Here's a number that surprises most first-time buyers: the average American family spends 15% more than they can comfortably afford on their first home. Not because they're reckless — but because nobody explained the real math before they fell in love with a house. Let's fix that.
This guide will walk you through the 28/36 rule, show you exactly how your salary translates to a home price, and explain what lenders actually look at (hint: it's not just income). By the end, you'll know your number — not a vague range, but a specific, defensible budget.
The 28/36 Rule: Your Starting Point
The 28/36 rule is the most widely used mortgage affordability guideline, endorsed by lenders, financial planners, and the Consumer Financial Protection Bureau. Here's how it works:
The 28% side: Your monthly housing payment — including principal, interest, property taxes, and insurance (PITI) — should not exceed 28% of your gross (pre-tax) monthly income.
The 36% side: Your total monthly debt payments — housing plus car loans, student loans, credit cards — should not exceed 36% of gross monthly income.
Let's apply it to a $75,000 annual salary:
- Gross monthly income: $75,000 ÷ 12 = $6,250
- Max housing payment (28%): $6,250 × 0.28 = $1,750/month
- Max total debt (36%): $6,250 × 0.36 = $2,250/month
At today's rates — around 6.5% on a 30-year fixed — a $1,750/month payment (for principal and interest only, before taxes and insurance) supports a loan of roughly $265,000. Add a 10% down payment and you're looking at a home purchase price around $295,000.
That's your ballpark. Now let's see how it scales.
Salary vs. Affordable Home Price: The Full Table
The numbers below assume a 30-year fixed mortgage, 10% down payment, and 1.5% property tax + insurance added to the payment. We show two rate scenarios: 6.5% (current) and 7.5% (stress test).
| Annual Salary | Monthly Income | Max Housing (28%) | Max Home @ 6.5% | Max Home @ 7.5% |
|---|---|---|---|---|
| $50,000 | $4,167 | $1,167 | ~$195,000 | ~$170,000 |
| $75,000 | $6,250 | $1,750 | ~$295,000 | ~$255,000 |
| $100,000 | $8,333 | $2,333 | ~$390,000 | ~$340,000 |
| $125,000 | $10,417 | $2,917 | ~$490,000 | ~$425,000 |
| $150,000 | $12,500 | $3,500 | ~$585,000 | ~$510,000 |
Notice how a 1-point rate increase — from 6.5% to 7.5% — cuts your purchasing power by roughly $45,000 to $80,000 depending on income. This is why timing your rate lock matters.
What Lenders Actually Look At
Here's the thing most people miss: lenders don't just look at your income. They calculate your DTI (debt-to-income ratio), pull your credit, evaluate your down payment, and check your reserves. Let's break each one down.
DTI Ratio
Your DTI is your total monthly debt payments divided by gross monthly income. Most conventional loans require a DTI under 43%, though some lenders prefer 36%. FHA loans allow up to 50% in some cases. If you have a $400 car payment and $200 in student loans, that $600/month eats directly into your housing budget.
Credit Score
Conventional loans typically require a 620 minimum score. But 'qualifying' and 'getting a good rate' are very different things. See the credit score impact table below.
Down Payment
20% down eliminates PMI and gets you the best rates. But you don't need 20%. FHA loans require just 3.5% (with a 580+ score). Conventional loans go as low as 3% for first-time buyers. The tradeoff: smaller down payment = higher monthly cost.
Reserves
Many lenders want to see 2–6 months of mortgage payments in savings after closing. This 'reserve' requirement catches many first-time buyers off guard — you need cash not just for the down payment, but for the months after. Per the CFPB's homebuying guide, reserves are a key factor in loan approval.
The Hidden Costs Nobody Mentions
The mortgage payment you see on Zillow isn't the real number. Here are the costs that routinely blindside buyers:
- Closing costs (2–5% of loan amount): On a $300,000 home, that's $6,000–$15,000 due at signing. These include origination fees, title insurance, appraisal, and prepaid taxes.
- Property taxes: Vary wildly by location. Texas averages 1.6% annually; California 0.75%. On a $350,000 home in Texas, that's $5,600/year — or $467/month added to your payment.
- Homeowners insurance: Typically $1,200–$3,000/year depending on location and home size. Higher in hurricane/tornado zones.
- PMI: If you put down less than 20%, expect to pay 0.5%–1.5% of the loan balance annually. On a $250,000 loan, that's $1,250–$3,750/year.
- Maintenance (the 1% rule): Budget 1% of your home's value per year for repairs and maintenance. On a $300,000 home, that's $3,000/year — or $250/month you should be setting aside.
- HOA fees: Can range from $100 to $800+/month depending on the community. Always factor this in before making an offer.
