Bottom line: Lenders use the 28/36 rule: your mortgage payment should not exceed 28% of gross monthly income, and total debt payments should not exceed 36%. These ratios tell you what you can borrow, not what you should spend. The right number for your life depends on your take-home pay, savings goals, and local costs, which lenders do not optimize for.
Quick answer
A quick rule: keep your total housing payment at or below 28% of gross monthly income to satisfy lenders, but aim for 25 to 30% of take-home pay to protect your actual budget. On $8,000 gross per month, lenders will allow roughly a $2,240 housing payment; the take-home approach usually lands meaningfully lower once retirement contributions and savings goals are counted. With the average 30-year rate near 6.72% APR, convert your comfortable payment to a price with the affordability calculator below, and remember the payment must cover taxes, insurance, any HOA or PMI, and a 1 to 2% annual maintenance reserve, not just principal and interest.
The most common mistake in home affordability is buying at the top of what a lender will approve. Lender qualification is not a budget recommendation: it is the maximum a lender is willing to lend based on income and debt. It does not account for your retirement contributions, savings goals, childcare costs, or how much you want to spend on things other than housing.
The Lender's Calculation vs. Your Calculation
What lenders use: the 28/36 rule
28% rule: Your total housing payment (principal, interest, property taxes, homeowners insurance, and PMI if applicable) should not exceed 28% of gross monthly income.
36% rule: All debt payments combined (housing + car loans + student loans + credit cards) should not exceed 36% of gross monthly income.
Example: Gross income $8,000/month.
- 28% of $8,000 = $2,240 max housing payment
- 36% of $8,000 = $2,880 max all debt
With $500/month in existing debt (car + student loans), the housing limit under the 36% rule drops to $2,380.
What you should use: the take-home approach
Run the same calculation on your take-home pay (after taxes, retirement contributions, and insurance). Housing at 28% of gross might be 35–40% of take-home, which is very different for your monthly budget.
A more sustainable guideline: housing should not exceed 25–30% of take-home pay. This leaves room for savings, other expenses, and unexpected costs without financial stress.
The Full Cost of Homeownership
Most affordability calculators focus on the mortgage payment. The actual monthly cost of owning a home includes:
- Typical Range
- Depends on loan size and rate
- Typical Range
- 0.5–2.5% of home value per year ÷ 12
- Typical Range
- $100–250/month
- Typical Range
- $100–500+/month
- Typical Range
- 0.5–1.5% of loan per year ÷ 12
- Typical Range
- 1–2% of home value per year ÷ 12
The maintenance reserve is the most commonly forgotten line item. Homes require ongoing upkeep: roofs, HVAC systems, appliances, plumbing. Budgeting 1–2% of home value per year ($3,500–7,000 on a $350,000 home) prevents large repair bills from becoming financial crises.
- The 28/36 rule is a lender qualification standard, not a personal finance guideline. Many financial planners recommend keeping housing below 25% of take-home pay to preserve savings capacity.
- Property taxes vary dramatically by location, from about 0.3% annually in Hawaii to 2.5% in New Jersey. On a $350,000 home, that is $1,050 vs. $8,750 per year. Include actual local tax rates in your calculation.
- A $1,000/month difference in your mortgage payment amounts to $360,000 over a 30-year loan. Buying below your maximum approval gives you financial flexibility that compounds significantly over time.
A Practical Affordability Formula
Estimate a home-price planning range using entered income, debts, down payment, mortgage rate, property tax, and homeowners insurance.
Use our comparison page for live rates
Illustrative Home Price
$316,468
Use this result as one input in your broader Money Map, not as a one-off number.
What to do
Use this result to narrow your next financial move.
Pre-tax estimates. For illustration only — not financial advice.
- Take your monthly take-home pay (after all deductions)
- Subtract your savings rate target (e.g., 15% for retirement + emergency fund contributions)
- Multiply the remaining amount by 25–30% to find your maximum comfortable housing payment
- Use a mortgage calculator to find the home price that results in that payment at current rates
Example:
- Take-home: $6,500/month
- Savings target (15%): $975
- Available for lifestyle expenses: $5,525
- Housing at 28%: $1,547/month
- At a 7% rate on a 30-year mortgage with 10% down: roughly $215,000 home price
That is significantly less than what the lender might approve at $8,000 gross income. The gap represents financial cushion.
When to Stretch
There are situations where buying toward the top of your range makes sense:
- Strong income growth trajectory (early career in a high-earning field)
- Stable dual income with room to absorb one income loss
- Low cost-of-living area where 28% of gross leaves significant room in take-home
- Exceptional property in a specific location with strong appreciation history
The decision to stretch is not wrong, but it is a trade-off between housing and everything else. Make it with a full picture of all the costs, not just the mortgage payment.
Where Do You Stand?
- Best next move
- Run the take-home formula above
- Why
- Anchor on your budget before falling for a listing price.
- Best next move
- Shop below the approval
- Why
- The gap between approval and comfort is your financial cushion.
- Best next move
- Pay debt down first
- Why
- Each $100/month of debt removed frees about $100 of housing capacity.
- Best next move
- Price in PMI
- Why
- Add 0.5 to 1.5% of the loan per year until you reach 20% equity.
- Best next move
- Compare renting
- Why
- Run the rent-vs-buy numbers before committing; see rent vs buy.
Buy the house your take-home pay affords, not the one your gross income qualifies for. If the two numbers point to very different prices, the difference is what funds your retirement, emergencies, and everything else you care about.
To pressure-test the full picture, run the home affordability calculator and the household affordability stress test. If a home purchase is one of several competing money goals, Money Map shows where it ranks.
Quick answers
How much house can I afford on $100,000 a year? Lender math allows roughly a $2,333 monthly housing payment (28% of $8,333 gross). At current rates that supports roughly a $300,000 to $350,000 price with 10% down, before local taxes and insurance. The take-home approach usually lands lower.
What is included in the 28% housing payment? Principal, interest, property taxes, homeowners insurance, and PMI if applicable. HOA dues also count in most lender calculations.
Should I use gross or take-home income? Lenders use gross. Your budget lives on take-home. Run both: qualify on gross, decide on take-home.
How much do I need for a down payment? Programs start at 3 to 3.5% down, but below 20% adds mortgage insurance. See how much to put down on a house for the trade-offs.
Sources
- Consumer Financial Protection Bureau homeownership guidance for qualification standards and buyer protections.
- HUD homebuying resources for free homebuyer guidance and counseling programs.
- SwitchWize mortgage rate tracking, reviewed against lender and market data on the date below.
Rates referenced on this page were verified on July 9, 2026. Mortgage rates and qualifying standards change frequently; use current rates and your specific financial details for an accurate estimate. This article is educational information, not individualized financial advice.
Frequently Asked Questions
How much house can I afford based on my salary?
Is the 28/36 rule a good guideline or just a lender minimum?
What costs go into the true cost of owning a home beyond the mortgage payment?
When does it make sense to buy near the top of my approved amount?
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