The problem is variance, not amount
Self-employment, commission, shift work, seasonal work and gig work all share a shape: the annual figure may be fine while any individual month is not. Ordinary budgeting advice assumes a predictable monthly figure and quietly fails without one.
The work is to convert an unpredictable inflow into a predictable one, and to be honest about the gap in between.
Average from the low months
Take twelve months of income if you have it. Most people then average it. It is more useful to look at the lowest three months, because those are the months a plan has to survive.
A plan built on the average is a plan that works most of the time. A plan built on the low months works always, and produces a surplus in the good ones — which is a much better problem.
Pay yourself on a schedule
Income arrives in the account it arrives in. From there, a fixed amount moves to the account you actually live from, on the same date each month, whatever came in.
This single habit does most of the work: it turns variable income into a fixed salary, and it makes the buffer visible as the thing absorbing the variance.
A buffer is not a reserve
These are two different pots doing two different jobs, and combining them means the emergency money quietly funds a slow month.
- The buffer smooths known variance — it covers the difference between a low month and your salary, and it is meant to be used regularly.
- The reserve absorbs shocks — it is untouched in an ordinary bad month.
- If you are self-employed, a third pot for tax is usually held separately again, because that money was never yours.
Setting aside for tax
Self-employed income generally arrives without tax withheld, and the obligation accumulates whether or not it is set aside. The practical habit is to move a percentage of every payment received into a separate account on the day it arrives.
The right percentage depends on your jurisdiction, your structure, your allowable expenses and your total income, and it is a calculation a qualified tax professional performs. No general article can supply that figure, and one that offered a number would be guessing about your circumstances.
This is general education, not advice about your situation. It does not decide anything about your credit, taxes, borrowing or legal position — those belong to you and to the qualified professionals you work with.