Wreck Your Mortgage Approval

Getting mortgage pre-approved feels like crossing the finish line. In reality, it’s just the beginning. A mortgage pre-approval gives you a green light to start shopping for a home, but that light can still change to yellow – or even red – before closing if your financial situation changes.

Here’s the thing most buyers don’t realize: your mortgage pre-approval is a snapshot of your finances on the day you applied. Underwriters re-verify a lot of that information again right before closing, sometimes as late as a few days out. If anything’s changed in the meantime, that snapshot doesn’t match reality anymore, and that’s when closings get delayed or, worse, fall apart.

The good news is that the most common mortgage pre-approval mistakes are completely avoidable. Once you know what lenders are watching for, it’s much easier to keep your home purchase on track.

#1 Don’t Make Major Purchases.

That new couch, that truck you’ve been eyeing, even 0% financing on a mattress: all of it adds a new monthly obligation to your file. Lenders look at your debt-to-income ratio (your monthly debt payments divided by your monthly income), and a new payment, even a small one, can shift that ratio enough to change your approval. “No payments for 12 months” still counts as debt the moment you sign for it, whether or not a bill shows up yet.

Simple rule: if it requires financing, it waits until after closing.

#2 Don’t open new credit cards.

Every new credit application triggers a hard inquiry and can lower your score slightly, and every new account is new available debt your lender has to factor back in. Store cards are the sneaky one here. Retailers love offering “10% off today” for opening one, and it’s an easy trap to fall into while you’re already thinking about furnishing a new place.

#3 Don’t change jobs without talking to your lender first.

A job change doesn’t automatically sink your loan. Plenty of buyers change jobs mid-process and close just fine. But your lender needs to know before it happens, not after. Some changes (a raise, a lateral move in the same field) are a non-issue. Others (switching from salary to commission, changing industries entirely) can trigger a re-underwrite or ask for additional documentation. A five-minute call before you accept an offer can save weeks of delay later.

#4 Don’t move large amounts of money without paper trail.

Here’s a number worth knowing: Fannie Mae defines a “large deposit” as any single deposit that’s more than 50% of your total monthly qualifying income. Cross that line, gift from family, proceeds from selling a car, a transfer between your own accounts, and your lender will need to see where it came from and confirm it’s been sitting there a while (usually 60 days, sometimes called “sourcing and seasoning”). None of this means the money’s a problem. It means keep your records: screenshots of the transfer, a gift letter, whatever shows the paper trail, before your lender has to ask.

#5 Don’t miss a payment. Any payment.

This is the one that surprises people most, because it feels so small. One late payment, on anything, a credit card, a phone bill, a car payment, can ding your credit score right when your lender is watching it closest. Set up autopay on everything you can while you’re juggling inspections, movers, and paperwork. This is not the season to trust your memory.

#6 Don’t co-sign for anyone.

Co-signing for your kid’s car or a friend’s apartment feels like a favor, not a financial decision. Your lender sees it differently: it’s a new obligation on your credit file, and it counts against your debt-to-income ratio whether or not you ever actually make a payment on it. Save the favor for after you’ve closed.

#7 Don’t spend down your savings.

The down payment isn’t the only number that matters. Earnest money, inspection fees, appraisal costs, closing costs, movers, and the inevitable “the water heater died in week two” expense all come out of the same pool of cash. Keep more in reserve than you think you’ll need. Buyers who spend their cushion right before closing tend to be the ones calling their lender in a panic the week of.

#8 Don’t get emotionally married to a house before it’s actually yours.

This is the one I try to gently warn every buyer about. It’s completely normal to fall for a house, the light in the kitchen, the backyard, the way it just feels right. But inspections, appraisals, financing, and competing offers don’t always cooperate with how much you love a place. Stay excited. Just hold off on picking paint colors until you’re past inspections and solidly on the way to closing. If a deal falls through, there is almost always another house. It rarely feels that way in the moment, but it’s true.

#9 Don’t guess. Ask your lender first.

“Can I buy a car?” “Can I move money between accounts?” “Can I pay off this credit card?” “Can I take a new job?” Every one of these is a five-minute phone call before the fact, or a much longer conversation after the fact if it causes a problem. Lenders would genuinely rather field the boring question upfront than untangle a surprise later.

#10 Don’t forget why you’re doing this.

Just because you’re approved for a certain amount doesn’t mean you have to spend every dollar of it. The healthiest home purchases I see are the ones where buyers leave themselves some breathing room, financially and otherwise, rather than stretching to the absolute ceiling of what they qualify for. A house should make your life better. Leave yourself enough margin to actually enjoy it.

The bottom line

Once you’re pre-approved, your job gets simpler, not harder: keep your finances boring until closing day. No new debt, no missed payments, no big unexplained deposits, and no major decisions without a quick call to your lender first.

If you’re buying a home in the Tulsa area, my Buying a Home guide walks you through the entire process, from getting pre-approved to closing day, and answers many of the questions first-time and experienced buyers ask along the way. It’s a great place to understand what comes next and how to avoid common surprises.

And if you’d like a second set of eyes on your finances before or after pre-approval, I’m always happy to help..