How to budget with irregular income: the plan-on method
Budgeting with irregular income works when you stop planning on the average month and start planning on a conservative one. Measure your last twelve complete months, take a figure that only one month in four falls below, and size fixed commitments to it. Good months then build buffer instead of lifestyle.
Why the average lies
An average is pulled up by your best months. Commit rent and subscriptions to it and every ordinary month feels like a shortfall. The median describes a typical month better, and a lower percentile describes the months you have to survive.
The plan-on method
- List income for the last twelve complete months. Include zero-income months; they are real.
- Find the median: the typical month.
- Find the 25th percentile: the plan-on figure. One month in four lands below it.
- Size fixed bills, savings, and debt payments to the plan-on figure.
- Treat everything above it in a good month as buffer first and spending second.
| Measurement | Example |
|---|---|
| Typical month (median) | $7,295 |
| Plan on (25th percentile) | $6,657 |
| Range | $5,200 to $8,440 |
| Variability | Steady, about ±13% |
| Measured monthly spending | $4,465 |
| Verdict | A low month clears spending with $2,192 to spare |
How much buffer is enough
If the plan-on figure covers your measured spending, your buffer is for surprises and can be a normal emergency fund. If it does not, the gap times the number of low months you expect in a year is the buffer you need before the next slow patch, and it should be funded from good months before anything discretionary.
Smooth the timing, not just the amount
Many freelancers pay themselves a fixed monthly salary from a holding account that receives client payments. The plan-on figure is the right salary: predictable, conservative, and refilled by good months. It turns irregular income into a regular one at the point where it meets your bills.
How Worth Clarity does it
The income smoothing card measures your last twelve complete months into a typical month, a plan-on figure, the range, and a variability chip, then says whether a low month clears your measured spending or how much buffer the gap needs. Pending payouts and deals join the 90-day forecast so money on the way is visible without being counted as cash.
Common questions
- How many months of data do I need?
- Three complete months give a first read; twelve give a trustworthy one because they include a full cycle of quiet and busy seasons. Worth Clarity starts measuring at three and improves as history grows.
- Should I count invoices when sent or when paid?
- When paid. Cash flow is about when money can be spent. Track what is owed separately so the forecast can include it with a date without treating it as cash.
- What about taxes on irregular income?
- Set aside a fixed percentage of every payment as it arrives into a tax reserve, and treat the reserve as not spendable. A yearly or quarterly tax bill then behaves like any other sinking fund.
