Start with your gross monthly income, not what you want to spend

The amount you can afford depends on how much you earn, how much debt you already carry, and what interest rate you lock in. Most lenders use two ratios to decide: the front-end ratio (your housing payment divided by gross monthly income) and the back-end ratio (all monthly debt payments divided by gross monthly income). A typical lender will approve you if your housing payment is no more than 28% of your gross income and your total debt payments are no more than 36% of gross income. These are guidelines, not laws — some lenders go higher, some lower, and your actual approval depends on your credit score, down payment, and the specific loan program.

Start by calculating your gross monthly income. If you earn $60,000 a year, that is $5,000 per month before taxes. Multiply that by 0.28 to find the maximum housing payment most lenders will approve: $1,400. That payment covers principal, interest, property taxes, homeowners insurance, and mortgage insurance if your down payment is less than 20%. It does not include utilities, maintenance, or repairs.

The second ratio matters just as much. Add up every monthly debt payment you make right now — car loans, student loans, credit cards, personal loans. If those total $800 per month and your gross income is $5,000, your remaining debt capacity is $1,000 (36% of $5,000 minus $800). That $1,000 is your maximum housing payment under the back-end ratio. If the front-end ratio allows $1,400 but the back-end ratio allows only $1,000, the lender will use $1,000.

Key Takeaways

  • Most lenders cap your housing payment at 28% of gross monthly income and all debt payments at 36% of gross income, though these are guidelines, not hard limits.
  • Your housing payment includes principal, interest, property taxes, insurance, and mortgage insurance, but not utilities or maintenance.
  • Existing debt payments reduce how much house payment you can afford, so paying down a car loan or credit card before buying can increase your approval amount.
  • A larger down payment lowers your monthly payment and removes the mortgage insurance requirement, making a higher purchase price affordable.
  • The interest rate you receive depends on your credit score, so checking your score before shopping for a mortgage can show you what rates you will likely see.

How down payment size changes what you can afford

The more you put down, the lower your monthly payment and the higher the purchase price you can afford. A 20% down payment eliminates private mortgage insurance (PMI), which can add $100 to $300 per month depending on the loan size. A 10% down payment on a $300,000 house means a $30,000 down payment and a $270,000 loan; a 20% down payment means $60,000 down and a $240,000 loan. The second loan is smaller, so the monthly payment is lower even at the same interest rate.

If you have $40,000 saved and are deciding between a 10% down payment on a $400,000 house or a 20% down payment on a $200,000 house, the monthly payment difference is substantial. The $400,000 purchase with 10% down means a $360,000 loan plus PMI; the $200,000 purchase with 20% down means a $160,000 loan with no PMI. At a 7% interest rate, the first payment is roughly $2,400 per month with PMI included; the second is roughly $1,060. If your income allows $1,400 per month for housing, only the second option fits.

Some loan programs allow down payments as low as 3% (conventional loans) or even 0% (VA loans for military members, USDA loans in rural areas). These programs make homeownership possible with less savings upfront, but the trade-off is a higher monthly payment because the loan is larger and PMI is required.

Interest rate changes the payment more than you might think

A 1% difference in interest rate changes your monthly payment by roughly $100 per $100,000 borrowed. If you are approved for a $300,000 loan at 7%, your principal and interest payment is about $1,996 per month. At 6%, it drops to about $1,799. At 8%, it rises to about $2,201. That $200 difference per month across 30 years is $72,000 in total payments.

Your interest rate depends on your credit score, the size of your down payment, the type of loan, and the current market. A credit score of 760 or higher typically gets the best rates; a score of 620 to 639 pays a noticeably higher rate. You can see what rate you might receive by getting pre-approved with a lender — they will pull your credit and give you a rate estimate based on your actual profile, not a general average.

Rates also change daily based on the bond market and Federal Reserve decisions. If you are shopping for a house over several months, the rate you see in month one may not be the rate you lock in at closing. Some lenders offer rate locks that hold your rate for 30, 45, or 60 days while you search and make an offer; after that period, the rate adjusts to current market rates.

