Even with a strong salary and an excellent credit score, a new car loan or a deferred student loan can drastically reduce your homebuying power. When you apply for a mortgage in 2026, lenders don’t just look at how much money you make—they look at how much of that income is already spoken for by other debts.
This measurement is known as your Debt-to-Income (DTI) ratio. Here is exactly how your existing monthly payments impact your mortgage approval and what you need to know before you start house hunting.
The DTI Basics
Your “back-end” DTI is the most critical metric lenders use. It is calculated by taking your proposed new housing payment (principal, interest, taxes, insurance) plus all required minimum monthly debt payments, and dividing that total by your gross monthly income.
- Conventional Loans: Typically capped at 45%, though borrowers with exceptional credit and significant cash reserves can sometimes push to 50%.
- FHA Loans: The standard benchmark is 43%, but FHA is notoriously flexible and can allow up to 50% with strong compensating factors.
- VA Loans: The benchmark is 41%, though VA lenders heavily factor in “residual income” rather than a strict DTI ceiling.
If your DTI exceeds these limits, you will need to either pay down debt, increase your income, or look for a lower-priced home.
The Student Loan Factor
When it comes to student loans, lenders care far more about your monthly payment than your total outstanding balance.
- Income-Driven Repayment (IDR): If you are on an IDR plan, conventional lenders will generally allow you to use that lower, documented payment for your DTI calculation.
- Deferment and Forbearance: If your loans are paused, you are not off the hook. Fannie Mae guidelines require lenders to calculate a payment—often 1% of the outstanding loan balance or a fully amortized payment based on the terms.
- Default: Borrowers currently in default on federal student loans are generally ineligible for most mortgage programs until the default is resolved through rehabilitation or consolidation.
The Car Payment Squeeze
Car payments are a massive hurdle for modern homebuyers. A $700 monthly car payment eats directly into your housing budget dollar-for-dollar.
- The 10-Month Rule: If you have an installment auto loan with 10 or fewer scheduled payments remaining, underwriters may be able to exclude it from your DTI entirely.
- Auto Leases: Unlike standard auto loans, lease payments are always included in your DTI, regardless of how few payments are left on the contract. Lenders assume you will need to lease or buy another vehicle once the term ends.
The Bottom Line: Before you start touring homes, get a clear picture of your DTI. Holding off on financing a new car or strategically restructuring your student loan repayment plan can be the difference between getting approved for your dream home or getting denied.
(Disclaimer: Lending guidelines change frequently and vary by institution. This article is for informational purposes and does not constitute financial or legal advice.)
Ready to find out exactly how much home you can afford? Navigating DTI, loans, and mortgage approvals doesn’t have to be overwhelming. Whether you are ready to buy today or just putting a plan together for the future, the Parm Atwal Real Estate Team is here to guide you every step of the way. We can connect you with our trusted lending partners to review your numbers and get you on the path to homeownership.
Call us today at 916-668-6250 to start your Greater Sacramento home search!
