In most US states, yes. A 3x rule means gross monthly income of at least three times the rent, so rent takes up to 33.3% of income. Colorado caps any income requirement at 2x the rent. Ontario goes further: its Human Rights Commission says a fixed rent-to-income cut-off is illegal. This is information, not legal advice.
What does the 3x rent rule actually mean?
It is a ratio, and most people never do the division. Three times the rent means the rent is one third of gross income. That is a little looser than the 30% line housing agencies use. CMHC defines housing as affordable when it costs less than 30% of before-tax income, and the US cost-burden measure uses the same 30% threshold. Holding renters to 30% exactly would take a 3.33x rule.
Here is what each multiple asks of an applicant on an $1,800 unit:
| Income multiple | Gross monthly income needed | Annual income needed | Rent as share of income |
|---|---|---|---|
| 2x (the Colorado ceiling) | $3,600 | $43,200 | 50% |
| 2.5x | $4,500 | $54,000 | 40% |
| 3x | $5,400 | $64,800 | 33.3% |
| 3.33x (the 30% line) | $6,000 | $72,000 | 30% |
How many renters would fail a 3x screen?
Close to half of them, on paper. The Harvard Joint Center for Housing Studies reported in America's Rental Housing 2026 that a record 22.7 million US renter households were cost burdened in 2024, meaning they spent more than 30% of income on housing. That is almost half of all renter households. They already live past the line a 3x rule draws, and most of them are paying rent somewhere today.
The default question is the one that matters, and the evidence is thinner than the rule suggests. In its background paper on minimum income criteria, the Ontario Human Rights Commission notes that many landlords use a 25 to 35 percent guideline and states there is no evidence that lower-income tenants who spend more of their income on rent are more likely to default.
Where is an income multiple capped or banned?
Colorado caps it. Under SB23-184, in force since August 7, 2023, a landlord may not require an annual income above 200% of the annual rent. A violation carries a $50 penalty to the applicant, then $2,500 more if the landlord does not cure it, plus damages, court costs and attorney fees. It is also an unfair housing practice the attorney general and the state civil rights division can enforce.
Ontario bans the cut-off itself. The Commission's Policy on human rights and rental housing says it is illegal to apply a rent-to-income ratio such as a 30% cut-off rule, outside rent-geared-to-income units. A landlord may ask for income information, but under Regulation 290/98 must also ask for rental history, credit references and credit checks, and weigh them together. The ruling behind this is Kearney v. Bramalea: a Board of Inquiry found rent-to-income ratios breach the Code in 1998, and the Ontario Superior Court upheld it in 2001.
One criteria sheet copied across states and provinces is how a legal rule in one market becomes a complaint in another. Our fair-housing screening checklist covers the other criteria.
How should you screen income instead?
Write the standard down for each jurisdiction before the listing goes live, then apply it to every applicant the same way. In Colorado, that means a multiple of 2x or lower. In Ontario, it means income as one input next to rental history and credit, never a pass or fail line on its own.
Ask about income early and plainly. The prospect who learns your standard on the first call saves you a showing. LetHub's AI voice agent and chat answer rental inquiries in about 30 seconds, around the clock, and ask every caller the same published questions you set for that market. The screening decision stays with you. Book a demo to see it on your listings.
Income requirements: FAQ
Is requiring 3x the rent legal?
In most US states there is no statute against it, as long as the rule is written down and applied to every applicant. Colorado caps any income requirement at 200% of the rent under SB23-184. In Ontario, the Human Rights Commission says a fixed rent-to-income cut-off is illegal outside rent-geared-to-income housing.
What percentage of income is 3x the rent?
About 33.3%. If gross monthly income is three times the rent, rent is one third of income. That sits slightly above the 30% affordability threshold CMHC and the US cost-burden measure both use. A rule matching 30% exactly would require 3.33 times the rent, or annual income of 40 times the monthly rent.
Can a landlord in Ontario ask about income?
Yes, with conditions. Regulation 290/98 under the Human Rights Code lets a landlord request income information only if it also requests rental history, credit references and credit checks, and considers them together. Income alone may be weighed only when nothing else is available. A fixed ratio used as a cut-off is not permitted.
What is the income limit in Colorado?
Two times the rent. Since August 7, 2023, Colorado landlords may not require annual income above 200% of the annual rent. A landlord who breaks the rule owes the applicant $50, then $2,500 more if it is not cured, plus damages and fees. A violation also counts as an unfair housing practice under state law.
