Mortgage affordability calculator

A clearer starting point for your monthly budget.
Check a proposed monthly payment against your budget, then find out what a lender would need to assess.
Mortgage Affordability Calculator

Plan the monthly payment

Check the room in your monthly budget

This simple worksheet shows what is left after the income, household costs, debts and proposed mortgage payment you enter. It does not estimate how much a lender will offer. A lender will assess verified income and spending using its current criteria.

Your monthly budget check

Enter monthly amounts in pounds. Use household money available after tax and business costs, not business turnover or company cash. If income varies, consider a quieter month as well as a typical one.

After tax and business costs.

Food, utilities, childcare, travel and other regular costs; exclude the proposed mortgage payment.

Loans, credit cards, maintenance and other committed payments.

Use a payment from a mortgage illustration or repayment calculator.

The calculation is income minus the three costs entered. It cannot account for every expense, future change, lender stress test or evidence requirement. Your figures stay in this browser and are not sent to Count Ready by this tool.

What the result can and cannot tell you

A useful starting point

See whether a proposed payment leaves a comfortable buffer for costs you have not listed and for months when income is lower.

Not a borrowing limit

A positive balance is not an approval, agreement in principle or lender affordability assessment. A shortfall is a prompt to revisit the figures and get advice.

Self-employed income needs context

Sole traders, partners, directors and contractors may have different income evidence. Start with our self-employed income guide.

Before you seek a mortgage estimate

1. Check your income evidence

Find recent accounts, tax calculations and tax year overviews where relevant. What is needed depends on your structure and the lender. See the proof of earnings guide.

2. Review the full household budget

Include regular commitments, childcare, travel, insurance and a buffer for variable income. Check more than one payment scenario.

3. Discuss your circumstances

Explain your trading history, how you draw income and any recent changes. An adviser can then check current lender criteria and the evidence required.

Mortgage affordability questions

Does this calculator tell me how much I can borrow?

No. It shows a monthly balance based only on the figures you enter. A lender decides what it may lend after assessing verified income, expenditure, credit commitments and its current criteria.

What income should I enter if I am self-employed?

For this personal budget check, enter money realistically available to your household after tax and business costs. Do not enter turnover or assume a lender will use the same figure. See our income assessment guide for how evidence can differ by business structure.

What if my income changes each month?

Try both a typical month and a lower-income month. Include a buffer for irregular expenses. A mortgage adviser can explain what evidence a lender may need and how a change in trading affects the application.

Can I apply if a calculator suggests a shortfall?

A shortfall here is not a lender decision. Check whether any figures were missed or duplicated, consider a different payment scenario and seek advice before making an application.

Need a figure grounded in your circumstances?

Talk through your mortgage options

Tell Count Ready whether you are buying, moving or remortgaging, how you work and what income evidence you have. The team can explain the advice process and check current criteria before you apply. Advice cannot guarantee acceptance.

Request a mortgage conversation