The headline number
In a healthy UK household budget, you should aim to have 20–35% of your monthly take-home pay left after all essential bills — including rent or mortgage, utilities, food, transport, insurance and council tax.
| % left after bills | Status |
|---|---|
| Under 10% | Stress zone — no margin for unexpected costs |
| 10–20% | Tight but workable |
| 20–35% | Healthy target range |
| 35%+ | Comfortable / strong savings runway |
This is the residual that funds your savings, pension top-ups, holidays, hobbies and unexpected costs. If less than 15% is left, you're functionally living paycheck-to-paycheck — most unexpected costs become debt.
Benchmarks by salary band
These figures use 2026/27 UK tax rates + average UK household essentials.
| Salary | Monthly take-home | Average UK essentials | Target left (25%) |
|---|---|---|---|
| £25,000 | £1,818 | £1,400–£1,500 | £455 |
| £30,000 | £2,093 | £1,500–£1,650 | £523 |
| £40,000 | £2,565 | £1,650–£1,800 | £641 |
| £50,000 | £3,293 | £1,800–£2,100 | £823 |
| £60,000 | £3,772 | £2,000–£2,300 | £943 |
| £75,000 | £4,505 | £2,200–£2,700 | £1,126 |
| £100,000 | £5,522 | £2,500–£3,200 | £1,381 |
Average essentials assume a UK household outside London. Inner-London households should add £400–£800/month for housing.
What counts as "essential"?
Essential bills (must-pay even in a tight month): - Rent or mortgage interest + principal - Council tax - Utilities (gas, electricity, water) - Broadband + a single mobile contract - Insurance (home, contents, car if needed) - Essential transport (season ticket / fuel for commute) - Groceries (basic level — Aldi/Lidl equivalent) - Childcare if applicable
Non-essential (cut first in a stretched month): - Streaming subscriptions - Eating out + takeaways - Premium gym - Multiple mobile contracts - Non-commute transport
The most common reason UK budgets fail: treating non-essentials as fixed. Track them as variable and they're easy to cut by 30–50% when needed.
The 50/30/20 rule (and where it breaks in the UK)
The classic US rule is 50% needs / 30% wants / 20% savings.
It mostly holds in the UK on £40,000+ outside London. It breaks for: - London renters under £45,000 — rent alone is often 35–45% of take-home - Single parents — childcare can be 25–35% of take-home - Mortgage holders in negative equity — the principal repayment squeezes savings - Students + early-career under £25,000 — fixed costs exceed 65% routinely
For these groups, the more honest target is "any positive residual" while income grows.
What to do with the residual
In rough priority order: 1. Emergency fund — 3–6 months of essentials in instant-access savings 2. High-rate debt — anything above ~6% APR 3. Pension to employer match — typically free money 4. Lower-rate debt — student loan (depending on plan), low-rate credit 5. Discretionary savings — house deposit, longer-term goals 6. Lifestyle — holidays, treats
Tracking the residual
The biggest practical problem is knowing the figure in real-time. Most UK households estimate it wildly and only see the true number after monthly reconciliation. A budgeting app that connects to your bank shows the figure live.
In short
Target 20–35% of monthly take-home left after essentials. Below 15% is the paycheck-to-paycheck zone. Use the take-home pay calculator to confirm your starting figure, then benchmark essentials against UK averages.