Rent to income Ratio (Free Calculator for Landlords)

Check whether a tenant can afford the rent against the 30x rule letting agents use, or set your own percentage. Add a guarantor to see whether they cover the shortfall, and work out the highest rent an income supports.

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The advertised rent. Rental bidding above it is banned in England.
The 30x rule is letting-agent convention, not law.
Gross means before tax.
Include benefits, pension and regular self-employed income.
Joint tenants are assessed on combined income.
Guarantor (optional)
Agents commonly ask a guarantor to earn 36x the monthly rent a year.

Estimate only. A rent-to-income ratio is a screening convention, not a legal test. Lenders, insurers and referencing agencies each use their own thresholds, and a ratio on its own tells you nothing about payment history, savings or job security.

England: benefits and children. Under the Renters' Rights Act 2025 it is unlawful to refuse a tenancy, withhold a viewing, or make renting harder because an applicant receives benefits or has children. Applying an income threshold is still lawful, but benefit income counts toward it, and once applicants have met your threshold you must not separate them on those grounds. Councils can issue civil penalties of up to £7,000. Scotland, Wales and Northern Ireland have their own rules.

Apply the same rule to every applicant and write it down before you advertise. Not legal or financial advice.

How to manually calculate a tenant's rent to income ratio

Rent to income ratio is the monthly rent divided by the tenant's gross monthly income, times 100. Most letting agents want annual income of at least 30 times the monthly rent, which puts rent at 40% of gross income.

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income to rent ratio formula
Step 1

Work out gross annual income

Income before tax, from every verified source — wages, pension, regular self-employed income and benefits. Referencing agencies check this against payslips, an employer's reference, or accounts and tax returns.

Step 2

Multiply the monthly rent by 30

That is the annual income the tenant needs under the standard letting-agent rule. For a joint tenancy, use the applicants' combined income against the same figure.

Step 3

Check the percentage it implies

Divide the monthly rent by monthly gross income and multiply by 100. The 30x rule works out at 40% of income. Some landlords use a tighter 3x monthly rent instead, which is 33%, so be clear which one you mean before you rely on it.

Worked example

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A tenant earning £36,000 a year gross, applying for a home at £1,200 a month.

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Rent to income ratio = (£1,200 ÷ £3,000) × 100 = 40%

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30x the monthly rent = £1,200 × 30 = £36,000 a year — met exactly, so there is no headroom at all if the rent rises

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What the affordability test does and doesn't do

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30x is convention, not law

Most letting agents want annual income of 30 times the monthly rent. It is an industry habit rather than a legal threshold, and agencies set it slightly differently.

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You will also see 3x the monthly rent quoted, which is a stricter 33% rather than 40%. The two get used interchangeably and they are not the same test.

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Benefit income counts toward your threshold

Under the Renters' Rights Act 2025 it is unlawful in England to refuse a tenancy, withhold a viewing, or make renting harder because someone receives benefits or has children.

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Setting an income threshold is still lawful — but benefit income counts toward it, and you must not separate applicants on those grounds once they have met it.

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Why should you use our rent to income ratio calculator?

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  • Screens against the 30x rule, a 30% or 35% threshold, or your own percentage
  • Adds a guarantor and checks them against the 36x cover agents usually ask for
  • Works backwards — enter the income to get the highest rent that clears your rule
  • Combines joint applicants' income, and shows the headroom or shortfall in pounds
  • Free, fast and no sign-up

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FAQs

What rent to income ratio do UK letting agents want?

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Most want annual income of at least 30 times the monthly rent, which works out at rent taking 40% of gross income. It is a referencing convention rather than a legal requirement, so agencies and landlords set it slightly differently.

Is the 30x rule the same as three times the rent?

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No, and they are easy to confuse. Annual income of 30 times the monthly rent means monthly income of 2.5 times the rent — so rent is 40% of gross income. Three times the monthly rent is a tighter 33%. Check which one an agency means before you rely on it.

What income does a guarantor need?

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Letting agents commonly ask a guarantor to earn 36 times the monthly rent a year — a higher bar than the tenant's own 30x, because the guarantor has to cover the rent on top of their own housing costs. A guarantor is the normal route where a tenant's income falls short.

Should I use gross or net income?

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Gross — income before tax. Referencing agencies assess gross income, so using take-home pay makes your test far stricter than the standard one and will screen out tenants who would have passed.

Can I refuse a tenant who receives benefits?

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No. Under the Renters' Rights Act 2025 it is unlawful in England to refuse a tenancy, withhold a viewing, or make renting harder because an applicant receives benefits or has children, and councils can issue civil penalties. You can still apply an income threshold — but benefit income must count toward it, and once applicants have cleared it you must not separate them on those grounds. Scotland, Wales and Northern Ireland have their own rules.

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