Different types of debt affect your mortgage approval in different ways because underwriters count each debt by a specific rule, not by the total balance you owe. A credit card, an auto loan, a student loan, and a car lease with three months remaining are all treated differently when a lender calculates your debt-to-income ratio, which means two borrowers carrying identical total debt can qualify for very different loan amounts. Knowing which debts count against you, which can be excluded, and which rules shift depending on your loan program is often the difference between closing on the home you want and being told to try again next year.
How Lenders Actually Measure Your Debt
Your debt-to-income ratio, or DTI, is the number that decides most of this. It compares your total monthly debt payments to your gross monthly income before taxes. If you earn $8,000 a month and your monthly obligations total $2,800, your DTI is 35 percent.
Monthly Payments Matter More Than Balances
Here is the part that surprises most borrowers: your balance is nearly irrelevant. A $40,000 auto loan at $550 a month hurts your qualification more than a $90,000 student loan on an income-driven plan at $120 a month. Underwriting is a cash flow test, not a net worth test. It asks a single question: whether you can make the payment every month alongside everything else you already owe.
Every Debt Type Has Its Own Counting Rule
This is where competitors oversimplify. Lenders do not lump your debts together and eyeball the total. Fannie Mae's Selling Guide devotes an entire section to monthly debt obligations, treating revolving accounts, installment loans, leases, student loans, garnishments, and asset-secured loans under separate rules. The rest of this article walks through those rules the way an underwriter applies them.
Revolving Debt: Credit Cards and Lines of Credit
Revolving debt lets you borrow repeatedly up to a limit. Credit cards, store cards, and personal lines of credit all qualify. Because these accounts stay open indefinitely, lenders treat them as long-term obligations no matter how close you are to paying them off.
How Credit Card Minimums Get Counted
Lenders use the minimum payment listed on your credit report. If no minimum payment appears and you cannot document a lower figure, the underwriter must use 5 percent of the outstanding balance. On an $8,000 balance with no reported minimum, that becomes a $400 monthly obligation instead of the roughly $200 you actually pay. Getting the correct payment documented can recover meaningful borrowing power.
Accounts where you are only an authorized user still count against you. That surprises borrowers who were added to a parent's card years ago and forgot about it.
Charge Accounts That Do Not Count
Open 30-day charge accounts, the kind that require the full balance to be paid every month, are not required to be included in your DTI at all under conventional guidelines. If you run business expenses through a charge card and pay it off monthly, that balance may not hurt you the way a revolving card would.
Installment Debt: Auto Loans, Personal Loans, and Timeshares
Installment debt is a fixed sum repaid over a set term. Car loans, personal loans, and timeshares fall here. Timeshares count as installment debt even when they show up on your credit report as a mortgage.
The 10-Month Rule That Can Erase a Car Payment
Conventional guidelines require installment debt to be counted only when more than 10 monthly payments remain. If your auto loan has eight payments left, that $550 disappears from your ratio. On $8,000 of monthly income, removing $550 drops your DTI by nearly 7 points, which can move a borderline file into approval territory.
This is the single most actionable rule in mortgage qualification, and most articles on debt never mention it.
Where Conventional and FHA Rules Diverge
The programs do not handle this identically, and the difference is expensive if you get it wrong.
Under conventional guidelines, you can pay an installment loan down to 10 or fewer remaining payments and have it excluded. FHA does not allow that. FHA requires that the debt genuinely pay off within 10 months on its existing schedule, and it adds a second condition: the combined payments on all such short-term debts must total no more than 5 percent of your gross monthly income. Making a lump-sum prepayment specifically to reach the 10-month mark is not permitted on an FHA file.
Revolving accounts follow a friendlier rule. If you pay a credit card balance off at or before closing, the payment can be excluded from your DTI, and you do not have to close the account to get that treatment.
Student Loans Follow Their Own Playbook
Student debt is the most misunderstood category, largely because the rules changed and most published guidance never caught up.
If your credit report shows a monthly payment, the lender uses it. That includes income-driven repayment amounts, even when the payment is far too small to amortize the balance—a documented $150 payment on a $100,000 balance counts as $150.
The complication arrives when the report shows $0. On a conventional loan, an underwriter can qualify you at $0 if you document that your income-driven plan genuinely requires no payment. For loans in deferment or forbearance, the lender must instead use 1 percent of the outstanding balance or a documented fully amortizing payment. FHA and Freddie Mac use 0.5 percent of the balance in that situation.
That gap matters. On a $60,000 deferred balance, conventional underwriting may assign $600 a month while FHA assigns $300. For a borrower sitting near the DTI ceiling, program selection alone can decide the outcome. This is exactly the kind of situation where working with a broker who can place your file across multiple programs pays for itself.
Debt That Does Not Count Against You
Several obligations sit on your credit report but never reach your ratio.
Loans Secured by Your Own Assets
If you borrowed against a 401(k), an IRA, a certificate of deposit, or a life insurance policy, that payment is generally not counted as a recurring monthly obligation, provided you can produce the loan instrument showing the asset as collateral. Borrowers routinely pay off 401(k) loans before applying when they did not need to.
Debts Someone Else Actually Pays
If your name is on a loan another person repays, that payment can be excluded. You need 12 months of canceled checks or bank statements from the other party showing an unbroken, on-time payment history. This works for co-signed auto loans, student loans, and even authorized user accounts. It does not work if the payer is involved in your transaction, such as the seller or your agent.
Self-employed borrowers get a parallel provision. Business debt appearing on your personal credit report can be excluded with 12 months of canceled company checks, no delinquency history, and a cash flow analysis that already accounts for the expense. Learn more about CPA letters for self-employed mortgage applicants.
The Lease Exception Almost Everyone Misses
Lease payments count regardless of how many months remain. A car lease with two payments left still counts in full. The logic is that leases almost always roll into another lease or a purchase, so the obligation is treated as permanent. If you were counting on a nearly expired lease to fall off your ratio the way a car loan would, it will not.
How Much Debt Is Too Much
The ceiling depends on your program. Conventional loans through automated underwriting commonly approve to about 45 percent and can stretch toward 50 percent with strong compensating factors. FHA publishes a 43 percent guideline but approves considerably higher through its automated scorecard, reaching into the mid-50s when reserves and credit support the file. VA uses 41 percent as a reference point while leaning on a residual income test, which is why VA borrowers frequently clear ratios that would sink a conventional application. USDA is the strictest of the group.
Below 36 percent, every program approves you comfortably and prices you best.
Which Debts to Pay Down First
Attack the debts with the worst payment-to-balance ratio. A credit card requiring a $250 minimum on a $5,000 balance costs you far more qualification room per dollar than a $30,000 auto loan at $480. Paying off that card removes $250 from your ratio for $5,000. Paying off the car removes $480 from your ratio or $30,000.
Check remaining terms before you write any checks. If a loan already has 10 or fewer payments left on a conventional file, paying it off buys you nothing you did not already have.
Talk Through Your Actual Numbers
Debt rules reward borrowers who know them and quietly penalize those who do not. Our team brings 85 years of combined lending experience and practices common sense underwriting, which means we look at your full picture and structure the file around the rules that work in your favor rather than plugging numbers into a template.
If you are carrying debt and wondering where you stand, request a quote or contact our team. We will run your real ratios across multiple programs and show you exactly which debts are helping and which are holding you back.