The real test: your debt-to-income ratio and down payment

You can afford a home when your monthly debt payments (car loans, student loans, credit cards, and the new mortgage) stay below 43% of your gross monthly income, and you have saved a down payment. Most lenders will not approve you above that 43% threshold, regardless of how much you want the house. This is the single biggest constraint.

The second constraint is down payment. The minimum varies by loan type: conventional loans typically require 3% to 20% down, FHA loans require 3.5% down, and VA loans (if you may have access to) require 0% down. If you have saved less than the minimum for the loan type you are considering, you cannot close on a home yet, even if your income would support the monthly payment.

Before you talk to a lender, calculate your own debt-to-income ratio. Add up all your monthly debt payments: car payment, student loan payment, minimum credit card payment, and any other loans. Divide that total by your gross monthly income (before taxes). If the result is 43% or higher, you will need to pay down debt or increase income before a lender will approve you.

Key Takeaways

  • Your monthly debt payments cannot exceed 43% of your gross monthly income, or most lenders will reject your application regardless of the home price.
  • You must have saved a down payment that meets the minimum for your loan type—typically 3% to 3.5% for FHA or conventional loans, or 0% for VA loans if you are may be able to access.
  • Your credit score affects the interest rate you receive; scores below 620 make conventional loans very difficult and may limit you to FHA loans.
  • Closing costs (title, appraisal, inspection, insurance, and lender fees) typically run 2% to 5% of the home price and must be paid at closing, separate from your down payment.
  • Your monthly housing payment should not exceed 28% of your gross monthly income, which is stricter than the 43% debt-to-income rule and is how lenders size the actual loan.

How lenders calculate the maximum loan amount

Lenders use the 28% rule to determine how much they will lend you. They take your gross monthly income, multiply it by 0.28, and that is the maximum monthly housing payment you can have. The housing payment includes principal, interest, property taxes, homeowners insurance, and mortgage insurance (if your down payment is less than 20%).

Example: if your gross monthly income is $5,000, your maximum housing payment is $1,400 per month. A lender will then work backward to find what loan amount produces a $1,400 payment, accounting for your local property tax rate and insurance costs. The result is your maximum loan amount. Your down payment is added to that loan amount to get the maximum home price you can afford.

This 28% rule is stricter than the 43% debt-to-income rule for most buyers, so it usually determines your actual borrowing limit. If you have $500 in other monthly debt, the 43% rule allows a $2,150 housing payment on $5,000 income, but the 28% rule caps you at $1,400. The lender will use the lower number.

What your credit score means for affordability

Your credit score determines the interest rate you receive, which directly changes your monthly payment and your maximum loan amount. A score of 760 or higher typically gets the best rates. A score between 700 and 759 gets slightly higher rates. A score between 620 and 699 gets noticeably higher rates and may limit you to FHA loans. A score below 620 makes conventional loans nearly impossible.

The difference between a 3.5% rate and a 5.5% rate on a $300,000 loan is roughly $380 per month—enough to disqualify you if you are already near your 28% limit. If your score is below 700, paying down debt and waiting a few months to rebuild your score before applying can save you tens of thousands of dollars over the life of the loan.

You can check your credit score for free through AnnualCreditReport.com, which is the official site for the three major credit bureaus (Equifax, Experian, and TransUnion). Lenders pull all three scores and use the middle one. If you see errors on your report, you can dispute them directly with the bureau at no cost.

Down payment, closing costs, and cash reserves

Your down payment is separate from closing costs. If you are buying a $300,000 home with 5% down, your down payment is $15,000. Closing costs (appraisal, title search, title insurance, homeowners insurance, property taxes, lender fees, and inspections) typically run 2% to 5% of the home price—in this case, $6,000 to $15,000 more. You must have both amounts saved before closing.

Some loan programs allow you to roll closing costs into the loan or ask the seller to pay them, but this is not may provide and reduces the amount you can borrow. The safest assumption is that you need to pay closing costs out of pocket. Add them to your down payment to find your true savings target.

