What this line means
Half of the self-employment tax you calculated on Schedule SE. Self-employment tax is the self-employed equivalent of FICA (Social Security and Medicare) taxes that W-2 employees split with their employer. Because you pay both halves, the IRS lets you deduct the employer-equivalent half as an adjustment to income. This deduction reduces your AGI but does not reduce the amount of income subject to self-employment tax itself.
Does this apply to you?
- You have net self-employment earnings of $400 or more
- You filed Schedule SE to calculate self-employment tax
- You reported business income on Schedule C, farm income on Schedule F, or other self-employment income
Easy to overlook
This deduction is available to every self-employed person Every sole proprietor, freelancer, independent contractor, and farmer who owes self-employment tax gets this deduction. 1 It is not optional and does not require itemizing. If your net Schedule C profit is $60,000, your SE tax is roughly $8,478, and your line 15 deduction is roughly $4,239. First-time self-employed filers who focus on Schedule C sometimes skip Schedule SE entirely and miss both the tax and the corresponding deduction. General filing pattern — SE tax deduction missed by first-time self-employed
The deduction reduces AGI, which affects other tax benefits Because this is an above-the-line deduction, it lowers your adjusted gross income. 2 A lower AGI can increase eligibility for the IRA deduction, student loan interest deduction, child tax credit, and other income-based benefits. Self-employed filers who skip this deduction pay more income tax and lose credits they would otherwise qualify for. IRS Schedule SE Instructions — Self-Employment Tax
Watch out for this
Deducting the full self-employment tax instead of half. Line 15 is only the deductible part — 50% of the total SE tax from Schedule SE. If your total SE tax is $10,000, you deduct $5,000 here, not $10,000. Entering the full amount doubles the deduction and understates your AGI.
Footnotes
-
IRS Schedule SE (Form 1040) Instructions, Deduction for One-Half of SE Tax. https://www.irs.gov/instructions/i1040sse ↩
-
IRS Schedule SE (Form 1040) Instructions, Who Must Pay Self-Employment Tax. https://www.irs.gov/instructions/i1040sse ↩