Interest-Only Mortgages in 2025: Smart Uses and Risks Explained

23 July 2025

What Is an Interest-Only Mortgage?

An interest-only mortgage allows the borrower to pay just the interest on the loan each month, without repaying the capital until the end of the mortgage term. It differs from a repayment mortgage, where both capital and interest are paid monthly.


The appeal? Lower monthly payments and cash flow flexibility. But there's a catch: you need a clear plan to repay the loan at term-end.


Who Uses Interest-Only Mortgages in 2025?


These are no longer limited to buy-to-let investors. We’re seeing a growing number of:


  • High-net-worth individuals using interest-only to manage liquidity
  • Property developers refinancing bridging loans or rolling into development exit finance
  • Later life borrowers using downsizing or investment portfolios as a repayment strategy
  • Professionals expecting bonuses or liquidity events (e.g., business exits)


Key Benefits in 2025


Improved Cash Flow
Interest-only frees up income for other investments, expenses, or working capital.


Flexibility on Timing
Ideal if you expect to sell the property or another asset in the next 2–5 years.


Tax Efficiency for Investors
In SPV structures, interest is often fully deductible, reducing corporation tax.


Better Leverage for Growth
Can help portfolio landlords gear up for further purchases, especially in a rising market.


But It’s Not Right for Everyone…


There are risks and drawbacks that need careful planning:


No Equity Built Through Repayments
Unless the property appreciates or you overpay, you’re not reducing the loan balance.


End-of-Term Risk
If your repayment strategy fails (e.g., sale falls through or investments underperform), refinancing may be harder—especially with age or market changes.


Stricter Affordability Criteria
Some lenders stress-test interest-only repayments more tightly than full repayment products.


What Do Lenders Expect in 2025?


You’ll need to demonstrate:


  • A credible repayment vehicle (sale of property, investments, pension lump sum, etc.)
  • Strong income or asset profile—especially if borrowing into retirement
  • Property value stability or growth potential
  • Lower loan-to-value ratios (most lenders cap at 50–75% depending on circumstances)


Popular Uses We’re Seeing at Willow


  • Equity Release for Investment: HNW clients refinancing with interest-only to access equity for other opportunities
  • Development Exit Strategy: Using interest-only to exit a bridge and hold the asset until the optimal sale date
  • Inheritance Planning: Families using interest-only borrowing against an estate asset to manage IHT liabilities
  • London Professionals: High earners using interest-only with bonuses or vesting shares earmarked for repayment


Exit Strategy Matters Most


An interest-only mortgage isn’t just about affordability—it’s about strategy.


Before applying, ask yourself:


  • When will I repay the capital?
  • Will my property likely retain or increase in value?
  • Do I have other assets or liquidity available?
  • Will I still be eligible to refinance at the end of the term?


Final Thoughts


In the right hands, interest-only can be a powerful tool—but it requires planning, discipline, and the right lender.

At Willow Private Finance, we help clients structure interest-only deals that align with their long-term goals—whether it’s wealth growth, tax optimisation, or succession planning.


📞 Want Help Navigating Today’s Market?


Book a free strategy call with one of our mortgage specialists.


We’ll help you find the smartest way forward—whatever rates do next.


Contact Us

23 July 2025
London’s prime residential market – the high-end, luxury housing segment in prestigious postcodes – has evolved notably in the few months since our April update. Cautious optimism at the start of 2025 has given way to clearer signals of a market finding its footing amid persistent headwinds. Prices in Prime Central London (PCL) have softened a bit further, while Prime Outer London (POL) remains comparatively resilient. Buyer demand is still subdued but shows early signs of revival , aided by stabilising financial conditions. Meanwhile, policy changes and taxes introduced earlier in the year are still filtering through and influencing behavior on both the buy and sell side. What’s Changed Since April? Prices & Values: Prime Central London prices are down slightly more year-on-year (around -3% to -4% now, vs ~-1% in Q1), reflecting continued adjustment. In contrast, prime outer districts are flat to modestly up year-on-year (0% overall, with some areas +1–3%). PCL values now sit roughly 22% below their 2014 peak in nominal terms, marking the best value in over a decade. Sales Activity: Transaction volumes remain low – the number of prime sales in H1 2025 was about 6–7% below the same period in 2024. June in particular saw 27% fewer sales than June 2024. However, buyer activity is picking up beneath the surface: properties going “under offer” rose ~9% year-on-year in June, indicating more deals are in the pipeline for Q3. Supply & Negotiations: Supply has increased further. New prime listings in Q2 were ~ 14–19% higher annually, and total available stock is up over 13% vs last year. Many sellers have responded to slow markets by cutting asking prices – about 41% of prime properties sold in June had a prior price reduction, and the average discount to initial asking is ~8%. Serious sellers are accepting the new reality: Knight Frank reports that those who have had properties listed for 6–12 months are making double-digit price reductions to get deals done. This negotiability has put discerning buyers in a stronger position. Policy Impact: Government policy moves in early 2025 have started to bite. In April , the stamp duty surcharge on second homes and investment properties was raised from 3% to 5% , which further dampened investor demand in April/May. Meanwhile, the “non-dom” tax reforms (which limit time under the old regime and impose UK inheritance tax on worldwide assets for long-term non-domiciled residents) are contributing to an exodus of some overseas owners . Prime market analysts tie the sluggish sales in central London partly to these fiscal changes, as some international investors either pause new purchases or even sell assets in light of less favorable UK tax treatment. Financing Environment: A major shift since spring is the turn in interest rate trends. The Bank of England cut rates in May (by 0.25%, to a 4.25% base rate) and then held rates steady in June. This policy pivot, reflecting easing inflation, has begun to reduce mortgage costs for high-end buyers. Lenders have started trimming mortgage rates; indeed, by early July several major banks were offering 5-year fixed deals below 4% for low-risk, affluent borrowers. The era of relentless rate hikes has likely peaked , and banks are now “vying for business as borrowing costs drift lower”. While prime buyers often have significant cash, the improved credit conditions (and some lenders’ willingness to stretch loan-to-income ratios for top earners) are boosting confidence for those who do require financing. (For more on securing large or complex-property mortgages in 2025’s climate, see our recent guides on High-Net-Worth Mortgages and Financing Luxury Property - https://www.willowprivatefinance.co.uk/private-client-finance-in-2025-tailored-lending-for-complex-profiles.) In summary, London’s prime market finished Q2 2025 on a sluggish but stabilising note. Next, we dive deeper into the latest price trends, buyer/seller behavior, and what to expect as we head into late 2025.
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