How to budget when every month's income is different

Standard budgeting advice assumes a number you don't have: a fixed monthly income. When you freelance, work on commission, or run a business, "set a monthly budget" falls apart the first time a big month is followed by a lean one. Here's an approach built for income that moves.

1. Budget from a floor, not an average

Averages lie when income is lumpy. Instead of "I earn about €4,000 a month," work from a conservative floor — the income you can reasonably count on in a slow month. Build your essential spending around that floor so your baseline survives the worst month, not the average one.

2. Separate fixed, variable, and one-off

Knowing which costs are immovable is what lets you flex safely in a tight month:

• Fixed— rent, insurance, loan payments. These don't care how your month went.
• Variable — groceries, transport, going out. The lever you actually pull when income dips.
• One-off— taxes, equipment, an annual fee. Plan these onto the timeline so they don't ambush a good month.

3. Use your pay cycle, not the calendar

If your money resets when a retainer lands on the 20th, your budget period should run the 20th to the 19th. Forcing irregular income into a 1st-to-31st calendar month is what makes the numbers feel random. Match the period to how your money actually flows and it gets predictable again.

4. Decide with "safe to spend," not your balance

Before any discretionary purchase, the only number you need is what your balance is projected to be at the end of the period after everything still coming in and going out.

5. Smooth the lumps with a buffer

The endgame for variable income is a buffer big enough to pay yourself a steady "salary" from. Good months top the buffer up; lean months draw it down. Until you're there, forecasting is what keeps you honest about which kind of month you're actually in.

Kronvis is built around exactly this: set your pay cycle, enter your income sources and bills once, and it projects your balance forward and flags the dips before they happen — no bank login, no daily logging.