Home › Guides › How Much House Can I Afford? A Simple Formula
LoansHouse hunting without a budget is how people end up "house poor" — owning an impressive asset while stressing over every bill. Affordability is not what a lender will approve; it is what your life can comfortably carry for decades.
This guide gives you the simple formula lenders use, the hidden costs buyers forget, and a worked example you can adapt to your own numbers in minutes.
Try it yourself: Test any home price: enter the loan amount and see the exact EMI before you fall in love with a listing. EMI Calculator →
The 28/36 rule: the lender's formula
Most mortgage lenders apply two ratios to your gross monthly income:
- Front-end ratio ≤ 28%: total housing cost (EMI + property tax + insurance) under 28% of gross income.
- Back-end ratio ≤ 36%: all debt payments (housing + car + cards + student loans) under 36%.
Max housing payment = gross monthly income × 0.28
Max total debt payment = gross monthly income × 0.36
Max total debt payment = gross monthly income × 0.36
On $8,000/month gross: housing capped at $2,240, all debts at $2,880. These are ceilings — comfortable buyers usually sit well below them.
Worked example: from income to price
Household income: $96,000/year ($8,000/month). Existing debts: $400/month car payment. Mortgage rate: 7%, 30-year term, 20% down.
- Housing budget: $8,000 × 28% = $2,240. Subtract ~$300 for tax + insurance → $1,940 available for EMI.
- Debt check: $8,000 × 36% = $2,880; minus $400 car = $2,480 for housing — the 28% cap binds, so $2,240 stands.
- Loan it supports: $1,940/month at 7% over 30 years ≈ a $291,600 loan.
- Price: with 20% down, price ≈ $291,600 ÷ 0.8 ≈ $364,500.
So this household can afford roughly a $365,000 home — before checking the hidden costs below, which trim it further.
The down payment math
Twenty percent down is the classic target because it avoids private mortgage insurance (PMI) and proves you can save. But the math is a trade-off:
- Bigger down payment: smaller loan, lower EMI, less interest, no PMI — but years of saving while prices may rise.
- Smaller down payment (5–10%): buy sooner, but PMI ($100–300/month) plus a bigger loan inflates the true cost.
Never drain your emergency fund for the down payment. A house with zero cash buffer turns every repair into a crisis — keep 3–6 months of expenses after closing.
Hidden costs buyers forget
- Closing costs: 2–5% of the price (fees, title, taxes) — $7,000–18,000 on a $365,000 home.
- Maintenance: budget ~1% of the home's value per year; older homes more.
- Property tax growth: reassessments can lift your "housing payment" even with a fixed EMI.
- HOA fees: $200–500/month in many developments, rising most years.
- Move-in costs: movers, furnishings, immediate repairs — easily $5,000–15,000.
Add these to the EMI before judging affordability. A home whose all-in cost exceeds 35% of take-home pay will feel tight within two years.
The price-to-income shortcut
For a fast sanity check, divide the home price by your gross annual income. Historically, 3–4× income is comfortable, 5× is stretched, and 6×+ is dangerous without a large down payment or unusually low rates.
Our example: $364,500 ÷ $96,000 ≈ 3.8× — squarely in the comfort zone. If your target market prices you at 6×, the honest answers are: bigger down payment, cheaper area, higher income, or wait — not a bigger loan.
Frequently asked questions
Using the 28% rule: $100,000 ÷ 12 × 28% ≈ $2,333/month for housing including tax and insurance. At 7% over 30 years with 20% down and typical tax/insurance, that supports roughly a $380,000–$400,000 home — less if you carry other debts, since the 36% back-end cap also applies.
Gross (pre-tax) income — that is how lenders apply it. For your own comfort check, run it on take-home pay too; if 28% of gross feels tight against your actual budget, trust your budget over the rule.
Almost never. Maximum qualification assumes nothing goes wrong for 30 years — no job loss, no rate rises on adjustable loans, no major repairs. Buying 10–20% below your max leaves room to save, invest, and sleep well. The bank's risk tolerance is not yours.
Not always. Beyond 20% (which kills PMI), extra down payment earns you only the mortgage rate as a "return" — often less than long-term investing. The sweet spot for most buyers is 20% down with the emergency fund intact, directing surplus cash to investments or extra principal payments.
Disclaimer: Calculator content is for education and planning only — not financial advice. Loan terms, rates, fees and tax rules vary by lender and country; confirm important figures with your lender or a licensed financial adviser before deciding.