How Student Loans and Other Debts Affect Mortgage Qualification

Jan 14, 2027 · By Oanh Nguyen · Broker & Loan Officer · Home Loans

Many Bay Area buyers carry some debt: student loans, a car payment, credit cards or a personal loan. That doesn't mean you can't buy a home. But your debts do affect how much you can borrow and which loan programs fit.

Lenders look closely at your monthly obligations compared with your income. They also look at how you've managed credit. Understanding how this works, before you apply, gives you time to plan.

In this post, I'll explain which debts count, how debt-to-income ratio works, how student loans are treated, how credit fits in, why payment reporting matters, how to plan scenarios and why you should avoid new debt before closing.

This is general education, not a loan offer or commitment to lend. Loan programs, guidelines and eligibility change and depend on lender review and approval. Your lender will calculate your numbers based on your documents and program.

Which Debts Count?

Lenders generally look at recurring monthly obligations, such as:

• Student loans.
• Auto loans and leases.
• Credit card minimum payments.
• Personal loans.
• Other mortgages and housing costs for property you already own.
• Alimony or child support you're required to pay.
• Installment loans, like furniture or electronics financing.
• Co-signed loans, in many cases, even if someone else makes the payments.

The new home's housing payment, including principal, interest, property taxes, homeowners insurance, any mortgage insurance and HOA dues, is also part of the calculation.

What usually doesn't count: everyday living expenses like utilities, groceries, phone bills and car insurance. These still matter for your own budget, though.

Debt-to-Income Ratio (DTI)

Your debt-to-income ratio compares your monthly debt payments with your monthly gross income (before taxes).

DTI = Total monthly debt payments ÷ Gross monthly income

The CFPB explains DTI and why lenders use it.

Lenders often look at:

• Housing ratio: the new housing payment compared with income.
• Total debt ratio: the housing payment plus all other monthly debts compared with income.

Each loan program and lender has its own guidelines for DTI. Some consider other factors, like credit history and reserves, alongside DTI. I don't list specific DTI limits here because they vary by program and change over time. Ask your lender how your numbers fit the programs you're considering.

My post on how much house you can afford explains how income, debts and housing costs work together.

How Student Loans Are Treated

Student loans can be tricky because payments can change.

Common situations:

• Standard repayment: the monthly payment on your credit report or statement is usually used.
• Income-driven repayment: your payment may be based on income. Lenders may use the documented payment, depending on the program.
• Deferment or forbearance: you may not be making payments right now, but lenders usually still need to count a payment. Programs have different rules for what payment to use.
• $0 payment on an income-driven plan: programs differ on how this is treated.
• Loans in default: can affect eligibility for some programs.

Fannie Mae's Selling Guide, for example, has a section on monthly debt obligations, including student loans. FHA and other programs have their own rules.

Tip: gather your most recent student loan statements, including your current payment plan and payment amount. Ask your lender exactly how they'll count each loan.

How Credit Fits In

Debts also affect your credit, which affects your loan options.

Factors that matter:

• Payment history: on-time payments help; late payments hurt.
• Credit utilization: how much of your available credit card limits you're using.
• Length of credit history.
• Recent inquiries and new accounts.
• Collections or public records.

My post on what credit score you need to buy a home in California explains more. I don't list minimum credit scores because they vary by program and lender.

Payment Reporting Matters

What appears on your credit report is what lenders often see first.

Check your reports:

• Are all your debts listed accurately?
• Do payment amounts match your statements?
• Are any accounts listed that aren't yours?
• Are paid-off accounts showing as paid?

You can get free credit reports from each of the three major credit bureaus through AnnualCreditReport.com, the official site. If you find an error, you can dispute it. The CFPB explains how.

If your student loan payment on your credit report is wrong or shows $0, gather documentation from your servicer showing the correct payment. Your lender may need it.

Debts That Sometimes Surprise Buyers

Some obligations are easy to forget until a lender asks about them.

• "Buy now, pay later" plans. Short installment plans for purchases may or may not appear on your credit report, but lenders may ask about them. Tell your lender if you have any.
• Tax payment plans. If you owe the IRS or state and are on a payment plan, lenders usually need documentation.
• Collections and charge-offs. Some programs have rules about whether these must be paid or how they're counted.
• Retirement account loans. A 401(k) loan may be treated differently from other debt, depending on the program. Ask your lender.
• Leases. Car leases are usually counted as monthly debts.
• Business debts in your name. If you personally guarantee a business loan, it may count.
• Court-ordered payments. Child support and alimony you pay are usually counted.

Being upfront early prevents surprises later in escrow.

Ways to Strengthen Your Position Over Time

If your debts are higher than you'd like, you have options. The right ones depend on your situation, so talk with your lender before acting.

1. Pay every bill on time. Payment history is a major part of credit.
2. Lower credit card balances relative to your limits.
3. Avoid new credit for several months before applying.
4. Review your student loan plan with your servicer, and keep documentation of any changes.
5. Build savings for your down payment, closing costs and reserves.
6. Document all income you may be able to use.
7. Consider your price range. A lower housing payment improves your ratios.

