How Much House Can I Afford? The Comfortable Number vs The Maximum
Updated 30 March 2026
There is an important difference between what you CAN borrow (pre-approval amount) and what you SHOULD borrow (affordability). Lenders approve you based on DTI ratios that allow up to 43% of gross income toward debt. Financial advisors recommend a more conservative approach: keep housing costs under 28% of gross income or, better yet, under 25% of take-home pay. The gap between these two numbers can be $50,000 to $150,000 in home price.
A household earning $100,000/year might get pre-approved for a $420,000 mortgage (43% DTI). But the comfortable affordability number, using 25% of take-home pay ($5,900/month), is a $1,475/month housing budget, supporting roughly a $220,000 mortgage. The pre-approval amount would leave this household "house poor," with over 35% of take-home pay going to housing and little room for savings, emergencies, or lifestyle spending.
The 28/36 Rule Explained
The 28/36 rule is the most widely cited guideline for housing affordability. The first number (28%) means your total housing costs (mortgage payment, property tax, homeowner insurance, PMI, and HOA fees) should not exceed 28% of your gross monthly income. The second number (36%) means your total monthly debt payments (housing plus car loans, student loans, credit cards, and other debts) should not exceed 36% of gross monthly income.
On a $75,000 salary ($6,250/month gross), the 28% front-end limit allows $1,750/month for housing. At a 7% mortgage rate with estimated taxes and insurance, this supports a home price of approximately $328,750 with 20% down. The 36% back-end limit allows $2,250/month total debt. If you have $500/month in car and student loan payments, only $1,750 remains for housing, which aligns with the front-end limit in this case.
Affordability by Income Level
| Gross Income | Take-Home | 28% Housing Budget | Mortgage Amount | Home Price (20% down) |
|---|---|---|---|---|
| $50,000 | $3,350/mo | $1,167/mo | ~$175,000 | ~$218,750 |
| $75,000 | $4,650/mo | $1,750/mo | ~$263,000 | ~$328,750 |
| $100,000 | $5,900/mo | $2,333/mo | ~$350,000 | ~$437,500 |
| $150,000 | $8,200/mo | $3,500/mo | ~$526,000 | ~$657,500 |
Assumes 7% rate, 30-year term, $400/mo taxes and insurance, 20% down payment, no PMI. Single filer with standard deduction for take-home calculation.
The Take-Home Pay Approach (More Conservative)
Many financial advisors, including Dave Ramsey and The Money Guy Show, recommend using 25% of take-home pay rather than 28% of gross income. This approach is more conservative because take-home pay already accounts for taxes, retirement contributions, and health insurance premiums. A $100,000 earner contributing $10,000 to a 401(k) and paying $3,000 in health insurance has a take-home of roughly $5,400/month. 25% of that is $1,350/month for housing, supporting a mortgage of approximately $202,000, compared to the 28%-of-gross method yielding $2,333/month and a $350,000 mortgage.
The take-home approach builds in a financial cushion. It ensures you have enough remaining income for retirement savings (15% of income recommended), emergency fund contributions, insurance, food, transportation, and discretionary spending. Households that stretch to the maximum pre-approval amount often find themselves with minimal savings capacity, one unexpected expense away from financial stress.
Factors Beyond the Monthly Payment
Maintenance costs
Budget 1-2% of home value per year for maintenance and repairs. A $400,000 home costs $4,000 to $8,000 annually ($333 to $667 per month) in expected maintenance. This includes HVAC servicing, roof repairs, plumbing, appliances, and landscaping. Older homes and larger homes cost more. This is not optional spending; deferred maintenance reduces home value and creates bigger, more expensive problems.
Opportunity cost of the down payment
An $80,000 down payment (20% on $400,000) invested in the S&P 500 at 10% average annual return would grow to approximately $207,000 in 10 years. Putting that money into a home that appreciates at 3-4% annually produces roughly $118,000 in equity growth. The stock market historically outperforms housing, but housing provides leverage (you control a $400,000 asset with $80,000) and serves as forced savings through principal payments.
Life changes in the next 5-10 years
Buying at the maximum budget leaves no room for income disruption (job loss, career change, health issues) or expense increases (children, eldercare, education). Buying conservatively means a job loss or salary cut does not immediately threaten your housing. The most common regret among homeowners is not buying too small but buying too expensive.