How much higher is the payment after the interest-only period?

It depends on the rate and how much term is left. On a $500,000 loan at 6.50% with a 10-year IO period on a 30-year term, the payment rises from about $2,708 to about $3,728 — a jump of roughly 38%. Ask for the post-recast payment in writing before you commit.

Is an interest-only loan the same as an ARM?

No. An ARM has a rate that adjusts; an interest-only loan can be either fixed or adjustable. What defines the loan is the payment structure during the IO period, not how the rate changes.

Can I pay principal during the interest-only period?

Usually yes — most programs let you make extra principal payments with no prepayment penalty. It is one way to soften the payment jump later.

Are interest-only loans risky?

The main risks are a bigger payment at recast and slower equity growth. They are not inherently predatory — they are a tool. The risk depends on whether you can comfortably afford the fully amortizing payment when the IO period ends.

Mortgage Guide · 2026

Interest-Only Mortgage Loans:Payments, Pros, Cons & Who They're For

A plain-English look at how interest-only payments work, what they cost over time, and the situations where they genuinely help a borrower.

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By Saman Khanian

8 min read

Lower payment now, higher payment later — the choice is about timing.

The basics

How an interest-only payment actually works

A standard amortizing mortgage payment has two parts: interest and principal. An interest-only mortgage pauses the principal part for a set period — commonly 5, 7 or 10 years. During that window, your payment covers only the interest on the loan, so the balance stays where it started and the monthly number is lower.

When the interest-only period ends, the loan "recasts": the remaining balance is re-spread over the years left on the term, and the payment rises. The loan term itself does not restart — a 30-year loan with a 10-year IO period still ends in year 30, which is why the recast payment on the remaining 20 years is noticeably higher.

Key point: the interest-only payment is a lower payment, not a lower cost. The interest continues to accrue, and the principal is simply pushed into the later years of the loan.

Worked example

What the payment looks like in numbers

Here is an illustrative 30-year loan with a 10-year interest-only period at a 6.50% rate. These figures are for illustration only — your actual rate, fees and payment depend on your program and profile.

Loan amount$500,000

Fixed rate (example)6.50%

Interest-only monthly payment (10 years)$2,708

Fully amortizing payment after IO period (20 yrs left)$3,728

Payment increase at recast+$1,020 / month

The same $500,000 loan on a fully amortizing 30-year schedule at the same rate would pay about $3,161 per month from day one.

The trade-offs

Pros and cons of interest-only loans

Pros

The lowest possible monthly payment while the IO period runs — roughly 25–35% below a fully amortizing payment on the same loan.
Frees up cash flow for investments, business capital, renovations or an emergency buffer.
Useful when income is uneven — commission, bonus, RSU vesting or business draws — and a bigger payment later is manageable.
Investor-friendly: keeps debt service low for cash-flow and DSCR calculations on rental property.
Often paired with cash-out or jumbo programs where maximizing liquidity matters more than paying principal early.

Cons

You build no equity from principal reduction during the interest-only period — equity only grows if the property appreciates.
The payment rises at recast. Budget for the higher payment before you sign, not after.
Interest-only options typically carry a slightly higher rate or fee than the same lender's fully amortizing loan.
The IO period does not extend the loan term — a 30-year loan with 10 IO years amortizes over the remaining 20.
Less common on standard agency guidelines; more often found in jumbo, Non-QM, DSCR and investor programs, and some home-equity products.

Fit matters

Who is an interest-only mortgage actually for?

Buyers planning to move or refinance

If you expect to sell or refinance within a few years, the IO period can keep your payment low through the years you actually own the loan.

Investors and portfolio owners

Lower debt service improves cash flow and DSCR math, and lets capital stay in the next deal instead of the mortgage.

High, uneven earners

Self-employed borrowers, commissioned salespeople and equity-compensated professionals whose annual income is real but lumpy.

Jumbo and high-price buyers

On larger loan amounts the monthly savings are meaningful, and jumbo programs are where IO options are most available.

Probably not the right fit if you…

Borrowers who need guaranteed stability. The payment will go up — if that would strain the budget, choose fully amortizing.
Buyers who need equity fast — for example, to remove mortgage insurance or prepare for a near-term cash-out.
Long-term owners who plan to keep the loan for its full life. Full amortization is usually cheaper.
Anyone relying on the lower payment to qualify when the fully amortizing payment would be unaffordable.

Couple analyzing mortgage paperwork with a financial counselor

Run the numbers on the payment you'll have at year 11 — not just year one.

Saman Khanian and the Equitable Lending team compare interest-only, fully amortizing and ARM structures side by side at your numbers, including the post-IO payment — before you commit.

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Questions

Frequently asked questions

During the interest-only period, only the interest is paid, so the principal stays the same unless you make voluntary extra principal payments. After the IO period the loan recasts to a fully amortizing payment that pays off the remaining balance over the remaining term.

Next step

Find out if interest-only fits your loan

Get a side-by-side comparison of interest-only and fully amortizing options — with the post-IO payment in writing — before you decide.

Apply Now Call (877) 885-0111

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