Interest-Only Mortgages: How They Work

An interest-only mortgage lets you pay only the interest due for an initial period, with no required payment toward principal. When that period ends, the loan begins amortizing, and your payment rises to cover principal and interest for the rest of the term. Because of this feature, an interest-only loan cannot be a Qualified Mortgage, so these loans are offered as non-QM.

How the interest-only feature works

An interest-only mortgage has two phases. In the first, each payment covers the interest charged on your balance and nothing more, so the amount you owe stays the same unless you choose to pay extra. In the second, the loan amortizes: your remaining balance is spread over what is left of the term, and each payment includes both principal and interest.

Because the full balance is still owed when amortization begins, the payment goes up at that point. Many interest-only loans also carry adjustable rates, so the payment can change for that reason as well. Your loan documents spell out exactly when the interest-only period ends and how the payment is calculated afterward.

Why interest-only makes a loan non-QM

The CFPB's Qualified Mortgage rules exclude loans with certain riskier features, and interest-only payments are one of them. That does not make the loan unregulated. A lender offering a non-QM interest-only loan must still make a reasonable, good-faith determination of your ability to repay under the CFPB Ability-to-Repay rule, and that review generally has to account for the higher payment that follows the interest-only period. Interest-only loans often price higher than agency loans because they carry more risk for the investor.

Who uses interest-only loans

The feature is a cash flow tool. It tends to be used by borrowers who:

Have variable income, such as commissions, bonuses or business distributions, and want flexibility to pay principal in strong months rather than every month
Expect a large future sum, such as proceeds from selling a business or another property, and plan to pay the loan down when it arrives
Hold substantial assets and prefer to keep cash invested or available rather than tied up in home equity
Own investment property and focus on monthly cash flow

It is not a way to stretch into a home that would otherwise be out of reach. If the only way the numbers work is the interest-only payment, the later increase becomes a serious problem.

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Documents lenders commonly ask for

An interest-only feature can be paired with different documentation types. Depending on the program, lenders commonly ask for:

Tax returns, W-2s and pay stubs for full-documentation files
12 or 24 months of bank statements for self-employed borrowers
Brokerage and retirement statements for asset-based qualifying
Statements showing reserves you will have after closing

Lenders generally qualify you on the income and assets you have now, not on money you expect later. A pending business sale or inheritance may explain your plan, but it usually will not count as qualifying income.

Interest-only and adjustable rates

Interest-only periods are often paired with adjustable-rate structures, though fixed-rate versions exist. With an adjustable rate, the payment during the interest-only period can change at each adjustment, and the amortizing payment depends on the rate in effect when that phase begins. Read the adjustment terms closely: how often the rate can change, which index it follows, the margin added to it and any caps on each change. Two kinds of payment change can arrive close together, so plan for both rather than only one.

How it compares with a fully amortizing loan

A standard fully amortizing mortgage reduces your balance with every payment from the start, so you build equity through payments as well as any rise in value. An interest-only loan trades that steady principal reduction for flexibility in the early phase. Over the life of the loan, paying principal later usually means paying more total interest, because the balance stays higher for longer. If you do not need the flexibility, a fully amortizing loan is the simpler choice. If you do, make sure you understand what the payment will be once amortization begins.

Pros and trade-offs

Pro: payment flexibility during the interest-only period, since principal payments are optional
Pro: cash stays available for a business, investments or other goals
Pro: you can still pay principal voluntarily when it suits you
Trade-off: no principal reduction unless you choose to pay extra
Trade-off: the payment increases when the loan begins amortizing
Trade-off: your equity depends on the home's value, so a price decline can leave you owing close to or more than the home is worth
Trade-off: more total interest over time than paying principal from the start

Questions to ask before you choose

Ask the lender exactly when the interest-only period ends, how the payment will be calculated at that point and whether the rate can adjust. Ask whether you can prepay principal without a penalty. Then test your own plan: if the money you expect arrives late or not at all, could you still handle the amortizing payment, refinance or sell? Refinancing is never certain, since it depends on your credit, income and home value at that time.

How to get started

Write down why you want the interest-only feature and how you plan to handle principal. Gather your income and asset documents, and ask a loan officer to show an interest-only option alongside a fully amortizing one so the trade-off is visible in your Loan Estimates. All loans are subject to credit approval, and programs vary by borrower, property and investor.

Who this tends to fit

Your income varies from month to month
You expect a large sum from a business or property sale
You hold significant assets you prefer to keep liquid
You plan to pay principal voluntarily in strong months
You can handle the payment once amortization begins
You accept that your equity will depend on the home's value

Before you call

A clear reason for wanting the interest-only feature
A written plan for repaying principal
Income documents or 12 or 24 months of bank statements
Asset and reserve statements
Questions about rate adjustments and prepayment
Your own view of the amortizing payment you can handle

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Common questions

What is an interest-only mortgage?

An interest-only mortgage is a loan where the required payments cover only interest for an initial period. Your balance does not go down during that time unless you pay extra. After the interest-only period, the loan amortizes and payments include principal and interest, which raises the payment. The feature is offered on non-QM loans because Qualified Mortgage rules exclude interest-only payments.

Why isn't an interest-only loan a Qualified Mortgage?

The CFPB's Qualified Mortgage definition excludes loans with certain features, including interest-only payments, negative amortization and balloon payments. A loan with an interest-only period can still be made, but as a non-QM loan. The lender must still determine in good faith that you can repay, which includes looking at the payment after the interest-only period ends.

What happens when the interest-only period ends?

The loan starts amortizing. Your remaining balance is spread over the rest of the term, so each payment now includes principal as well as interest, and the payment goes up. If the rate is adjustable, it may change too. Many borrowers plan to pay down the balance, refinance or sell before or at that point, but none of those outcomes is certain.

Who should consider an interest-only mortgage?

It tends to suit borrowers with variable income, such as business owners or commission earners, and those expecting a large future sum, such as proceeds from a business or property sale. It can also suit people with significant assets who want to keep cash flexible. It is generally a poor fit if you need the interest-only payment just to afford the home.

Can I pay principal during the interest-only period?

On most interest-only loans, yes. You can usually make extra payments toward principal whenever you choose, which lowers the balance and the interest charged going forward. Check the loan documents for any prepayment penalty and for how extra payments are applied. Paying principal when cash is strong is one way borrowers with uneven income use the feature responsibly.

Do I build equity with an interest-only loan?

Only through a rise in the home's value or extra principal payments you choose to make. Required payments during the interest-only period do not reduce what you owe. If values fall, you could owe close to or more than the home is worth, which makes selling or refinancing harder. Plan for that possibility rather than counting on appreciation.

Interest-Only Mortgages