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You start to fantasize about putting something pretty in your future new garage, even though your mortgage loan hasn’t closed yet. You go out and take out a loan on a sexy red convertible. Oops. Guess what? By buying a car before closing, you might have jeopardized your house loan.
It happens. Mortgage lenders continually tell their borrowers to refrain from getting car loans or any other kind of new credit. That advice covers the time from the home loan application to closing day. After that, you are free to do what you want. Even so, some borrowers just aren’t listening or don’t understand, says Steven Chester. He was a senior mortgage banker at PrimeLending in San Antonio, Texas.
“The whole deal could be denied, and you lose your dream house,” he says.
Check your home buying eligibility. Start here (Nov 8th, 2026)
Can buying a car before closing hurt your mortgage application?
Once you apply for new credit for a car, no matter how small, red flags or red lights start flashing for the home lender.
“We have to answer to the government, to our investors, to state governments and to shareholders,” Chester says. “They are all making sure we are following the law.”
If lenders don’t follow the rules, they are the ones that face fines and can go out of business. It’s really nothing to play around with, he says. As a result, lenders are being more scrupulous. Chester’s business now makes that last check on customers’ credit before the closing, and so do many lending companies across the country.
“Lenders check whether you have taken on any new debt before they fund the loan,” he says. “If it shows you applied for new credit and obtained new credit, it’s game over. It’s beyond trust now.”
Chester explains to all his clients what he looks for as a lender during the loan application period. He wants a financial snapshot of the person he will be lending money to.
“If the borrower goes in and changes that snapshot, then it’s not good. I tell them that the government standards say that we have to treat every loan the same way and every client the same way,” he says.
That means lenders check out every borrower before anyone signs all the papers.
How a new car payment changes your DTI
Chester worked through the days when there was no internet and applications took three hours to complete. Back then, he had to calculate a customer’s debt to income ratio (or DTI) by hand.
Your DTI is still one of the first factors lenders consider in deciding how large a mortgage loan you can qualify for. It is your monthly debt payments, including the new mortgage, divided by your gross monthly income. The old 28/36 guideline, however, is no longer a hard limit. Fannie Mae’s automated underwriting can approve a DTI of up to 50%, and FHA loans also allow ratios above 36%. The limit depends on the loan program and the lender. For more detail, see our guide to debt-to-income ratio.
Buying a car with a new loan before closing adds to that monthly recurring debt. It also messes up the whole DTI your home lender originally worked out. You may have qualified to buy a house that costs a certain price. A new car payment could disqualify you for a house at that price. That, in turn, could disqualify you for the loan you wanted.
What lenders say about replacing a car or paying cash
Of course there are exceptions to the rule, Chester says. For example, a customer might have an accident or a breakdown. In that case, they need to contact their lender to talk about the situation.
It’s all about fiscal responsibility. Say a customer is buying a $60,000 luxury vehicle with cash. At the same time, they are applying for a $500,000 house loan and aren’t putting a large down payment down. The lender will have something to say about that.
On the other hand, you may need to replace a car with a similar auto loan. Lenders probably won’t bat an eye if the new payment is only $50 more a month than the old one, he says.
“There are ignorant borrowers who don’t realize that all of these things are connected, and then there are some with a cavalier attitude,” he says. “My simple message to a customer is that if you had to lend out your own money, what would you like to see from the person borrowing the money? Would you want them to go out and buy a new car while the process is still continuing?”
Check your home buying eligibility. Start here (Nov 8th, 2026)
