Four charts every freelancer should keep
Freelance finances go wrong in four predictable ways: one client becomes too much of your income, invoices quietly age, tax arrives as a surprise, and a good month hides a declining trend. One chart each.
1. Income by client
A sorted bar chart of the last twelve months by client. The moment one bar exceeds about 40% of the total, you do not have a business, you have a job with worse protection.
2. Invoice ageing
Bars for current, 30, 60 and 90-plus days outstanding. Nothing motivates chasing payment like watching a bar move into the 90-day bucket every month.
3. Tax set aside versus tax owed
Two bars per quarter: what you have put aside, and what you owe. The gap between them is the number that ruins Januaries, and it is much easier to close when it is visible in March.
4. Rolling twelve-month income
Monthly income is too noisy to read as a trend. A rolling twelve-month total smooths the seasonality and shows the only thing that matters: whether the line is rising or falling.
- Client concentration above 40% is a risk, not a success.
- Invoice ageing is a behaviour chart, not an accounting chart.
- Set tax aside monthly, chart it quarterly.
- Trend on a rolling twelve months, never on a single month.
Fifteen minutes at the start of each month is enough to keep all four current, which is a very cheap insurance policy.
Frequently asked
How much client concentration is too much?
As a rule of thumb, more than 40% of income from a single client is a risk worth actively managing, because losing them removes a rent payment rather than a project.
How much should a freelancer set aside for tax?
It depends entirely on your country and structure — check with an accountant. What matters for charting is that you set the percentage once and track the gap between reserved and owed every month.