Lenders also want to see cash reserves after closing—typically two to three months of housing payments sitting in the bank. If you have just enough for down payment and closing costs, you may not be approved. Building reserves takes time, which is another reason to start saving early.

How much house you can afford versus how much you should buy

The maximum a lender will approve you for is not the same as what you should spend. Lenders use the 28% rule, which assumes you have no other financial goals. In reality, you need money for emergencies, retirement savings, and other life expenses. Many financial advisors recommend keeping your housing payment to 25% of gross income or lower, which gives you more breathing room.

If you are approved for a $400,000 home but your emergency fund is thin, your car is aging, or you have not started saving for retirement, buying the maximum may leave you house-poor. A smaller home that costs less per month gives you flexibility to handle unexpected repairs, job changes, or medical expenses without financial stress.

Consider also that homeownership costs more than just the mortgage: property taxes, insurance, maintenance, utilities, and HOA fees (if applicable) all add up. A home that costs $1,400 per month in mortgage payment might cost $1,800 to $2,000 per month in total housing expenses. Make sure your budget accounts for the full picture.

Steps to take before talking to a lender

First, pull your credit report from AnnualCreditReport.com and check your score. If it is below 700, focus on paying down revolving debt (credit cards) for the next few months before applying. Paying down debt improves your score and lowers your debt-to-income ratio at the same time.

Second, calculate your debt-to-income ratio. List every monthly debt payment, add them up, and divide by your gross monthly income. If the result is above 43%, you need to pay down debt or wait for income to increase before you will be approved.

Third, determine how much you have saved for down payment and closing costs combined. Compare that to the minimum down payment for the loan type you are considering (3% to 3.5% for most loans, 0% for VA loans). If you are short, set a savings target and a timeline.

Fourth, use an online mortgage calculator to estimate your maximum loan amount based on your income, debt, and down payment. This gives you a realistic price range before you talk to a lender. Lenders will confirm or adjust this number based on their own underwriting, but the calculation shows you whether you are in the ballpark.

When you are not ready to buy yet

If your debt-to-income ratio is above 43%, focus on paying down debt before saving for a down payment. Every dollar you put toward credit cards or car loans improves both your ratio and your credit score. This is the fastest path to affordability.

If your credit score is below 620, you will struggle to get approved for any conventional loan. Spend three to six months paying bills on time and paying down revolving debt. Your score will improve, and you will may have access to for better rates when you do apply.

If you have not saved a down payment yet, start now. Even if you can only save $100 or $200 per month, that compounds. A 3% down payment on a $300,000 home is $9,000—achievable in three to four years of consistent saving if you can set aside $200 to $250 per month.

Frequently Asked Questions

What if I have student loans—do they count toward my debt-to-income ratio?

Yes. Lenders count your actual monthly student loan payment, not the full balance. If you are on an income-driven repayment plan, they use that payment amount. If you have not started repaying yet, they estimate the payment based on your loan balance. Either way, it counts against your 43% limit.

Can I use a co-signer to increase my borrowing power?

Yes, but the co-signer's income and debt are added to yours for the calculation. A co-signer does not increase your limit unless their income is higher than yours and their debt is lower. Both of you must also meet the credit score minimum, and both names go on the loan and the deed.

What if the seller pays my closing costs—does that change what I can afford?

It changes your cash flow at closing, but not your monthly affordability. If the seller pays closing costs, you need less cash upfront, but your loan amount stays the same and your monthly payment does not change. Your debt-to-income ratio and the 28% housing payment rule still apply.

Do I need to be pre-approved before I start looking at homes?

Pre-approval is not required, but it is useful. A pre-approval letter from a lender tells you your maximum loan amount and shows sellers you are serious. It takes a few days and requires a credit check, but it costs nothing and gives you a realistic price range to search within.

What happens if my income changes after I am approved?

Your approval is based on your income at the time of application. If your income drops before closing, the lender may re-verify and reduce your approval. If your income increases, it does not change your approval unless you ask the lender to re-run the numbers. Changes in employment (even to a better job) can trigger a re-verification, so avoid job changes between approval and closing if possible.