Minor Side Income: Self-Employment Tax

Even modest side income creates self-employment tax and opens planning opportunities. This guide addresses optimal structures for supplemental business income.

You still must report it. Side income goes on Schedule C regardless of the amount. There is no minimum threshold for reporting self-employment income, and any payer issuing you $600 or more files a 1099-NEC with the IRS. Even amounts below $600 are legally reportable income.

Entity formation probably does not make sense yet. The tax savings from an S-corp election require enough net profit to justify the compliance costs -- payroll filings, a separate return, registered agent fees. Below roughly $30,000 to $40,000 in annual net profit, the math rarely works. A sole proprietorship on Schedule C is simpler and cheaper.

Watch the hobby loss rules. If your side activity shows losses for three out of five consecutive years, the IRS may reclassify it as a hobby under IRC Section 183. Hobby expenses are not deductible, but the income remains taxable. Keep records showing profit intent: a separate bank account, business plan, and documented efforts to improve profitability.

The pitfall: Ignoring minor 1099 income is the most common audit trigger for high earners. The IRS matches 1099-NEC filings against your return automatically, and the mismatch notice is not a gentle reminder.