How Much House Can I Afford?
Separate lender qualification from personal comfort using cash flow, reserves, and full housing costs.
Qualification is not the same as comfort
Mortgage lenders estimate how much you can borrow based on income, debts, credit, and down payment. That maximum is a lending limit, not necessarily the price that leaves room for savings, repairs, or a job change. Many households choose to buy below their approval amount so housing does not consume the entire budget.
A useful affordability estimate combines three views: what a lender might approve, what common housing guidelines suggest, and what your actual monthly cash flow can sustain after taxes, insurance, maintenance, and life’s irregular expenses.
The 28/36 guidelines (starting points)
You will often see two related benchmarks in mortgage education materials:
- 28% rule: Housing payment (principal, interest, taxes, insurance: PITI) should not exceed about 28% of gross monthly income.
- 36% rule: Total debt payments (housing plus car loans, student loans, credit cards, etc.) should not exceed about 36% of gross monthly income.
These ratios come from long-standing underwriting conventions. Modern programs sometimes allow higher ratios, especially with strong credit or compensating factors. Treat 28/36 as orientation: a way to sanity-check a payment, not as proof that a house is affordable for your goals.
Illustrative application (USD)
Gross income $8,000/month:
- 28% housing guideline ≈ $2,240/month for PITI
- If other debt payments total $600/month, housing plus debt = $2,840, or 35.5% of gross: near the 36% total-debt guideline
Remember: gross income ignores take-home reality. A household in a high-tax state or with large 401(k) contributions has less spendable cash than these ratios assume.
Costs beyond the mortgage payment
Affordability worksheets that stop at PITI miss expenses that homeowners pay regularly:
- Private mortgage insurance (PMI) or mortgage insurance premiums on some loans when down payment is below 20%
- HOA fees: mandatory in many condos and planned communities
- Maintenance and repairs: often estimated at 1% to 2% of home value per year on average, though age and climate matter
- Utilities: may exceed renter bills if the home is larger or less efficient
- Lawn, pest, and equipment: optional until they are not
Bureau of Labor Statistics household expenditure reports consistently show housing as the largest budget category for many Americans. Your metro’s cost of living can shift taxes, insurance, and utility baselines significantly.
Down payment and reserves
A larger down payment reduces the loan amount and may eliminate PMI sooner, but it also moves cash out of liquid savings. Lenders often expect reserves: money left after closing: though requirements vary. A common personal guideline is to keep an emergency fund (often discussed as three to six months of essential expenses) in addition to closing costs, not funded entirely by draining every account for the down payment.
Take-home cash flow test
After estimating full housing cost, ask:
- What is average monthly take-home pay?
- Subtract full housing (PITI + PMI + HOA + estimated maintenance set-aside).
- Subtract other fixed costs: food, transportation, child care, insurance, minimum debt.
- Is enough left for discretionary life and continued savings?
If the answer is tight at today’s income, consider a lower price point even when pre-approval says you can stretch.
Rate, term, and price interact
Interest rate changes shift the same home price into a different payment. A $350,000 loan at 6.5% versus 7.0% can differ by roughly $115 per month on a 30-year fixed: illustrative only; use a loan calculator with your exact offer. Buying at a lower price with a slightly higher rate sometimes beats stretching for the maximum house at the best rate.
When to stay conservative
- Single income or commission-based pay
- Plans for children, caregiving, or reduced work hours
- High-cost location where property taxes rise with value
- Limited cash reserves after closing
Using WorthCheck for education
WorthCheck home affordability estimates help you model income, debts, and housing costs together. Results are informational, not a loan commitment, appraisal, or financial plan. Pair them with a loan officer’s pre-approval and your own comfort test. The right house payment is one you can manage in a normal month and still weather a month that is not normal.
Related tool
- Buying a home: Check cash-flow room after housing costs, even if a lender might approve you.
Related guides
- What Costs Are Missing From a Mortgage Payment?
- What Percentage of Income Should Go Toward Housing?
- How Much Emergency Savings Should You Keep?