What lenders look at when deciding how much to lend you

A mortgage lender will not tell you how much house costs. They will tell you how much they will lend you based on your income, debts, credit history, and the down payment you have saved. These four things determine your borrowing limit, not the price of homes in your area or what your friends borrowed.

The most common measure is your debt-to-income ratio, or DTI. This is the percentage of your gross monthly income (before taxes) that goes toward debt payments each month. Most lenders will lend you money if your DTI stays below 43 percent when you add the new mortgage payment. Some lenders go up to 50 percent if you have a strong credit score and savings, but 43 is the standard.

Here is how it works in practice: if you earn $5,000 per month before taxes, 43 percent of that is $2,150. That $2,150 has to cover your new mortgage payment, property taxes, homeowners insurance, any student loans, car payments, credit card minimums, and other debts. If you already owe $400 per month on other debts, you have $1,750 left for the mortgage itself.

Key Takeaways

  • Lenders typically cap your total monthly debt payments at 43 percent of your gross income, which includes the new mortgage payment plus all other debts.
  • Your credit score, down payment size, and employment history all affect whether a lender will approve you and at what interest rate.
  • The maximum loan amount depends on current mortgage interest rates, which change daily and directly affect how much you can borrow at a given monthly payment.
  • Getting pre-approved by a lender tells you your actual borrowing limit in writing, not just an estimate based on online calculators.
  • The amount you can borrow is different from the amount you should borrow, and lenders do not always account for property taxes, insurance, and maintenance costs in their calculations.

How your credit score and down payment change your limit

A higher credit score gets you a lower interest rate, which means you can borrow more money at the same monthly payment. If your score is 760 or above, you might may have access to for a rate that is 0.5 to 1 percent lower than someone with a score of 620. Over a 30-year loan, that difference can mean borrowing $50,000 to $100,000 more.

Your down payment works the same way. If you put down 20 percent of the home price, lenders see less risk and will lend you more. If you put down 3 percent, they charge you more in interest and may require mortgage insurance, which is an extra monthly fee. The larger your down payment, the higher your borrowing limit becomes.

Lenders also look at how stable your income is. If you have been at the same job for two years or more, you are a lower risk than someone who just started. Self-employed people and freelancers often need two years of tax returns to prove their income is consistent. Recent job changes, gaps in employment, or income that varies month to month can lower the amount a lender will offer you.

Why interest rates matter more than you think

The interest rate you get determines how much of your monthly payment goes toward interest versus principal. A higher rate means more of each payment disappears into interest, so you can borrow less money at the same monthly payment.

Interest rates change daily based on the bond market and the Federal Reserve's actions. When rates are 6 percent, you might may have access to to borrow $300,000. When rates drop to 5 percent, that same monthly payment might support a $330,000 loan. When rates rise to 7 percent, your limit drops to $270,000. You do not control the rate, but you should know that your borrowing limit is tied directly to whatever rate is available the day you apply.

This is why getting pre-approved matters. An online calculator can give you a rough idea, but a real pre-approval letter from a lender shows you the actual rate they will offer you and the actual loan amount you can get at that rate.

The difference between what you can borrow and what you should borrow

Lenders calculate how much you can borrow based on your debt-to-income ratio. They do not always account for property taxes, homeowners insurance, and maintenance costs in the way that affects your actual monthly budget.

A lender might approve you for a $400,000 mortgage with a $2,000 monthly payment. But if property taxes in your area are $300 per month, insurance is $150 per month, and you set aside $200 per month for repairs and maintenance, your real housing cost is $2,650. That might be more than you can comfortably afford, even though the lender approved it.

Financial advisors often recommend borrowing no more than 28 percent of your gross income for housing costs alone (mortgage, taxes, insurance, and HOA fees if applicable). This is stricter than the lender's 43 percent rule, but it leaves room for other expenses and emergencies. You can borrow up to the lender's limit, but that does not mean you should.

How to find out your actual borrowing limit

The most accurate way is to contact a mortgage lender and ask for a pre-approval. You will need to provide recent pay stubs, W-2 forms or tax returns, a list of your debts, and permission for a credit check. The lender will then tell you in writing the maximum loan amount they will offer you, the interest rate, and the estimated monthly payment.

You do not have to use the first lender you contact. It is normal to get pre-approvals from three or four lenders and compare their offers. Each pre-approval is good for 90 to 120 days, so you can shop around without losing your rate.

Online mortgage calculators can give you a starting point, but they use average assumptions about interest rates and do not know your actual credit score, down payment, or debts. They are useful for understanding the math, but a pre-approval is what actually matters when you start looking at homes.

What happens if you do not have a large down payment

Many first-time buyers worry that a small down payment will severely limit their borrowing. It does lower your limit, but not as much as you might think. A lender will approve you with 3 percent down, 5 percent down, or 10 percent down. The trade-off is that you will pay a higher interest rate and you will have to pay private mortgage insurance (PMI), which is typically 0.5 to 1 percent of your loan amount per year.

PMI protects the lender if you stop paying, not you. Once you have paid down your loan to 80 percent of the home's original value, you can request that PMI be removed. This usually takes 8 to 12 years if you make regular payments, though you can reach it faster by making extra principal payments or if your home appreciates in value.

The higher rate and PMI cost mean your monthly payment will be higher than someone with 20 percent down. But you can still borrow enough to buy a home. The question is whether the monthly cost fits your budget.

Frequently Asked Questions

Does getting pre-approved hurt my credit score?

A pre-approval requires a hard credit inquiry, which does lower your score by a few points. But multiple pre-approvals within 14 to 45 days (depending on the credit scoring model) count as a single inquiry, so you can shop around without extra damage. The impact is temporary and usually recovers within a few months.

Can I borrow more if I have a co-signer?

Yes. A co-signer's income and debts are added to yours when calculating your debt-to-income ratio. If your co-signer earns $3,000 per month with no debts, that $3,000 is available to support the mortgage. However, the co-signer is legally responsible for the loan if you do not pay, so lenders take this seriously and check their credit and income carefully.

What if my income is seasonal or variable?

Lenders typically average your income over the past two years. If you earn $60,000 in some months and $20,000 in others, they use an average. Self-employed people and commission-based workers need to show two years of tax returns to prove this average. Recent job changes or new self-employment may require additional documentation.

Does the amount I can borrow change if interest rates drop?

Yes. If rates drop after you get pre-approved, you can refinance to a lower rate, which lowers your monthly payment. You could then use that lower payment to borrow more, or keep the payment the same and pay off the loan faster. But your pre-approval is based on the rate available when you apply, so you would need a new pre-approval to lock in a new rate.

Should I max out my borrowing limit?

Not necessarily. Just because a lender will approve you for $400,000 does not mean you should borrow that much. Consider your job stability, whether you have an emergency fund, your other financial goals, and whether you can afford the payment if rates rise on an adjustable-rate loan. Many people borrow 10 to 20 percent less than their maximum to have breathing room in their budget.