Your Side Hustle's Real Hourly Rate: Self-Employment Tax Halves It
2026-09-18
Short answer: Headline rate is gross income divided by billed hours. True rate divides what you keep by every hour the work consumes. On $9,000 gross, $1,200 of expenses, $1,102 of self-employment tax and $1,595 of income tax, $5,103 is left — and across 340 hours including unbilled admin that is $15.01 an hour, not the $30 the headline shows.
Two rates, and only one of them is real
The rate a side business advertises to its owner is gross income divided by billed hours. Every deduction between that number and the money in the account is invisible, and on self-employment income there are a lot of them.
true hourly = (gross − expenses − SE tax − income tax) ÷ (billed + unbilled hours)The arithmetic
Worked example — 9,000 of side income across 300 billed hours, with 1,200 of business expenses and 40 hours a year of quoting, invoicing and bookkeeping.
| Line | Amount |
|---|---|
| Gross income | $9,000 |
| Less business expenses | −$1,200 |
| Net profit | $7,800 |
| Less self-employment tax ($7,800 × 0.9235 × 0.153) | −$1,102 |
| Less income tax at 22% on $7,249 (profit less half the SE tax) | −$1,595 |
| Money kept | $5,103 |
| Denominator | Hours | Rate |
|---|---|---|
| Billed hours only | 300 | $30.00 headline |
| All hours the work consumes | 340 | $15.01 true |
The headline rate is exactly double the real one. Nothing unusual happened: the numbers are ordinary, and the halving is structural.
Where each dollar goes
Of the original $9,000:
- $1,200 to expenses — real costs of doing the work.
- $1,102 to self-employment tax — both halves of payroll tax, because you are both employer and employee.
- $1,595 to income tax.
- $5,103 kept.
The self-employment tax line is the one that surprises people, and it is the reason a 30 contract rate and a 30 employee rate are not the same job. An employee’s 7.65% is matched by the employer; a contractor pays 15.3% of 92.35% of profit alone.
The unbilled hours
Forty hours may sound generous for admin on a 300-hour year. For most side businesses it is optimistic. Quoting, chasing late payment, bookkeeping, buying supplies, travel between jobs, and the time spent finding the next client are all caused by the work and none of them are billed.
That time is pure denominator: it lowers the rate without lowering the tax. It is also the fastest lever most people have, because cutting ten unbilled hours raises the true rate more than a 3% price increase does.
What would reverse the conclusion
- Employee rather than contractor status. Work paid through payroll has half the payroll tax paid by someone else, which is worth roughly 7.65% of gross on its own.
- Genuine deductible expenses you are not claiming. Mileage at the current IRS rate, a home-office deduction where you qualify, equipment and software all reduce net profit and therefore both taxes. Unclaimed deductions are the most common unforced error here.
- A lower marginal rate. The 22% used here is an assumption. A household in a lower bracket keeps materially more, and above the Social Security wage base the 12.4% component drops away.
- Work that is not really hourly. If the side business builds an asset — an audience, a product, a reputation — the hourly rate understates it, because part of the return arrives later and is not in this year’s income at all.
Run your own numbers in the salary converter →