The 3x rent rule: how income requirements work and where they cross a legal line

Ask a landlord how they screen and most will mention income first, and most will say three times the rent. It's the closest thing renting has to a universal rule. It isn't a law, though. No state requires it, and a landlord who skips it or uses a different ratio isn't breaking anything. What the law does care about is how the rule is applied, and that's where landlords get into trouble.

The math is simple. Compare an applicant's gross monthly income, before taxes, with the monthly rent. On a $1,500 apartment, three times the rent is $4,500 a month, or $54,000 a year. The idea is that rent should take no more than about a third of income, which roughly matches the housing-cost guideline lenders and housing programs have used for decades. Some landlords use 2.5 times in expensive markets where 3x would rule out nearly everyone. Others go higher.

Gross income is the usual measure because it's what pay stubs and offer letters show, but it overstates what a tenant actually has to spend. Someone earning $54,000 a year with large car or student loan payments may be stretched thinner than someone earning less with no debt. That's why some landlords look at debt alongside income, or weigh payment history more heavily than the ratio itself.

The rule raises questions it doesn't answer on its own, and the answers should be written down before the first application comes in. Do roommates or a couple combine their income, or does each need to qualify individually? How do you count self-employment, tips, or seasonal work? Do you accept bank statements, tax returns, or an offer letter for someone starting a new job? Whatever you decide, apply it the same way to every applicant. Inconsistent exceptions are the classic way a neutral policy turns into a fair housing complaint. See tenant screening without fair housing violations.

Where the rule runs into the law

The federal Fair Housing Act bars housing decisions based on race, color, religion, sex, national origin, familial status, and disability, and many states and cities add more protected groups. An income rule is neutral on its face. It becomes a problem when it's applied unevenly, waived for some applicants and not others, or used in a way that screens out a protected group without a real business reason.

Housing vouchers are the sharpest example. Under the Housing Choice Voucher program, the housing authority pays a large share of the rent directly and the tenant pays the rest. A growing number of states and cities ban discrimination based on source of income, which covers vouchers. In many of those places, applying the 3x test to the full rent, instead of to the tenant's share, is treated as discrimination, because the tenant was never going to pay the full rent. If you're in a place with source-of-income protection, check its rules before running an income test on a voucher holder. See renting to Section 8 voucher tenants.

Income requirements also need verification that's fair. Ask every applicant for the same kinds of documents. Pay stubs are easy to fake, so many landlords ask for a bank statement that shows the deposits; see catching a fake pay stub.

Plenty of good tenants don't meet a strict 3x test: retirees living on savings, students, people between jobs with a strong history. Landlords have options that cover the risk without turning them away. A co-signer or guarantor who meets the income test themselves is the most common; see co-signer and guarantor requirements. Verified savings or assets equal to a set number of months of rent is another. A larger security deposit can work too, as long as it stays within your state's cap; see deposit limits by state.

Write the income standard, the documents you accept, and the alternatives into your screening criteria, and give the same sheet to every applicant. Then use a lease that matches what you agreed to, including any guarantor.

Sources

• U.S. Department of Housing and Urban Development, Fair Housing Act overview
• U.S. Department of Housing and Urban Development, Housing Choice Voucher program