The short answer: zero-based budgeting means planning where every pound of your monthly income will go before the month starts, until income minus planned spending equals zero. "Zero" doesn't mean spending everything. Money you plan to set aside counts as having a job too.
How it works
- Start with your expected take-home income for the month.
- Assign amounts to fixed costs first, such as rent and bills.
- Assign amounts to variable costs like groceries and transport.
- Assign what's left to goals, future costs or a buffer.
- Keep adjusting until the amount left unassigned is £0.
A simple example
Alex takes home £1,800 this month and plans it like this:
| Job | Amount |
|---|---|
| Rent and bills | £1,050 |
| Groceries and transport | £380 |
| Fun and eating out | £150 |
| Holiday pot | £120 |
| Christmas pot | £50 |
| Buffer for surprises | £50 |
| Left to assign | £0 |
Alex is a made-up example.
Why some people like it
- It makes you look at every category, not just the big ones.
- There's no unexplained money that quietly disappears.
- It's flexible. You can re-plan mid-month if something changes, as long as it still adds up.
Why some people don't
- It takes more time than a looser budget.
- It can feel strict if your income varies a lot.
Neither approach is "right". It depends what you find easier to stick with.
Trying it in a spreadsheet
Add one cell at the bottom of your budget: =Income - SUM(planned amounts). Your goal is to make that cell show zero. Then track actual spending against each planned amount through the month.
Frequently asked questions
Does zero-based budgeting mean I spend everything?
No. Money you plan to set aside is part of the plan. "Zero" just means nothing is left unplanned.
What if I get paid irregularly?
Some people plan using their lowest expected monthly income, then assign any extra when it arrives.
Try it in a template
Our Monthly Budget Planner shows your planned income minus planned spending at the bottom of the budget, so you can see at a glance whether every pound has a job.
Important: This article is general information to help you organise your money. It is not financial advice and doesn't take your personal circumstances into account. Any figures are made-up examples. For free, impartial guidance, visit MoneyHelper. If you're worried about debt, contact StepChange or Citizens Advice.