2026-02-21 · CalcBee Team · 8 min read
Home Affordability: How Much House Can You Actually Afford?
Lenders will tell you how much they're willing to lend. That number is almost always more than you should actually spend. True affordability isn't about maximum qualification — it's about maintaining financial flexibility after the mortgage payment clears. Here's how to calculate what you can genuinely afford.
The 28/36 Rule
The standard guideline used by most financial planners:
- 28% Rule: Monthly housing costs (PITI) should not exceed 28% of gross monthly income
- 36% Rule: Total debt payments should not exceed 36% of gross monthly income
| Gross Annual Income | Max PITI (28%) | Max Total Debt (36%) |
|---|---|---|
| $60,000 | $1,400/month | $1,800/month |
| $80,000 | $1,867/month | $2,400/month |
| $100,000 | $2,333/month | $3,000/month |
| $120,000 | $2,800/month | $3,600/month |
| $150,000 | $3,500/month | $4,500/month |
With a $100K income and $400/month in existing debt (car + student loans), your remaining debt capacity for housing is $3,000 - $400 = $2,600/month. But the 28% housing rule limits you to $2,333/month. Use the lower amount.
Get your personalized number with our Home Affordability Calculator.
From Payment to Purchase Price
Working backward from your maximum payment to a purchase price:
Scenario: $2,333/month PITI budget, 6.5% rate, 30-year term, 20% down
| Component | Amount |
|---|---|
| PITI budget | $2,333 |
| Minus property taxes ($350/month estimated) | -$350 |
| Minus insurance ($150/month estimated) | -$150 |
| Available for P&I | $1,833 |
| Maximum loan (from P&I formula) | ~$290,000 |
| Plus 20% down payment | +$72,500 |
| Maximum purchase price | ~$362,500 |
With the same income but a 7.5% rate, the maximum drops to ~$325,000. Rate changes alone can swing affordability by tens of thousands of dollars.
What Lenders Will Actually Approve
Lender qualification maximums are more generous than the 28/36 rule:
| Loan Type | Max DTI (Back-End) |
|---|---|
| Conventional | 43–45% |
| FHA | 43–50% |
| VA | 41% (guideline) |
A lender might approve you at 45% DTI on a $100K income — a $3,750/month total debt load including housing. That sounds fine on paper, but it leaves almost no room for savings, emergencies, or lifestyle spending.
The comfortable zone is 25–30% of gross for housing. What a bank approves and what you can sustain are two very different things.
The Full Affordability Picture
Housing costs extend well beyond PITI:
| Expense | Annual Cost Estimate |
|---|---|
| Maintenance & repairs | 1–2% of home value |
| Utilities (more than renting) | $200–$400/month |
| Landscaping | $100–$300/month |
| HOA (if applicable) | $100–$500/month |
| Furniture & furnishing | Lump sum at purchase |
| Moving costs | $2,000–$10,000 |
A $350,000 home could have $5,000–$10,000 in additional annual costs beyond PITI. Budget for them.
Down Payment Impact on Affordability
| Down Payment | Loan Amount (on $350K) | Monthly P&I (6.5%) | PMI | Total Monthly Cost |
|---|---|---|---|---|
| 3% ($10,500) | $339,500 | $2,145 | ~$200 | ~$2,845 |
| 10% ($35,000) | $315,000 | $1,991 | ~$145 | ~$2,636 |
| 20% ($70,000) | $280,000 | $1,770 | $0 | ~$2,270 |
The 20% down payment saves over $575/month compared to 3% down — through both lower principal and eliminating PMI.
A More Realistic Framework
Instead of starting from maximum qualification, start from your monthly budget:
- Track your actual spending for 2–3 months
- Identify your comfortable savings rate (minimum 15% for retirement + emergency fund)
- Calculate remaining available income after savings, existing debt, and essential spending
- That number is your genuine housing budget — likely less than 28% of gross
Example budget at $100K gross ($6,500 net/month):
| Category | Amount |
|---|---|
| Retirement savings (15%) | $975 |
| Existing debt payments | $400 |
| Essential living expenses | $1,800 |
| Discretionary spending | $700 |
| Available for housing | $2,625 |
This is notably less than the $2,800 that 28% of gross would suggest when retirement savings are properly prioritized.
Tips for Maximizing Affordability
- Improve your credit score to 740+. Better rates mean more house for the same payment — a 0.5% rate improvement adds ~$30K in purchasing power.
- Pay off car loans first. Eliminating a $400/month car payment adds $400 to your housing budget — roughly $65,000 more in purchase price.
- Shop outside the hottest neighborhoods. Adjacent areas often offer 20–30% lower prices with similar amenities and appreciation potential.
- Consider a 15-year mortgage. Lower rates and faster equity building — if you can handle the higher payment.
- Don't skip the home inspection. A $400 inspection can save you from a $40,000 foundation problem.
Frequently Asked Questions
Should I buy at the top of my budget or leave a cushion?
Always leave a cushion. Life changes — job loss, medical expenses, family growth — and a mortgage you're stretched to afford becomes a financial trap. Target 20–25% of gross income for housing, not 28%.
How much do I need for closing costs?
Typically 2–5% of the purchase price. On a $350,000 home, expect $7,000–$17,500. These are due at closing and come on top of your down payment. Our Closing Costs Calculator provides a detailed estimate.
Does household income include both partners?
Yes — if both are on the mortgage, both incomes count. However, both partners' debts also count in the DTI calculation.
What if housing in my area is too expensive for the 28% rule?
Some high-cost markets make the 28% rule impractical. In these areas, stretching to 33–35% may be necessary, but compensate by reducing other expenses, maintaining robust emergency savings, and having a clear plan for income growth.
A lender decides how much you can borrow. Only you can decide how much you should. Buy within your means, not at your maximum, and homeownership becomes a wealth-builder instead of a financial burden.
Category: Real Estate
Tags: Home affordability, House budget, 28/36 rule, Mortgage qualification, Home buying, Real estate, Financial planning