Repayment vs Interest-Only Mortgages (2026): Which Is Right for You?
Every mortgage repays one of two ways. A repayment mortgage clears the loan by the end of the term; an interest-only mortgage keeps payments low but leaves the full balance to repay at the end. Here’s how they compare on cost, who each suits, and when interest-only is even allowed.
Quick Answer
With a repayment mortgage (also called capital-and-interest), each monthly payment covers the interest and chips away at the loan, so the balance reaches zero by the end of the term — you own the home outright. With an interest-only mortgage, you pay only the interest each month, so payments are lower, but the full original balance is still owed at the end and must be repaid another way.
Most residential borrowers choose repayment for the certainty of clearing the debt. Interest-only is common for buy-to-let and suits specific situations where a credible plan exists to repay the capital. Your home may be repossessed if you do not keep up repayments on your mortgage.
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What Is a Repayment Mortgage?
A repayment mortgage — the standard choice for most homeowners — splits every monthly payment between interest and capital. Early on, most of the payment is interest; over time the balance falls and more of each payment goes toward the capital. By the end of the term, the loan is fully repaid and the home is yours, free of the mortgage.
The appeal is certainty: as long as you keep up payments, the debt is guaranteed to be gone by the end. You build equity steadily, you’re never left with a lump sum to find, and you don’t need a separate plan to repay the balance. The trade-off is that monthly payments are higher than interest-only, because you’re paying down the loan as well as the interest.
What Is an Interest-Only Mortgage?
With an interest-only mortgage, your monthly payment covers only the interest. The capital — the amount you originally borrowed — doesn’t reduce at all during the term. At the end, you still owe the full original sum and must repay it in one go.
That makes the monthly payments noticeably lower, which is the whole attraction. But it comes with a firm condition: you need a credible repayment strategy (lenders call it a repayment vehicle) to clear the capital at the end — savings, investments, the sale of another asset, or selling the property itself. Lenders will want to see this plan before approving interest-only.
The interest-only trap to avoid
Because the balance never shrinks, interest-only can cost far more in total interest over the full term, and leaves you facing the entire original loan at the end. Without a solid, funded plan to repay that capital, you risk having to sell the home to clear the debt. This is exactly why lenders — and good advice — insist on a repayment strategy up front.
The Cost Difference: Monthly vs Total
This is the heart of the comparison, and it cuts both ways:
Repayment
Higher monthly payments, because you pay interest plus capital. But lower total cost over the life of the loan, because the shrinking balance means you pay interest on less and less — and you end debt-free.
Interest-only
Lower monthly payments, since you pay interest only. But higher total cost, because the balance never falls so you pay interest on the full amount throughout — plus you still owe the whole capital at the end.
So the choice is really about when you pay: repayment costs more each month but less overall and clears the debt; interest-only costs less each month but more overall and defers the capital. On a large balance the monthly difference can be substantial, which is why interest-only appeals to those prioritising cash flow — but the total-cost and end-of-term realities are why most residential buyers still choose repayment. The amount you can borrow is assessed differently too, since lenders test interest-only carefully.
When Is Interest-Only Allowed?
Since the rules tightened after the credit crunch, residential interest-only is no longer handed out freely — lenders apply strict criteria:
- A credible repayment vehicle — evidence of how you’ll repay the capital (investments, savings, other property, pensions in some cases). Lenders assess and monitor this.
- Higher deposit / lower loan-to-value — interest-only usually requires more equity than a repayment deal.
- Higher minimum income — many lenders set income thresholds for residential interest-only.
There are two big exceptions where interest-only is standard, not exceptional. Buy-to-let mortgages are usually interest-only — the property itself, sold or refinanced, is the repayment plan, and low monthly costs maximise rental profit. And retirement interest-only (RIO) mortgages let older borrowers pay interest indefinitely, with the loan repaid when the house is eventually sold. Outside these, residential interest-only is a specialist route where a broker’s knowledge of which lenders accept which repayment vehicles genuinely matters.
