What lenders look at when they decide how much to lend you
A mortgage lender does not decide how much you can borrow based on the price of the house you want. They decide based on your income, debts, and down payment. The lender runs the numbers through two main tests: the debt-to-income ratio and the loan-to-value ratio. Both have to pass, or the lender will either turn you down or offer you less money than you asked for.
The debt-to-income ratio is the percentage of your gross monthly income that goes to debt payments. Most lenders will not lend you more than 43 percent of your gross income in total monthly debt — that includes the new mortgage payment, property taxes, homeowners insurance, any student loans, car loans, credit cards, and child support. Some lenders go up to 50 percent if you have excellent credit and a large down payment, but 43 percent is the standard.
The loan-to-value ratio is how much you are borrowing compared to what the house is worth. If you put down 20 percent, you are borrowing 80 percent of the value — that is an 80 percent loan-to-value ratio. Most lenders will go up to 95 or 97 percent loan-to-value if you have good credit, which means you can put down as little as 3 to 5 percent. The smaller your down payment, the more you pay in mortgage insurance, which is a monthly fee that protects the lender if you stop paying.
Key Takeaways
- Lenders use your debt-to-income ratio — the percentage of your gross monthly income that goes to all debt payments — to set a maximum loan amount, usually capped at 43 percent of income.
- Your down payment size affects how much you can borrow; a smaller down payment means a higher loan-to-value ratio and usually requires mortgage insurance.
- Your credit score, savings history, and employment record all influence whether a lender will approve you at the top of their range or offer you less.
- The actual dollar amount you can borrow depends on your specific income, existing debts, credit profile, and the interest rate the lender offers you.
How your income sets the ceiling
Start with your gross monthly income — that is your income before taxes, not what hits your bank account. If you earn $60,000 a year, your gross monthly income is $5,000. At the 43 percent debt-to-income limit, you can carry $2,150 in total monthly debt payments.
That $2,150 has to cover the new mortgage payment plus everything else. If you already have a $300 car loan and a $150 student loan payment, you have $450 in existing debt. That leaves $1,700 for the mortgage payment itself. The lender then works backward from that $1,700 to figure out how much principal you can borrow, accounting for the interest rate, the loan term (usually 30 years), property taxes, homeowners insurance, and mortgage insurance if your down payment is under 20 percent.
If you are self-employed or your income varies, lenders typically average your income over the last two years. If you changed jobs recently, some lenders want to see a two-year history in the same field to count your new income. Bonus income, commission, and rental income can count, but the lender will ask for documentation — usually tax returns and sometimes a letter from your employer.
How your down payment changes what you can borrow
A larger down payment means you borrow less, which lowers your monthly payment and makes you a lower-risk borrower. It also means you avoid mortgage insurance. If you put down 20 percent, you do not pay mortgage insurance. If you put down less, you do.
Mortgage insurance is not optional if you borrow more than 80 percent of the home's value. The cost varies by lender and your credit score, but it typically runs between 0.5 and 1.5 percent of the loan amount per year, paid monthly. On a $300,000 loan, that could be $125 to $375 per month. That payment counts toward your debt-to-income ratio, which means mortgage insurance reduces how much total you can borrow.
Some borrowers put down 3 to 5 percent and accept the mortgage insurance because they do not have 20 percent saved. Others save longer to reach 20 percent and avoid the insurance cost. There is no single right answer — it depends on your timeline, how much you have saved, and whether you expect your income to rise soon.
How your credit score and debt history affect the offer
Your credit score tells the lender how reliably you have paid debts in the past. A higher score means lower risk, which usually means a lower interest rate and the possibility of borrowing at the top of the lender's range. A lower score means a higher interest rate and possibly a lower maximum loan amount.
The difference in interest rate between a 740 credit score and a 620 credit score can be 0.5 to 1 percent or more. On a $300,000 loan, that difference adds up to $100 to $200 per month. A higher interest rate also increases your monthly payment, which reduces how much you can borrow under the debt-to-income test.
Lenders also look at your payment history — whether you have missed payments, how recently, and how often. A late payment from five years ago hurts less than one from last year. Collections accounts, foreclosures, and bankruptcies all reduce the amount lenders will offer. Some lenders have waiting periods: you might not be able to borrow until two years after a bankruptcy or one year after a foreclosure, depending on the lender and the loan type.
How interest rates change the math
The interest rate the lender offers you directly affects how much you can borrow. A higher rate means a higher monthly payment on the same loan amount, which pushes you over the debt-to-income limit faster. A lower rate means a lower monthly payment, which lets you borrow more.
Interest rates change daily and depend on the broader market, the loan type, your credit score, and your down payment size. You cannot know your exact rate until you are ready to lock it in with a lender. But you can use online calculators to estimate: if you know your income, debts, and down payment, you can plug in a few different interest rate scenarios to see how much the payment changes.
The difference between a 6.5 percent rate and a 7.5 percent rate on a 30-year mortgage is roughly $100 per month on a $300,000 loan. That $100 per month counts against your debt-to-income ratio, which could reduce your maximum borrowing by $20,000 to $30,000 depending on your income.
What happens after the lender gives you a number
When you talk to a lender, they will give you a pre-qualification or pre-approval letter. Pre-qualification is a rough estimate based on information you tell them — it is not a promise. Pre-approval is stronger: the lender has verified your income, credit, and assets, and they are saying they will lend you up to a certain amount, usually for 60 to 90 days.
The pre-approval letter tells you the maximum loan amount, but that does not mean you should borrow the maximum. That number assumes you want to spend 43 percent of your income on debt. Many financial advisors suggest keeping it lower — around 28 percent of your gross income just for the mortgage payment, property taxes, and insurance — so you have room for other expenses and savings.
Once you find a house and make an offer, the lender will order an appraisal. If the house appraises for less than the purchase price, the lender will only lend based on the appraised value, not the price you agreed to pay. That means you either have to come up with more cash for a down payment or renegotiate the price.
Frequently Asked Questions
Can I borrow more if I have a co-borrower?
Yes. The lender adds both incomes together and looks at both credit scores and debt histories. If your co-borrower has higher income or better credit, it can increase the total amount you can borrow. However, both of you are responsible for the full loan amount if one of you cannot pay.
Does getting pre-approved mean the lender will definitely lend me that amount?
Pre-approval is a conditional promise, not a may provide. The lender can still back out if your credit score drops, you lose your job, you take on new debt, or the house appraises for less than expected. It is a strong signal, but not final until you close on the loan.
What if I want to borrow less than the maximum?
You can always borrow less than the lender offers. Borrowing less means a lower monthly payment, more breathing room in your budget, and less interest paid over the life of the loan. The maximum is a ceiling, not a requirement.
How do I know if I should wait to buy until my credit improves?
If your credit score is below 620, many lenders will not work with you at all. If it is between 620 and 680, waiting six months to a year to pay down debt and build payment history can lower your interest rate by 0.5 to 1 percent, which saves thousands over the life of the loan. Use a credit monitoring service to track your score and see what is hurting it most.