Why income predicts payment better than a credit score
A credit score tells you how someone has handled debt in the past, which is useful. Verified, stable income tells you whether the rent is payable at all next month, which is decisive. An applicant with a 780 score and 45% of their income going to rent is in a tighter spot than one at 640 paying 25%.
This is why the ratio is the first filter and the score is the second. Run the number before you order a report — it costs nothing and it is the one criterion that never depends on interpretation.
What counts as income, and what you should verify
- Employment income — verify with two or three recent pay stubs, not the figure on the application form.
- A signed offer letter for a job that has not started yet, stating the salary and the start date.
- Self-employment — bank statements over several months, or the previous year's tax return.
- Benefits, pensions, child support, housing assistance and other recurring payments, evidenced by award letters or statements.
Always compute on gross income, before tax and deductions, and say so in your written criteria. Mixing gross and net between applicants is how an inconsistent standard becomes a discrimination claim.
Where the 30% rule breaks down
The 30% guideline dates from federal housing policy and was never designed as a screening tool. It is a reasonable default and a poor absolute:
| Situation | Why 30% misleads | What to do instead |
|---|---|---|
| High-cost metros | A large share of perfectly reliable renters exceed 30% simply because of the market | Loosen to 35–40% and apply it consistently to everyone |
| High earners | Someone on $200,000 paying 35% has far more left over than someone on $40,000 paying 28% | Look at absolute residual income as well as the ratio |
| Multiple applicants | Two incomes covering one rent is a different risk from one income | Total the household income, and consider joint and several liability in the lease |
| Guarantor or co-signer | The applicant fails the ratio but the guarantor covers it | Apply a higher multiple to the guarantor, and screen them too |
Applying an income standard without a fair housing problem
An income requirement is one of the safest criteria a landlord can use, on one condition: it must be written down before you advertise the unit and applied identically to every applicant.
- Decide your multiple in advance — 3× is the norm — and put it in the listing.
- Use the same figure for everyone. Adjusting the threshold applicant by applicant is where trouble begins.
- Count all lawful sources of income, and check whether your state or city protects source of income.
- Record the number you calculated and the decision you made, for every applicant, not just the ones you declined.
- If you decline based on something in a consumer report, send an adverse action notice — that is an FCRA requirement, not a courtesy.
None of this is about being nice. Consistency is the only defence that works when a rejected applicant asks why, and the record you kept at the time is the only version of events that will still exist a year later.