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What Is the $400 Rule for Self-Employed People?
TaxClutch Team2 min read
The $400 rule trips up almost every new freelancer. It's the trigger that turns 'I made a little money on the side' into 'I have to file a tax return and pay self-employment tax.' Here is what the rule actually says, why it catches people off guard, and what to do about it.
The $400 Filing Threshold
If your net self-employment income is $400 or more in a year, you are required to file a federal tax return — even if you'd otherwise be below the standard filing threshold for W-2 employees. This is because self-employment tax is calculated separately, and the IRS wants its 15.3% on every dollar above $400.
What Net Self-Employment Income Means
Net self-employment income is your gross freelance revenue minus your business deductions. So if you earned $5,000 and had $4,800 in deductions, your net is $200 — under the threshold. But if your net is $401, you have to file.
Why This Catches New Freelancers Off Guard
Most W-2 workers know they don't have to file if they earn under the standard deduction (~$14,600 single in 2024). They assume the same rule applies to side gigs. It does not. A few hundred dollars of freelance income can legally require you to file a return.
Side hustlers learn the $400 rule the hard way — usually after the IRS sends a letter assessing tax plus penalty plus interest two years later.
What Happens If You Do Not File
Failure to file triggers two penalties: failure-to-file (5% of the tax due per month, up to 25%) and failure-to-pay (0.5% per month). On top of that, interest compounds. A $1,500 self-employment tax bill ignored for two years can balloon to $2,500+ once penalties land.
How to Track Net Income Throughout the Year
- Log every payment as it comes in — don't batch at year-end.
- Log every business expense the same way (receipts, software, mileage).
- Watch the running net total: gross minus expenses.
- Cross the $400 line and you're filing — start planning for it.
How TaxClutch Keeps You on the Right Side
TaxClutch shows your net self-employment income in real time. The moment you cross $400, your dashboard recalculates your full tax picture — federal, SE tax, state — so you know what's coming and can set aside the right amount before April.
Frequently Asked Questions
Does the $400 rule apply to gross or net income?
Net. Subtract your legitimate business deductions from gross income. If the result is $400 or more, you have to file.
What if I made $400 in side income but I'm a full-time W-2 employee?
You still have to file (you'd file anyway with W-2 income), but more importantly you have to add the side income to Schedule C and pay self-employment tax on it.
What if my net income is exactly $399?
Below the threshold — no filing requirement triggered by SE tax. But other thresholds (like W-2 income, dividends, etc.) may still require you to file.
Do hobby earnings count under the $400 rule?
Hobby income is taxable but not subject to self-employment tax — and the $400 rule specifically applies to SE tax. The IRS distinguishes hobbies from businesses based on intent to profit and ongoing activity.
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