Buyers often assume factors like their credit score, income, or savings will be their biggest obstacle to mortgage approval. The reality for many is that their car payment is the bigger issue.
If you plan to buy in Indiana within the next 6 to 18 months, you have to understand how auto loan debt affects your debt-to-income (DTI) ratio. Getting ahead of it before you fill out an application can make a real difference.
Auto loan payments count directly against your debt-to-income ratio, which lenders use to decide how much home you can qualify for. A single high car payment, or a co-signed loan, can shrink your buying power far more than most buyers expect. Catching this early and building a focused paydown plan are key to staying on track and avoiding surprises at closing.
How 84-Month Auto Loans Changed the Mortgage Equation
The standard auto loan used to run 60 months. Today, 84-month financing has become routine at dealerships across the country.
Lenders stretched the term to lower the monthly payment and make expensive vehicles feel more affordable. Even a lower payment on a seven-year note still counts when a lender calculates your DTI under Fannie Mae’s qualifying guidelines.
Your DTI is the ratio of your total monthly debt obligations to your gross monthly income. Every loan payment you carry is counted, including student loans, credit card bills, and car loans. Once your DTI exceeds the program limit, the mortgage simply does not work. Your income and savings cannot override that ceiling.
A $600 car payment can meaningfully shrink the home price you qualify for. Two car payments can take a buyer who looks ready and push them to the sidelines. That holds even if you only co-signed someone else’s car loan. The math does not bend.
What the Mortgage Desk Is Seeing Right Now
The $1,000-plus monthly car payment has shifted from a rare exception to a regular feature on Indiana mortgage applications. A borrower who planned to purchase in Fishers or Westfield instead discovers the car is standing in the way. The story plays out the same way again and again.
Here is what that looks like in practice. A borrower with an $800 car payment cannot buy the home they planned on. A father co-signing a $300 loan for his daughter may not realize that $300 now sits on his DTI alongside his own $600 payment. The combination may price him out of the home he is trying to build.
Tevis Durbin has worked through this exact scenario with Indiana buyers for over two decades.
“We’ve got a guy right now that’s trying to build a house, and he’s got a $600 car payment, and he signed for his daughter for a $300 car payment. That’s $1,000. It’s probably going to keep him from building. Or it’s going to make him drop his price point significantly.” – Tevis Durbin, Producing Branch Manager (NMLS #424899)
Co-signed debt counts as your debt. If your name is on the loan, the monthly payment appears on your DTI.
The Paydown Sequence That Maximizes Buying Power
This is where the conversation turns practical for anyone planning to purchase in the next 12 to 18 months. Most people assume paying off the highest-interest debt first is always the right move. From a pure financial planning standpoint, that logic holds. The goal of maximizing mortgage buying power calls for a different sequence.
The question is not which debt costs the most. You need to ask which payment frees up the most qualifying room per dollar spent. Tevis Durbin walks Indiana buyers through this calculation regularly, and the approach is specific.
“If our number one goal is to increase your buying power, then our first step is to pay off debt that’s got the biggest payment and the smallest balance. We want to find the biggest payments first, then sort those based off the smallest balance. We knock one off, go to the next one, and go to the next one. That’s the plan of attack if our sole focus is buying power.” – Tevis Durbin, Producing Branch Manager (NMLS #424899)
Eliminating a $400 monthly payment from your DTI frees up more qualifying room than chipping away at a large-balance debt with a smaller payment. Every obligation that disappears from your profile increases what you can borrow.
Getting Ahead of DTI Before You Apply
The good news is that auto debt is a solvable problem when you catch it early. Waiting until you are under contract is where buyers get hurt. By then, options are limited, and the pressure is high.
The better path is a planning conversation 6 to 18 months before you want to close. That runway gives you room to map the exact paydown sequence that unlocks your maximum buying power. It also lets you identify whether a co-signed obligation needs to be addressed. You get a realistic picture of what you qualify for today versus after a focused plan.
