Use this as a planning input only. It is not a lender promise, offer, or approval.
Deducted from the monthly affordability check as a simple planning assumption.
Mortgage affordability calculator
Use a planning multiple alongside a monthly affordability check.
Mortgages
Use a neutral planning multiple alongside an affordability check based on monthly spendable income after commitments.
Indicative planning only. Real mortgage decisions can depend on income band, LTV, applicant type, credit profile, dependants, commitments, and product rules.
Reference borrowing cap
£111,532.50Affordability borrowing cap
£274,054.66Planning max borrowing
£111,532.50Planning max property price
£141,532.50Reference multiple used4.5x
Monthly take-home£1,780.40
Spendable after savings£1,513.34
Available for mortgage after commitments£1,513.34
Estimated monthly payment at planning borrowing£615.89
This tool is a planning estimate only. Real lender decisions can be lower or higher once case-specific underwriting is applied.
The figures you type here stay in your browser: they are not sent to or stored on a server.
Mortgage outputs are indicative only because real lender decisions depend on underwriting, product rules, credit profile, commitments, deposit, and LTV.
Assumptions used here
| Tax/source year | 2026/27 |
|---|
The two affordability tests
Lenders apply two tests, and this tool models both. The first is a cap on the loan itself: lenders set their own income multiples, and the Bank of England's flow limit restricts the share of a lender's new lending that may sit at or above 4.5 times income, which is why quoted multiples cluster near that figure without it being a rule you can rely on. The second is monthly: whether the repayment fits alongside your commitments after tax, usually stressed at a rate above the one you would start on, under the FCA's responsible-lending rules. A large deposit does not fix stretched monthly finances, and a comfortable monthly budget does not raise a loan cap.
What moves the answer most
In rough order of leverage on the outcome:
- Net income drives the monthly test, which is why this tool starts from the same take-home engine as the salary pages rather than a gross multiple alone.
- Committed outgoings count against you at full value: loan repayments, credit-card minimums, childcare and maintenance all reduce what a lender treats as available.
- Deposit size sets the loan-to-value band, and pricing moves in steps at band boundaries.
- Term length trades monthly comfort against total interest, and the repayment tool on this site shows that trade.
- The full affordability calculator states its multiple and stress assumptions on the page, and cites the Bank of England and FCA context they come from.
Frequently asked questions
Does the mortgage tool guarantee what I can borrow?
No. It is a planning estimate only. Lender affordability checks can be lower or higher once full case details are assessed.
Why include income multiples?
Income multiples can help with broad planning, but they are only assumptions and should not be treated as a lender promise, offer, or recommendation.
Last updated 2026-11-01. Maintained by Sean Elsmore. Rates last checked against GOV.UK on 2026-09-02. Estimates are for planning and should be checked against official records where the decision matters.