What determines your loan amount

The amount a lender will approve depends on your income, debt, credit score, down payment, and the property value. Lenders use a formula called your debt-to-income ratio — they divide your total monthly debt payments by your gross monthly income. Most conventional lenders cap this at 43 percent, meaning if you earn $5,000 a month, your total monthly debts (including the new mortgage payment) cannot exceed $2,150.

Your credit score affects both the amount you can borrow and the interest rate you pay. A score of 620 or higher typically opens access to conventional mortgages, though scores above 740 usually get better rates. Your down payment also matters: a larger down payment reduces the lender's risk and often increases your approval amount. A 20 percent down payment is standard, but some programs accept 3 to 5 percent.

The property value sets a ceiling on what you can borrow. Lenders will not loan more than the home is worth, and they use an appraisal to confirm the price. If you find a house listed at $300,000 but it appraises at $280,000, your maximum loan is based on the lower figure.

Key Takeaways

  • Lenders typically allow your total monthly debt payments (including the new mortgage) to be no more than 43 percent of your gross monthly income.
  • Your credit score, down payment amount, and the property's appraised value all directly affect how much you can borrow.
  • You can request a pre-approval letter from a lender before house hunting, which shows sellers your borrowing capacity and locks in an interest rate for a set period.
  • The same income and debt profile may result in different loan amounts from different lenders, so comparing offers is worth the time.

How lenders calculate your maximum loan

Most lenders use two ratios to set your limit. The front-end ratio (also called the housing ratio) caps your mortgage payment at 28 percent of gross monthly income. The back-end ratio (debt-to-income) caps all monthly debt at 43 percent. Whichever ratio is lower becomes your limit.

Here is how it works in practice: if you earn $6,000 a month, the front-end ratio allows a mortgage payment of $1,680 (28 percent). If you already owe $800 a month in car loans and credit cards, your back-end ratio allows total debt of $2,580 (43 percent), which means a mortgage payment of $1,780. The lender uses the lower figure — $1,680 — as your maximum.

Once the lender knows your maximum monthly payment, they work backward to find the loan amount. A mortgage calculator or loan officer can convert that payment into a dollar amount, which depends on the interest rate and loan term (usually 15 or 30 years). A lower interest rate lets you borrow more for the same monthly payment.

Getting a pre-approval letter

A pre-approval letter is a written statement from a lender saying how much they will loan you, based on your income, debts, and credit. It is not a may provide, but it shows sellers you are a serious buyer and have already been vetted. The letter usually locks in an interest rate for 30 to 90 days.

To get pre-approved, you will need to provide recent pay stubs, tax returns (usually the last two years), bank statements, and a list of your debts. The lender will pull your credit report and verify your employment. The process typically takes a few days to a week.

Pre-approval is different from pre-qualification, which is a rough estimate based on information you provide without verification. Pre-approval carries more weight because the lender has checked your documents. Many real estate agents will not show you homes until you have a pre-approval letter.

Why different lenders offer different amounts

Even with identical income and debt, two lenders may approve you for different amounts. This happens because lenders have different risk tolerances, fee structures, and lending guidelines. A bank may be more conservative than a mortgage broker. A credit union may have special programs for members that allow higher debt-to-income ratios.

Interest rates also vary by lender and can shift daily. A lower rate means a lower monthly payment, which allows you to borrow more. A lender offering 6.5 percent may approve you for a larger loan than one offering 7 percent, even though both use the same income and debt figures.

Getting quotes from at least three lenders is standard practice. Each will pull your credit (multiple pulls within 14 days count as one inquiry), so comparing does not harm your score. You can see the actual loan amounts, rates, and fees side by side before deciding.

How your down payment affects approval

A larger down payment increases your approval amount because it reduces what the lender has to fund. If you have $60,000 saved and want to buy a $300,000 house, you need a $240,000 loan. If you have only $15,000 saved, you need a $285,000 loan for the same house.

Down payments below 20 percent usually require private mortgage insurance (PMI), which is an extra monthly cost that protects the lender if you default. PMI typically runs 0.5 to 1 percent of the loan amount per year, added to your monthly payment. This higher payment counts toward your debt-to-income ratio, which can lower your approval amount.

Some programs, like FHA loans, accept down payments as low as 3.5 percent. VA loans (for military members and veterans) may require no down payment at all. These programs have different debt-to-income limits and insurance costs, so the total borrowing power can vary significantly from a conventional 20 percent down mortgage.

What happens after pre-approval

Once you find a house and make an offer, the lender orders an appraisal. If the appraisal comes in lower than the purchase price, your loan amount drops to match the appraised value. You then have to decide whether to pay the difference out of pocket, renegotiate the price, or walk away.

The lender will also do a final verification of your employment and credit before closing. If you change jobs, rack up new debt, or miss a payment between pre-approval and closing, the lender may reduce or withdraw the approval. Avoid large purchases or opening new credit accounts during this period.

Your pre-approval expires after 30 to 90 days. If you have not found a house by then, you can request an extension or get a new pre-approval. Rates may have changed, and the lender may ask for updated pay stubs or bank statements.

Frequently Asked Questions

Can I get approved for more if I have a co-signer?

Yes. A co-signer's income and debts are added to yours, which can raise your approval amount. The co-signer is legally responsible for the loan if you default, so lenders take this seriously and verify their finances as thoroughly as yours.

Does getting pre-approved hurt my credit score?

A pre-approval involves a hard credit inquiry, which temporarily lowers your score by a few points. However, multiple mortgage inquiries within 14 days count as one, so shopping around does not compound the damage. The score usually recovers within a few months.

What if my income is irregular or self-employed?

Self-employed borrowers typically need to provide two years of tax returns and sometimes a profit-and-loss statement. Lenders average your income over that period. If your income has been declining, they may use a lower average, which reduces your approval amount.

Can I be approved for a larger loan if I lock in a lower interest rate?

Yes. A lower rate means a lower monthly payment for the same loan amount, which improves your debt-to-income ratio and can allow you to borrow more. However, rates change daily, and locking in a rate usually costs a fee and expires after 30 to 90 days.

What if I have student loans or other deferred debt?

Lenders count student loans toward your debt-to-income ratio even if you are in deferment or on an income-driven repayment plan. They typically use a standard payment amount (often 0.5 to 1 percent of the loan balance) rather than your actual payment, which can lower your approval amount.