The mortgage you can qualify for depends on four main factors: your credit score, your debt-to-income ratio, your down payment, and the loan program you apply through. These variables interact with each other, so a weakness in one area can sometimes be offset by strength in another. Here’s how each piece works and what the different loan programs require.
How Lenders Decide What You Qualify For
Lenders don’t just look at your income and hand you a number. They calculate your full monthly housing payment, which includes principal, interest, property taxes, and homeowners insurance (often abbreviated as PITI). If you put down less than 20% on a conventional loan, they also add private mortgage insurance (PMI) to that figure. FHA loans carry their own version called a mortgage insurance premium (MIP). All of these costs count toward your qualification.
The lender then compares that total housing payment to your gross monthly income. Most lenders want your housing payment to stay at or below 28% of your gross income. This is called your front-end ratio. So if you earn $7,000 per month before taxes, your full PITI payment generally needs to stay under $1,960.
Then there’s the back-end ratio, which adds all your other monthly debts to your housing payment: car loans, student loans, minimum credit card payments, personal loans, and child support. The ceiling for this total debt-to-income (DTI) ratio varies by loan program, and it’s often the number that limits how much house you can afford.
DTI Limits by Loan Program
For conventional loans underwritten through Fannie Mae’s automated system (which is how most conventional loans are processed), the maximum back-end DTI ratio is 50%. That means if you earn $7,000 per month, all your monthly debt payments combined, including the new mortgage, can’t exceed $3,500.
If your conventional loan is manually underwritten instead, the standard cap drops to 36%. Borrowers with higher credit scores and cash reserves can stretch that to 45%, but manual underwriting is less common and typically applies when the automated system can’t approve you.
FHA and VA loans follow their own agency guidelines. FHA loans generally allow back-end DTI ratios up to 43%, though borrowers with strong compensating factors like significant savings or a long employment history can sometimes get approved with ratios above 50%. VA loans are among the most flexible, with no hard DTI cap, though most lenders prefer to see ratios at or below 41%.
Credit Score Thresholds
Your credit score determines which loan programs are available to you and what interest rate you’ll pay. A higher score opens more doors and lowers your borrowing costs.
- Conventional loans typically require a minimum score of 620. The best rates go to borrowers with scores above 740.
- FHA loans accept scores as low as 580 with 3.5% down. If your score falls between 500 and 579, you can still qualify but need to put 10% down.
- USDA loans generally require a 640 or higher for streamlined approval processing.
- VA loans have no official minimum set by the VA itself, but most lenders require at least 620.
Keep in mind that the minimum score gets you in the door, not a good deal. A borrower with a 620 score will pay a noticeably higher interest rate than someone at 760, which translates to tens of thousands of dollars over the life of the loan. Even a 20-point improvement in your score before applying can save you real money.
Down Payment Requirements
The amount you can put down affects both your loan options and your monthly payment. Lower down payments mean higher monthly costs because you’re borrowing more and often paying for mortgage insurance.
Conventional loans allow as little as 3% down, though you’ll pay PMI until you reach 20% equity in the home. FHA loans require 3.5% down with a credit score of 580 or higher, and their mortgage insurance premium stays on the loan for its full term if you put down less than 10%. VA loans require no down payment at all for eligible veterans and active-duty service members, with no monthly mortgage insurance. USDA loans also offer zero-down financing for homes in eligible rural and suburban areas.
A larger down payment does more than reduce your loan amount. It can help you qualify for a bigger purchase price, eliminate insurance costs, and sometimes secure a lower interest rate.
How Much You Can Borrow
The baseline conforming loan limit for 2026 is $832,750 for a single-family home in most of the country. In high-cost areas, that ceiling rises to $1,249,125. These limits apply to conventional loans backed by Fannie Mae and Freddie Mac. If you need to borrow more, you’ll need a jumbo loan, which typically requires a larger down payment, a higher credit score, and more cash reserves.
FHA and VA loans have their own limits that vary by county. USDA loans don’t have a set loan limit but cap your household income relative to the area median.
Your personal borrowing limit will almost always be lower than the program maximum. It’s set by your DTI ratio. To estimate it roughly: take your gross monthly income, multiply by the maximum DTI ratio for your loan type (say 0.43 for FHA), then subtract your existing monthly debts. The result is the maximum monthly housing payment a lender would approve. From there, your interest rate, property tax estimates, and insurance costs determine how large a loan that payment supports.
Which Loan Program Fits Your Situation
If you have a credit score above 700, at least 5% to put down, and manageable debts, a conventional loan will usually offer the best terms and the most straightforward path to dropping mortgage insurance later.
If your credit score is below 620 or you have limited savings, an FHA loan is designed for you. The trade-off is permanent mortgage insurance on most FHA loans, which adds to your monthly cost. For borrowers with scores in the 580 to 619 range, FHA is often the only realistic option.
If you’re a veteran or active-duty military member, a VA loan is almost always worth pursuing first. No down payment, no monthly mortgage insurance, and competitive interest rates make it one of the strongest loan products available.
If you’re buying in a less densely populated area and your household income is moderate, check USDA eligibility. The zero-down feature and below-market rates can make homeownership significantly more accessible.
Getting a Realistic Answer
Online mortgage calculators give you a rough starting point, but the most accurate way to find out what you qualify for is to get preapproved by a lender. Preapproval involves a credit check and income verification, and it produces a specific loan amount you’re approved to borrow. It also signals to sellers that you’re a serious buyer.
Before you apply, gather your last two years of tax returns, recent pay stubs, bank statements from the past two to three months, and documentation for any other income sources. If you’re self-employed, expect to provide profit-and-loss statements and possibly business tax returns.
Getting preapproved by two or three lenders within a short window (typically 14 to 45 days) counts as a single inquiry on your credit report, so shopping around won’t hurt your score. Rates and fees vary meaningfully between lenders, and comparing offers can save you thousands over the life of the loan.