Mortgage Pre-Approval: What Lenders Actually Check
A pre-approval is a lender's conditional opinion, not a promise — understanding exactly what was checked, and what wasn't, tells you how much weight to put on the letter in your hand.
What a pre-approval is
A pre-approval is a lender (or a broker shopping lenders on your behalf) reviewing your finances and stating the mortgage amount and rate they'd likely offer you, with the rate typically held for a set period, often around 90 to 120 days. It costs nothing, it doesn't commit you to that lender, and it does not guarantee you'll get the mortgage. What it guarantees is that a real person or system has looked at your income, debts and credit before you start making offers — which eliminates the most common and most heartbreaking failure in home buying: finding the home, winning the bidding, and discovering the money isn't there.
What the lender actually checks
- Income and employment. How much you earn, how you earn it, and how stable it looks. Salaried employees are simple; self-employment, commission and contract income require more documentation — typically two years of tax returns and notices of assessment — and are assessed on averages and trends, not your best year.
- Credit history and score. Your score and, just as important, the pattern behind it: late payments, collections, high utilization, a past bankruptcy. Lenders have minimum thresholds, and different lenders read the same file differently.
- Debts and debt ratios. Lenders calculate what share of your gross income goes to housing costs and to all debts — car loans, credit cards, student loans, lines of credit. Those ratios cap the mortgage you qualify for more often than the sticker price of the home does. A modest car payment can quietly erase tens of thousands of dollars of mortgage room.
- Down payment. How much you have, where it's sitting, and where it came from. Lenders verify the source: savings accumulated over time, a documented gift from an immediate family member, or withdrawals under programs like the Home Buyers' Plan and First Home Savings Account. Large unexplained deposits get questions.
The stress test, in plain terms
Every federally regulated lender must check that you could still afford your payments at a higher rate than the one you'll actually pay. As of writing, you qualify at the greater of your contract rate plus 2%, or a federal benchmark floor of 5.25%. On paper you might be shopping with a rate in the 4s; the lender is approving you as if it were in the 6s. The practical result is that the home you can afford under the stress test is meaningfully cheaper than the home you'd qualify for at your real rate. This is deliberate — it's a cushion against rate increases at renewal — but it surprises buyers who calculate affordability from a monthly payment at the advertised rate. Your pre-approval amount already has the stress test baked in. That's one of its most useful features.
What a pre-approval does not do
This is where buyers get hurt, so read it twice. A pre-approval does not approve the property. At final approval, the lender reviews the specific home: its appraised value (which may come in below your purchase price, leaving you to cover the gap in cash), its type and condition, and in the case of condos, sometimes the building itself. A pre-approval also goes stale: lose your job, take on a new car loan, run up credit cards during the house hunt, or let the rate-hold window lapse, and the opinion in your hand may no longer describe your reality. Lenders re-verify at the end. Buyers have lost homes by financing furniture for a house they didn't own yet. Between pre-approval and closing, the correct financial strategy is to change nothing.
How to use one properly
- Get it before you search, and shop within the approved number — not the number you hope stretches.
- Keep your documents current: pay stubs, employment letter, tax documents, down payment statements. Deals move fast; paperwork shouldn't be the slow part.
- Tell your broker about the property before you offer when you can — rural properties, condos with unusual features, and homes with rental or commercial elements can all change a lender's answer.
- Keep a financing condition if there's any daylight between your pre-approval and a final, property-specific approval. A pre-approval plus no condition is a risk you should take deliberately, not by default.
- Ask what happens at renewal of the rate hold if your search runs long, so a lapsed hold never surprises you mid-offer.
Done right, a pre-approval converts the scariest unknown in the process — "will the money be there?" — into a near-certainty, and tells sellers you're a buyer whose offer is built on verified ground. Done casually, it's a letter that means less than it appears to. The difference is in how honestly the homework was done.
Next step
With your number verified, the search gets real — see what your pre-approval actually buys at HomesFound search. If family is helping with the down payment, the gifted down payment rules decide whether that help counts — and if an appraisal later comes in low, this guide's lender relationship is what you'll lean on.