Self-Employment Tax (SECA) Explained
Why self-employed workers pay double the payroll tax of W-2 employees, and the deductible-half offset that softens it.
The short answer
Self-employed workers pay 15.3% self-employment tax (12.4% Social Security + 2.9% Medicare) on net earnings, both halves of the payroll tax a W-2 employee splits with an employer. The Social Security portion stops at the $184,500 wage base, and half of the tax is deductible against income tax.
2026 tax year. Above the wage base, only the 2.9% Medicare portion continues (3.8% over the additional-Medicare threshold).
The US Social Security and Medicare programs are funded by payroll tax, called FICA when paid on wages and SECA when paid on self-employment income. Total rate is the same, but the split is dramatically different. A salaried employee splits the bill with an employer; a self-employed worker pays both halves alone. That is the source of nearly every “why is my freelance tax bill so big?” surprise, and the reason new contractors so often underestimate their first year's liability by tens of thousands of dollars.
The Setup: Two Payroll Tax Regimes
Two parallel payroll-tax systems, structurally identical in total rate but drastically different in who actually writes the check:
- Employee under FICA: 7.65% withheld from your paycheck (6.2% Social Security + 1.45% Medicare). Your employer pays the matching 7.65% directly to the IRS, invisible to you, but a real labor cost.
- Self-employed under SECA: the full combined rate (12.4% Social Security + 2.9% Medicare) on your net self-employment income, you pay both halves yourself.
A genuine doubling of the payroll tax burden, not a different system. A salaried worker earning $80,000 has $6,120 of FICA withheld; an $80,000 net-self-employed worker owes $11,304 of SECA. That gap of $5,184 lands as a single line on Schedule SE and gets paid in full at filing time (or ideally pre-paid via quarterly estimates).
The 2026 Numbers
Each parameter is set or indexed by the SSA and IRS for the relevant tax year. For 2026:
| Component | Rate | Income Cap | Notes |
|---|---|---|---|
| Social Security (OASDI) | 12.4% | $184,500 | 2026 SSA wage base; both halves of payroll tax |
| Medicare (HI) | 2.9% | None | Applies to all net SE income |
| Additional Medicare | 0.9% | - | Above $200K single / $250K joint wages + SE |
| Combined SECA | 15.3% | $184,500 | Drops to 2.9% above wage base |
Above the Social Security wage base, the rate drops to just 2.9% Medicare (or 3.8% with Additional Medicare). This step-down is why high-income consultants and lawyers see their average payroll-tax rate fall noticeably as their income climbs above the wage base, though the regular federal income tax keeps rising via marginal brackets.
The 92.35% Reduction
SECA is computed on 92.35% of net SE earnings, not 100%. This is a small built-in offset: the IRS calls it the equivalent of the employer-side FICA deductibility that W-2 workers already get implicitly through their employer's contribution.
So a sole proprietor with fifty thousand of net Schedule C income pays SECA on a base of $46,175 (which is the net income times the 0.9235 reduction factor), not the full earnings. Worked: $46,175 multiplied by the combined SECA rate equals $7,065 owed. The reduction effectively shaves the headline SECA rate down to about 14.13% on full net earnings.
The Deductible Half (Above-the-Line Deduction)
You get to deduct half of your SECA as an above-the-line adjustment on Form 1040 Schedule 1. This shrinks your federal income tax base, it does not reduce the SECA itself.
In the example above, $7,065 / 2 = $3,532 reduces the federal taxable income that the regular income-tax bracket schedule applies to. At a 12% marginal bracket, that translates to about $424 of federal income tax savings. At a 22% bracket, it would be $777. At a 32% bracket, $1,130.
Worked Example: Fifty-Thousand Schedule C Single Filer
A freelance writer or solo consultant netting fifty thousand in 2026, single, no other deductions:
| Step | Detail | Amount |
|---|---|---|
| Net Schedule C income | Gross receipts minus business expenses | $50,000 |
| SECA base | 92.35% of net | $46,175 |
| SECA owed | Base times combined rate | $7,065 |
| Half-SECA deduction (above-the-line) | SECA owed divided by two | $3,532 |
| Federal AGI | Net income minus the half-SECA deduction | $46,468 |
| Standard deduction (2026 single) | - | $16,100 |
| Federal taxable income | AGI minus standard deduction | $30,368 |
| Federal income tax | First-bracket plus ($17,968 at second-tier rate) | $3,396 |
| Total federal liability | $10,461 | |
The eye-opener for first-year freelancers: that fifty-thousand of net income produces about $10,461 of federal liability, over 20% effective. A W-2 worker grossing the same amount would have only about $3,825 of FICA withheld plus comparable income tax, but the FICA appears as a paycheck deduction throughout the year rather than a single April surprise.
