How Much House Can I Afford? A Practical Guide
Calculate how much house you can actually afford using debt-to-income ratios, realistic budgets, and tools that go beyond lender maximums.
Table of contents
Lenders will approve you for more house than you can comfortably afford. The standard rule, 28% of gross income on housing costs and 36% total debt, is a starting point, not a spending target. A mortgage that maxes out your approval leaves no room for savings, maintenance, or life.
At Budget Planner HQ, we help readers answer a different question: not “how much can I borrow?” but “how much can I pay monthly without sacrificing other financial goals?” That number is usually lower than what a lender tells you.
Calculate your true monthly housing cost
Mortgage payments include four components: principal, interest, taxes, and insurance (PITI). But the real cost goes further. HOA fees, maintenance (budget 1-2% of home value annually), utilities, and potential special assessments all add up. A $300,000 home with a $1,800 PITI payment actually costs $2,200-$2,400 monthly when you include maintenance and utilities.
The loan amortization calculator shows your principal and interest payment based on loan amount, rate, and term. Add estimated taxes, insurance, and owners association fees to get your full monthly obligation.
Use debt-to-income ratios as guardrails
Front-end ratio (housing costs divided by gross income): aim for 28% or less. Back-end ratio (all debt payments divided by gross income): keep under 36%. Some lenders approve borrowers at 43-50% DTI, but that leaves minimal margin for unexpected expenses or income changes.
Calculate both ratios with your actual numbers. The budget planner shows how a mortgage payment fits alongside your other expenses and savings goals.
Worked example: $95,000 income, $350,000 home
Suppose your household earns $95,000 gross ($7,917/month) and you’re considering a $350,000 home with 10% down, a 6.5% 30-year mortgage, $4,200 annual local property tax, $1,400 annual insurance, and $150/month owners association fees.
| Cost | Monthly estimate |
|---|---|
| Principal & interest | ~$1,990 |
| local property tax | $350 |
| Insurance | $117 |
| owners association fees | $150 |
| Maintenance (1.5%/yr) | $438 |
| Total housing cost | ~$3,045 |
Front-end DTI: $3,045 / $7,917 = 38.5%. That exceeds the 28% guideline. If you also carry $400/month in car and student loan payments, back-end DTI reaches 43.5%.
A lender might still approve this loan. Your budget may not survive a roof repair, job change, or rate reset on an adjustable loan. A more comfortable target at this income might be a $280,000-$300,000 purchase with total housing near $2,400/month (roughly 30% front-end DTI).
The rent vs buy decision
Before buying, compare total costs of renting versus buying in your area. The rent vs buy decision tool calculates the break-even point: how long you need to stay in a home for buying to cost less than renting. In many markets, renting is cheaper for the first 5-7 years.
Down payment and low-deposit mortgage insurance impact on affordability
Your down payment size changes both monthly payment and total interest paid. On a $350,000 home at 6.5% for 30 years:
| Down payment | Loan amount | Est. P&I | low-deposit mortgage insurance (if applicable) |
|---|---|---|---|
| 5% ($17,500) | $332,500 | ~$2,100 | ~$150-$250/mo until 20% equity |
| 10% ($35,000) | $315,000 | ~$1,990 | ~$100-$175/mo until 20% equity |
| 20% ($70,000) | $280,000 | ~$1,770 | None |
A larger down payment lowers monthly strain but ties up cash you could keep invested or in an emergency fund. Model scenarios in the loan amortization calculator before deciding how much to put down.
Stress-test your budget before you shop
Lenders qualify you on gross income and current debts. You should qualify yourself on take-home pay and real life. Ask:
- Could we cover housing if one income paused for six months?
- Are we still funding retirement at least to the employer match?
- Do we have $10,000+ set aside for move-in repairs and furniture?
If any answer is no, reduce your target price even if pre-approval says otherwise. Budget Planner HQ recommends mapping the full housing line in the budget planner next to groceries, transport, and savings. A house that fits the lender’s ratio but breaks your monthly plan will feel tight within the first year.
- Using the lender maximum as your budget. Pre-approval is a ceiling, not a recommendation.
- Ignoring maintenance. Budget at least 1% of home value per year; older homes need more.
- Forgetting closing costs and moving expenses. These hit savings before your first mortgage payment.
- Assuming stable income. Dual-income households should stress-test one income covering housing plus essentials.
- Comparing mortgage to rent only. Ownership includes taxes, insurance, owners association fees, and repairs that renters skip.
Mini-FAQ
Should I use gross or net income for affordability? Lenders use gross income. Your budget should use take-home pay. If housing strains net income, you feel it every month regardless of what a ratio says.
Is 20% down required? No. Many loans accept 3-10% down, but smaller down payments mean higher monthly costs and low-deposit mortgage insurance on conventional loans.
What if I have student loans? Include minimum payments in your back-end DTI. Aggressive extra payments are a choice, but lenders count required minimums.
Does a bigger house build more wealth? Not automatically. A home you can afford to maintain and keep through market dips is a better asset than one that forces you to pause retirement savings or carry credit card debt.
What to do next
Calculate your maximum comfortable monthly housing payment (not the lender maximum), then use the rent vs buy decision tool to determine if buying makes sense in your current market. Map the payment inside the budget planner alongside retirement and emergency savings. A house is a home first, an investment second.