Tenant Screening Income Calculator
Apply the screening standards correctly — 3x rent, the 30% rule and 40x annual — and see why two of them are the same test and the third is materially looser.
Tenant Screening Income Calculator
Results recalculate instantly on every keystroke. Nothing you type is transmitted.
What this result does not account for
- Screening is regulated — local rules on vouchers, records and fees vary widely.
- Says nothing about payment history, which is the stronger predictor.
- Assumes documented and verifiable gross income.
In short: 3x rent and the 30% rule are NOT the same standard. 3x permits a 33.3333% ratio; the 30% rule demands 3.3333x. On 1,650 rent that is 4,950 against 5,500 — 550 a month apart.
Formula
3× rule: income ≥ 3 × rent (33.33% ratio)
30% rule: income ≥ rent ÷ 0.30 (3.33× rent)
[('3x rule', 'the lenient standard — 33.33% ratio'), ('30% rule', 'the strict standard — 3.33x rent'), ('40x annual', 'identical to the 30% rule'), ('gross income', 'the screening convention, always pre-tax')]
Worked Example
- Choose ONE written standard and publish it.
- Compute the required gross monthly income.
- Verify the applicant's income documentation.
- Compare against the standard, not against your impression.
- Apply the identical test to every applicant.
On 1,650 rent the 3x rule needs 4,950 a month, a 33.3333% ratio. The 30% rule needs 5,500 — 3.3333x rent — which is 550 a month or 6,600 a year more income. The 40x annual rule needs 66,000, which is 5,500 a month: arithmetically identical to the 30% rule. An applicant earning 5,400 has a 30.5556% ratio, passes 3x comfortably, and FAILS the 30% rule by 100. Adding a co-applicant at 3,200 gives 8,600 combined, a 19.1860% ratio that clears every standard.
Strengths & Limits Of This Model
Where this engine is strong
- Distinguishes 3x from the 30% rule and prices the gap
- Shows 40x annual is the same test as the 30% rule
- States the fair-housing requirement for uniform application
Where it stops
- Ratio only
- Jurisdiction-specific rules not modelled
Practical Use Cases
Setting a screening policy
Choosing a standard and stating it consistently.
Assessing an application
Testing income against your published rule.
Comparing standards
Seeing what 3x costs you versus the 30% rule.
Handling co-applicants
Combining income and understanding joint liability.
Documenting a decline
Producing an objective, uniformly applied reason.
Methodology & Editorial Standards
Each standard is computed from its own definition rather than assumed equivalent: 3x rent, rent divided by 0.30, forty times annual rent divided by twelve, and rent divided by 0.25. The 3x and 30 per cent requirements are always displayed together with the difference between them, because they are routinely described as the same test and are not. Gross income is used throughout, matching universal screening convention, and the page states plainly that a ratio is one input rather than a decision.
Computation runs in IEEE-754 double precision at full internal precision; rounding to two decimal places occurs strictly at the display layer, so no cumulative drift enters the result. All monetary outputs use accounting presentation — grouped thousands, two decimals, negatives in parentheses — so figures can be transcribed directly into a model or working paper. Division-by-zero and out-of-domain inputs return an em-dash rather than a misleading number.
This engine was reconciled against an independent reference implementation and hand-verified for the worked example above before release. Our full five-stage review process is published on the About Us page.
Disclaimer. This calculator is provided for informational and modelling purposes only and does not constitute financial, tax, legal, medical, or engineering advice. Verify all figures with a qualified professional before acting on them.
Tenant Screening Income Calculator — 10 Expert FAQs
10 analyst-written answers to the questions practitioners actually ask — optimised for voice and answer-engine retrieval.
What is the 3x rent rule?
That an applicant's gross monthly income must be at least three times the monthly rent. It is the most common standard among independent landlords because it is fast to verify, and it permits a rent-to-income ratio of 33.33 per cent.
Is the 3x rule the same as the 30% rule?
No, and the difference catches people out. Three times rent is a 33.33 per cent ratio, while the 30 per cent rule requires income of 3.33 times rent. The 30 per cent rule is the stricter standard and an applicant can pass one while failing the other.
What is the 40x rent rule?
That annual gross income must be at least forty times the monthly rent. It is common in New York and sounds like a much larger requirement, but forty divided by twelve is 3.33, making it arithmetically identical to the 30 per cent rule.
Should screening use gross or net income?
Gross, universally. Net income varies with each applicant's deductions and retirement contributions, which makes it unstandardised and easy to manipulate. Gross gives a consistent and verifiable basis, which is what a screening test requires.
Can I combine roommate incomes?
Yes, and most landlords do. Be clear that combined income usually comes with a joint and several lease, meaning each tenant is liable for the entire rent rather than their share — so a strong combined ratio can still leave you exposed if one occupant leaves.
What if an applicant is self-employed?
Ask for two years of tax returns, recent bank statements and a profit and loss statement. Apply the same ratio but weigh the stability behind it: variable self-employed income at a high multiple can be a weaker covenant than a modest salary with long tenure.
Do I have to count housing vouchers as income?
In a growing number of jurisdictions, yes — source-of-income discrimination is prohibited in many states and cities, and the ratio must then be applied to the tenant's portion rather than the full rent. Check your local rules before setting a policy.
Can I require a higher ratio for some applicants?
Not selectively. Fair housing law requires that you apply the same written standard to every applicant. Varying the threshold case by case is precisely how landlords create discrimination liability, even where no discrimination was intended.
What about a guarantor?
A common and reasonable accommodation, typically requiring the guarantor to meet a higher multiple such as 80x monthly rent annually since they carry other housing costs. Offer it as a standing policy rather than an ad hoc favour.
Is income ratio the most important screening factor?
No. Payment history is the stronger predictor of whether rent arrives on time, and stability of employment matters more than the raw multiple. The ratio is a necessary filter, not a sufficient decision.