Interest-Only Mortgages UK 2026: Lower Payments, Higher Stakes

The mechanics are straightforward. With a standard repayment mortgage, each monthly payment chips away at both the interest charges and the underlying loan balance. By the end of your 25- or 30-year term, you own the property outright. With an interest-only mortgage, your monthly payments cover only the interest — the capital balance remains untouched throughout the entire term.

Take a £250,000 mortgage over 25 years at an interest rate of 4.5%. On a repayment basis, you would pay approximately £1,390 per month. On interest only, that drops to just £938 — a difference of £452. But here is the catch that too many borrowers gloss over: at the end of those 25 years, you still owe the lender £250,000. On the repayment mortgage, you owe nothing.

The total cost difference is stark. Over 25 years, the repayment borrower pays approximately £417,000 in total (£167,000 in interest). The interest-only borrower pays £281,250 in interest alone, plus still owes the £250,000 capital — a total outlay of £531,250 if they repay the loan in full. Interest-only mortgages are not cheaper; they merely defer the cost. As MoneyHelper explains, you need a separate repayment vehicle to clear the balance at maturity.

For a deeper understanding of how different mortgage types compare, see our UK mortgage rates guide.

Interest-only residential mortgages are considerably harder to obtain than they were before the 2008 financial crisis, when lenders handed them out with minimal scrutiny. The FCA's mortgage conduct rules tightened lending standards significantly, and most high-street lenders now impose strict eligibility criteria.

The typical requirements across major UK lenders in 2026 are:

• Minimum deposit of 25-50%: Most lenders cap interest-only lending at 50-75% loan-to-value (LTV). The best rates typically require at least 40% equity. This is far higher than the 5-10% deposit available on repayment mortgages.
• Minimum income of £75,000: Single applicants generally need to earn at least £75,000 per year. Joint applicants typically need a combined income of £100,000 or one earner above £75,000.
• Minimum equity retained: Some lenders, including Nationwide, require minimum retained equity of £200,000-£300,000 if you plan to sell the property to repay the loan.
• A credible repayment strategy: Every lender will scrutinise how you intend to repay the capital. Gone are the days of vague gestures towards "investments" or "something will turn up."

Lenders offering interest-only residential mortgages include Barclays, NatWest, HSBC, Nationwide, Leeds Building Society, and Coventry Building Society — though each has different criteria and maximum LTV limits. A whole-of-market mortgage broker is essential here, as criteria vary enormously between providers.

Buy-to-let mortgages are a different story entirely. Interest-only remains the norm for landlord borrowers, where rental income covers the interest payments and the property itself is the repayment vehicle. For more on this, see our buy-to-let mortgage guide.

The Bank of England cut the base rate four times during 2025, bringing it down from 4.75% in November 2024 to 3.75% as of December 2025. This downward trajectory has fed through to mortgage pricing, though interest-only rates typically carry a premium of 0.1-0.3 percentage points over equivalent repayment products because lenders view them as higher risk.

Market expectations point to one or two further base rate cuts in 2026, which could push mortgage rates lower still. However, interest-only borrowers need to think carefully about rate sensitivity. Because your monthly payment is pure interest with no capital element, every rate change hits your payment in full. A 1% rate rise on a £250,000 interest-only mortgage adds £208 per month. On a repayment mortgage of the same size, the impact is partially cushioned by the reducing balance over time.

For borrowers considering their options as a fixed-rate deal ends, our remortgaging guide covers the process in detail. And if you are weighing up whether to overpay your existing mortgage or save the difference, read our analysis on saving vs overpaying your mortgage.

The entire premise of an interest-only mortgage rests on your repayment strategy. Get this wrong and you face the terrifying prospect of owing hundreds of thousands of pounds with no way to pay it back. The FCA has warned that a significant proportion of borrowers lack adequate plans.

Here are the strategies lenders will accept, ranked by reliability:

1. Sale of the mortgaged property (downsizing) The most common strategy and one most lenders are comfortable with — provided you retain sufficient equity. If your £400,000 home has a £250,000 interest-only mortgage, you could sell and buy a smaller property for £150,000 or less. The risk: property prices are not guaranteed to rise, and if they fall, your equity cushion shrinks.

2. Investment portfolio (ISAs, general investment accounts) Building a stocks and shares ISA alongside your mortgage is tax-efficient and potentially lucrative. Investing £452 per month (the saving from our earlier example) into a diversified portfolio returning 6% annually over 25 years would accumulate roughly £315,000 — more than enough to clear the £250,000 balance. But investment returns are not guaranteed, and you need the discipline to invest consistently. Visit our investing hub for guidance on building a portfolio.

3. Pension lump sum You can take 25% of your pension tax-free from age 55 (rising to 57 from April 2028). If you have a large enough pension pot, this can clear the mortgage. A £1,000,000 pension pot yields a £250,000 tax-free lump sum — but depleting your retirement savings to pay off a mortgage is a strategy that needs careful consideration. Our pensions hub covers the tax implications.

4. Other property or assets Some borrowers plan to sell a second property, receive an inheritance, or use proceeds from a business sale. Lenders will want evidence these assets exist and are realisable.

5. Switching to repayment before the end of the term You can convert part or all of your mortgage to repayment at any point. This is a sensible fallback if your investment strategy underperforms, though monthly payments will increase significantly — especially if you switch late in the term.

The regulator's data paints a concerning picture. According to FCA analysis, roughly 750,000 interest-only and 245,000 part-interest-only mortgages remain outstanding in the UK — down from nearly 2 million in 2015, but still a substantial number.

The demographics are telling. The median borrower age is 56, the median outstanding balance is £140,000, and the median remaining term is just 8 years. The greatest concentration of maturities falls between 2027 and 2032, with peaks of 72,000 and 77,000 mortgages maturing in 2031 and 2032 respectively.

London is disproportionately affected, accounting for 21% of all interest-only mortgages despite representing only 12% of the total mortgage market. Meanwhile, 22,000 mortgages have already passed their maturity date, with over half overdue by 12 months or more.

The reassuring finding: 82% of borrowers say they are confident they can repay the outstanding capital. But confidence and capability are not the same thing, and the FCA has urged lenders to engage proactively with borrowers as maturity dates approach. If you are in this position, contact your lender sooner rather than later — options narrow as the deadline approaches.

Interest-only mortgages are not inherently good or bad. They are a financial tool, and like any tool, they can be used well or badly. Here is my honest assessment of who they suit:

Good candidates:

• High earners with investment discipline who can genuinely invest the payment difference each month and have the financial literacy to manage a portfolio over decades. If you earn above the higher rate tax threshold of £50,270 and max out your ISA allowance annually, you have the profile.
• Buy-to-let landlords where interest-only is standard practice and the rental yield covers the interest payments comfortably. The property itself is the repayment strategy.
• Borrowers with a defined exit — for example, someone five years from a large pension lump sum or the sale of another asset, who wants lower payments in the interim.
• Wealthy borrowers who could repay the mortgage tomorrow but choose to keep capital deployed in higher-returning investments.

Poor candidates:

• First-time buyers stretching to afford a property. Interest-only is not a way to buy a home you cannot truly afford. See our first-time buyer guide for realistic budgeting.
• Anyone without a concrete, funded repayment plan. "House prices will go up" is not a strategy.
• Borrowers who would spend the payment difference rather than invest it. Be honest with yourself here.
• Those approaching retirement without substantial other assets. The last thing you want in retirement is a six-figure debt hanging over you.

This article is for informational purposes only and does not constitute financial advice. You should seek independent financial advice before making any investment decisions.