Rent Affordability Calculator
On a £36,000 gross annual income, the UK letting-agent "30x" rule caps affordable rent at £1,200/month (income ÷ 2.5 ÷ 12). The tighter MoneyHelper 30% budget benchmark puts a comfortable ceiling at £900/month instead. Enter your own income and ratio below, or switch to reverse mode to see the income a landlord or guarantor would expect for a given rent.
£1,200 max rent under the letting-agent 30x rule
Gross income: £36,000/year (£3,000/month)
Under the tighter 30% budget rule, your comfortable ceiling is £900/month.
Every rule side by side
| Rule | What it means | Max monthly rent |
|---|---|---|
| Letting-agent 30x / 2.5x | Annual income ≥ 30x monthly rent (= 2.5x annual rent) | £1,200 |
| Budget 30% rule | No more than 30% of gross income on rent | £900 |
Income entered is treated as gross (before tax). None of these three figures is a legal cap: the 30x/2.5x figure is the affordability check commonly used by UK letting agents, the 30% figure is the MoneyHelper (Money and Pensions Service) budgeting benchmark, and 36x is the income multiple commonly asked of a guarantor. Retrieved 18 July 2026. How we calculate →
The letting-agent "30x" rule: 2.5x your annual rent
Most UK letting agents run a quick affordability screen: your gross annual income should be at least 30 times the monthly rent, which is the same test as saying it should be at least 2.5x the annual rent. For a £1,000/month rent, that means an agent typically expects at least £30,000/year gross (£1,000 × 30). It's a first-pass check, not a guarantee of passing full referencing — agents also look at credit history, employment status and previous landlord references.
The 30% budget rule is a benchmark, not a law
There's no UK law capping rent at any percentage of income. MoneyHelper — run by the government-backed Money and Pensions Service — describes a widely used benchmark: spend up to 30% of gross (pre-tax) income on rent to avoid straining your budget, while noting this "isn't always possible, especially in bigger cities or if you're on a lower salary." This calculator defaults to 30% and lets you adjust it from 20% to 40% to match a tighter or looser personal budget.
On £45,000 gross a year, 30% works out to £1,125.00/month — noticeably less than the £1,500/month the letting-agent 30x rule alone would allow, which is why checking both figures matters before you commit to a viewing.
Guarantors: the 36x income multiple
If your own income doesn't clear the letting-agent threshold — common for students, new starters or the self-employed without two years of accounts — many landlords will accept a guarantor instead. Guarantors are typically expected to earn at least 36 times the monthly rent. For a £1,200/month tenancy, that's about £43,200/year gross for the guarantor — noticeably more than the tenant's own 30x threshold would require, because the guarantor is covering the risk rather than living in the property.
Working backwards: the income a given rent requires
Flip the calculation around and you can check a specific listing before you view it. A £1,200/month rent needs about £36,000/year under the letting-agent rule, but £48,000/year under the stricter 30% budget rule — a gap of £12,000 that shows why passing an agent's referencing check doesn't automatically mean the rent is comfortable on your actual monthly budget.
Frequently asked questions
What percentage of income should go on rent in the UK?
There's no legal cap. MoneyHelper (Money and Pensions Service) describes a common benchmark of up to 30% of gross (pre-tax) income, while noting it isn't always achievable, especially in bigger cities. This calculator defaults to 30% and lets you adjust it from 20% to 40%.
What is the 30x rent rule used by UK letting agents?
The 30x rule is the affordability check most UK letting agents run during referencing: your annual gross income should be at least 30 times the monthly rent (the same as 2.5 times the annual rent). For a £1,000/month rent, that's roughly £30,000/year gross.
How much income do I need for a guarantor?
Guarantors are typically expected to earn at least 36 times the monthly rent. For a £1,200/month tenancy, that works out to about £43,200/year gross for the guarantor.
Should I use gross or net income for a rent affordability check?
Use gross (before-tax) income. Both the letting-agent 30x rule and the MoneyHelper 30% benchmark are defined against gross income — entering your take-home pay instead will understate what you can typically qualify for.
How much rent can I afford on £36,000 a year?
Under the letting-agent 30x rule, £36,000/year supports up to £1,200/month in rent. Under the tighter 30% budget benchmark, a more comfortable ceiling is £900/month.
Do letting agents ever accept a lower income multiple than 30x?
Requirements vary by agent and area. Some agents in competitive markets accept a lower multiple, while others — or cases needing extra security — may ask for 36x or more, or require a guarantor. Treat 30x as the common benchmark, not a universal rule.
Does passing the 30x letting-agent check mean I can comfortably afford the rent?
Not necessarily. The 30x check is a referencing screen, not a budget check — it doesn't account for existing debts, bills, council tax or other spending. Comparing the letting-agent figure against the 30% budget rule (adjustable here, and lower after your monthly debts are deducted) gives a more realistic comfort level.
Related UK tools
Check what a landlord's rental income means for their mortgage with the Buy-to-Let Mortgage Calculator, or work out your own take-home pay first if you want to convert gross income into what actually lands in your bank account before budgeting for rent.
Researched & verified by the Calcuris Data & Research Team. How we build and check our tools →