Overview
The 28/36 rule is the most widely cited home affordability guideline: spend no more than 28% of gross monthly income on housing and no more than 36% on total debt. These percentages have been lender standards for decades and provide a useful starting point -- though personal circumstances often justify adjustments in both directions.
28/36 rule calculation at $7,000 gross monthly income
| Calculation | Formula | On $7,000 Gross Monthly Income | At 28% Housing | At 36% Total Debt |
|---|---|---|---|---|
| Front-end (28%) | $7,000 x 28% | $1,960 maximum housing | $1,960 PITI | N/A |
| Back-end (36%) | $7,000 x 36% | $2,520 maximum total debt | N/A | $2,520 all debt combined |
| Remaining for non-housing debt | $2,520 - $1,960 | $560/month for car, student, CC minimums | Tight | Very tight if much debt |
| With 0 other debt | Full back-end budget goes to housing | $2,520 possible housing budget | Generous | No other debt needed |
Lenders use 28/36 to evaluate loan risk -- not to optimize your financial wellbeing. For households with high savings rates, significant retirement contributions, and minimal financial risk, spending 33% of gross on housing may be completely appropriate. For households with variable income, high emergency fund needs, or large upcoming expenses, 20-25% is more prudent.
Key Points
- 28% front-end limit: housing costs (PITI) should not exceed 28% of gross monthly income
- 36% back-end limit: all debt obligations should not exceed 36% of gross monthly income
- The gap between 28% and 36% is the budget for non-housing debt payments
- Higher income earners can often sustain 30-35% housing safely due to lower proportional necessity spending
- Lower income earners may need to target 20-25% housing to maintain savings and emergency fund capacity
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