What This Guide Covers
- Which debts count in DTI and which do not
- How to strategically pay down the right debts to get the biggest DTI improvement
- The authorized user trap: when removing an account improves or hurts your position
- Non-taxable income and the gross-up: using income you already have more effectively
What Is Included in the DTI Calculation
Debt-to-income ratio is calculated by dividing total monthly debt obligations by gross monthly income. For mortgage qualification, all minimum monthly payments on all open accounts are included: credit cards (minimum payment), installment loans (car, student, personal), other mortgage payments, child support, and alimony.
Notably absent: utilities, insurance, cell phone, subscriptions, and living expenses. These do not appear on your credit report and are not included in DTI unless they are being used as alternative credit in a manual underwriting scenario.
The target DTI varies by program. Conventional loans typically cap at 45% with standard DU approval, though some borrowers get approved at higher ratios with compensating factors. FHA allows up to 57% in automated approval scenarios with compensating factors. VA does not have a hard DTI cap but monitors residual income.
Front-end DTI is the housing payment divided by income. Back-end DTI includes all monthly obligations. Most programs evaluate back-end DTI as the primary threshold.
Required Documentation
- ✓Current credit report showing all open accounts and minimum payments
- ✓Most recent statements for accounts being paid off or closed
- ✓Documentation of any non-taxable income sources that can be grossed up
- ✓Letter of explanation if any accounts will be closed prior to closing
What Most Lenders Get Wrong
- 1.Not accounting for authorized user accounts that inflate DTI. If the borrower is an authorized user on a high-balance credit card owned by someone else, removing that authorized user status can eliminate that payment from DTI.
- 2.Not identifying non-taxable income gross-up opportunities. Social Security, VA disability, certain pensions, and IHSS income can be grossed up 25%, which directly reduces DTI by increasing qualifying income.
- 3.Recommending paying off student loans without analyzing the cost-benefit. Paying off $1,200 in student loans to eliminate a $150 per month payment costs $1,200 in cash reserves. There are often more efficient ways to move the DTI.
- 4.Missing the installment account close-out strategy. Accounts with 10 or fewer months of payments remaining do not need to be counted in DTI on many loan programs.
The 10-Month Rule: Installment Accounts Near Payoff
Fannie Mae guidelines allow installment loan payments to be excluded from DTI if the account has 10 or fewer months of payments remaining. A borrower with a car loan that has 9 payments left at $450 per month can have that $450 removed from DTI without making any additional payments, as long as the regular payment history is clean.
This is one of the most consistently overlooked DTI improvements in mortgage origination. Before recommending that a borrower pay off a debt, I run the payoff timing: if the account has 11 payments left, it might make sense to pay one extra payment to get under 10 and remove the obligation entirely.
Co-Borrower Addition: When Another Income Source Changes the Math
Adding a co-borrower increases qualifying income and reduces DTI, but it also adds their debts to the calculation. The net effect depends on whether their income-to-debt ratio improves or worsens the combined DTI.
A co-borrower with $4,000 per month in income and $800 per month in debts adds $4,000 to qualifying income and $800 to obligations, a net positive of $3,200 in effective income. A co-borrower with $2,000 per month and $1,800 per month in debts adds only $200 net, which may not be sufficient to justify the additional credit risk they introduce.
For Kern County buyers where a parent wants to help an adult child qualify, the co-borrower analysis must be run before adding them to the application.
Student Loan IBR and How Different Programs Calculate Payments
Student loan debt is one of the most common DTI challenges for Kern County borrowers in their 30s and 40s, and the rules for how student loan payments are counted in DTI vary significantly by loan program.
For conventional Fannie Mae loans: if the borrower is on an income-based repayment (IBR) plan with a documented monthly payment, that payment is counted in DTI. If the payment is $0 due to low income, Fannie Mae requires using 1% of the outstanding balance as the monthly payment, which can dramatically inflate DTI on large balances.
For FHA loans: FHA similarly requires 1% of the outstanding balance if no payment is reflected on the credit report, regardless of the actual IBR amount. If the student loan servicer provides a fully amortized monthly payment amount in writing, FHA allows that figure to be used instead.
For VA loans: VA uses the documented monthly payment if the borrower is making payments. If the student loan is in deferment or forbearance, VA does not require a payment to be counted in many circumstances, which can significantly help VA-eligible borrowers.
Kern County borrowers with large student loan balances on IBR plans may find VA or USDA more favorable than FHA or conventional when the actual IBR payment is significantly below 1% of the balance. Running the analysis across all qualifying programs is essential before deciding which product works best.
DTI optimization is a roadmap problem, not a moral problem. Most borrowers who are told their DTI is too high simply need a clear list of what moves it most efficiently, at the lowest cash cost, in the shortest time. I build that list for every pre-approval that comes back with a DTI issue, because the goal is getting you to the closing table, not telling you no.
Is your DTI too high to qualify? Let Dan build you a specific action plan.
Call Dan at (661) 342-9381. He will review your specific situation and documentation in a free call.