Zero-based budgeting: give every euro a job

Zero-based budgeting rests on a simple idea: when you've finished planning, there should be no "unassigned" euro left. Income minus planned spending equals zero. It's the method popularised by the US app YNAB, which has European alternatives.

That doesn't mean spend everything. It means assign everything.

The principle

Every euro that comes in gets a mission before the month begins:

• This much for rent
• This much for groceries
• This much for leisure
• This much for savings
• This much for that holiday project

When you're done, the total of your assignments must equal your income. Exactly. Savings and projects count as "expenses": you give your money a job instead of letting it drift.

A step-by-step example

Monthly income: €2,400.

• Rent and charges: €780
• Groceries: €350
• Transport: €75
• Energy, internet, phone: €115
• Insurance: €60
• Yearly car insurance provision (€720 ÷ 12): €60
• Restaurants and outings: €180
• Shopping and leisure: €120
• Gifts (provision): €40
• Emergency fund: €250
• Summer holiday: €150
• Long-term savings: €220

Total: €2,400. Left to assign: €0. Every euro has a job.

Why zero, not a surplus

Leaving an amount "left over" with no name is the best way to spend it without noticing. By forcing zero, you consciously decide where every euro goes, including towards your savings.

What to do when you overspend

Groceries cost €400 instead of €350? No panic. In zero-based budgeting, you don't leave a hole: you move €50 from another line (outings, for example) to rebalance. The total stays at zero, and you know exactly which trade-off you made.

If your income is irregular (freelance, bonuses), budget on your lowest month and assign the surplus of good months as soon as it arrives.

Who it suits

This method takes a bit more discipline than 50/30/20. It's ideal if:

• You want to understand exactly where your money goes
• You have precise goals (paying off a loan, building a reserve)
• You like total control

If you're starting out, begin with 50/30/20 instead, then move to zero-based when you want to fine-tune.

Make it sustainable

The trap of zero-based budgeting is that it quickly becomes time-consuming by hand. Recalculating totals, re-sorting transactions, checking every line… you give up fast.

In Trya, you set a budget for each category of the month, and the budget editor shows how much you still have to allocate against your income. Your synced spending lands in its categories, and the Budget tab shows what's left in each. For goals (holidays, gifts, car), you create envelopes and link the relevant transactions to them. Zero-based budgeting, without the maths.

Frequently asked questions