How Much House Can I Afford? (The 28/36 Rule)
Before you fall in love with a master suite or a three-car garage, you need to know your number. Lenders don't just look at your credit score; they look at your Debt-to-Income (DTI) ratio. To ensure you aren't "house poor"—where all your money goes to your mortgage—banks use a standard guideline known as the 28/36 rule. This guide explains how to use it to find your true home-buying budget in 2026.
What is the 28/36 Rule?
The 28/36 rule is a conservative benchmark used by mortgage lenders to assess a borrower's ability to pay. It consists of two parts:
- The 28% Rule (Front-End DTI): Your total monthly housing costs (PITI + HOA fees) should not exceed 28% of your gross monthly income.
- The 36% Rule (Back-End DTI): Your total debt payments (Housing + car loans + student loans + credit cards) should not exceed 36% of your gross monthly income.
A Real-World Example
Imagine you earn $100,000 per year ($8,333/month). According to the rule:
- Front-End (28%): Your maximum housing payment is $8,333 × 0.28 = $2,333/month.
- Back-End (36%): Your maximum total debt is $8,333 × 0.36 = $3,000/month.
If you have a $400 car payment and $200 in student loans ($600 total), the 36% rule allows for a housing payment of $3,000 – $600 = $2,400. Since $2,333 is the lower number, that is your official "affordability" limit.
Factors that affect your buying power
While income is the main driver, other 2026 market factors will change how much "house" that $2,333 buys you:
- Interest Rates: A 1% increase in rates can reduce your buying power by 10%.
- Property Taxes: Buying in a high-tax state (like NJ or IL) reduces the amount of loan you can afford, as more of that 28% goes to the state instead of the house.
- HOA Fees: Condo or townhome fees are considered part of the "housing cost" and directly reduce your maximum loan amount.
Pro Tips for Home Shoppers
The Role of the Down Payment
Your down payment doesn't change your monthly income, but it drastically changes the price of the house you can buy. A larger down payment reduces the principal loan amount, which lowers your monthly P&I, allowing you to buy a more expensive home while staying under your 28% DTI limit.
Affordability by income: 2026 reference table
The following table estimates the maximum comfortable home price based on gross annual income, assuming a 6.85% mortgage rate, 20% down payment, 1.1% property taxes, and $1,500/year homeowners insurance. Results use the 28% front-end DTI rule:
| Gross Annual Income | Max Monthly Housing (28%) | Max Loan Amount | Max Home Price (20% down) |
|---|---|---|---|
| $60,000 | $1,400 | $173,000 | $216,000 |
| $80,000 | $1,867 | $247,000 | $309,000 |
| $100,000 | $2,333 | $316,000 | $395,000 |
| $125,000 | $2,917 | $405,000 | $506,000 |
| $150,000 | $3,500 | $496,000 | $620,000 |
| $200,000 | $4,667 | $675,000 | $844,000 |
These figures are estimates. Actual buying power varies based on your credit score, existing debts, local property tax rates, HOA fees, and the specific lender's underwriting guidelines.
How your credit score affects buying power
Your credit score doesn't just determine whether you qualify for a mortgage — it directly controls the interest rate you're offered, which cascades into your monthly payment and total buying power. Here's how the same $400,000 loan looks across credit score tiers at 2026 rates:
| Credit Score | Estimated Rate | Monthly P&I | Total Interest (30 yr) |
|---|---|---|---|
| 760–850 (Excellent) | 6.50% | $2,529 | $510,000 |
| 720–759 (Very Good) | 6.85% | $2,635 | $548,000 |
| 680–719 (Good) | 7.25% | $2,729 | $582,000 |
| 640–679 (Fair) | 7.80% | $2,867 | $632,000 |
| 580–639 (Poor) | 8.50%+ | $3,076+ | $707,000+ |
The difference between an excellent and a fair credit score on a $400,000 mortgage is $338/month or roughly $122,000 over the life of the loan. If your credit score is below 720, spending 6–12 months improving it before buying could be the highest-return financial move available to you.
DTI limits by loan type
The 28/36 rule is a guideline for conventional loans, but different loan programs have different official DTI limits. Knowing which program fits your profile can significantly expand your purchasing power:
| Loan Type | Front-End DTI Limit | Back-End DTI Limit | Down Payment | Key Requirement |
|---|---|---|---|---|
| Conventional (Fannie/Freddie) | 28% | 36–45% | 3–20%+ | 620+ credit score |
| FHA Loan | 31% | 43–57% | 3.5% | 580+ credit score |
| VA Loan | No set limit | 41% guideline | 0% | Military service requirement |
| USDA Loan | 29% | 41% | 0% | Rural area, income limits |
| Jumbo Loan | 28% | 43% | 10–20%+ | 720+ credit, large reserves |
FHA loans in particular are popular with first-time buyers because lenders can approve back-end DTI ratios up to 57% with strong compensating factors (large down payment, significant reserves, or excellent payment history). However, FHA loans require a mortgage insurance premium for the life of the loan if your down payment is under 10%, which can add $200–$400/month.
Step-by-step: Calculate your home budget
Follow these four steps to determine your personal home-buying ceiling:
- Find your gross monthly income. Use your pre-tax household income. Include all reliable sources: wages, self-employment income averaged over 2 years, alimony, rental income, etc.
- Calculate your 28% limit. Multiply your gross monthly income by 0.28. This is the maximum you should spend on housing costs (P&I + taxes + insurance + HOA).
- Subtract non-mortgage debts from your 36% limit. Multiply your gross monthly income by 0.36, then subtract all monthly debt payments (car loans, student loans, minimum credit card payments). The result is the maximum mortgage payment that satisfies the back-end DTI rule.
- Use the lower of steps 2 and 3 as your true maximum monthly housing budget. Then plug that number into our mortgage calculator to find the corresponding maximum loan amount and home price.
Common mistakes first-time buyers make
- Qualifying for the maximum and spending it all: Lenders will approve you for as much as your DTI allows. That doesn't mean it's comfortable. Many financial advisors recommend targeting 22–25% of take-home pay, not 28% of gross pay, for a truly livable budget.
- Forgetting maintenance costs: Budget 1–2% of the home's value annually for repairs and maintenance. A $400,000 home may need $4,000–$8,000 per year in upkeep — costs that renters never face.
- Ignoring closing costs: Expect to pay 2–5% of the purchase price in closing costs at signing. On a $400,000 home, that's $8,000–$20,000 in addition to your down payment.
- Depleting savings for the down payment: Arriving at closing with no emergency fund is financially dangerous. Aim to keep 3–6 months of expenses in liquid savings even after making the down payment.
Frequently asked questions
What if I have a high income but poor credit?
A high income satisfies the DTI ratios but does not override credit score requirements. Most conventional lenders require a minimum 620 credit score; FHA loans allow 580 with 3.5% down or 500 with 10% down. If your credit is below 620, work on improving it before applying — each 40-point credit score improvement can lower your rate by 0.25–0.50%, saving tens of thousands over the life of the loan.
Does the 28/36 rule apply to my take-home pay or gross pay?
Lenders use gross income (before taxes) for DTI calculations. However, you personally should also check affordability against your take-home pay. A household with a 30% effective tax rate paying 28% of gross income to housing is actually spending 40% of their after-tax income on housing — which leaves very little for savings, retirement, and emergencies.
Can I use projected income or a new job to qualify?
Lenders generally require 2 years of verifiable income history. A new job in the same field may be acceptable with a formal offer letter, especially for W-2 employees. Self-employment income requires 2 years of tax returns averaged together. Projected future income or bonuses that haven't been received typically cannot be counted.