- Monthly payment, not balance, is what caps your approval. Lenders score the minimum payment against your income, so a $120 card and a $450 car loan hurt very differently even if the balances look similar.
- Attack the highest payment-to-balance ratio first. The debt that frees the most borrowing power per dollar paid is usually a car loan or a near-payoff installment loan, not a credit card.
- The 10-month rule is free leverage. An installment loan with 10 or fewer payments left can be dropped from your ratios entirely, per Fannie Mae and Freddie Mac.
- Do not drain your down payment or reserves. Paying off debt is the wrong move if it leaves you short of the cash a lender requires to close and hold in reserve.
- Sometimes carrying the debt and buying sooner wins. A home bought this year can appreciate while you wait to become debt-free. Run the tradeoff before you commit the cash.
How lenders actually read your debt
You have some extra cash and a plan to buy a house. The instinct is to knock out a debt, feel lighter, then apply. The problem is that the debt that feels satisfying to erase is rarely the one holding back your approval. Underwriters do not care how many accounts you have or how big a balance looks. They care about one number: the slice of your monthly income already promised to someone else.
That number is your debt-to-income ratio, or DTI. It compares your total monthly debt payments, including the new mortgage, to your gross monthly income. The key word is payments. A $9,000 car loan with a $450 monthly payment damages your ratio far more than a $9,000 student loan on a stretched-out plan at $90 a month, even though you owe the same amount on each.
Those ceilings are what you are working against. According to the Fannie Mae Selling Guide, a conventional loan underwritten by hand caps at 36% total DTI, stretching to 45% with strong credit and reserves, while a file approved through Desktop Underwriter can reach 50%. FHA loans run looser: FHA guidelines set a 31% housing and 43% total benchmark, but automated approvals routinely clear higher when you have cash reserves or a long job history. The 43% figure traces back to the Consumer Financial Protection Bureau's ability-to-repay rule, which made DTI the spine of responsible underwriting.
Here is why this matters for your cash. Every $100 of monthly debt payment you eliminate frees roughly $100 of room for a mortgage payment. At a 6.5% rate, that $100 supports somewhere around $15,000 to $16,000 of additional loan. So the question is never "which debt is biggest?" It is "which payment buys me the most approval per dollar I spend?"
Revolving versus installment: lenders weigh them differently
Your debts fall into two buckets, and underwriting treats them in opposite ways.
Revolving debt (credit cards, lines of credit)
Credit cards count at their minimum monthly payment, which is tiny relative to the balance. A card with a $6,000 balance might show a $120 minimum. That $120 is all that hits your DTI. Paying the whole thing off removes only $120 of monthly obligation, which is a weak return on $6,000 of cash if approval is your goal.
There is a catch that cuts the other way, though. Credit card balances also drive your credit score through utilization, and your score sets your interest rate and your access to that 45% to 50% DTI ceiling. Paying a maxed-out card down below 30% utilization can lift your score fast, and a better score can matter more than the DTI it frees. If you are stuck below the score minimum for your loan, revolving debt jumps the line. Our guide to the credit score you need to buy a house breaks down the thresholds by loan type.
Installment debt (car loans, student loans, personal loans)
Installment loans count at their full fixed payment for as long as the payment schedule runs beyond 10 months. A car loan at $450 a month drags $450 through your DTI every single month until it is gone. That is why a car loan is so often the real ceiling on your approval: a mid-size auto payment can eat 6% to 8% of a middle-income household's gross income by itself.
The quick test: divide each debt's balance by its monthly payment. A low number (a car loan near 20, say) means you are spending a lot of cash to erase a big monthly payment: high leverage. A high number (a credit card near 50, or a 20-year student loan) means the payment is cheap relative to the balance: low leverage for approval.
Know your number before you spend a dollar
A top local agent works backward from your real approved payment, then helps you target homes that fit it. We match you with agents who close with buyers in your exact situation.
Find a top buyer's agentThe 10-month rule: the cheapest win in underwriting
This is the single most overlooked lever, and it can cost you nothing. Both major rulebooks let you exclude a near-payoff installment loan from your ratios without erasing the whole balance.
The Freddie Mac Selling Guide states that installment debt may be left out of the DTI when the file shows 10 or fewer monthly payments remaining. Fannie Mae applies the same treatment for installment and mortgage debts with more than 10 payments left being counted, and short-term ones generally dropped. For conventional loans, you can even pay a loan down to 10 or fewer payments at closing to make it excludable.
