50/30/20 Budget Calculator UK
Use your actual take-home pay — what lands in your bank account after tax, National Insurance, pension and student loan — not your gross salary. If you do not know it, work it out with the Take Home Pay Calculator first. Figures are a planning guide, not financial advice.
What is the 50/30/20 rule?
The 50/30/20 rule is a budgeting framework popularised by Elizabeth Warren’s book All Your Worth. It divides your after-tax income into three buckets. Needs are the things you cannot live without. Wants are the things that make life enjoyable but are not essential. Savings are the money you set aside for the future and for paying down debt. The appeal is its simplicity: three numbers, no spreadsheet, no tracking every coffee.
| Bucket | Share | What goes in it |
|---|---|---|
| Needs (50%) | Half your take-home pay | Rent or mortgage, council tax, utilities, groceries, transport, basic phone, minimum insurance, childcare |
| Wants (30%) | Just under a third | Eating out, takeaways, streaming, holidays, gym, new clothes, hobbies, concerts |
| Savings (20%) | A fifth | Emergency fund, pension top-ups, ISA, overpaying debt, saving for a deposit |
On £2,500 a month of take-home pay, that is £1,250 for needs, £750 for wants and £500 for savings. On £3,500 it is £1,750, £1,050 and £700. On £1,800 it is £900, £540 and £360. The savings bucket is the one that matters most over time: £500 a month at 5% growth is about £77,600 after 10 years.
Why 50/30/20 often does not fit in the UK
Here is the honest problem. The rule was written for American households, and UK housing costs are different. Rent alone often takes 41–45% of take-home pay in many UK cities, and in London it can take more than half. If rent is £1,100 of a £2,500 take-home pay, that is 44% gone before council tax, energy, food and transport. Fitting all of your needs into 50% is then close to impossible, and the rule starts to feel like a judgement rather than a tool.
That does not mean you are bad at money. It means the rule’s assumptions do not match your housing market. Two honest responses work better than forcing the numbers:
- Use 60/20/20 instead. Needs 60%, wants 20%, savings 20%. On £2,500 a month that is £1,500 for needs, £500 for wants and £500 for savings. You keep the 20% savings rate — the part that builds your future — and you take the extra 10% out of wants, which is where the flexible spending lives anyway.
- Protect the savings rate first. If even 60/20/20 does not fit, set the savings figure first and build the rest around it. Even £100 a month into an emergency fund beats £0, and an emergency fund of one month’s expenses is the single most useful financial buffer there is.
| Monthly take-home | 50/30/20 needs / wants / savings | 60/20/20 needs / wants / savings |
|---|---|---|
| £1,800 | £900 / £540 / £360 | £1,080 / £360 / £360 |
| £2,500 | £1,250 / £750 / £500 | £1,500 / £500 / £500 |
| £3,500 | £1,750 / £1,050 / £700 | £2,100 / £700 / £700 |
| £5,000 | £2,500 / £1,500 / £1,000 | £3,000 / £1,000 / £1,000 |
Needs versus wants: the grey areas
Most arguments about this rule are really arguments about which bucket something belongs in. A phone is a need; the newest phone on a £60-a-month contract is partly a want. Groceries are a need; a weekly takeaway is a want. A car can be either: if you need it to get to work and there is no bus, it is a need, but the size and age of the car are choices. The useful test is: would your life stop working without it this month? If yes, it is a need. If it would just be less fun, it is a want. Be honest with yourself, but do not be harsh: a budget that allows no fun at all is a budget you will abandon by February.
Debt is the other grey area. Minimum payments on a loan or credit card are needs — you have to pay them. Extra payments above the minimum belong in the savings bucket, because paying down debt is saving in reverse: every pound of debt you clear early is a pound that stops costing you interest.
How to use the split in practice
- Pay yourself first. Set up a standing order that moves the savings amount out of your current account on payday, before you can spend it. Willpower is unreliable; automation is not.
- Give wants a hard limit. The wants bucket is where overspending happens, because it is the only bucket with no fixed bills. A separate account or a weekly cash allowance for wants makes the limit real.
- Review monthly, not daily. One bad week does not break the system. Look at the month as a whole: did needs stay inside their share, did savings go out on payday, and did wants stay roughly in range?
- Re-run the numbers when your pay changes. A pay rise is the easiest time to raise your savings rate, because the money was never in your spending habits. If your take-home pay rises from £2,500 to £2,800, send half the extra £300 to savings before your lifestyle absorbs it.
A worked month on £2,500 take-home pay
Here is what the 60/20/20 split looks like as a real month, for someone renting outside London. Needs, £1,540 in total: rent £950, council tax £140, energy £120, groceries £220, transport £110. That is 61.6% of take-home pay — already over the 50% the classic rule allows, and there is no room in it for a car, childcare or a pet. Wants, £460 in total: eating out and takeaways £100, streaming £25, gym £30, a holiday fund £150, clothes and fun £155. Savings, £500 in total: £300 to the emergency fund and £200 into an ISA. The month adds up exactly to £2,500, and the savings went out on payday before anything else was spent.
Notice what is not in the month: no new phone contract, no subscription pile-up, no daily coffee-shop habit. Those are the three leaks that most often sink a budget, and they all live in the wants bucket, which is exactly where they belong — visible, limited and chosen. If the month goes wrong, it will almost always go wrong in wants, and the fix is to move money between wants rather than raiding savings. And if the rent rises next year, the honest response is to re-run the split with the new rent figure and see which bucket gives way, rather than pretending the old split still works.
Related: Take Home Pay Calculator · Pension Calculator · Compound Interest Calculator
Sources: The 50/30/20 rule as set out in Elizabeth Warren and Amelia Warren Tyagi, All Your Worth; UK take-home pay figures from the Take Home Pay Calculator (2026/27 tax and National Insurance rates, GOV.UK/HMRC). Checked 13 November 2026.