How much rent
can you actually afford?

Field guide

The 30% rule and when to break it.

The 30% rule says you should spend no more than 30% of your gross monthly income on rent. If you earn $75,000 per year ($6,250/month), the standard rule caps your rent at roughly $1,875/month. It’s the most widely cited rent-affordability heuristic in US personal finance — used by landlords, financial planners, and budgeting apps alike.

But it’s a starting point, not a universal law. Whether 30% is right for you depends on your total debt load, savings goals, city cost of living, and how variable your income is.

Where the 30% rule comes from.

The rule has roots in the Brooke Amendment of 1969, US federal legislation that capped rent in public housing at 25% of household income. The threshold drifted to 30% in the 1980s through a series of Housing and Urban Development (HUD) guideline changes, and eventually became the de-facto cultural benchmark for private rental affordability.

The logic is simple: if housing takes 30% of income, roughly 70% remains for food, transport, insurance, savings, and discretionary spending, a budget that most households can sustain. Spend significantly more on rent, and the remaining slice gets thin enough that a single unexpected expense (car repair, medical bill) becomes a cash-flow crisis.

Understanding the three tiers.

This calculator shows three spending tiers so you can see the trade-offs clearly:

• Conservative: 25%. Leaves the most room for savings, debt paydown, and lifestyle spending. The right choice if you’re aggressively building an emergency fund, paying off high-interest debt, or saving for a down payment. In high-cost cities this can feel unrealistic, but it’s the mathematically safest threshold.
• Standard: 30%. The widely accepted benchmark. Achievable in most metro areas for middle-income earners, and the number most landlords and property managers use when evaluating applications (many require gross income ≥ 3× monthly rent, which is exactly the 30% rule in reverse).
• Aggressive: 35%. The upper limit most financial planners tolerate before calling housing “cost-burdened.” The US Census Bureau and HUD both define households spending more than 30% on housing as cost-burdened and more than 50% as severely cost-burdened. At 35% you’re in the yellow zone: doable with discipline, but vulnerable to income disruption.

Why monthly debts change your ceiling.

The “front-end” ratio (rent alone as a % of income) is only part of the picture. Lenders and financial planners also look at the back-end ratio: total monthly debt obligations including rent, car loans, student loans, and minimum credit-card payments, as a share of gross income.

This calculator applies a back-end cap for each tier:

• Conservative: total debt burden ≤ 35% of gross income
• Standard: total debt burden ≤ 40% of gross income
• Aggressive: total debt burden ≤ 45% of gross income

If you carry $500/month in car and student-loan payments, and you earn $5,000/month, the standard back-end cap is $2,000 total debt (40% × $5,000). Subtract the $500 in existing debts and your maximum rent drops from $1,500 (30% front-end) to $1,500, the same in this case because the front cap binds. But at $900/month in debts, the back cap kicks in first: $2,000 − $900 = $1,100 max rent, well below the 30% front-end figure of $1,500.

Gross income vs. take-home pay.

This calculator uses gross (pre-tax) income, which is how the 30% rule is traditionally stated. But your rent comes out of take-home pay and depending on your tax bracket, benefits elections, and retirement contributions, take-home can be 65–80% of gross.

A practical crosscheck: if your employer withholds aggressively (contributing to a 401k, paying health premiums, high state taxes), compute 30% of your net monthly income as a sanity check. For a $75,000 salary with average withholding, take-home is roughly $4,600–$5,000/month. 30% of that is . Meaningfully lower than the $1,875 the gross-income rule allows.

When the 30% rule breaks down.

The rule works well as a heuristic, but it has real blind spots:

• High earners. Someone earning $200,000/year can easily afford 30% of gross ($5,000/month) on housing, but they probably don’t need to. At high incomes, fixed expenses (car, food, utilities) don’t scale linearly with salary, so the “safe” housing share can be lower.
• Low earners. On a $35,000 salary, 30% is $875/month. In many US cities that’s below market for a studio. The rule doesn’t make affordable housing exist; it just identifies the cost-burden threshold.
• Geographic cost of living. In San Francisco or Manhattan, even dual-income households routinely spend 40–50% of gross on rent. This doesn’t mean the rule is wrong; it means those markets are structurally unaffordable by traditional standards.
• Variable income. Freelancers and commission-based workers should budget conservatively from their floor income, not their average; a high-month average hides the cash-flow risk of a low month.

Disclaimer

This is a planning tool, not financial advice. Your actual affordable rent depends on your full financial picture: savings rate, investment goals, debt payoff timeline, and lifestyle costs, none of which the calculator can know. Use it as a starting point, then stress-test the number against your real monthly budget.