Mortgage Affordability Calculator
Get an indicative estimate of how much you could borrow for a mortgage, based on your income and deposit.
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Your estimated borrowing
Three indicative scenarios based on common income multiples lenders use as a starting point. Figures update automatically as you change the details above.
Higher income multiples are not automatically available. The amount a lender may offer depends on your circumstances, affordability assessment and the property.
How much can I borrow for a mortgage?
Most UK lenders start by applying an income multiple to your annual income — commonly around 4 to 4.5 times a single or combined income, with some lenders offering up to 5 times in certain circumstances. This calculator shows all three as separate scenarios so you can see the range, rather than a single figure. Want to see how a specific borrowing amount would actually play out month by month? Use our Mortgage Repayment Schedule Calculator to see your own monthly repayment and full repayment breakdown.
What affects mortgage affordability?
Beyond a simple income multiple, lenders look at your regular outgoings, existing debts and credit commitments, dependants, employment type and history, credit history, and the results of their own affordability stress test — usually checking you could still afford repayments if interest rates rose. Two applicants with identical incomes can be offered very different amounts once these factors are taken into account.
How does a deposit affect the property I could buy?
Your deposit is added to your estimated borrowing to give your indicative property budget — it doesn't usually increase how much a lender is willing to lend based on your income, but it directly increases the price of property you could afford. A larger deposit also reduces your loan-to-value ratio, which can open up more competitive interest rates.
Why lenders may offer less than an income multiple
An income multiple is only ever a starting point. A lender's actual offer comes from a full affordability assessment that weighs your income against your outgoings and circumstances — so the headline multiple shown here is an indicative ceiling, not a guaranteed amount. This is exactly why the figures on this page are described as estimates rather than approvals.
What is the difference between borrowing power and monthly affordability?
Borrowing power is the maximum amount a lender might offer based on income and circumstances; monthly affordability is whether you can comfortably manage the resulting repayment alongside your other spending. A mortgage at the top of your borrowing power isn't necessarily the right choice if it leaves little room in your monthly budget — the illustrative repayments shown for each scenario are there to help you weigh the two against each other.
Frequently asked questions
How much can I borrow on a mortgage?
A common starting point is an income multiple — typically around 4 to 4.5 times your annual income, sometimes up to 5 times for some lenders or circumstances. This calculator shows three indicative scenarios using those multiples, but your actual maximum will depend on a full affordability assessment by a lender.
Can two incomes be used for a mortgage?
Yes — most UK lenders will combine the incomes of joint applicants when working out how much you could borrow together, which is why this calculator includes an optional second applicant income field.
Does a larger deposit mean I can borrow more?
A larger deposit doesn't usually increase the amount a lender will lend based on your income, but it does increase the overall property price you could afford, since your deposit and borrowing are added together to reach your property budget. A larger deposit can also improve the interest rates available to you.
Is this mortgage affordability calculator a lender decision?
No. This is a simple income-multiple estimate for general guidance only — it isn't a lending decision, an affordability approval, a mortgage offer or financial advice. Real lenders also assess your outgoings, credit history, employment and their own affordability checks before confirming what they'll actually lend.
Why might a lender offer less than 4.5 times my income?
Lenders look well beyond a simple income multiple. Regular outgoings, existing debts, dependants, credit history, employment type and the interest rate used in their own affordability stress test can all reduce what they're willing to offer, even if the headline income multiple would suggest a higher figure.