Real Scenarios: What This Looks Like in Practice
Scenario 1: Marcus in Denver
Marcus earns $82,000 as a project manager in Denver. His gross monthly income is $6,833. Here's his full picture:
| Item | Amount |
|---|---|
| Gross monthly income | $6,833 |
| Max housing (28%) | $1,913/month |
| Car payment | $350/month |
| Student loans | $200/month |
| Existing debt | $550/month |
| Remaining for housing (36% — existing debt) | $2,250 — $550 = $1,700/month |
Because of Marcus's existing debt, the 36% rule is actually the binding constraint — not the 28% rule. His effective max housing payment is $1,700, not $1,913.
With $40,000 saved and a 680 credit score, Marcus puts 10% down on a $265,000 home in the Aurora suburbs. His PITI payment comes to $1,680/month — $20 to spare. After closing costs of $8,000, he has $32,000 left for an emergency fund and initial repairs.
Scenario 2: The Nguyen Family in Austin
The Nguyen family has dual income: $95,000 + $40,000 = $135,000 combined. Their gross monthly income is $11,250. But they also carry $800/month in existing debt (car + credit cards).
- Max housing (28%): $3,150/month
- Max total debt (36%): $4,050 — minus $800 existing = $3,250 remaining for housing
- They can qualify for more than the 28% rule suggests because their existing debt is moderate relative to their income
- At 6.5% with 15% down on a 30-year loan, a $3,150/month PITI supports a home around $470,000
- They find a 4-bedroom in Round Rock for $455,000. With 15% down ($68,250), their PITI is $2,940/month — comfortably within both guardrails.
How Your Credit Score Affects the Price You Can Afford
Most people know credit scores matter. What they don't know is exactly how much. Let's look at the same $300,000 home across different credit score ranges, using rate data from Freddie Mac's Primary Mortgage Market Survey.
| Credit Score | Approximate Rate | Monthly P&I | Total Paid (30 years) | Extra vs. 760 |
|---|---|---|---|---|
| 760–850 | 6.40% | $1,878 | $675,877 | — |
| 720–759 | 6.65% | $1,924 | $692,726 | +$16,849 |
| 680–719 | 6.90% | $1,972 | $709,887 | +$34,010 |
| 640–679 | 7.40% | $2,072 | $745,892 | +$70,015 |
| 620–639 | 7.90% | $2,174 | $782,836 | +$106,959 |
That bottom row is striking: a 620 credit score on a $300,000 home costs you nearly $107,000 more than a 760 score — almost a third of the home's purchase price. If your score needs work, even 6–12 months of improvement before buying can save you more than any negotiation.
What About FHA Loans?
FHA loans — backed by the Federal Housing Administration (HUD) — are popular with first-time buyers for good reason: lower down payment (3.5% with a 580+ score), more flexible DTI requirements, and easier qualification.
But FHA loans come with a catch: mortgage insurance premiums (MIP).
- Upfront MIP: 1.75% of the loan amount, rolled into the loan
- Annual MIP: 0.55%–1.05% of the loan balance, paid monthly
- On a $250,000 FHA loan: upfront MIP = $4,375 added to your balance; annual MIP ≈ $115–$219/month
- Unlike PMI on conventional loans, FHA MIP often cannot be removed without refinancing — even after you reach 20% equity (if your loan term is over 15 years).
FHA loans make sense if: you have a lower credit score (580–679), limited savings, or are buying in a higher-priced area where the loan limits allow it. Current FHA loan limits range from $524,225 in low-cost areas to $1,209,750 in high-cost markets.
Common Mistakes That Hurt First-Time Buyers
- Maxing out your pre-approval: Lenders approve you for the maximum you technically qualify for. That doesn't mean you should borrow that much. Leave room in your budget for rate increases, job changes, and life surprises.
- Forgetting maintenance: A house is not an apartment. HVAC systems fail. Roofs wear out. Plumbing leaks. If you're spending $2,000/month on your mortgage, budget another $250–$400/month for maintenance reserves.
- Not getting multiple quotes: According to the CFPB, borrowers who get at least three mortgage quotes save an average of $1,500 over the life of the loan — and often far more.
- Buying at the peak of your budget before a dual income: If two incomes make the mortgage possible, make sure you could still manage if one income disappears temporarily.
- Skipping the inspection: Never waive a home inspection, even in a competitive market. A $400 inspection can reveal $40,000 in needed repairs.
Ready to run your own numbers? Use our free mortgage calculator to find your monthly payment, try different rate scenarios, and see how your down payment affects the total cost. For dual-income households, our salary calculator can help you convert annual earnings to the monthly figures you need for DTI math.