Mortgage Affordability Calculator UK
Estimate how much mortgage and property price may be realistic based on income, deposit, debts, interest rate and term.
Built using real UK scenarios including rent, council tax, bills and everyday expenses.
Estimated maximum loan: £194,701.58 with an approximate monthly payment of £1,033.33 on this simplified model.
Loan and price comparison
Compare the income-based ceiling, the payment-based ceiling, and the combined recommendation.
How this estimate works
The calculator compares two simplified checks and uses the lower result: an income multiple and a monthly affordability budget after debt payments.
- Income multiple starts around 4.5x and reduces if existing monthly debts already take a bigger share of income.
- Monthly affordability uses 28% of gross monthly income as a simple mortgage payment cap before subtracting debts.
- The recommendation is designed to feel more cautious than a headline borrowing figure on its own.
Example calculation
If a household earns £55,000 a year, has a £30,000 deposit and pays £250 a month toward existing debts, this calculator gives a rough borrowing range and a possible property budget. It is useful for planning, not for replacing a lender decision.
Why your real result may differ
- Lenders use their own affordability checks, credit scoring and stress testing rules.
- Deposit size, product type and fixed-rate length can change the lending result.
- Dependants, childcare, travel costs and committed spending may reduce real borrowing power.
- This calculator does not replace a broker, lender decision or formal mortgage illustration.
FAQ
Is this the same as a lender decision?
No. Real lenders also assess credit history, deposit size, dependants, committed spending, stress tests and their own internal rules.
Why use both an income multiple and a payment check?
That gives a more balanced estimate. Some households look fine on income multiple alone but still feel stretched once debts and interest rates are included.
Should I enter household income or just one salary?
Use the total annual gross income you expect to use for the mortgage application if you want a household estimate.
Does deposit size change borrowing as well as property price?
Yes. Deposit mainly changes the property price you may target, and in real life it can also affect lender choice, rate offers and affordability tests.
Why is this only a rough estimate?
Real lenders use their own affordability models, credit checks, stress testing and product rules, so no public calculator can guarantee the same result.
Can I include a second income?
Yes. Add it if you expect a joint application or another household income to be part of the borrowing case.
Useful guidance
Mortgage affordability is not set by one official formula, so these UK guidance pages are more useful here than a single rule source.
Useful background if you want to understand current lender support options and mortgage pressure guidance.
A practical UK guide to affordability, deposits, fees and the wider mortgage process.
Relevant if you are researching safety nets alongside general affordability planning.
Useful next steps
These related tools help once you start comparing mortgage borrowing with monthly living costs.
Useful if you are comparing the monthly cost of renting with a possible mortgage budget.
See your broader pay breakdown if you still need to estimate income after tax and deductions.
Helpful when you want to compare mortgage cost with net monthly income instead of gross salary.
Compare a possible mortgage payment with wider monthly household costs.
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