When you're figuring out how much house you can afford, the most important number isn't the sale price of the home — it's what percentage of your monthly income will go toward your mortgage payment. Spend too large a share of your income on housing and you leave yourself little room for saving, investing, emergencies, or simply enjoying your life.
The mortgage industry uses a specific number — 28% — as the traditional threshold for a healthy PITI-to-income ratio. Understanding where that number comes from, how to calculate your own, and what it means for your budget is essential before you start making offers on homes.
The 28% Guideline: Where It Comes From
The 28% front-end rule comes from conventional lending standards set by Fannie Mae and Freddie Mac, which govern most conforming mortgages in the United States. It specifies that your total monthly housing payment — PITI (Principal, Interest, Taxes, and Insurance) — should not exceed 28% of your gross monthly income.
This threshold was established as a point below which most households can service their mortgage while maintaining financial stability. It is one half of the broader 28/36 rule, which also limits total debt-to-income to 36%.
Quick Calculation
To find your maximum PITI under the 28% rule: multiply your gross monthly income by 0.28. If you earn $6,500/month, your maximum PITI is $6,500 × 0.28 = $1,820/month.
How to Calculate Your Own PITI-to-Income Ratio
Calculating where you stand is straightforward:
- Determine your gross monthly income (before taxes). For salaried employees, divide your annual salary by 12. For self-employed individuals, lenders typically average the past two years of net income from tax returns.
- Add up your full monthly PITI: principal + interest + monthly property tax + monthly insurance premium. If your down payment is under 20%, include PMI as well.
- Divide PITI by gross monthly income and multiply by 100 to get your percentage.
Formula: (PITI ÷ Gross Monthly Income) × 100 = Front-End DTI %
PITI Ratio Bands: What the Numbers Mean
Under 20%
Excellent
Maximum budget flexibility. Strong savings potential. Easiest loan approvals.
20–25%
Very Good
Comfortable housing cost. Leaves ample room for retirement savings and other goals.
25–28%
Good
Within the traditional guideline. Works well if other debts are minimal.
28–33%
Moderate
Above the traditional 28% threshold but often approvable. Leaves less room for other financial goals.
33–40%
High
Approved with strong credit and low other debt, but creates real budget pressure for most households.
Over 40%
Very High
Difficult to qualify. Significant financial stress risk. Most lenders require exceptional compensating factors.
PITI Ratios at Different Income Levels
The following table shows what a 25% and 30% housing ratio looks like in dollar terms at various income levels, and what approximate loan amounts those PITI payments support. Property taxes and insurance are estimated at $500/month; actual costs vary by location and home type.
| Annual Income | Monthly Gross | 25% PITI | 30% PITI | P&I at 25%* | P&I at 30%* |
|---|
| $50,000 | $4,167 | $1,042 | $1,250 | $542 | $750 |
| $75,000 | $6,250 | $1,563 | $1,875 | $1,063 | $1,375 |
| $100,000 | $8,333 | $2,083 | $2,500 | $1,583 | $2,000 |
| $125,000 | $10,417 | $2,604 | $3,125 | $2,104 | $2,625 |
| $150,000 | $12,500 | $3,125 | $3,750 | $2,625 | $3,250 |
*P&I column subtracts $500/month for estimated taxes and insurance. Actual loan amounts depend on your interest rate and term.
When Can You Justify Going Above 28%?
The 28% guideline is a starting point, not an absolute rule. There are situations where a higher ratio is financially reasonable:
- Very high income with minimal other debt: If you earn $200,000/year and have no car payments, student loans, or credit card debt, a 32% PITI ratio may leave you with more take-home dollars than a lower-income household at 26%.
- High-cost-of-living markets: In many major metro areas, it is practically impossible to own a home at 28% of median income. Buyers in these markets often carry ratios of 30–35% by necessity.
- Rising income trajectory: If you are early in a career where significant income growth is highly likely (medicine, law, engineering), a higher ratio today may be very manageable within a few years.
- Very low other expenses: If your household has no car payment, no student debt, and very low discretionary spending, a higher housing ratio can still leave plenty of room.
When you should stay well under 28%
- You have significant other debt (car, student, personal loans).
- Your income is variable or commission-based.
- You have limited emergency savings.
- You're buying in an area with high HOA fees or flood/hurricane insurance requirements.
- You plan to have children or other major expense increases.
Key Fact
The 28% guideline is based on gross income — your pre-tax earnings. Depending on your tax bracket and state income tax, your take-home pay might be only 65–75% of your gross. At 28% of gross, housing is actually consuming 37–43% of your actual take-home dollars. This is why many financial planners suggest targeting 20–25% of gross rather than pushing to the 28% limit.
How Lenders Actually Evaluate Your Ratio
When you apply for a mortgage, your lender calculates your front-end DTI and compares it against the requirements of the loan program you're applying for. Here's how common loan types handle the front-end limit:
- Conventional (Fannie/Freddie): Front-end guideline is 28%; can stretch to 35–38% with excellent credit and strong reserves.
- FHA: Front-end guideline is 31%; can be approved up to 40% with strong compensating factors.
- VA: No official front-end limit; lenders focus on the residual income calculation instead.
- USDA: Front-end guideline is 29%.
- Jumbo: Varies by lender, often 30–38% depending on loan size and other factors.
Practical Steps to Hit Your Target Ratio
If your current target home would push your PITI above 28%, here are the levers available to you:
- Increase your down payment: A larger down payment reduces your loan amount and monthly P&I, and eliminates PMI once you hit 20%.
- Target a lower-priced home: Even a modest price reduction has a meaningful impact on monthly payment.
- Improve your credit score: A better rate means a lower payment for the same loan amount.
- Pay off other debt first: Reducing back-end DTI can make approval easier even if front-end stays firm.
- Shop for lower property tax areas: Property taxes can vary enormously between neighboring counties.
- Extend your timeline: More months of saving means a larger down payment and smaller loan.
Calculate Your PITI and Income Ratio
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Frequently Asked Questions
What percentage of income should go to mortgage?
The standard guideline is that your total monthly housing payment (PITI) should not exceed 28% of your gross monthly income. Many financial planners suggest targeting 25% or lower to keep your budget more flexible.
How do I calculate my PITI-to-income ratio?
Divide your total monthly PITI payment by your gross monthly income, then multiply by 100 to get a percentage. For example, if your PITI is $1,800 and your gross monthly income is $7,000, your ratio is ($1,800 ÷ $7,000) × 100 = 25.7%.
Can I get a mortgage if my PITI is more than 28% of income?
Yes. The 28% guideline is not a hard legal limit. FHA loans allow front-end DTI up to 31%, and many conventional lenders will approve up to 35–38% with strong credit and reserves. However, qualifying for a higher ratio doesn't necessarily mean it's financially comfortable for your household.
Does PITI include PMI in the income ratio calculation?
For DTI purposes, lenders include PMI in your monthly housing expense when calculating your ratio. If you're putting down less than 20%, add your estimated monthly PMI to PITI before dividing by your gross income.
Is 30% of gross income too much for a mortgage?
At 30%, you're above the traditional 28% guideline but not necessarily in dangerous territory. Whether it's sustainable depends on your other expenses, savings goals, job stability, and local cost of living. In high cost-of-living areas, many homebuyers routinely carry front-end ratios of 30–35% without financial distress.