Think about what that means in practice. Say your car loan is at $450 a month with 13 payments left, a balance near $5,700. You do not need to pay all $5,700 to get that payment off your ratios. On a conventional loan, paying down roughly three payments, about $1,350, can shrink the schedule to 10 months and let the underwriter drop the full $450 from your DTI. You spent $1,350 and bought back the approval value of a $450 payment.
FHA and USDA work slightly differently. On FHA loans, a short-term debt can usually only be excluded if it already reports 10 or fewer payments when credit is pulled, and the remaining payments total 5% or less of your monthly income. USDA allows paying down to the 10-month mark. Ask your loan officer which rule applies to your program before you move money.
The practical takeaway: before you pay off anything in full, look at every installment loan and ask how close it is to 10 payments. A loan three or four payments from excludable is the best dollar you can spend. A brand-new 60-month car loan is not, because a partial paydown changes your ratios almost not at all.
DTI impact calculator
Enter your income, your current monthly debt payments, and see which payoff frees the most borrowing power. The tool estimates how your maximum loan amount moves when you eliminate each specific debt.
Which Payoff Buys the Most Approval?
Adjust your income, debts, target DTI, and rate. The result tiles show how much your estimated maximum loan rises when each debt disappears.
Estimate for education only. Assumes taxes and insurance consume about 25% of the housing payment and a 30-year term. Your lender's figure will differ based on your exact program, reserves, and credit.
Play with your own numbers and watch the pattern: the debt with the biggest monthly payment almost always produces the biggest jump in approved loan amount, regardless of its balance. That is the whole game.
A step-by-step payoff priority order
Work this list in order. Stop when you run out of cash you can safely spare (more on "safely" in the next section).
Clear anything that blocks approval outright
Collections, charge-offs, judgments, and tax liens often must be resolved before closing no matter what your DTI is. These are not optimization questions. If you have one, it goes first.
Knock near-payoff installment loans under 10 payments
Any installment loan a few payments away from the 10-month line is your cheapest DTI win. Pay it down to excludable (on conventional or USDA) and remove the whole payment for a fraction of the balance.
Pay off the highest-payment installment loan you can fully clear
Usually the car loan. If you have the cash to zero it out, you remove the largest single monthly obligation and buy the most approval per dollar. Only count a payoff you can complete; a partial paydown on a loan with many payments left does nothing for your ratio.
Pay down revolving balances to lift your credit score
If your score is near a cutoff, getting card utilization under 30% (and ideally under 10%) can raise it enough to unlock a lower rate or a higher DTI ceiling. This is a score play, not a DTI play, but it can be worth more than both.
Leave low-payment, long-term debt alone
A stretched student loan at $90 a month or a 0% furniture plan is doing little damage to your ratio. Your cash does more good as down payment or reserves. If student debt is your main concern, our guide to buying a home with student loan debt covers how different programs calculate those payments.
One caution on step 3 and step 4: do not close the accounts after you pay them off unless you have a reason to. A paid-off credit card left open helps your utilization and your average account age. And expect your lender to re-check credit before closing. Fannie Mae's rules allow re-underwriting if new debt shows up, so this is not the moment to finance a couch.
Turn a bigger approval into the right house
Freeing up DTI only helps if you spend it wisely. A performance-matched agent helps you avoid stretching to your ceiling and negotiate a price that actually fits your budget.
Match with a local expertWhen paying off debt is the wrong move
Here is the honest counterpoint the debt-free crowd skips: wiping out debt is not automatically the best use of your cash before a purchase. Sometimes it actively hurts your ability to buy.
You need that cash to close
A mortgage requires a down payment plus closing costs, and many loan programs also require cash reserves left over after closing (often two to six months of housing payments on investment and higher-risk files). If paying off a car loan leaves you short of the down payment, you have traded a DTI problem for a down-payment problem and lost either way. Before you pay anything, pin down your actual cash-to-close, and read our breakdown of how much down payment you really need so you are not solving the wrong constraint.
The math favors buying sooner
Scenario: the $15,000 decision
You have $15,000. Option A: pay off the car, cut your DTI, and wait six months to rebuild the down payment. Option B: keep the car, use the $15,000 toward your down payment, and buy now. If home prices in your area rise even 3% over those six months on a $350,000 home, waiting costs you more than $10,000 in price, plus six months of rent and the chance that rates move against you. Carrying the car payment and buying now can be the cheaper path, as long as your DTI still clears with the debt in place.
This is a real tradeoff, not a slogan. There is no universal answer, because it depends on your local price trend, your rate, and how close your DTI already sits to the ceiling. The point is to run it both ways instead of assuming debt-free is the finish line. If you are weighing timing broadly, our take on whether to buy now or wait digs into the history.