What happens if you are self-employed or have irregular income

Lenders typically average your income over two years if you are self-employed, own a business, or work on commission. They will ask for tax returns, profit-and-loss statements, and sometimes bank statements to verify that income is stable or growing. If your income dropped significantly in year two compared to year one, the lender may use the lower year or average the two, which reduces the payment you can afford.

If you recently changed jobs, most lenders want to see a two-year history in the same field, even if you changed employers. A career change into a new field may require a longer employment history or additional documentation to show the income is stable. Bonus income, overtime, and rental income can count toward your total, but the lender will verify it with documentation and may average it over two years.

Gig work and contract income are harder to document. Some lenders will count it if you have been doing it for two years and can show consistent deposits in your bank account. Others will not count it at all. If you have irregular income, getting pre-approved early in your home search tells you what a lender will actually count, rather than guessing.

How to increase the house payment you can afford

Pay down existing debt before you apply for a mortgage. If you have a $300 car payment and a $200 credit card payment, paying off the car loan removes $300 from your monthly obligations, which increases your debt capacity by roughly $300 under the 36% rule. That extra $300 can go toward your housing payment instead.

Increase your down payment if you can. Saving an extra $10,000 to $20,000 lowers the loan amount and removes or reduces PMI, both of which lower your monthly payment and free up room in your debt ratio for a higher purchase price.

Improve your credit score before applying. Paying down credit card balances (especially high-balance cards), paying all bills on time for several months, and checking your credit report for errors can raise your score. A higher score gets you a lower interest rate, which lowers your monthly payment and increases the price range you can afford.

Add a co-borrower with income. If you are buying with a spouse or partner, both incomes count toward your approval. If you are buying alone and have a family member willing to co-sign, their income can be included, though they become legally responsible for the loan if you do not pay.

The difference between what you can afford and what you should spend

Lender approval is a ceiling, not a recommendation. Just because a lender approves you for a $1,400 monthly payment does not mean you should spend that much. That payment assumes you have no other financial goals — no emergency fund, no retirement savings, no room for a job loss or major repair.

A common rule of thumb is to spend no more than 25% to 28% of gross income on housing, which is lower than the lender's 28% to 36% thresholds. This leaves room for property taxes and insurance to increase, for maintenance and repairs (typically 1% of the home's value per year), and for other life expenses. If your gross income is $5,000 per month, a $1,250 housing payment (25%) is more sustainable than a $1,400 payment (28%), especially if you have student loans, a car payment, or other obligations.

Consider also what happens if one income disappears. If you are buying with a spouse and one of you loses a job, can you still afford the payment on one income? If not, you are spending too much. A house payment that requires both incomes to survive is a risk, not an achievement.

Frequently Asked Questions

Can I get approved for more if I have a large down payment?

Yes. A larger down payment lowers your loan amount, which lowers your monthly payment. That lower payment means you can afford a higher purchase price while staying within your debt ratios. A 20% down payment also removes PMI, which saves $100 to $300 per month and frees up room in your budget for a higher price.

What if my spouse and I have very different incomes?

Both incomes count toward your approval. The lender adds them together and applies the debt ratios to the combined total. If one spouse has significant debt, that debt counts against both of you, so paying it down before applying helps both of you.

Does getting pre-approved lock in an interest rate?

No. Pre-approval gives you an estimate based on current rates and your credit profile. The rate is locked only when you formally lock it with the lender, usually after you make an offer on a house. Most locks last 30 to 60 days; if closing takes longer, you may have to pay a fee to extend the lock or accept a new rate.

Can I afford a house if I have student loans?

Yes, but student loan payments reduce how much house payment you can afford. If your student loan payment is $300 per month and your gross income is $5,000, your remaining debt capacity is $1,500 (36% of $5,000 minus $300). That is your maximum housing payment under the back-end ratio. Paying down the student loan before buying increases the payment you can afford.

What if I get a raise after I am approved?

Your approval is based on your income at the time of application. A raise after approval does not change your approval amount, but it does give you more breathing room in your actual budget. The payment stays the same, but it represents a smaller percentage of your new income.