Budgeting on Irregular Income
Turn a variable income into a fixed one by putting a buffer account in between.
At a glance
Figures checked 1 Sep 2026
What to take away
- Pay yourself a fixed monthly amount from a buffer account.
- Set the salary near your lowest-quartile month, not your average.
- Set tax money aside on receipt — 25–30% of gross is a common starting point.
The problem with variable income is not the total. It is that expenses are fixed while income is not, so a good month funds lifestyle inflation and a bad month funds credit card debt.
The buffer account structure
- All income lands in a business or holding account.
- Immediately move 25–30% to a separate tax account. Never touch it.
- Transfer a fixed “salary” to personal checking on the same date each month.
- Surplus stays in the buffer and accumulates through good months.
- Once the buffer holds six months of salary, raise the salary.
Set the salary from your lower-income months, not your average. A salary set at the average empties the buffer in the first slow quarter.
Estimated taxes
Self-employment income generally requires quarterly estimated payments covering both income tax and self-employment tax. The separate tax account is what makes those dates uneventful.
Common questions
Six months of your chosen salary is a comfortable target; three is a workable start.
A solo 401(k) or SEP IRA lets you contribute in strong years without committing to a fixed monthly amount.