PiggySide hustle under $400: the SE tax threshold
Net profit under $400 usually means no self-employment tax — not “the IRS ignores this income.”
What the $400 rule is
Self-employment tax generally kicks in when your net earnings from self-employment reach $400 for the year. Net means after ordinary business expenses — not gross deposits. Below that line, Schedule SE often shows no SE tax due; above it, the 15.3% stack (on 92.35% of profit) applies.
What it is not
- Not a free pass on income tax if you have taxable income overall.
- Not permission to skip bookkeeping.
- Not the same as 1099 reporting thresholds (those are about forms payers issue).
Quick examples
| Gross side income | Expenses | Net | SE tax? |
|---|---|---|---|
| $900 | $550 | $350 | Usually no |
| $900 | $400 | $500 | Yes — on the net |
| $2,000 | $200 | $1,800 | Yes |
Illustrative only. Run exact figures in the SE tax calculator.
When to start quarterly habits
Even under $400 SE tax, build the habit of separating cash and tracking mileage or fees. Once a side hustle grows, estimated-tax rules ($1,000+ expected balance due) arrive quickly — see first-year freelance taxes.
Run your own numbers
- Self-Employment Tax Calculator — the 15.3%, exactly.
- Quarterly Tax Calculator — what to send the IRS each quarter.
- Tax Set-Aside Calculator — what percent of profit to park.
- Quarterly Tax Deadlines — every due date + calendar file.
Frequently asked questions
Is income under $400 tax-free?
No. Income tax can still apply. The $400 figure is the usual threshold for owing self-employment tax, not a free pass on all taxes.
Do I need a Schedule C below $400 net profit?
If you have a business or side hustle, you generally still report the income and expenses. SE tax may be zero below the threshold, but records still matter.
What if I cross $400 in December?
SE tax can apply for the whole year’s net profit once you cross the threshold. Start a set-aside early so a late spike is not a surprise.