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How mortgage approval works: what lenders actually check
The approval process demystified: affordability tests, debt-to-income, credit checks, stress test
Mortgage approval feels like a verdict handed down from a machine, and it is close to that — a documented checklist with regulated arithmetic behind each item. Knowing the checklist in advance turns approval from an anxiety into a preparation.
The two questions every lender answers
Every approval reduces to two questions. Can you repay it? — the affordability test. Lenders total your income, subtract your committed outgoings (existing loans, the cards' minimums — the balances the card-interest guide warns about count against you here), apply a floor for living costs, and check the mortgage still fits. Many regulators require a stress test: proving affordability not at today's rate but at a higher one, so a rate rise cannot immediately break you. Will you repay it? — the credit assessment, where your history of meeting commitments does the talking; the credit-scores explainer covers how that record is built and the improvement guide how to strengthen it before applying.
What the lender verifies
Expect documentation, not conversation: payslips or accounts proving income, bank statements showing both the deposit's presence and its provenance (lenders trace large unexplained deposits — a gift needs a paper trail), the property valuation, and identification. Self-employed applicants face the strictest version — typically two or three years of accounts, because variable income is discounted. The loan itself is priced off your loan-to-value, which the LTV explainer covers.
Pre-approval, and the mistakes that break approvals
A pre-approval is a lender's conditional statement of how much it would lend you, based on verified income and credit — worth having before house-hunting because it prices your budget in reality and signals seriousness to sellers. It is conditional: final approval re-checks everything. Which leads to the classic self-inflicted failures, all of them the same error — changing your financial profile mid-application. Opening new credit (even "just a card"), moving large sums without explanation, changing jobs, or missing a single payment between pre-approval and closing can each restart or kill the process. The application period is a few weeks of financial stillness.
The honest summary: approval is not a mystery and not a negotiation — it is arithmetic over documents. Arrive with a clean credit record, a documented deposit, stable income and no new debts, and the machine returns its verdict quickly. Arrive with any of those wobbling and the same machine returns the same verdict in the other direction — so prepare the inputs, and let the checklist work for you.
Sources and further reading
Links were reviewed 2026-09-25. Regulatory permissions, firm status and product terms can change; use the current official register before acting.
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