How do I budget when my income is irregular?

Standard budgeting assumes a predictable monthly income. With freelance, seasonal or commission income the problem is not the total but the timing, and the solution is a buffer that smooths it into something regular.

What you'll need

• A separate account for income
• A year of income records (optional)

Step by step

1. Work out your genuine minimum monthly costs.Housing, utilities, food, transport, insurance, minimum debt payments. This is the floor your system has to reliably cover.
2. Look at your worst months over the past year or two.Not the average — the low points. A system that only works in an average month fails predictably.
3. Set a monthly salary you pay yourself.Something close to a low-but-workable month. All income goes into a holding account; a fixed amount transfers to your spending account monthly.
4. Build the buffer during good months.Anything above your salary stays in the holding account. This is what makes the fixed payment sustainable through lean months.
5. Aim for a buffer of at least three months of costs.For very variable income, six. It is the difference between a manageable quiet period and a crisis.
6. Set aside tax at the point of being paid.For self-employed income, move the tax portion into a separate account immediately. Spending money that is owed in tax is the classic and painful mistake.
7. Separate business and personal money completely.Different accounts. It makes tax straightforward and stops you mistaking turnover for income.
8. Review the salary figure every six months.Raise it if the buffer keeps growing; lower it if it keeps depleting. It is a dial to adjust, not a fixed decision.

Tips

• Separate your fixed costs from your variable ones. Knowing the true minimum is what tells you how bad a quiet month can be before it is a problem.
• Annual and quarterly costs need a sinking fund of their own alongside this. Irregular income plus irregular bills is what causes most difficulty.
• If income drops for a sustained period, cut costs early rather than draining the buffer entirely first. Early small cuts beat late large ones.

Common mistakes

• Spending according to what arrived this month — Good months feel like a surplus and lean months become a crisis. A fixed self-paid salary removes the volatility from your spending.
• Not setting tax aside immediately — Tax owed is not income. Spending it produces a bill that arrives when the money is gone, which is the most common self-employment difficulty.
• Budgeting against an average month — Averages hide the low points. Plan against the bad months and the good ones look after themselves.

Questions people ask