate adjustment caps offer some protection. A typical five-year ARM caps the first adjustment at 2 percentage points above the initial rate, subsequent annual adjustments at 1 point, and the lifetime cap at 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 Those caps matter when you project what your payment might look like after the reset.
Home Equity Lines of Credit
A HELOC is a revolving credit line secured by your home’s equity, and most come with a draw period of up to ten years during which you pay only interest on what you have borrowed. If you have drawn $50,000 against a $150,000 line, you pay interest only on the $50,000. Once 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. The lender must hold the loan on its own books or sell it privately. In practice, interest-only options are most commonly available through portfolio lenders, private banks, and non-qualified mortgage lenders. Many of these loans exceed the 2026 conforming loan limit of $832,750, placing them in jumbo territory with 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. On a 30-year loan with a 10-year interest-only period, the entire principal balance must be repaid over the remaining 20 years instead of 30. That compressed timeline drives payments up sharply.
Return to the earlier example. A $400,000 loan at 6% costs $2,000 a month during the interest-only phase. Once it recasts to full amortization over 20 years at the same rate, the payment jumps to roughly $2,866. That is a 43% increase with no change in the interest rate. If the loan is an ARM and the rate has climbed, 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 at the date specified in your loan agreement. You do not apply or go through a new credit check. Your servicer sends a revised payment schedule showing how each installment breaks down. Missing the higher payments triggers the same default and foreclosure process as any other mortgage delinquency.
Voluntary Recasting Before the Reset
If you make a large lump-sum payment toward principal during the interest-only period, some lenders allow you to request an early recast. The lender recalculates future payments based on the reduced balance, softening the eventual payment shock. 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
The core risk is straightforward. You are not reducing what you owe. Every month of interest-only payments is a month where your debt stays flat while a conventional borrower in the same house is chipping away at their balance. If you are counting on appreciation to build your equity, a flat or falling market leaves you exposed.
Negative equity is the worst-case version. If property values drop below your loan balance, selling will not cover the payoff. You either bring cash to closing or negotiate a short sale. This risk hits interest-only borrowers harder because payments have not reduced the balance at all.
Payment shock is the other major concern. A Government Accountability Office analysis found that borrowers with payment-option ARMs saw monthly payments increase 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 but still significant jumps, especially when rate adjustments coincide with the start of principal payments.
One distinction worth keeping straight: an interest-only loan is not the same as a negative amortization loan. With interest-only payments, your balance stays flat because you cover all the interest each month. With a payment-option ARM where the minimum payment falls below the interest due, unpaid interest 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 Know which product you are looking at.
Prepayment Freedom and Exit Strategies
Federal law prohibits prepayment penalties on interest-only mortgages. Because they cannot be qualified mortgages, they fall under the Dodd-Frank Act’s 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 ways to exit before the payment reset hits:
- Refinance into a fixed-rate loan. If you have enough equity and solid credit, refinancing into a conventional 30-year fixed mortgage replaces the looming payment jump with a predictable schedule. The constraint is equity. Since your payments have not reduced the balance, you need appreciation or voluntary principal payments to have built enough equity for a new lender to approve.
- Sell before the reset. Borrowers who planned to hold the property only a few years can sell during the interest-only period and use proceeds to pay off the loan. This works in appreciating markets and becomes problematic if values have stagnated.
- Make voluntary principal payments. Nothing stops you from paying more than the interest-only minimum. Treating the feature as optional rather than mandatory gives you the flexibility of low required payments while still reducing the balance when finances allow.
The worst place to end up is at the reset date without a plan. If you cannot afford the amortizing payments, cannot refinance due to insufficient equity, and cannot sell without a loss, your options narrow to loan modification negotiations with your servicer. Start those conversations early.
Tax Treatment in 2026
Interest-only payments are fully deductible under the same rules that apply to any mortgage interest, provided you itemize and the loan is secured by a qualified residence. 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 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 annually 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)