Jack Tools

Borrowing Power Calculator

Estimate how much you may be able to borrow based on income, joint income, monthly commitments, deposit, and lender income multiples.

Enter your details

£
£
£
£
4.5x

This is a guide only. Real lenders also assess credit history, regular spending, dependants, employment type, deposit size and affordability stress testing before confirming how much you can borrow.

Estimated maximum borrowing
£0.00
Estimated property budget: £0.00
Combined income
£0.00
Income multiple used
0.0x
Debt adjustment
£0.00
Estimated budget
£0.00

Borrowing breakdown

Your income £0.00
Second income £0.00
Monthly commitments £0.00
Deposit £0.00

How This Borrowing Power Calculator Works

This borrowing power calculator gives you a quick estimate of how much you may be able to borrow for a mortgage based on your income, a second applicant’s income, your monthly commitments and the income multiple you choose.

It begins by combining both annual incomes and applying an income multiple such as 4.0x, 4.5x or 5.0x. This mirrors the way many people first estimate mortgage borrowing before a lender carries out full affordability checks.

The calculator then applies a simple reduction for monthly commitments and adds your deposit to show an estimated property budget. This helps you compare the likely maximum mortgage with the total amount you may be able to spend on a home.

It is designed as a practical starting point for buyers who want a fast borrowing estimate before speaking to a broker or lender.

Your income Enter your gross annual salary before tax, pension deductions and other reductions.
Second applicant income Add a second gross annual income if you are applying jointly for a mortgage.
Monthly commitments Include regular payments such as loans, credit cards, car finance or other committed monthly outgoings.
Income multiple This is the rough multiplier used to estimate borrowing power from your combined income.
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Example Borrowing Calculations

Single buyer
Income£45,000
Monthly debt£300
Multiple4.5x
~ £198,900 borrowing
Joint buyers
Combined income£80,000
Monthly debt£400
Multiple4.5x
~ £355,200 borrowing
Higher multiple
Income£60,000
Monthly debt£250
Multiple5.0x
~ £297,000 borrowing
With deposit
Borrowing£198,900
Deposit£40,000
Total budgetEstimate
~ £238,900 budget

Borrowing Calculator FAQs

Many lenders use income multiples as a starting point when estimating mortgage borrowing, often around four to four-and-a-half times annual income. Some applicants may be offered more or less depending on affordability, credit profile, deposit and lender policy.
Your deposit does not always increase the lender’s maximum mortgage directly, but it does increase your total buying budget and can improve your loan-to-value position, which may help you access better mortgage rates.
Yes. Existing commitments such as loans, credit cards, car finance and similar payments can reduce how much a lender is willing to offer because they affect your affordability and disposable income.
No. This is a simplified borrowing estimate. A real lender will usually assess your income details, spending, employment type, credit history, dependants, deposit size and stress testing before making a formal mortgage offer.
This calculator is designed for gross annual income, which means income before tax and other deductions are taken off.
Often yes, because the combined income can support a larger mortgage. However, the final result still depends on both applicants’ commitments, credit history, employment details and the lender’s affordability assessment.

Related tools

House Affordability Calculator Estimate a realistic home buying budget. Mortgage Calculator Turn an estimated loan into monthly repayments. Stamp Duty Calculator Check the extra tax cost on a property purchase.