The Federal Student Aid office of the U.S. Department of Education explains federal student loan repayment plans.

Scenario Planning

Before you apply, it helps to see how changes to your debts might affect your numbers. Use blank worksheets, then ask your lender to run the real calculations.

Your current picture:

Questions to explore with your lender:

• What if I pay off a small loan before applying?
• What if I pay down credit card balances?
• How would refinancing or changing a student loan plan affect my qualifying payment?
• What if a co-borrower joins the loan?

Be careful: paying off debt isn't always the best use of cash if you also need money for your down payment, closing costs and reserves. Talk with your lender before moving money, and keep records of every payment.

Avoid New Debt Before Closing

This is one of the most important rules for buyers.

Before and during your loan process, avoid:

• Opening new credit cards.
• Financing a car or furniture.
• Co-signing for someone else.
• Taking out personal loans.
• Running up credit card balances.
• Changing student loan plans without talking to your lender.

Lenders often check credit again before closing. New debt can change your DTI and, in some cases, your approval.

If you must make a change, talk with your lender first.

Questions to Ask Your Lender

1. How will you count each of my student loans?
2. What payment will you use if a loan is deferred or on an income-driven plan?
3. What is my estimated DTI for the programs I'm considering?
4. Would paying off or paying down any debt help?
5. Would a co-borrower change my options?
6. What documents do you need for my debts?
7. Will you check my credit again before closing?

Common Mistakes

1. Assuming a deferred loan won't count.
2. Not checking credit reports for errors.
3. Paying off debt with down payment money without talking to the lender.
4. Opening new credit during escrow.
5. Forgetting co-signed loans.
6. Guessing at DTI instead of asking the lender.

Key Takeaways

• Lenders look at recurring monthly debts and compare them with income.
• Student loans usually count, even when deferred.
• Credit reports should be accurate. Check them early.
• Plan scenarios with your lender before moving money.
• Avoid new debt until after closing.

A Hypothetical Example

This example is made up to show the process. It is not based on any real borrower, loan or lender.

A buyer has two student loans, one on an income-driven plan and one in deferment. Their credit report shows a $0 payment for the deferred loan.

Before applying, they gather statements from their servicer showing the current payment plan for each loan. The lender explains how each loan will be counted for the programs the buyer is considering. The buyer also has a small personal loan. The lender runs scenarios showing how paying it off would affect DTI, compared with keeping that cash for closing costs. The buyer decides with the lender's input and avoids any new debt until after closing.

Frequently Asked Questions

How I Can Help

As a broker and loan officer, I help buyers review their debts, understand how each one may be counted and plan scenarios before applying. Then I explain which programs may fit. Loan approval always depends on lender review and approval.

The Bottom Line

Student loans and other debts affect how much you can borrow, but planning helps. Know which debts count, understand your DTI, check your credit reports, gather student loan documents, plan scenarios with your lender and avoid new debt until after closing.

Want to review your debts before you apply? Let's go through them together.

Sources

• Consumer Financial Protection Bureau, "What is a debt-to-income ratio?": https://www.consumerfinance.gov/ask-cfpb/what-is-a-debt-to-income-ratio-en-1791/
• Fannie Mae Selling Guide, B3-6-02, Debt-to-Income Ratios: https://selling-guide.fanniemae.com/sel/b3-6-02/debt-income-ratios
• Fannie Mae Selling Guide, B3-6-05, Monthly Debt Obligations: https://selling-guide.fanniemae.com/sel/b3-6-05/monthly-debt-obligations
• AnnualCreditReport.com (official site for free credit reports): https://www.annualcreditreport.com/
• Consumer Financial Protection Bureau, disputing errors on your credit report: https://www.consumerfinance.gov/ask-cfpb/how-do-i-dispute-an-error-on-my-credit-report-en-314/
• U.S. Department of Housing and Urban Development, Buying a Home: https://www.hud.gov/helping-americans/buying-a-home
• U.S. Department of Education, Federal Student Aid, Repayment plans: https://studentaid.gov/manage-loans/repayment/plans

Review your debts before you apply. Call or text me at 408-780-1188, or email onrealtygroup@gmail.com.

Oanh Nguyen · Broker & Loan Officer · On Realty Group, brokered by LPT Realty · BRE #02133991 · NMLS 2020335

Equal Housing Opportunity.

Loan disclosure: Oanh Nguyen, Broker | Loan Officer, On Realty Group, brokered by LPT Realty, BRE #02133991, NMLS #2020335. This post is general education, not a loan offer, rate quote or commitment to lend. Loan programs, guidelines and eligibility change and are subject to lender review and approval.

Disclaimer: This post is general information only, not an appraisal or legal, tax or financial advice; data comes from the public sources linked above, is believed reliable but not guaranteed, and can change at any time.