3x Rent Rule Calculator
Most US landlords require gross monthly income of at least three times the rent. This calculator works it both ways: max rent for your income, and required income for a target rent.
Max affordable monthly rent
£1,666.67
- Required monthly income for target rent
- £4,500.00
- Required annual income for target rent
- £54,000.00
- Income-to-rent ratio
- 3.33
- Rent burden (rent / income)
- 30%
- Surplus income after rent
- £3,500.00
- Screening result
- Qualifies under the rule
Most US landlords require gross monthly income of at least 3x the rent. At a $5,000 monthly income, the highest rent passing this rule is $1667/month. The target rent works out to 30.0% of gross income (HUD calls anything over 30% "cost-burdened").
How to use this calculator
Enter your gross (pre-tax) monthly income from all sources — salary, second job, documented side income, alimony if you want it counted. Leave the multiplier at 3 for the standard US screening rule, raise it to 3.5 if your target market is competitive (NYC, SF, Boston often want 3.5x or 40x annual), or drop it to 2.5x for areas with more lenient landlords. Then enter the monthly rent on the unit you are considering. The calculator returns the maximum rent that passes a 3x screen at your income, the minimum income most landlords would require to approve you for the target rent (monthly and annual), the income-to-rent ratio, the rent burden as a percentage of income, and whether the target rent passes the rule.
How the calculation works
The 3x rent rule is a landlord and property management heuristic, not a law. It says monthly gross income should be at least 3x the monthly rent — equivalently, rent should be no more than ~33% of gross income. Inverted, that gives the annual variant common in NYC: annual gross income ≥ 40x monthly rent (which is 3.33x per month). The maths is simple: max rent = monthly income / multiplier, and required income = rent × multiplier. The rule is the practical inverse of the US Department of Housing and Urban Development (HUD) "cost-burdened" threshold of 30% of gross income spent on housing — at exactly 3x income, you sit at 33.3% rent burden, just over the HUD line. The 3x rule does not account for other debt, taxes, utilities, or savings. It is purely a gatekeeper for whether a landlord will approve your application. For a fuller affordability picture that includes other debts and uses a 30% threshold, use the rent affordability calculator.
Worked example
You earn 5,000 gross per month and you are looking at a 1,500 unit. Required monthly income at 3x is 1,500 × 3 = 4,500 — you clear it. Max rent at your income is 5,000 / 3 = 1,666.67, so the 1,500 rent fits comfortably with about 167 of headroom. Rent burden: 1,500 / 5,000 = 30%, exactly at the HUD threshold. If the same unit were 1,800 and the landlord used 3.5x: required income = 6,300, which is 1,300 short — application denied even though you can technically afford it. The annual NYC version: a 2,000/month listing requires 40 × 2,000 = 80,000 annual income.
Frequently asked questions
Where does the 3x rent rule come from?
It is a property management industry rule of thumb, not a federal law. The logic dates back decades and lines up roughly with the US Department of Housing and Urban Development (HUD) "cost-burdened" threshold, which classifies a household as cost-burdened when they spend more than 30% of gross income on housing. At exactly 3x gross income, rent is 33.3% of income, just over the HUD line. Landlords use it as a simple income screen during application review because it is fast to apply from pay stubs and approximates the household ability to pay rent without missing payments. It does not consider other debts, savings, taxes, utilities, or local cost of living.
Is 3x rent gross or net income?
Gross — pre-tax income from all documented sources. Landlords use gross because they cannot easily verify your post-tax take-home, and most tenant screening systems and rental applications ask for gross income on pay stubs or tax returns. If you are self-employed they may average two years of net business income from tax returns instead. From the renter side, gross is generous: if you take home 70% of gross after tax and benefits, a "comfortable" 3x rent on gross income is roughly 43% of your take-home, which is higher than most personal-finance guidelines recommend. The screening rule and the budgeting question are two different things.
What is the 40x annual income rule and how does it relate?
It is the same rule expressed annually instead of monthly, and it is the dominant version in New York City. Annual income ≥ 40 × monthly rent. Algebraically: 40 × monthly rent = 40/12 × annual rent ≈ 3.33 × annual rent / 12 — which means 40x annual is slightly stricter than 3x monthly (3.33x vs 3x). Many NYC landlords also require a guarantor at 80x monthly rent if the applicant only meets a lower ratio. The calculator shows both the monthly and annual income requirements for any multiplier you enter.
Is the 3x rent rule legal? Can a landlord refuse me based on income alone?
In most US states, yes — a landlord can apply an income screen so long as it is applied uniformly to all applicants and does not function as a proxy for a protected class under the Fair Housing Act (race, colour, religion, national origin, sex, familial status, disability). A few jurisdictions have additional rules: New York City passed laws in 2021 requiring landlords to consider housing vouchers as income, Seattle has limits on minimum income requirements, and some California cities cap how high the multiplier can be set. If you receive a housing voucher (Section 8) and a landlord rejects you over the 3x rule without considering the voucher as income, that may violate local source-of-income discrimination laws in many cities and states.
Can I get approved if my income is below 3x?
Often, yes. The 3x rule is a starting filter, not an absolute cut-off. Common workarounds: a guarantor or co-signer with income at the higher 80x-annual threshold; paying additional months of rent up-front (some landlords ask for first, last, and a higher security deposit, where local law allows); a larger security deposit; proof of substantial savings (e.g. 12 months of rent in liquid assets); a long stable rental history with good references; or pooling income with a roommate, where the combined income meets the rule. If you are close to 3x (say 2.7-2.9x), strong credit and references will usually carry an application across the line. Below ~2.5x, expect to need a guarantor.
How is this different from the rent affordability calculator?
The 3x rent rule is the landlord-side screen: will my application be approved? The rent affordability calculator is the tenant-side budget question: what can I actually afford to pay without becoming cost-burdened or stretching the rest of my budget? They are related but not identical. The 3x rule says rent ≤ 33% of gross income (income multiplier of 3). HUD says cost-burdened starts above 30% of gross. Many personal-finance guidelines push tighter still, to 25% of take-home pay, which is roughly 17-19% of gross. Use this calculator when applying for a unit. Use the rent affordability calculator when deciding how much you should actually be looking at.