How to Calculate Your Debt-to-Income Ratio for a Mortgage

Your debt-to-income ratio (DTI) compares your total monthly debt payments with your gross monthly income. Mortgage lenders use this percentage to help determine how comfortably you may be able to manage a monthly mortgage payment.

If you're preparing to buy or refinance a home in Maine or New Hampshire, understanding your DTI can help you estimate where you stand before applying. Below, we'll explain how to calculate your DTI, what lenders may consider a good ratio, how FHA loans handle DTI, and steps that may help lower yours.

What Is a Debt-to-Income Ratio?

Your Debt-to-Income Ratio (DTI) is a percentage that reflects how much of your gross monthly income goes toward debt payments. It’s a key indicator lenders use to evaluate how comfortably you can manage a monthly mortgage payment in addition to your current financial obligations.

DTI Formula:
Total Monthly Debt Payments ÷ Gross Monthly Income = DTI Ratio

For example, if you earn $6,000 per month before taxes and pay $2,100 toward existing debts, your DTI ratio is 35%.

Why Is DTI Important for Homebuyers in Maine and New Hampshire?

Lenders across the country rely on DTI as part of the mortgage underwriting process, but in Northern New England, where average home prices and incomes can vary significantly by region, DTI becomes even more important. Here’s why:

• In Maine, the median home price as of 2024 was around $390,000, but coastal areas like Portland or Camden can be significantly higher. [Maine Public]

• In New Hampshire, the statewide median hovered around $514,000, with towns near the Seacoast running well above average. [NH Business Review]

• Given the rising interest rates and home prices, managing your DTI is critical to maximizing affordability and qualifying for the best loan programs.

Most lenders prefer a DTI ratio below 43%, though some government-backed programs (like FHA or VA loans) may allow up to 50% depending on other financial factors.

How to Calculate Your DTI Ratio in 3 Easy Steps

Step 1: Add Up Your Monthly Debt Payments

These should include any fixed monthly obligations, such as:

• Auto loans

• Credit card minimum payments

• Student loans

• Personal loans

• Child support or alimony

• Estimated mortgage payment (including taxes and insurance)

Example:

Total Debt: $2,600/month

Step 2: Determine Your Gross Monthly Income

Include all income sources:

• Salary or hourly wages (before taxes)

• Bonuses or commissions

• Freelance/side gig income

• Rental income

• Alimony/child support (if applicable and consistent)

Example: $6,000/month total income

Step 3: Divide Monthly Debts by Income

$2,600 ÷ $6,000 = 0.433 or 43.3% DTI

In this scenario, your DTI is just over the commonly preferred threshold. While some lenders might still approve you (especially for FHA loans), it could limit your loan amount or affect your interest rate.

What Is a Good Debt-to-Income Ratio for a Mortgage?

Here's how most lenders categorize DTI ranges:

• Under 36%: Generally provides greater mortgage flexibility.
• 36% to 43%: Falls within common qualifying benchmarks for many borrowers.
• 44% to 50%: May still qualify depending on the loan program and overall financial profile.
• Over 50%: Options may be limited and will depend on underwriting and lender requirements.

What Debt-to-Income Ratio Is Allowed for an FHA Loan?

FHA loans can offer more flexibility for borrowers with higher debt-to-income ratios, but there is no single maximum DTI that applies to every FHA applicant. Lenders evaluate both your housing ratio, which compares your proposed monthly housing expenses with your gross monthly income, and your total DTI, which includes the housing payment plus recurring debts such as car loans, student loans, and credit card minimum payments.

For manually underwritten FHA loans, 31% for housing expenses and 43% for total monthly debts are common qualifying benchmarks. Higher ratios may be permitted when the borrower meets applicable FHA requirements and has qualifying compensating factors, such as documented cash reserves, a minimal increase in housing expenses, or sufficient residual income.

Many FHA applications are evaluated through an automated underwriting system that considers the borrower's complete financial profile. Credit history, stable income, available assets, the proposed housing payment, and lender-specific requirements can all affect the result. A higher DTI does not automatically qualify or disqualify someone, so the most accurate answer requires reviewing the borrower's complete loan scenario.

FHA Debt-to-Income Ratio FAQs

Can you qualify for an FHA loan with a DTI above 43%?

Yes, some borrowers may qualify for an FHA loan with a total DTI above 43%. The result depends on the complete loan application, including the automated or manual underwriting findings, credit history, income stability, available assets, and lender requirements.

What is the difference between front-end and back-end DTI for an FHA loan?

Front-end DTI compares your proposed monthly housing expenses with your gross monthly income. Back-end DTI includes the housing payment plus recurring monthly debts, such as car loans, student loans, and minimum credit card payments.

What compensating factors may help with a higher FHA DTI?

For manually underwritten FHA loans, qualifying compensating factors may include verified cash reserves, a minimal increase in housing expenses, or sufficient residual income after monthly obligations. The factors must meet applicable FHA guidelines and be documented by the lender.

Tips to Improve Your DTI Before Applying for a Mortgage

If your DTI is too high, don't worry - there are several strategies to lower it:

1. Pay Down Credit Cards and Loans

Focus on high-interest debts first. Even paying off one account can significantly reduce your DTI.

2. Avoid Taking on New Debt

Hold off on buying a new car or financing large purchases until after your mortgage closes.

3. Increase Your Income

Take on extra hours, freelance work, or consider renting out a room (common in seasonal areas like Bar Harbor or North Conway).

4. Refinance or Consolidate

Debt consolidation loans with lower monthly payments may help lower your obligations.

5. Work with a Local Mortgage Expert

A local mortgage advisor, like the experienced team at Acadia Lending Group, can recommend loan options that allow for slightly higher DTIs or help guide you through steps to strengthen your chances of approval.

Final Thoughts: Know Your DTI Before You Apply

Your Debt-to-Income Ratio is one of the most critical factors in the home loan approval process - especially in competitive markets like Southern Maine or the New Hampshire Seacoast. By calculating your DTI in advance and taking steps to improve it, you're not only improving your chances of getting approved - you're setting yourself up for a smoother, more affordable homeownership journey.

If you're preparing to purchase your first home, explore our First-Time Homebuyer Guide for Maine and New Hampshire for help with the broader mortgage and homebuying process.

Have questions about your own DTI or how it affects your ability to buy a home in Maine or New Hampshire?

Speak with a local, experienced mortgage advisor from Acadia Lending Group who knows the unique market conditions of your area. Whether you’re eyeing a home in Windham, Portsmouth, or the Lakes Region, getting personalized guidance can make all the difference.

Start today by calculating your DTI - and let's get you closer to your dream home! Give us a call at (207) 899-4500.