A reasonable mortgage payment is one that stays at or below 28% of your gross monthly income, the threshold most lenders and financial planners use as a guideline. For a household earning $80,000 a year, that works out to roughly $1,867 per month for housing costs. But that single number only tells part of the story, because what counts as “reasonable” depends on your other debts, the interest rate you lock in, and what’s actually included in the payment.
The 28/36 Rule Explained
The most widely used benchmark for mortgage affordability is the 28/36 rule. It has two parts. First, your total housing costs (mortgage principal, interest, property taxes, and homeowners insurance) should not exceed 28% of your gross monthly income. Second, your total debt payments, housing included, should stay below 36% of gross monthly income. Total debt means everything: car loans, student loans, minimum credit card payments, and your mortgage.
Here’s how to apply it. Take your annual salary before taxes, divide by 12, and multiply by 0.28 for the housing ceiling and 0.36 for the total debt ceiling. If you earn $100,000 a year, your gross monthly income is $8,333. Twenty-eight percent of that is $2,333 for housing. Thirty-six percent is $3,000 for all debts combined. If you already pay $700 a month toward a car loan and student loans, your mortgage payment would need to stay under $2,300 to clear both thresholds.
This rule is a starting point, not a rigid law. Plenty of households spend more than 28% on housing and manage fine, while others find even 25% uncomfortable because of irregular income or high childcare costs. The value of the rule is that it forces you to look at your full debt picture, not just the mortgage in isolation.
What Lenders Will Actually Approve
Lenders use their own version of these ratios, called front-end and back-end debt-to-income (DTI) ratios. Your DTI is simply your total monthly debt payments divided by your gross monthly income, expressed as a percentage.
For conventional loans, most lenders cap the front-end ratio (housing only) at 28% and the back-end ratio (all debts) at 36%, closely mirroring the 28/36 rule. Some will stretch to 43% or even 45% on the back end for borrowers with strong credit scores and significant cash reserves.
FHA loans, which are popular with first-time buyers, allow a front-end DTI of up to 31% and a back-end DTI of up to 43%. Borrowers with compensating factors like a high credit score, extra savings, or additional income streams can sometimes qualify with a back-end DTI as high as 50%. That flexibility sounds generous, but qualifying for a loan and being comfortable with the payment are two very different things. Just because a lender approves you at 45% DTI doesn’t mean that payment will feel manageable month to month.
Where the National Average Stands
According to the Mortgage Bankers Association, the national median mortgage payment for purchase applicants reached $2,070 in January 2026. Conventional loan applicants had a median payment of $2,081, while FHA applicants came in slightly lower at $1,782. For borrowers at the lower end of the market (the 25th percentile), the median payment was $1,445.
These figures reflect principal and interest plus any mortgage insurance, but they don’t tell you whether those payments are reasonable for the people making them. A $2,081 monthly payment is comfortable on a $120,000 household income (about 21% of gross) and a serious stretch on $60,000 (about 42%). The dollar amount matters far less than the ratio to your own income.
How Interest Rates Change the Math
The interest rate on your mortgage has an outsized effect on your monthly payment. Data from the Consumer Financial Protection Bureau illustrates this clearly: on a $400,000 loan, the principal and interest payment was $1,612 at a 2.65% rate, $2,450 at 6.20%, and $2,877 at 7.79%. That’s a difference of more than $1,265 per month between the lowest and highest rate, a 78% increase on the same loan amount.
Even small rate movements make a real difference. Dropping from 7.25% to 6.5% on a $400,000 loan saves about $200 per month. Over 30 years, that one rate change adds up to $72,000. This is why your credit score matters so much in determining what’s “reasonable.” A borrower with excellent credit might get a rate half a percentage point lower than someone with fair credit, and on a large loan, that gap translates to tens of thousands of dollars over the life of the mortgage.
If you’re shopping for a home and rates are high, running the 28% calculation can quickly reveal whether you need to adjust your price range downward or wait for a better rate environment.
What Counts as “Housing Costs”
When lenders and financial planners talk about keeping housing costs under 28%, they don’t just mean principal and interest. The figure includes property taxes, homeowners insurance, and, if applicable, private mortgage insurance (PMI) and homeowners association (HOA) dues. PMI is an extra monthly charge lenders require when your down payment is less than 20% of the home’s price.
These extras can add $300 to $800 or more per month depending on your home’s value, location, and the size of your down payment. A mortgage payment that looks affordable at $1,800 in principal and interest might climb to $2,400 once you add taxes, insurance, and PMI. Always calculate the full monthly cost, not just the loan payment, before deciding if a home fits your budget.
How to Find Your Own Number
Start with your gross monthly income. Multiply it by 0.28 to get the maximum housing payment the standard guideline recommends. Then list every other monthly debt obligation and add the housing figure. If the total exceeds 36% of your gross income, either the mortgage is too large or you need to pay down other debts first.
Next, pressure-test the number against your actual spending. The 28/36 rule uses gross income, but you live on net income, the amount that hits your bank account after taxes, retirement contributions, and health insurance premiums. A payment that’s 28% of gross might be 35% or more of your take-home pay. Look at your real monthly budget and ask whether the payment leaves enough for savings, emergencies, and the non-negotiable expenses that don’t show up in a DTI calculation, like childcare, groceries, and transportation.
Finally, build in a cushion. Homeownership comes with costs that renting doesn’t: a broken furnace, a new roof, routine maintenance. A common rule of thumb is to set aside 1% of your home’s value each year for upkeep. On a $350,000 home, that’s about $290 a month. If your mortgage payment is technically affordable but leaves zero room for these expenses, it’s not truly reasonable for your situation.