The short answer
On $5,000/month gross income, the 30% rule recommends $1,500/month in rent. But with $800/month in existing debt (car, student loans, credit cards), the 36% total-debt guideline only leaves about $1,000/month for rent — a $500 gap between what looks affordable on income alone and what your full debt picture supports.
Key takeaways
- The 30% rule only looks at gross income — $5,000/month gross gives a $1,500 recommended rent, regardless of what else you owe each month.
- The 36% total-debt guideline is stricter: it caps rent plus all other debt payments at 36% of income, so $800/month in existing debt cuts the rent room to about $1,000.
- The calculator also runs a 50/30/20-style estimate on take-home pay after utilities, and a range from a conservative 25% to an aggressive 35% of income.
- Lenders and larger landlords are more likely to apply a debt-inclusive standard like the 36% rule, especially for lease applications that require a credit and income check.
The 30% rule vs. the 36% debt-inclusive rule
30% rule: rent = income × 0.30 = $5,000 × 0.30 = $1,500
36% rule: rent = (income × 0.36) − existing debt = $1,800 − $800 = $1,000
The classic 30% rule is easy to remember but incomplete — it ignores everything else on your monthly balance sheet. The 36% guideline, closer to what many landlords, lenders, and rental-screening services actually use, caps total debt obligations (rent included) at 36% of gross income. With a $400 car payment, $300 in student loans, and $100 in credit card payments, that $800/month in existing debt eats directly into what is left for rent: $1,800 total allowed minus $800 already committed leaves $1,000, a third less than the 30% rule alone would suggest.
If you carry little or no other debt, the two numbers converge and either rule works as a rough guide. The gap only opens up — and matters most — once car payments, student loans, or credit card balances are already claiming part of your income.
A range of rent budgets, not just one number
On $5,000/month gross income, here is how several common guidelines compare:
| Guideline | Monthly Rent |
|---|---|
| Conservative (25%) | $1,250 |
| 28% Rule | $1,400 |
| Standard (30%) | $1,500 |
| 36% Rule (after $800 debt) | $1,000 |
| Aggressive (35%) | $1,750 |
Rather than anchoring on a single figure, treat this as a range: the conservative end leaves the most breathing room for savings and unexpected costs, while the aggressive end assumes a tighter but still workable budget. The 36% debt-inclusive number is the one most worth checking against your own numbers before you sign a lease, since it is the closest to how many landlords and lenders will actually evaluate your application.
Related calculators
- Debt-to-Income Calculator — check your full DTI ratio, not just what's left for rent.
- Budget Calculator — build a full monthly budget around your rent decision.
- House Affordability Calculator — compare renting to what you could afford to buy.