Schedule SE is the IRS tax schedule filed with Form 1040 to calculate self-employment (SE) tax — the 15.3% levy (Social Security + Medicare) paid by sole proprietors, independent contractors, and single-member LLC owners on net self-employment income (irs.gov/forms-pubs/about-schedule-se-form-1040).
Schedule SE (Self-Employment Tax) is filed by anyone with net self-employment income of $400 or more in a calendar year. Self-employment tax replaces the FICA payroll taxes that employees and employers each pay; because self-employed individuals are both employee and employer, they pay the full 15.3% rate (12.4% Social Security + 2.9% Medicare) under IRC §1401. The calculation: Net SE earnings = Schedule C net profit (or partnership/LLC distributive share) × 0.9235 (this multiplier accounts for the deductible employer-equivalent half of SE tax). SE tax = net SE earnings × 12.4% up to the Social Security wage base ($168,600 for 2024; adjusted annually by SSA) + net SE earnings × 2.9% with no ceiling. The Additional Medicare Tax (0.9%) applies to SE income over $200,000 (single) / $250,000 (MFJ) but is computed on Form 8959 rather than Schedule SE. Two offsetting deductions: (1) You may deduct one-half of the SE tax from gross income (above the line) on Form 1040 Schedule 1 — reducing taxable income but not the SE tax base. (2) Self-employed health insurance premiums are deductible from income under IRC §162(l). Lenders treat SE tax as a cash expense (unlike depreciation), so it is not added back when calculating qualifying income. However, lenders do add back the one-half SE tax deduction to gross income in some underwriting models. Full instructions at irs.gov/pub/irs-pdf/i1040sse.pdf.
Anyone with net self-employment income of $400 or more — sole proprietors, independent contractors, single-member LLC owners, general partners in a partnership, and S-corp owners on earnings not paid as W-2 wages. S-corp owners pay FICA through their W-2 salary; their K-1 distributions are not subject to SE tax, which is a primary benefit of S-corp election (irs.gov/forms-pubs/about-schedule-se-form-1040).
No — they are separate. SE tax is the Social Security and Medicare levy on self-employment income (15.3%). Income tax is separately calculated on taxable income at ordinary rates (10%–37% federal). Both are reported on Form 1040 and paid through quarterly estimated tax payments. SE tax is owed even if your income is below the income tax filing threshold (irs.gov/pub/irs-pdf/i1040sse.pdf).
Yes — S-corp election is the primary strategy for reducing SE tax. An S-corp owner-employee pays W-2 wages (subject to FICA) and takes the remainder as distributions (not subject to SE tax). The IRS requires wages to be 'reasonable compensation' under IRC §162 — underpaying wages to avoid FICA triggers IRS audits. Consult a CPA before electing S-corp status.
SE tax is a real cash obligation — lenders do not add it back to income as they would depreciation. Some lenders add back the Schedule 1 deduction for one-half of SE tax to reconcile to gross self-employment income. Quarterly estimated payments of SE tax should be factored into cash flow analysis for business loan sizing (irs.gov/forms-pubs/about-schedule-se-form-1040).