Rent Affordability Calculator - 30% Rule & 50/30/20 Budget

How to use this tool

1. Enter your annual gross income.
2. Optionally enter other monthly debt payments (car loan, student loans, etc.).
3. Enter your current or prospective monthly rent to see if it meets the 30% guideline.

Rent affordability rules

Several common guidelines help determine how much rent is affordable:

• The 30% rule: spend no more than 30% of gross monthly income on rent. This is the most widely cited standard (it originated in the 1969 US Brooke Amendment).
• The 50/30/20 rule: 50% of take-home pay on needs (including rent), 30% on wants, 20% on savings. Rent should be well under 30% of take-home pay in high-cost cities.
• 40× rule: many landlords require annual income to be at least 40× the monthly rent. For $2,000/month rent, you need $80,000/year income.

Hidden costs of renting

• Security deposit (typically 1–2 months rent)
• Renter's insurance ($15–$30/month)
• Utilities (electricity, gas, water, internet) if not included
• Parking fees if separate from rent
• Moving costs

When the 30% rule breaks down

The 30%-of-gross-income guideline originated in the 1969 Brooke Amendment (US public housing) and is no longer realistic in high-cost cities. In New York City, San Francisco, and Boston, renters routinely spend 35–50% of gross income on rent. When the 30% rule is unachievable, prioritize keeping housing costs below 50% of net (take-home) income and cut spending in other categories.

Gross vs. net income

The 30% rule is conventionally applied to gross income (before taxes). Some financial advisors recommend using net income (after-tax take-home pay) as the denominator, which is a stricter standard. For example, a $80,000 gross salary yields roughly $60,000 net; 30% of gross = $2,000/month rent, while 30% of net = $1,500/month.

Rent increase projections

Historically, US rents have increased 3–4% annually on average, but local markets vary widely. When evaluating a multi-year lease, budget for potential rent increases at renewal. Rent-stabilized and rent-controlled apartments limit annual increases; check your city’s rent regulations before signing.