The $400 rule is the IRS’s threshold for requiring self-employed people to file taxes. Have $400 or more in net profit from self-employment, and you must file and pay self-employment tax. This applies to freelancers, contractors, and anyone running a sole proprietor business.
Understanding the $400 Threshold
The IRS defines net self-employment income as your gross income minus business expenses. Once that number hits $400 in a calendar year, filing becomes mandatory.
Why $400? It’s somewhat arbitrary but rooted in practicality. At $400 in net profit, you owe roughly $60 in self-employment tax (the 15.3% rate). The IRS decided amounts below this weren’t worth their enforcement effort. It’s a mercy threshold.
Don’t misinterpret this as taxable-income free. If you earned $500 with $400 in net profit, that $400 is still taxable income. You’re required to report it on your return. The threshold is about filing obligation, not whether income is taxable.
The key calculation: Gross Income minus Business Expenses equals Net Profit. If Net Profit is at least $400, you must file.
How Self-Employment Tax Works
Self-employment tax is separate from federal income tax. It covers Social Security and Medicare contributions for the self-employed. The current rate is 15.3% (12.4% Social Security, 2.9% Medicare).
Because you’re both employer and employee, you pay both sides of these taxes. Regular employees have their employer match contributions. Freelancers cover both sides.
Example: Net profit of $5,000 means roughly $765 in self-employment tax. You also owe federal income tax on that $5,000 (the rate depends on your total income and filing status). Total might be $765 in self-employment tax plus $1,100 in federal income tax for $1,865 owed.
This is why tracking expenses matters. Every dollar you deduct reduces your net profit and your tax liability dollar for dollar.
The 1099 Form Override
Here’s an important exception to the $400 rule: if a client issued you a 1099 form, you must file regardless of net profit.
A 1099 is issued when a client pays you $600 or more in a calendar year. The client must file this form with the IRS and send you a copy. Once the IRS has a 1099 in your name, they expect a corresponding tax return.
Scenario: You earned $700 from one client (who issued a 1099) and $200 from another (who didn’t). Your gross is $900 with minimal expenses, so net profit is roughly $900. You exceed the $400 threshold. Even with $50 in net profit, you’d have to file because of the 1099.
The 1099 creates an enforcement mechanism. The IRS cross-references 1099s with filed returns and flags discrepancies. If someone reported paying you and you didn’t report it, that mismatch gets investigated.
State and Local Considerations
State rules sometimes differ from federal rules. Some have their own thresholds, possibly lower than $400.
California requires filing state income tax if you have any gross income, regardless of the $400 rule. Other states follow federal guidelines or tie thresholds to gross income rather than net profit.
Before relying on the $400 rule, check your state’s tax authority website. A freelancer in a state with lower thresholds might have to file even if net profit is below $400.
City and local taxes may also apply. Freelancers in cities like New York or San Francisco may have additional filing requirements or income taxes that override the $400 rule.
What Happens Below the Threshold
If you’re truly below $400 in net profit, you don’t have to file a federal self-employment tax return. This doesn’t mean your income is tax-free. It means you’re not obligated to file specifically for self-employment tax purposes.
If you have other income (wages from a job, interest, capital gains) that requires filing, then you must report your freelance income on that return, even if it’s under $400.
If you’re eligible for refundable tax credits (like the Earned Income Tax Credit), you might benefit from filing even though you’re below the threshold. These credits can result in refunds exceeding your tax liability.
Quarterly Estimated Taxes
The $400 rule determines annual filing obligations, but if you expect to owe $1,000 or more in total tax (federal and self-employment combined), you must pay estimated quarterly taxes throughout the year.
You can’t wait until April to pay. Make four quarterly payments on April 15, June 15, September 15, and January 15. Failure to do so results in penalties and interest, even if you eventually pay everything.
Many freelancers discover this obligation too late and end up with underpayment penalties. Use Form 1040-ES to calculate your quarterly estimate, or use tax software to model your expected year-end liability.
The $400 rule is the baseline for self-employment tax filing, but 1099 forms, state requirements, and estimated tax obligations can override it, making compliance more complex than just checking one threshold.
Related: How Much Do You Have to Make as a Freelancer to File Taxes?, Do Freelancers Have to Pay Tax? What You Actually Owe
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