How much rent can I afford? UK 30% rule vs take-home

A common UK guide is the 30% rule: rent of up to 30% of your income before tax, or £750 a month on £2,500 a month gross^[1]. Measured against take-home pay, that rent is a larger share. Whether it is affordable depends on what is left after bills, savings, move-in costs and a buffer.

The percentage is a quick filter for a property search. It is not an affordability test, because it cannot see your bills, your savings plans or the cash a move ties up. This guide turns it into a test on your own numbers: take-home pay first, then every other cost, then three stress tests a percentage never runs.

What is the 30% rule for rent?

MoneyHelper’s rent affordability rule - sometimes called the 30% rule - suggests spending up to 30% of your income before tax on rent^[1]. MoneyHelper is also clear that the rule is just a guide: keeping to 30% isn’t always possible and spending more may be necessary, especially in bigger cities or on a lower salary.

The Office for National Statistics draws the same line for its official figures. It treats private rent as affordable where a renting household would spend the equivalent of 30% or less of its gross income on rent - a rent-to-income ratio it calls the affordability ratio^[2].

Is the 30% rule worked out on gross or take-home pay?

On gross pay. MoneyHelper’s version and the ONS threshold both compare rent with income before tax, which is why a rent sitting exactly on the 30% line feels heavier than 30% once pay arrives.

MoneyHelper’s own example shows the size of the gap. £2,500 a month before tax is £30,000 a year. For 2026/27, the standard Personal Allowance is £12,570^[3]. Outside Scotland, taxable income from £12,571 to £50,270 is taxed at the basic rate of 20%^[3]. Employee National Insurance is 8% on earnings between £12,570 and £50,270 a year^[4]. So for someone outside Scotland with no pension or student loan deductions:

• Income Tax: (£30,000 - £12,570) × 20% = £3,486
• National Insurance: (£30,000 - £12,570) × 8% = £1,394.40
• Take-home pay: £30,000 - £3,486 - £1,394.40 = £25,119.60 a year, about £2,093 a month

As a percentage of take-home pay, the £750 that is 30% of gross pay is 35.8% (£750 ÷ £2,093). Run the rule on take-home pay instead and it gives £628 a month (30% of £2,093) - £122 less from the same salary and the same percentage. A workplace pension or a student loan repayment lowers take-home pay further, which pushes the share higher again.

Neither number is wrong. The gross figure lines up with official statistics. The take-home figure is the money the rent actually leaves from, so it is the one a budget can work with. Take-home pay can also change from one month to the next - why take-home pay can be lower walks through five common causes.

How do I work out how much rent I can afford?

Work down from take-home pay to a rent ceiling, then test the ceiling. Four inputs and one subtraction:

1. Take-home pay you can rely on. The amount that lands each month from basic pay, after tax, National Insurance, pension and any student loan. Bonuses, commission and overtime stay out unless they are guaranteed, because a rent that depends on them depends on a good month.
2. Every cost that isn’t rent. Council tax, energy, water, broadband and phone, contents insurance, travel, food, debt repayments and subscriptions - plus the irregular costs that land a few times a year, averaged to a monthly figure the way sinking funds do.
3. The savings you mean to keep making. A savings habit that stops the month the tenancy starts was never really in the budget, so it goes in as a cost.
4. A buffer. Money for the costs no list catches.

Take-home pay minus items 2, 3 and 4 is the rent ceiling: the most rent the month can carry. Then come three tests the 30% rule never runs.

• A rent rise. In England, a landlord can only increase the rent on an assured periodic tenancy once a year and not in the first year of the tenancy^[5]. A rent chosen at the ceiling leaves nothing for year two.
• A fall in income. A bonus that doesn’t come, hours cut, a spell off sick. MoneyHelper suggests an emergency fund that would ideally pay all your costs for at least three months^[1]. Rent is part of those costs, so a higher rent raises the target and the savings line decides how long it takes to reach.
• A change in the household. If more than one tenant signs the same agreement, all the joint tenants are responsible for the rent^[6]. A couple or flatmates can run the test on each income alone as well as together, to see what happens if one of them stops.

A worked example on a £30,000 salary

The figures below are illustrative - one fictional renter living alone, not typical or average amounts. Take-home pay is the £2,093 a month worked out above, with no pension or student loan deduction so the arithmetic stays visible.

Illustrative month, £2,093 take-home	Amount
Take-home pay	£2,093
Council tax	-£113
Energy	-£85
Water	-£36
Broadband and mobile	-£48
Contents insurance	-£9
Travel to work	-£96
Food shopping	-£240
Other spending	-£260
Savings	-£150
Buffer	-£100
Rent ceiling	£956

Other spending covers clothes, eating out, subscriptions and presents. The ceiling of £956 compares with £750 from the 30% rule on gross pay and £628 from the same rule on take-home pay, so for this renter the rule is the cautious one. Add a £220 car finance payment and the ceiling falls to £736, under the rule’s £750: same salary, same rule, opposite answer.

Now test a £900 rent against that ceiling.

• The month: it fits, with £56 to spare on top of the £100 buffer.
• A rise in year two: an illustrative £45 increase (5%) still fits, with £11 to spare.
• An emergency fund: £900 of rent plus £887 of other costs is £1,787 a month, so three months comes to £5,361. Putting aside £150 a month from nothing, that takes just under three years.
• Moving in, in England: a week’s rent is £900 × 12 ÷ 52 = £207.69. After a refundable holding deposit of up to that amount, the deposit (up to five weeks, £1,038.46) and the first month (up to £900) can take up to £1,938.46 before the keys^[7] - more than a year of the £150 savings line.

The result is not a verdict on £900. It shows what £900 asks of this renter: a buffer kept intact, a rent rise absorbed by £11 of slack, an emergency fund almost three years away and a move that costs more than a year of saving. The 30% rule would have turned £900 down without saying any of that.

Once a rent is chosen, the monthly test gives way to a timing one. Rent is a large dated payment in every pay cycle, so what is safe to spend between paydays depends on when it leaves.

How do people normally work this out?

Two methods, both manual.

A budget planner or spreadsheet. Listing every cost against income is the route MoneyHelper points to for working out what rent is comfortable. It is personal and exact, but only as good as the estimates typed in. It also captures one sitting rather than the months that follow.

Last month’s bank statement. Real spending shows what actually went out. One month misses the annual and quarterly bills, though. Anyone paying from two accounts also sees only half the picture.

How you’d do this in Surplus

Surplus connects to UK current accounts and credit cards through read-only Open Banking provided by Yapily, so the take-home pay at the top of the test is the amount that actually arrives rather than an estimate. Surplus can’t move your money.

The engine detects income and recurring bills from real transactions and pre-sets discretionary spending from your 12-month history. Income minus bills minus spending is the monthly surplus - the room a change in rent has to fit inside. The plan can be edited to reflect what’s coming, so a different rent can be tried against the surplus before anything is signed. Once the tenancy starts, rent is a dated bill like any other, reserved before the safe-to-spend number is shown. The Safe to Spend feature page walks through the same sequence screen by screen.

What if no rent seems to fit?

A gap between the ceiling and local rents is information, not a verdict. Three routes are worth knowing about.

• Benefits. Universal Credit can include money for your rent or other housing costs^[8].
• Help with the deposit. In England, the local council can tell you if you’re eligible for rent or deposit guarantee schemes, or a discretionary housing payment if you get Housing Benefit or Universal Credit^[9].
• A different home. MoneyHelper’s own list includes a smaller property or one outside an ideal area, a house or flat share, or living with family or friends.

Every figure above is cited to its source where it appears and re-verified against that source whenever UK rates move.