Why People Get Surprised by SECA
Two recurring patterns that show up every spring on freelancer forums:
- “I made $80K freelance and owe nearly $19K, but I thought I was in the 12% bracket!” Federal income tax on $80K of net self-employment income (single, standard deduction, after the half-SECA adjustment) is roughly $7,500. SECA on $80K nets out around $11,300. Total federal: about $18,800. The shock comes from forgetting SECA exists, most W-2 employees never see the employer-side payroll tax because the employer cuts that check directly to the IRS.
- “I should incorporate to escape SECA.” An S-corp can split your earnings into “reasonable salary” (subject to FICA) and “distributions” (not subject to FICA). The IRS scrutinizes the salary portion, it must be reasonable for your role, location, and skill level. Savings are real but smaller than people imagine, and the administrative cost of running an S-corp (separate tax return, payroll service, state fees) often eats most of the gain below about $60,000 of SE income.
The Quarterly Estimated Payment Trap
Because no employer withholds SECA on your behalf, you owe it directly to the IRS. Most self-employed workers must make quarterly estimated tax payments via Form 1040-ES on April 15, June 15, September 15, and January 15.
Underpayment of estimated tax can trigger a Form 2210 penalty even if you pay in full at filing time. The “safe harbor” rule shields you from this penalty if your quarterly payments total at least 100% of the prior year's tax liability, or 110% if your prior-year AGI exceeded $150,000. So a freelancer with a strong year following a weak year can prepay safely on the modest prior-year baseline, then settle up at filing.
Side Hustles: When SECA Kicks In
SECA applies when net SE earnings exceed $400 in a year. Below that threshold, no SECA is owed (though the income still counts for federal income tax). This trips up gig workers who treat small side income as “hobby” income, the IRS classifies anything done with a profit motive as self-employment, not a hobby, and the threshold for SECA filing is intentionally low.
Two important nuances for gig workers:
- 1099-K reporting threshold for third-party payment platforms (Venmo, PayPal, Stripe) is being phased to $600 over 2026-2027. Receiving a 1099-K does not automatically make income taxable, but it does make the IRS aware of the payment volume.
- Rideshare and delivery drivers get a Schedule C deduction for vehicle mileage at the standard 70 cents per mile rate (2026 rate per IRS Notice 2025-XX), often dramatically reducing net SE income relative to gross.
FAQ
If my freelance side gig nets only $5,000, do I really owe both income tax and SECA on it?
Yes. Federal income tax applies on top of any other income at your marginal bracket, and SECA applies at the combined rate on 92.35% of the side income (about $706 SECA on a five-thousand-dollar side gig). On that scale, expect roughly $1,500-$2,500 of total federal liability depending on your day-job income.
Does an S-corp election eliminate SECA entirely?
No. The salary portion of an S-corp owner's compensation is still subject to FICA (the W-2 equivalent of SECA). Only the distribution portion escapes payroll tax. The IRS requires a “reasonable salary” - so you cannot legally pay yourself $1 in salary and $200,000 in distributions to dodge all payroll tax.
Do I get Social Security credits for SECA paid?
Yes. SECA pays into the same Social Security and Medicare trust funds as FICA. Your Social Security earnings record (visible on ssa.gov) shows credits earned through both. The 2026 quarter-of-coverage threshold is $1,810, earn at least $7,240 of net SE income in a year and you get the maximum 4 quarters of credit.
What deductions reduce SECA itself, not just income tax?
Business expenses (Schedule C ordinary and necessary) reduce net SE income directly, which reduces both SECA and income tax. The half-SECA deduction reduces income tax only, not SECA. Most retirement contributions (SEP-IRA, solo 401(k)) reduce income tax but not SECA. Self-employed health insurance reduces income tax but not SECA. The only way to reduce SECA itself is to reduce net business income through legitimate business deductions.
Sources
- SSA Fact Sheet 2026, wage base, Medicare rates, additional Medicare threshold
- IRS Publication 334 - Tax Guide for Small Business (2025 ed., the 2026 ed. publishes Q1 2026)
- IRS Form 1040 Schedule SE, Self-Employment Tax
- IRC §1401-1403, Self-Employment Contributions Act