How do you budget with an irregular income?

Budget on your lowest recent month, pay yourself that amount on a fixed date from a holding account, and let better months build a buffer in the holding account.

How big should the buffer be?

Aim for two months of your baseline salary in the holding account, then build a separate emergency fund of three to six months of essential outgoings.

How much should a self-employed person set aside for tax?

A fixed share of every payment, commonly 20 to 30 percent, adjusted once you know your actual bill. Keep it in a separate pot.

How to budget on a variable income

By The Income Tracker · Updated 8 September 2026 · 5 min read

The short answer

Budget on your lowest recent month, not your average. Pay yourself a fixed amount from a buffer account on the same day each month, and let the good months fill the buffer. If you are self-employed, skim a fixed share of every payment into a tax pot before it touches anything else.

Find the baseline

Export the last six months from your bank and import them into The Income Tracker.
Read the income figure for each month. The lowest one is your baseline. Not the average; averages hide the bad months.
Build the monthly budget on the baseline. If it covers the essentials, the method works. If it does not, the problem is the essentials, and that needs a separate look.

Pay yourself a salary

Send everything you earn into one holding account (a separate current account or a savings account with easy access). On a fixed date each month, transfer the baseline amount to the account you spend from. That transfer is your salary. In a good month the holding account grows; in a thin month it carries you. After a few good months you will have a buffer of one or two months' salary, and the anxiety mostly goes.

If you are self-employed, add the tax pot

Before any money reaches the holding account, move a fixed share of each payment into a tax pot. Many sole traders use 20 to 30 percent, adjusting once they know their actual bill. Log the transfer as "Set aside for tax" so it never looks spendable. The self-employed guide covers the deadlines and the digital record rules that start applying from April 2026.

What to do with the good months

First, fill the buffer to two months of the baseline.
Then the emergency fund, three to six months of essential outgoings.
Then raise the salary, cautiously. A pay rise you give yourself is easy to cut if the work dips.

Track the range, not just the number

The month-by-month view is the whole point for irregular earners. Twelve months side by side show the seasonality (quiet January, busy autumn) that a single monthly total hides. Once you can see the pattern you can plan for it rather than being surprised by it every year.

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Frequently asked questions

How do you budget with an irregular income?: Budget on your lowest recent month, pay yourself that amount on a fixed date from a holding account, and let better months build a buffer in the holding account.
How big should the buffer be?: Aim for two months of your baseline salary in the holding account, then build a separate emergency fund of three to six months of essential outgoings.
How much should a self-employed person set aside for tax?: A fixed share of every payment, commonly 20 to 30 percent, adjusted once you know your actual bill. Keep it in a separate pot.

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