The Short Answer: The 28/36 Rule
The classic lender guideline says your monthly housing costs should not exceed 28% of your gross monthly income, and your total debt payments (housing plus car loans, student loans, credit cards) should not exceed 36%. On a $80,000 salary ($6,667/month gross), that means roughly $1,867/month for housing and $2,400/month for all debts combined.
At 2026’s typical mortgage rates near 6.5–7%, $1,867/month covers roughly a $260,000–$300,000 home with 10–20% down, depending on your property taxes and insurance. That is the lender’s answer. Your personal answer — what you can afford without stress — is often lower, and this guide shows you how to find it.
What “Housing Costs” Actually Include
Beginners routinely underestimate the true monthly cost because they fixate on the mortgage payment alone. Lenders calculate PITI plus extras:
- Principal & interest: the mortgage itself — the only part most calculators show prominently.
- Property taxes: 1–2.5% of the home’s value annually depending on your state; in high-tax states this alone can add $500+/month.
- Homeowner’s insurance: typically $150–$300/month, higher in disaster-prone areas.
- PMI: private mortgage insurance ($100–$300/month) if your down payment is under 20%.
- HOA dues: $0 to $500+/month — verify before falling in love with a listing.
- Maintenance: budget 1–2% of the home’s value per year. On a $300,000 home, that is $250–$500/month you must self-insure.
A $1,500 mortgage payment is really a $2,100–$2,400 housing cost once every ownership expense is counted honestly. Run the full number before house-hunting, not after your offer is accepted.
The Three Numbers That Determine Your Price
1. Your Down Payment
Twenty percent down avoids PMI and gets the best rates, but it is not mandatory — many buyers succeed with 5–10% down, especially first-timers using conventional or FHA loans. What matters more than the percentage is that the down payment does not wipe out your emergency fund. Buying a house with zero cash cushion converts every broken water heater into credit card debt. Our guide to simple ways to save money on everyday expenses helps build the down payment faster without lifestyle misery.
2. Your Debt-to-Income Ratio
Lenders divide your total monthly debt payments by gross monthly income. Conventional loans generally cap this at 43–45%; FHA allows up to 50–57% with compensating factors. But “approved for” and “comfortable with” are different planets. A 45% DTI leaves almost no margin for life — one job disruption or medical bill from crisis. Target 36% or below for genuine breathing room each month.
3. Your Credit Score
Your score directly sets your rate: the difference between a 620 and a 760 score can be 1%+ on a mortgage, which costs tens of thousands over 30 years. If your score needs work before you buy, our guide to handling bookkeeping without an accountant helps you track and dispute the items dragging it down.
The Affordability Formula You Can Do on Paper
- Multiply gross monthly income by 0.28 → your max housing payment.
- Subtract estimated taxes, insurance, PMI, and HOA → what remains for principal & interest.
- At 7% interest, every $100,000 borrowed costs about $665/month — divide your P&I budget by 665 and multiply by 100,000 for your max loan.
- Add your down payment → your max home price.
Example: $80,000 salary → $1,867 max housing → minus $450 taxes/insurance/HOA → $1,417 for P&I → roughly a $213,000 loan → plus $50,000 down → about a $263,000 home. Notice how much lower this is than the “you’re approved for $350,000!” figure a lender might quote — the lender’s math ignores maintenance, lifestyle, and your other goals.
Rent vs. Buy: The Honest Math
Affording the payment and benefiting from buying are different questions. In the first five years of a 30-year mortgage, the vast majority of each payment is interest — you build equity painfully slowly while paying closing costs (2–5% of the price), maintenance, and taxes a renter never sees. The standard breakeven horizon is 5–7 years; sell before that and renting usually wins mathematically. Run a rent-vs-buy calculator with honest inputs — including the investment returns on money you would otherwise sink into a down payment — before treating ownership as automatically smarter. Buying is a lifestyle and forced-savings decision as much as a financial one, and it is only the right call when you will stay put long enough for amortization to work in your favor.
Rules of Thumb Worth Knowing
- The 3x rule: buy no more than 3 times your gross annual income ($240,000 on $80k). Conservative, but it has survived every housing cycle.
- The 25% take-home rule: keep housing under 25% of take-home pay — stricter than the 28% gross rule, and the one that actually lets you save for other goals.
- The 5-year rule: if you might move within 5 years, buying rarely beats renting after closing costs and early-year interest.
- The sleep test: if the payment keeps you up at night during the planning stage, it will be worse when the roof leaks.
When You Can Stretch (and When You Cannot)
Stretching above 28% is defensible when: your income is reliably rising (medical residents, early-career tech), you have no other debts, or you are buying well below market with instant equity. It is dangerous when: your income is variable, you are already carrying debt, the local market is at peak prices, or the stretch requires an adjustable-rate mortgage to qualify. Extra income changes the math entirely — our guide to side hustles that build income with no capital shows how a second income stream expands what you can safely afford.
Conclusion
On paper, the 28/36 rule and the 3x-income guideline put a $80,000 salary in roughly the $240,000–$280,000 home range at current rates. In practice, your comfortable number is the one that covers PITI plus maintenance, keeps total debts under 36% of income, and leaves room to keep saving. Get pre-approved to learn the lender’s ceiling, then deliberately buy below it — the CFPB’s home-buying tools and HUD’s housing counselors offer free, unbiased guidance through the process. The Investor.gov portal also explains how homeownership fits into long-term financial planning. The cheapest house you will ever buy is the one you can actually afford to keep.
Frequently Asked Questions
How much house can I afford on $100,000 salary?
Roughly $300,000–$350,000 using the 28% rule at ~7% rates with 10–20% down — but run your full PITI plus debts, since taxes and insurance vary enormously by location.
Is the 28% rule based on gross or net income?
Gross (pre-tax). Many advisors prefer 25% of take-home pay as the real-world target, which is stricter and safer.
Can I buy a house with 5% down?
Yes — conventional loans allow 3–5% down for qualified buyers, though you will pay PMI until you reach 20% equity. FHA loans allow 3.5% with lower credit requirements.
Does my credit score affect how much I can afford?
Directly: a lower score means a higher rate, which means the same monthly payment buys less house. Improving your score before buying is often worth more than a bigger down payment.
Should I buy at the top of my pre-approval?
Almost never. Pre-approval is the lender’s maximum risk tolerance, not your budget. Buying 10–20% below it leaves margin for maintenance, rate surprises, and actually having a life.
