Rent affordability calculator
Can your tenant actually afford the rent? Enter the monthly rent and their gross income to see whether they clear the 30× monthly rent benchmark UK letting agents apply, how much income is needed, and whether a guarantor covers the gap at the higher 36× bar. Updates as you type.
The tenancy
The full rent for the property, not per room
Before tax. For sharers, add every tenant's income together.
Guarantor
Common for students, the self-employed, and anyone with a thin credit file.
Meets the usual affordability benchmark
A gross income of £36,000 is 30.0× the monthly rent, at or above the 30× benchmark most UK letting agents apply.
Income needed
£36,000
30× the £1,200 monthly rent
Multiple achieved
30.0×
At or above benchmark
Rent this income supports
£1,200/mo
Tenant's income ÷ 30
What this doesn't tell you
An income multiple is a filter, not a decision. It says nothing about whether the income is real, whether the applicant is who they say they are, how they've handled credit, or whether a previous landlord would take them again. Those are the things that actually predict whether the rent arrives — and the only way to know is to check.
How rent affordability is assessed in the UK
There is no legal affordability threshold for a tenancy in England. What exists instead is a widely-shared convention: a tenant should have a gross annual income of at least 30 times the monthly rent, and a guarantor at least 36 times. Referencing providers, letting agents and rent-guarantee insurers all cluster around those figures, which is why they are worth knowing even though nothing obliges you to use them.
The single most common mistake is applying the multiple to the wrong number. It is 30 times the monthly rent, not the annual rent — the same thing as 2.5 times the annual rent. Multiply the annual figure by 30 and you will price out every applicant you have.
The guarantor bar sits higher for a reason worth understanding rather than just accepting. A guarantor is not living in the property, so the rent they are underwriting sits on top oftheir own mortgage or rent. Assessing them at the tenant's multiple would quietly assume they have no housing costs of their own.
Where the benchmark stops being useful
An income multiple is a filter for one risk: that the rent is simply too large a share of what the household earns. It says nothing about the risks that actually cause most arrears. Whether the income is real. Whether the applicant is who they say they are. Whether they have county court judgments. Whether the last landlord would take them again.
Those are the questions a tenant check answers — a £9 credit check for identity and credit history, or a £19 full reference adding income and affordability verification, employer and previous-landlord references, Right to Rent in England, and anti-fraud. Payslips are among the easiest documents in the world to forge, which is exactly why verified income beats a number typed into a form.
Applying it fairly
Whatever threshold you choose, apply it consistently. Refusing tenants on benefits as a blanket policy has been found unlawfully discriminatory by the courts, and assessing one applicant more harshly than another invites a discrimination claim. A written affordability standard you apply to everyone is both fairer and much easier to defend.
Remember too that under the Tenant Fees Act 2019you cannot charge the tenant for referencing, and the Renters' Rights Act 2025 limits how much rent you can require in advance — so “six months up front” is no longer the fallback it once was when an applicant falls short.
Rent affordability — FAQ
- How much should a tenant earn to afford the rent?
- The benchmark most UK letting agents apply is a gross annual income of at least 30 times the monthly rent — equivalent to 2.5 times the annual rent. On a £1,200 a month property that means about £36,000 a year. It is a rule of thumb rather than a legal test: no law sets an affordability threshold, and you are free to apply a different one, as long as you apply it consistently to every applicant.
- Is the affordability multiple based on monthly or annual rent?
- Monthly. This trips people up constantly. The 30× benchmark means 30 times the MONTHLY rent, which is the same as 2.5 times the annual rent. If you multiply the annual rent by 30 you will end up demanding an income roughly twelve times too high.
- What income should a guarantor have?
- A guarantor is usually assessed at around 36 times the monthly rent, a higher bar than the tenant's 30 times. The reason is simple: a guarantor is underwriting the rent on top of their own housing costs, without living in the property. On a £1,200 a month tenancy that is roughly £43,200 a year.
- Do you add up incomes for sharers?
- Yes, that is the normal approach for a joint tenancy where everyone is jointly and severally liable — add every tenant's gross income together and test the total against the rent for the whole property. Enter the combined figure in this calculator. If tenants are on separate agreements for individual rooms, assess each one against their own room rent instead.
- Should I use gross or net income?
- Gross — income before tax. Every published multiple in UK lettings, including the 30× and 36× figures here, is expressed against gross annual income. Using take-home pay against the same multiple would reject perfectly affordable tenants.
- What if the tenant is self-employed or on benefits?
- The same multiple is normally applied, but the evidence differs. For a self-employed applicant, income is usually evidenced with SA302 tax calculations or accountant-certified accounts, typically covering two or more years. For an applicant receiving benefits, that income counts too — blanket "No DSS" policies have been found unlawfully discriminatory by the courts, so assess the actual affordability rather than the source.
- Does passing this check mean the tenant is safe?
- No, and that is worth being blunt about. This calculator tests one number against one benchmark. It cannot tell you whether the income is genuine, whether the applicant is who they claim to be, how they have handled credit, or whether their last landlord would house them again. Those need an actual check — a credit check confirms identity and credit history, and a full reference adds income verification, employer and previous-landlord references, Right to Rent and anti-fraud.
- Can I charge the tenant for referencing after this?
- No. Under the Tenant Fees Act 2019 charging a tenant for referencing is a banned fee in England — the landlord or agent must pay for the check.
Disclaimer: This calculator is general information for UK landlords, not legal or financial advice. The 30× and 36× multiples are industry conventions, not legal requirements, and no affordability test removes the duty to assess applicants fairly and without discrimination.
Related tools & guides
- Tenant referencing from £9Verify the income rather than take it on trust — credit check £9, full reference £19
- Free guarantor agreement templateIf the tenant needs a guarantor, get the guarantee in an enforceable deed
- Referencing students and guarantorsWhen a guarantor is needed and what to check on them
- Free tenant application formCollect the applicant's details and consent at no cost
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