Mortgage Affordability Calculator UK 2026
How much can you borrow for a mortgage? Enter your income, deposit and outgoings to see your maximum mortgage, monthly payments and loan-to-value ratio.
Find out how much you could borrow for a mortgage. Enter your details below for an instant estimate of your maximum loan, monthly payments, and deposit requirements.
How this is calculated
Estimates maximum borrowing at 4.5x combined gross income, reduced by half of annual debt repayments. Monthly payment estimates assume a 25-year term and illustrative rates of 4.5%, 5.0% and 5.5%. Actual lender offers depend on full affordability checks, credit history and stress testing.
How Mortgage Affordability Works
UK lenders typically offer 4–4.5 times your gross annual income as a maximum mortgage amount. For joint applications, most lenders use 4x–4.5x combined income.
Lenders also conduct a detailed affordability assessment that considers:
- Your monthly income (including bonuses, overtime, benefits)
- All monthly outgoings (bills, debts, childcare, living costs)
- Your credit score and history
- The property’s value and condition
- Stress testing against higher interest rates
LTV (Loan-to-Value) Explained
| Deposit | LTV | Impact |
|---|---|---|
| 5% | 95% | Highest rates, limited lenders |
| 10% | 90% | Better rates, most first-time buyers |
| 15% | 85% | Good rates, wider choice |
| 20%+ | 80% | Best rates, lowest costs |
A lower LTV means you have more equity in the property, which lenders reward with better interest rates. Read our guide on how much deposit you need for more detail.
Next Steps
- Read our first-time buyer guide for a complete walkthrough
- Check your credit score before applying
- Compare fixed vs tracker mortgages
- Learn how mortgages work in the UK
Disclaimer: This calculator provides an estimate only. Actual lending decisions depend on a full affordability assessment by the lender. Speak to an FCA-registered mortgage advisor via Unbiased.co.uk for personalised advice.