How Much House Can I Afford in ?
The most commonly cited guideline is to spend no more than 28% of your gross monthly income on housing costs (the "front-end" ratio) and no more than 36% on all debt payments combined (the "back-end" or DTI ratio). These thresholds — known as the 28/36 rule — have been the foundation of mortgage underwriting for decades and remain the primary framework lenders use to qualify borrowers.
In practice, many lenders will approve mortgages with back-end DTI ratios up to 43–50%, especially for FHA loans. But just because you can qualify doesn't mean you should borrow that much. The 28/36 rule remains the most financially conservative guideline and minimizes the risk of becoming "house poor" — owning a home you can technically afford but that leaves no room for savings, emergencies, or life.
Home Affordability by Income ()
| Annual Income | Max Home Price (28% rule) | Max Home Price (36% rule) | Down Payment Needed (20%) |
|---|
| $50,000 | $150,000–180,000 | $130,000–160,000 | $30,000–36,000 |
| $75,000 | $225,000–270,000 | $195,000–240,000 | $45,000–54,000 |
| $100,000 | $300,000–360,000 | $260,000–320,000 | $60,000–72,000 |
| $125,000 | $375,000–450,000 | $325,000–400,000 | $75,000–90,000 |
| $150,000 | $450,000–540,000 | $390,000–480,000 | $90,000–108,000 |
| $200,000 | $600,000–720,000 | $520,000–640,000 | $120,000–144,000 |
| $250,000 | $750,000–900,000 | $650,000–800,000 | $150,000–180,000 |
The True Monthly Cost of Owning a Home
The mortgage payment is only part of your monthly housing cost. The true all-in monthly cost includes property taxes (averaging 1.1% of home value nationally, but ranging from 0.3% in Hawaii to 2.4% in New Jersey), homeowner's insurance (~$150/month for a median home), maintenance and repairs (1–2% of home value per year, or $333–$667/month on a $400,000 home), and HOA fees where applicable. PMI adds another $100–$300/month for buyers with less than 20% down. When all of these are included, the true monthly cost of owning a $400,000 home at current rates is typically $3,000–$3,800/month — substantially more than the mortgage payment alone.
💡 The 28/36 Rule vs. What Lenders Will Approve: Lenders will often approve DTI ratios up to 43% (conventional) or 50% (FHA). The gap between what you qualify for and what the 28/36 rule recommends can be $100,000–$200,000 in home price. Qualifying for a larger mortgage doesn't mean you should take it — the 28/36 rule exists because higher housing costs correlate strongly with financial stress, missed savings goals, and difficulty absorbing unexpected expenses.
Down Payment Options Compared
| Down Payment | Minimum For | PMI Required? | Monthly PMI (est.) | Pros / Cons |
|---|
| 3.0% | Conventional (some programs) | Yes | $150–350/mo | Low barrier; higher monthly cost |
| 3.5% | FHA loan | Yes (life of loan) | $125–300/mo | Easiest to qualify; FHA MIP permanent |
| 5–9% | Most conventional loans | Yes | $100–250/mo | Good balance; PMI drops at 20% equity |
| 10% | Jumbo in some markets | Usually yes | $75–175/mo | Lower PMI; still building equity faster |
| 20% | No-PMI conventional | No | $0 | Best rate; saves $100–300/mo vs. lower down |
| 25–30%+ | Jumbo loan preferred | No | $0 | Best rates; maximum equity; less leverage |
Home Affordability FAQs ()
How much house can I afford on a $100,000 salary?
On a $100,000 annual salary with no other debt and a 20% down payment, you can typically afford a home priced at $300,000–$380,000 using the 28% front-end rule at current interest rates (~7%). With existing debt payments (car, student loans) of $400–$600/month, the back-end 36% rule becomes the binding constraint and lowers your max price to roughly $260,000–$320,000. With a smaller down payment (5–10%), PMI adds to the monthly cost, further reducing the home price you can comfortably afford. The exact number depends heavily on your interest rate, property tax rate, and other debts.
What is the 28/36 rule for mortgages?
