Mortgage Affordability Calculator
Before house hunting, you need to know how much a lender will actually offer. UK mortgage affordability depends on your income, outgoings, and whether you can still afford payments if rates rise.
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A common mistake is assuming you can borrow based on income alone. Lenders stress-test your ability to pay at higher rates – often 6-8%. High credit card balances, car loans, or childcare costs all reduce your borrowing capacity.
Understanding your realistic borrowing limit before viewing properties saves disappointment. Enter your income and outgoings below to estimate what lenders are likely to offer you.
Your Details
Include loans, childcare, credit cards, car finance
Most lenders offer 4-4.5x, some up to 5.5x
Lenders test affordability at higher rates
Affordability Estimate
Maximum Mortgage
£0
Estimated Property Price
£0
With 10% deposit (£0)
Monthly Payment (at stress rate)
£0
Tested at 7% over 25 years
Debt-to-Income Ratio
0%
Important Notes
- • This is an estimate based on typical lender criteria
- • Actual borrowing depends on credit history and lender assessment
- • Some lenders may offer higher multiples for certain professions
- • Individual circumstances will affect final approval
What lenders will actually offer you
Most UK lenders cap borrowing at 4–4.5x your gross annual income, but the figure they'll actually offer depends on your monthly outgoings, credit commitments, and a stress test at higher rates (typically 6–8%).
A common shock: high credit card balances, car finance, or childcare can knock £20,000–£60,000 off your maximum loan. Before viewing properties, pay down short-term debt where possible and check your credit score. Once you have your borrowing limit, use the Stamp Duty and Cost of Buying calculators to size up your full upfront budget.
Understanding Mortgage Affordability
Mortgage affordability determines how much a lender is willing to let you borrow. It's not just about your income—lenders consider your entire financial picture, including existing debts, monthly outgoings, and future financial stability.
Income Multiples Explained
The income multiple is the main factor in calculating maximum borrowing. Most UK lenders offer between 4 and 4.5 times your annual gross income. For joint applications, both incomes are typically combined before applying the multiple.
Some lenders offer enhanced multiples (up to 5.5x) for:
- Higher earners (typically £50,000+ individual income)
- Certain professions (doctors, solicitors, accountants)
- First-time buyers with specific deposit levels
- Those with minimal existing debts
Why Lenders Use Stress Testing
Since 2014, the FCA requires lenders to stress test mortgage applications. This means checking you can afford repayments not just at today's rates, but at significantly higher rates—typically 6-8%. This protects borrowers from overextending themselves and reduces the risk of repossession if rates rise.
Affordability vs Approval
Affordability is a mathematical calculation based on income and outgoings. Approval is the lender's final decision, which also considers:
- Credit history and score
- Employment status and stability
- Property type and condition
- Deposit source (gifted vs saved)
- Age and remaining working years
You might pass affordability checks but still be declined, or vice versa. This calculator estimates affordability only—actual approval requires a full lender assessment.
Frequently Asked Questions
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