The CFPB’s mortgage resources provide a good overview of how DTI factors into lenders’ decisions, though specifics vary by loan program. Conventional loans typically allow a maximum DTI of 45 to 50 percent with strong compensating factors. FHA loans can accommodate higher ratios in certain situations. Understanding your ceiling requires running your numbers against the program you will actually use.
Common Questions About Car Payments and Mortgage Approval
Does a car payment affect mortgage approval even with good credit?
Yes, directly. Credit score and DTI are separate calculations, and a strong score does not offset a high car payment. Lenders evaluate your debt-to-income ratio independently to determine how much payment you can carry on a mortgage. A high auto payment can reduce your approved loan amount or disqualify a purchase entirely, regardless of your credit score. This is one of the most common surprises buyers encounter early in the process.
What if I co-signed on someone else’s auto loan?
If your name appears on a loan, the monthly payment counts in your DTI, regardless of who actually makes the payment. There is one narrow exception. If you can document 12 consecutive months showing the primary borrower has made every payment independently, some loan programs allow the obligation to be excluded. Ask your mortgage advisor whether that documentation pathway applies to your situation before assuming you are in the clear.
How is the debt-to-income ratio calculated for mortgage qualification?
Lenders divide your total monthly debt obligations by your gross monthly income. That includes auto loans, student loans, minimum credit card payments, any installment debt, and the proposed new mortgage payment. The result is your DTI percentage. Conventional loans typically cap at 45 to 50 percent, depending on compensating factors such as reserves and credit score.
What makes the payoff-order strategy different from standard financial advice?
Standard financial advice prioritizes high-interest debt to minimize total interest paid over time. The mortgage buying power strategy prioritizes debts with the largest monthly payment and the smallest remaining balance. The goal is not to save the most money in the long term. You’re trying to remove monthly payment obligations from your DTI as efficiently as possible. A $3,000 balance with a $400 payment helps your qualification more than a $12,000 balance with a $280 payment, even at a higher rate.
Should I pay off my car loan in full before applying for a mortgage?
Not necessarily. Paying off your car may deplete the reserves you need for a down payment or closing costs, which creates a different problem. A mortgage advisor can run the numbers to determine whether a full payoff, a partial paydown, or a different sequence makes more sense. The right answer depends on your timeline and loan program.
How far in advance should I talk to a mortgage advisor about auto debt?
12 to 18 months gives you a meaningful runway to adjust your debt profile, build reserves, and improve your qualifying position before you apply. Even six months can make a significant difference with a clear plan in place. A single planning conversation now prevents expensive surprises when you are ready to write an offer.
Can trading down to a less expensive car solve a DTI problem faster than paying it off?
Sometimes, but it depends on the transaction. If you trade down and eliminate the loan, the payment disappears from your DTI. If you trade in and still carry a smaller loan balance, you may reduce your monthly payment without fully removing the obligation. The impact on your DTI depends on the new payment amount, not just whether you own a less expensive car. A mortgage advisor can model both scenarios against your numbers before you make a vehicle decision you might regret.
Auto Debt Is Solvable When You Plan For It
Auto debt is a real obstacle for Indiana buyers right now, but it is solvable. The gap between buyers who get stuck and buyers who close almost always comes down to timing. Catch it early, build the right paydown sequence, and the math starts working for you instead of against you.
Our team works through this kind of planning conversation with Indiana buyers every week. Your car payment, or a loan you co-signed, might be standing between you and approval. The right move is to find out now rather than at the closing table. Start the conversation with the team at Supreme Lending and get a clear picture of where you stand.
ABOUT THE EXPERT
Tevis Durbin (NMLS #424899) is a Producing Branch Manager at Supreme Lending with over 26 years of experience in the mortgage industry. Leading “The Durbin Team,” Tevis combines his deep financial background – holding an MBA in Finance and a degree in Economics – with specialized loan programs to help Midwest homebuyers navigate complex markets. He is a Certified Mortgage Advisor, serves on the State Board for the Mortgage Bankers of Indiana, and acts as the Communication Chair for the Hamilton County division of MIBOR.