A cash-flow tool, used carefully
Interest-Only Mortgages
A lower payment, no principal, and a step up later. Genuinely useful for some borrowers and a trap for others. Here's the honest version.
An interest-only mortgage lets you pay only the interest for a set period, usually ten years. The payment is lower. No principal is repaid. At the end of the period the loan amortises over whatever term remains.
That's the whole product. Everything else is whether it suits you.
When it's genuinely smart
Variable income. Commission, bonus, or seasonal earners can carry a low required payment and throw principal at the loan in good months. You control the timing instead of the amortisation schedule controlling you.
Investment property. A lower payment raises the debt service coverage ratio, which is often exactly what makes a DSCR loan qualify. This is a mainstream investor tool, not an exotic one.
A genuinely short hold. If you know you're selling or refinancing in five years, principal paid early does very little for you.
Better uses for the money. If you're maximising a business, a retirement account, or a higher-returning investment, the arithmetic can favor the lower payment. The key word is if. This reasoning is also how people talk themselves into a house they can't afford.
When it's a trap
Buying more house than you can afford. If the only way the payment works is interest-only, you cannot afford the house. The payment is coming.
Assuming you'll refinance out. Rates may be higher. Your income may have changed. The value may have fallen. Refinancing is a plan, not a guarantee.
No equity if values fall. You build nothing during the IO period. If the market drops, you're underwater faster than an amortising borrower.
The payment step, in plain numbers
A thirty-year loan with ten years interest-only has to repay the full principal over the remaining twenty years. That's a materially higher payment than if it had amortised over thirty from the start — even if your rate never changes at all.
Ask for that number before you sign. If a lender won't show it to you plainly, that tells you something.
Where to find them
Interest-only is far more common in jumbo and investor lending than in conforming. It also appears on HELOCs, where the draw period is interest-only by design — and where the same end-of-period step catches people out.
I'll show you the interest-only payment and the amortising payment side by side. Then you decide with both numbers in front of you.
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Questions people ask
How long does the interest-only period last?
Commonly ten years on a thirty-year loan, leaving twenty years to repay the full principal. Some programs run five or seven years.
How much does the payment jump afterwards?
A lot. The full principal has to amortise over the remaining years instead of thirty, so the payment step is steep even if the rate never moves. Know the number before you sign, not after.
Can I pay principal during the interest-only period?
Yes, on most programs, and it is the right habit. Paying principal voluntarily keeps the flexibility while reducing the shock later.
Are these available on investment property?
Yes. Interest-only pairs naturally with DSCR loans because the lower payment improves the debt service coverage ratio, which is often what makes a deal qualify.
Let’s look at your numbers
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Call or text my cell, or book a time. You’ll get a written comparison with real terms and an APR on every option, and if your current deal already wins, I’ll tell you.