Property Affordability Is Not the Same as Lender Approval

Affordability is a planning estimate

A calculator can combine income, existing commitments, deposit, interest rate, term and a selected debt-service assumption to produce an indicative range. A lender may apply different affordability rules, verified income, credit checks, product criteria and stress rates. Do not label a planning output as an approval.

The mortgage payment is not the whole home cost

Add maintenance, insurance, service charges, taxes or local fees and other recurring ownership costs. Keep one-off transaction costs separate from the deposit so the cash needed at completion is not understated.

Stress the rate and preserve liquidity

Run a higher-rate case and check what cash remains after the transaction. A household can have substantial home equity while having too little accessible cash for repairs or an income interruption.

Separate household affordability from underwriting

Keep two conclusions on the page: what the household model can sustain under the selected assumptions, and what a lender may independently approve. Do not let an affordability range imply a credit decision. If the rate, term or deposit changes, rerun the household cash-flow test even if the lender's product remains technically available.

Test the cash left after completion

A purchase can fit a monthly mortgage test while leaving too little accessible cash after the deposit and transaction costs. Add the one-off buying costs separately, then examine the remaining liquid buffer and a higher-rate case. That produces a more useful planning boundary than a headline purchase-price multiple on its own.