A down payment can also cut your payment
Extra cash toward the down payment lowers your loan amount, which lowers your monthly payment, which lowers your DTI too, just from the other direction. Below 20% down you also pay mortgage insurance, so pushing past that line, or using the cash to avoid a higher-cost structure, can beat debt payoff on pure monthly math. Get a loan officer to model it both ways. A good one will, and getting pre-approved is where this conversation should happen before you commit a dime.
Mistakes that quietly shrink your approval
- Paying off the small card first because it feels good. A $600 card at a $25 minimum barely moves your DTI. The satisfaction is real; the approval gain is not.
- Partially paying down a long car loan. Dropping a 60-month loan from $18,000 to $14,000 leaves the $450 payment unchanged, so your DTI does not budge. Either clear it fully or get it under 10 payments.
- Opening new credit during the process. A new car or financed furniture adds a monthly payment that can blow your DTI and trigger re-underwriting right before closing.
- Emptying savings to be debt-free. A zero-debt borrower with no reserves is weaker than a borrower with a small car payment and three months of cushion. Lenders reward reserves.
- Moving money without a paper trail. Large unexplained deposits or transfers raise underwriting questions. Document every source before you touch the funds.
Frequently asked questions
Should I pay off my car loan before buying a house?
Often yes, because a car loan usually carries one of the largest monthly payments relative to its balance, and that payment is exactly what caps your DTI. But only if you can pay it off in full without draining your down payment or reserves. If it already has 10 or fewer payments left, your lender may be able to exclude it without you paying anything extra.
Is it better to pay off credit cards or save for a down payment?
It depends on your goal. If your credit score is near a cutoff, paying cards down to under 30% utilization can raise your score and unlock a better rate, which may outweigh the down payment. If your score is already strong, the card's small minimum payment does little to your DTI, so the cash often does more good as a down payment or reserves.
What DTI do I need to qualify for a mortgage?
It varies by program. Fannie Mae allows up to 50% on conventional loans run through Desktop Underwriter and 45% on many manually underwritten files. FHA uses a 43% benchmark that can stretch higher with compensating factors like cash reserves. Lower is always safer, and a lower DTI can also improve your pricing.
What is the 10-month rule for installment debt?
Fannie Mae and Freddie Mac let lenders exclude an installment loan from your DTI when 10 or fewer monthly payments remain. On conventional and USDA loans you can even pay the balance down to reach that threshold. FHA is stricter: the loan generally must already report 10 or fewer payments, and the remaining total cannot exceed 5% of your monthly income.
Does paying off debt raise my credit score before a mortgage?
Paying down revolving balances (credit cards) can raise your score quickly by lowering utilization. Paying off an installment loan has a smaller, slower effect on score, though it helps your DTI directly. Do not close old accounts after paying them off, since that can shorten your credit history and raise utilization.
Will my lender check my debt again before closing?
Yes. Lenders commonly re-pull credit shortly before closing. New debt discovered at that point can push your DTI over the limit and trigger re-underwriting or even a denial. Avoid financing anything, opening new cards, or making large purchases until after you have the keys.
How much does eliminating a $100 monthly payment help?
Removing $100 of monthly debt frees roughly $100 of room for a housing payment. At a 6.5% rate, that supports about $15,000 to $16,000 of additional loan amount. That is why the size of the monthly payment, not the balance, is what drives your buying power.
Can I pay off debt at closing instead of before applying?
Sometimes. Fannie Mae allows certain debts to be paid off at or before closing and excluded from your DTI, and revolving accounts paid at closing can be excluded without closing the account. The funds must be verified and documented. Tell your loan officer your plan up front so the file is structured correctly.
The bottom line
Do not pay off the debt that bothers you. Pay off the debt that is capping your approval. For most buyers that means attacking the highest monthly payment relative to its balance, usually a car or personal loan, and using the 10-month rule to retire near-payoff installment debt for pennies on the dollar. Credit card payoffs matter mainly when they rescue your credit score, not your DTI. And before you spend a single dollar, confirm you are not sabotaging the down payment and reserves the loan actually requires. Run both versions of the plan: debt-free-but-later versus more-debt-but-now. Sometimes buying this year with a car payment beats waiting a year to be clean. The right answer is whichever one gets you into the right house on terms you can carry.
Disclaimer: This article is for informational purposes only and should not be considered financial, investment, or legal advice. Figures and rules cited here draw on the Fannie Mae Selling Guide, the Freddie Mac Selling Guide, the Consumer Financial Protection Bureau, and published FHA guidelines; program rules and ceilings change, so confirm current requirements with a licensed loan officer for your specific situation. EffectiveAgents is a real estate agent matching service, not a lender.
