Briefly Digest

Interest Only Loan Calculator

Estimate the interest-only payment on a balance and rate, then remember that principal still waits in the background until amortisation or a balloon arrives.

Result

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Interest-only payments are a cash-flow choice, not free money

An interest-only period charges you for the use of principal without shrinking it. That can free monthly cash for renovations, bridging, or investment cash flow—but the debt remains. When the interest-only window ends, payments can jump. This calculator estimates the interest-only installment so you can see that trade clearly.

Use with eyes open

Model what happens when amortisation returns: open the standard loan or mortgage tools with the same balance and a full term. If you cannot stress-test that higher payment, interest-only may be a fragile fit. Exit fees, rate resets, and underwriting eligibility are outside this browser math.

Education only

Outputs are estimates for planning conversations in the US and UK markets, not offers of credit or regulated advice.

FAQ

How is an interest-only payment calculated?
A simple monthly interest-only payment is roughly balance × annual rate ÷ 12. Principal does not fall unless you pay extra or the product later amortises.
Why do interest-only loans feel cheaper?
Early payments skip principal reduction, so the cash outflow can be lower—until a reset, refinance, or balloon restores full amortising payments.
Are interest-only mortgages common?
They appear in niches and investor products more than mainstream owner-occupier loans. Rules and risks differ sharply by lender and country.

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