How much could you borrow?

Mortgage Affordability Calculator

A first-pass estimate of how much a UK lender might offer you, using the standard 4.5x income multiple (adjustable), an annualised debt deduction, and a +3% stress test on the implied monthly payment.

Your finances

Your annual income (gross)

Partner's annual income (gross) if applying jointly

Deposit available

Monthly debt payments credit cards, loans, car finance

Assumptions (advanced)

Income multiple

Most UK lenders cap at 4.5x. Some go to 5x or 5.5x for higher earners or specific products.

Assumed interest rate

Assumed term (years)

Max property price you could afford £242,500 £202,500 borrowed + £40,000 deposit

Combined income £45,000

After debt adjustment £45,000

Multiple used 4.5x

Indicative monthly at 5.25% £1,213

Stress test at 8.25% (lender check) £1,597 / month

No existing debt commitments entered. If you have credit-card or loan payments, add them so the figure reflects what lenders will actually offer.

Want to see the full monthly cost? Open the mortgage calculator ›

How lender affordability works

UK mortgage lenders cap borrowing based on income, typically at 4.5x your gross annual income (or 4.5x your combined income if applying jointly). Some lenders stretch to 5x or 5.5x for higher earners, certain professions, or specific products. The default here is 4.5x as that's the most common cap.

Existing debt commitments reduce what you can borrow. Lenders treat your monthly credit card, loan and car-finance payments as ongoing obligations. The model used here subtracts the annualised value of those payments from your income before applying the multiple, which mirrors how most lenders calculate the figure.

The +3% stress test is a regulatory check (FCA / MMR) where the lender asks: "could this borrower still afford the monthly payment if rates rose by 3 percentage points?" The figure shown is the monthly cost at that higher rate, using the same term and loan amount.

What this doesn't include: lender-specific affordability models (some weight dependants, childcare costs, or use a higher cost-of-living deduction), credit scoring, LTV-specific product availability, and any minimum-income thresholds for certain mortgage types. Treat the figure as an upper-bound estimate, not a binding offer.

Once you have a target borrowing figure, use our Mortgage Calculator to see the full monthly cost and interest breakdown, then the Stamp Duty Calculator for tax due at purchase, and the Net Seller Proceeds Calculator if you're moving up from a current home.

Indicative figures only. Real lender decisions weigh credit score, employment type, recent borrowing history and many other factors. For a binding figure, get a Decision in Principle from a broker or lender.