Mortgage Affordability Calculator UK 2026

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.

Your annual income (before tax) (£)

Partner's income (optional) (£)

Deposit (£)

Monthly debt payments (£)

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.