What is an interest-only loan in the UK?

An interest-only loan requires you to pay only the interest each month. The principal is repaid at the end of the term as a 'balloon payment'. These are common for UK investment properties and buy-to-let mortgages, but also available for residential mortgages with strict criteria.

How do interest-only mortgage payments work in the UK?

Interest-only mortgage payments are calculated as (Loan Amount × Annual Interest Rate) ÷ 12. For example, £200,000 at 4.5% = £750/month interest-only. The full £200,000 remains due at the end of the term. UK lenders require a clear repayment strategy (savings, property sale, investment).

What is a balloon payment?

A balloon payment is the final lump sum payment of the principal at the end of an interest-only loan term. For a £200,000 loan, the balloon payment is £200,000 (the original amount borrowed). You need a repayment strategy: sell property, savings, or refinance to repay.

Are interest-only mortgages still available in the UK?

Yes, interest-only mortgages are available in the UK but with stricter criteria since 2014. Lenders require a clear repayment strategy and higher deposits (often 25-40%). Buy-to-let interest-only mortgages are more common. Residential interest-only is available but limited and strictly regulated.

Interest Only Loan Calculator UK - Monthly Interest & Balloon Payment

Loan Amount	4.0% Monthly	4.5% Monthly	5.0% Monthly
£150,000	£500	£563	£625
£200,000	£667	£750	£833
£250,000	£833	£938	£1,042
£300,000	£1,000	£1,125	£1,250
£400,000	£1,333	£1,500	£1,667

📝 Complete Guide to Interest-Only Loans in the UK

This interest only loan calculator UK helps you understand the costs of interest-only mortgages and loans. Interest-only loans require monthly interest payments only, with the principal due as a balloon payment at the end. They're popular for buy-to-let properties and investment financing.

💰 What is an Interest-Only Loan?

An interest-only loan requires you to pay only the interest each month. Key features:

Monthly Payment: Interest only (no principal repayment)
Balloon Payment: Full principal due at end
Lower Monthly Payments: Than repayment mortgages
Short-term: Typically 5-25 years
Investment Focus: Common for buy-to-let properties

📊 How Interest-Only Loans Work

Interest-only loan calculation:

Monthly Payment: (Loan Amount × Annual Rate) ÷ 12
Example: £200,000 × 4.5% ÷ 12 = £750/month
Total Interest: £750 × 12 × 20 years = £180,000
Balloon Payment: £200,000 (full principal)
Total Cost: £380,000 (£180,000 interest + £200,000 principal)

📈 UK Interest-Only Mortgage Statistics (2026)

25% of UK mortgages are interest-only
Average interest-only mortgage: £180,000
Average rate: 4.5-5.5%
60% of buy-to-let mortgages are interest-only
Average term: 15-20 years
Most common: Landlord/investment properties

🏠 Interest-Only vs Repayment Mortgages

Interest-Only: Lower monthly payments, balloon payment at end
Repayment: Higher monthly payments, no balloon payment
£200,000 at 4.5% for 20 years:
Interest-Only: £750/month, £180,000 interest
Repayment: £1,265/month, £103,600 interest
Interest-only is cheaper monthly but costs more overall

💡 Repayment Strategy for Interest-Only Loans

Property Sale: Sell property to repay principal
Savings/Investments: Regular saving plan
Endowment Policy: Investment to cover balloon
Refinance: Remortgage at end of term
Sale of Other Assets: Use other investments
Inheritance: Family inheritance

⚠️ Important Considerations

Balloon Payment Risk: Need to repay full amount
Interest Rate Changes: Monthly payments can increase
Affordability: Stricter checks since 2014
Property Value: Could fall below loan amount
Retirement: Harder to get interest-only near retirement
Financial Advice: Always consult a mortgage advisor

Interest Only Loan Calculator UK

📊 Loan Details

📊 Cost Breakdown

📊 UK Interest-Only Mortgage Costs