Precision Utility
Mortgage Affordability
Calculator
Income Multiple
4.5x
Stress Test
+3%
Find out how much you could borrow for a UK mortgage and the maximum property price you can afford. Enter your income, partner's income, monthly expenses and deposit — the calculator uses the standard 4.5x income multiple and shows your estimated monthly repayment at current market rates.
Your Details
Max Property Price
£229,500
Max Borrowing
£199,500
Max Property
£229,500
Est. Monthly Payment
£1,107
Loan-to-Value
86.9%
How the mortgage affordability calculator works
Enter your gross annual income and, if applicable, your partner's income. The calculator combines both and applies the standard 4.5x income multiple used by most UK lenders to determine your maximum borrowing amount.
Next, enter your regular monthly expenses — things like credit card payments, car finance, childcare and other committed outgoings. The calculator deducts a portion of these from your borrowing capacity, reflecting how lenders reduce offers based on existing financial commitments.
Finally, add your deposit. This is added on top of the maximum borrowing figure to give you the total property price you could afford. The calculator also estimates your monthly repayment at 4.5% over 25 years and shows your loan-to-value ratio.
The result gives you a realistic starting point for your property search. Actual lending decisions depend on a full affordability assessment by the mortgage provider, including credit checks and stress testing.
What you need to know about mortgage affordability
The 4.5x income rule: Most UK lenders cap borrowing at 4.5 times your gross annual income. Some specialist lenders or professional mortgage products may offer up to 5x or 5.5x for certain professions (doctors, solicitors, accountants), but 4.5x is the standard benchmark used across high-street lenders.
Stress testing: Since the Mortgage Market Review, lenders must stress-test your ability to repay at a rate typically 3 percentage points above the product rate. If you are offered a 4.5% fixed rate, the lender checks you could still afford repayments at 7.5%. This is why the amount you can actually borrow is often lower than the simple income multiple suggests.
Affordability checks:
- Lenders assess both income and expenditure — higher outgoings reduce your maximum borrowing
- Existing debts (credit cards, loans, car finance) directly reduce how much you can borrow
- Childcare costs, school fees and maintenance payments are all factored in
- Your credit score affects not just approval but also the interest rate offered
- Self-employed borrowers typically need 2-3 years of accounts or SA302 forms
This calculator gives an indicative maximum. For a binding decision, speak to a mortgage adviser or apply directly to a lender who will carry out a full affordability assessment.
Frequently asked questions
How much can I borrow for a mortgage in the UK?
Most UK lenders will offer between 4 and 4.5 times your annual income. Some may stretch to 5 or even 5.5 times for high earners or specific professions. This calculator uses the standard 4.5x income multiple, which is the most common cap across major UK lenders.
What is a mortgage affordability check?
A mortgage affordability check is the assessment lenders carry out to ensure you can comfortably afford repayments. They look at your income, regular outgoings, existing debts and living costs. They also stress-test your ability to pay if interest rates rise by around 3 percentage points above the product rate.
Does a joint income increase how much I can borrow?
Yes. When applying with a partner, most lenders combine both incomes and apply the income multiple (typically 4.5x) to the total. For example, two earners on £30,000 each could borrow up to £270,000 before expenses are considered.
What expenses do lenders consider in an affordability assessment?
Lenders look at committed monthly expenditure including credit card payments, loan repayments, childcare costs, car finance, subscriptions and general living costs. Higher monthly outgoings reduce the amount you can borrow, as lenders need to be confident you can meet repayments alongside your existing commitments.
What is mortgage stress testing?
Stress testing checks whether you could still afford repayments if interest rates rose significantly. Lenders typically add around 3% on top of the product rate and recalculate monthly payments at that higher rate. If you could not afford the stressed payment, they may reduce the amount they are willing to lend.
How does my deposit affect what I can afford?
Your deposit is added on top of the maximum borrowing amount to determine the total property price you can afford. A larger deposit means you can look at more expensive properties, reduces your loan-to-value ratio and typically unlocks better interest rates from lenders.