Who Each Type Suits
Repayment suits…
- Most residential buyers and first-time buyers
- Anyone who wants the certainty of owning outright
- People without a separate capital-repayment plan
- Those prioritising lower total cost over lower monthly cost
Interest-only suits…
- Landlords, where it’s the norm
- People with a genuine, funded repayment strategy
- Those prioritising cash flow (e.g. variable income)
- Older borrowers via retirement interest-only
For most people buying a home to live in, repayment is the sensible default. Interest-only is a considered choice for specific circumstances — not a way to simply afford a bigger mortgage, which is the misuse the tighter rules were designed to prevent.
Can You Switch Between Repayment and Interest-Only?
Often, yes — subject to your lender’s agreement and criteria. Moving from interest-only to repayment is usually welcomed (you’re reducing the lender’s risk), though your monthly payments will rise. Moving from repayment to interest-only is harder and requires meeting the interest-only criteria above, including a repayment vehicle.
You can also mix the two — a part-and-part mortgage runs some of the balance on repayment and some on interest-only, balancing lower monthly cost against steadily clearing part of the debt. It’s a useful middle ground, and switching or restructuring is often done at remortgage time. A broker can tell you what your lender will allow and whether a switch stacks up.
The bottom line
Repayment costs more monthly but clears your mortgage and costs less overall — the right default for most people buying a home. Interest-only keeps monthly payments low but leaves the full balance to repay and costs more in total, making sense mainly for landlords, those with a genuine repayment plan, or via retirement interest-only. The decision hinges on your goals, your cash flow, and whether you have a funded way to repay the capital.
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Frequently Asked Questions
Is a repayment or interest-only mortgage better?
For most people buying a home, repayment is better: your payments clear the loan so you own the property outright by the end, and you pay less interest in total. Interest-only keeps monthly payments lower but leaves the full balance to repay at the end and costs more overall, so it suits specific situations — landlords, people with a genuine repayment plan, or older borrowers via retirement interest-only. There’s no universal winner; it depends on your goals and cash flow.
What’s the difference between interest-only and repayment?
On a repayment mortgage, each payment covers interest and part of the capital, so the balance falls to zero by the end of the term. On interest-only, you pay just the interest, so the balance never reduces and the full original amount is still owed at the end. Repayment means higher monthly payments but a cleared debt; interest-only means lower payments but a lump sum to repay and more interest overall.
Why are interest-only payments lower?
Because you’re only paying the interest, not repaying any of the capital. On a repayment mortgage each payment also chips away at the loan itself, which pushes the monthly cost higher. The lower interest-only payment is appealing for cash flow, but it comes at a price: the balance doesn’t shrink, you pay interest on the full amount throughout, and the original sum still has to be repaid at the end.
Can I get an interest-only mortgage?
For a residential property it’s possible but criteria are strict: lenders want a credible repayment strategy for the capital (such as investments, savings or another property), usually a lower loan-to-value with more equity, and often a higher minimum income. Buy-to-let interest-only is far easier, as the property is the repayment plan. A broker can tell you which lenders accept your circumstances and repayment vehicle.
Does interest-only cost more in the long run?
Usually yes. Because the balance never reduces, you pay interest on the full amount for the entire term, so total interest is higher than an equivalent repayment mortgage — and you still owe the whole capital at the end. Interest-only lowers your monthly outgoings, but over the full term it typically costs more overall, which is a key reason most residential buyers choose repayment.
Can I switch from interest-only to repayment?
Usually yes, and lenders often welcome it because it reduces their risk — though your monthly payments will rise as you start repaying capital. Switching the other way, from repayment to interest-only, is harder and means meeting the interest-only criteria, including a repayment vehicle. You can also split the difference with a part-and-part mortgage. Changes are often made at remortgage time, and a broker can arrange them.
- Financial Conduct Authority (FCA) — Mortgages and Home Finance: Conduct of Business (MCOB) rules on interest-only lending and repayment strategies
- MoneyHelper — guidance on repayment and interest-only mortgages
- Bank of England — mortgage lending background
Important information
nextmove is an introducer, not a lender or adviser. This article is for general information only and does not constitute financial advice. We introduce you to FCA-regulated mortgage brokers who can advise on your individual circumstances, and we may receive a fee or commission for doing so.
Your home may be repossessed if you do not keep up repayments on your mortgage. With interest-only, you must have a plan to repay the capital at the end of the term. Rates, criteria and lender availability change over time — always confirm current terms with a regulated adviser before proceeding.
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