The 28/36 rule is the most widely used mortgage affordability guideline. The "28" means your monthly housing costs (mortgage principal and interest, property taxes, insurance, and HOA) should not exceed 28% of your gross monthly income. The "36" means your total monthly debt payments (housing plus car loans, student loans, credit card minimums, and any other recurring debts) should not exceed 36% of gross monthly income. Both rules apply simultaneously — your affordable home price is limited by whichever constraint is more restrictive. With no other debts, the 28% front-end rule usually determines your limit. With significant existing debt, the 36% back-end rule typically becomes the binding constraint.
What credit score do I need to buy a house?
The minimum credit score to qualify for a conventional mortgage is typically 620, though lenders prefer 740+ for the best rates. FHA loans accept scores as low as 500 with a 10% down payment, or 580 with the minimum 3.5% down payment. VA loans (for veterans) have no official minimum but most lenders require 620+. USDA loans typically require 640+. The practical impact: a credit score of 760+ qualifies you for the lowest available rate, while a 620 score on the same loan might carry a rate 1–1.5% higher — adding $200–$400/month to your payment on a $400,000 mortgage.
What is PMI and when can I remove it?
Private Mortgage Insurance (PMI) is required on conventional loans when your down payment is less than 20% of the home's purchase price. It protects the lender (not you) if you default, and typically costs 0.5–1.5% of the loan amount per year — $150–$450/month on a $360,000 loan. PMI can be removed once you reach 20% equity based on your original purchase price, either by paying down the principal or through appreciation. You can request removal at 20% equity, and the lender must automatically cancel it at 22% equity under the Homeowners Protection Act. FHA loans are different — MIP (Mortgage Insurance Premium) is required for the life of the loan if you put less than 10% down.
How much should I save before buying a house?
Beyond the down payment, you need: closing costs (2–5% of the purchase price, typically $8,000–$20,000 on a $400,000 home), a cash reserve after closing (most advisors recommend 3–6 months of housing expenses = $9,000–$20,000 for a $400,000 home), and a repair/maintenance fund ($4,000–$8,000 as a starting buffer). Total cash needed before buying a $400,000 home: $80,000 down + $12,000 closing costs + $15,000 cash reserve = approximately $107,000. First-time buyers using FHA can reduce this significantly: $14,000 down + $12,000 closing + $12,000 reserve = $38,000 — though the ongoing monthly PMI cost is higher and the MIP is permanent.
Is it better to put 20% down or keep cash invested?
This is one of the most debated questions in personal finance. The case for 20% down: eliminates PMI ($150–$400/month savings), typically secures a slightly better interest rate, reduces monthly payment, and builds equity faster. The case for a smaller down payment and keeping cash invested: if your investment returns exceed your mortgage rate (historically likely over long periods), you may build more total wealth by investing the difference. The practical answer for most buyers: put down whatever amount results in a monthly payment you can comfortably afford while maintaining 3–6 months of emergency reserves. Don't drain your emergency fund to hit 20% down.
How does my debt-to-income ratio affect mortgage approval?
DTI is one of the three primary factors lenders use (along with credit score and loan-to-value ratio) to determine mortgage eligibility and interest rate. A DTI below 36% is considered excellent and will qualify you for conventional loans at favorable rates. DTI of 36–43% is acceptable for most conventional loans but may affect your rate. DTI of 43–50% typically requires FHA financing or compensating factors (large down payment, excellent credit, substantial reserves). Above 50% DTI, most lenders will not approve the loan. To improve your DTI before applying: pay down or pay off high-payment debts (car loans, credit cards), avoid taking on new debt, or increase income. Each $100 reduction in monthly debt payments improves your qualifying home price by approximately $20,000.
What are closing costs and who pays them?
Closing costs are fees paid at the completion of a real estate transaction, typically 2–5% of the purchase price for buyers. They include: loan origination fee (0.5–1% of loan), appraisal ($400–$700), title insurance ($500–$3,000), attorney fees (where required), prepaid items (property taxes, homeowner's insurance, prepaid interest), and various government recording fees. In a buyer's market, sellers sometimes agree to pay a portion of the buyer's closing costs ("seller concessions") — up to 3% of the purchase price is common. First-time buyer programs in many states offer grants or loans to help cover down payments and closing costs. Always request a Loan Estimate from your lender within 3 business days of application, which itemizes all expected closing costs.