Letting agents often compare the annual rent with an applicant’s gross annual income, then combine that calculation with credit, identity, employment and previous-landlord checks.
The common income calculation
A widely used illustration is monthly rent × 30. For £1,000 monthly rent, the calculation is £1,000 × 30 = £30,000 gross annual income. The same relationship can be written as annual rent ÷ 40%.
There is no single legally required affordability multiple. An agent, landlord or referencing provider might use 30×, 36×, 40× or its own method. Treat any multiple as a scenario, not a promise of acceptance.
Worked examples
| Monthly rent | 30× income | 36× income | 40× income |
|---|---|---|---|
| £800 | £24,000 | £28,800 | £32,000 |
| £1,000 | £30,000 | £36,000 | £40,000 |
| £1,500 | £45,000 | £54,000 | £60,000 |
Gross income is not take-home pay
Referencing formulas usually begin with income before tax. Your personal budget should use money actually available after tax, National Insurance, pension contributions, debt and essential spending. Passing a referencing formula does not automatically mean the rent is comfortable.
What else can an agent check?
- Identity and right-to-rent evidence where applicable.
- Employment, salary, contract type and start date.
- Self-employed accounts or tax records.
- Credit history, court judgments or insolvency information.
- Previous landlord or letting-agent references.
- Savings or a guarantor where income evidence is insufficient. In England, rent-in-advance restrictions apply to relevant tenancies from 1 May 2026; rules differ elsewhere in the UK.
Joint and variable income
Some agents assess the combined gross income of applicants who will be jointly responsible for the tenancy. Overtime, bonuses, benefits, freelance income and new employment may be treated differently by different providers. Ask the agent what evidence and income types it accepts before paying a holding deposit.
What to do before applying
- Ask for the exact affordability threshold and accepted evidence.
- Use the income required calculator to test the quoted rent.
- Use the rent affordability calculator for your own household budget.
- Confirm any guarantor criteria in writing.
Sources and limitations
See GOV.UK private renting guidance and Shelter’s renting guidance. Referencing practices are commercial policies rather than one national statutory formula.
Last reviewed: 19 July 2026
Related renting help
All renting calculators · Salary needed to rent · Joint-income affordability
If referencing may be difficult
Read our guides to renting with a low credit score and guarantor income requirements.