A 1099 at 80,000 owes 11,304 in self-employment tax before income tax is even computed
Published 2026-11-09 · updated 2026-11-09 · figures for tax year 2026
A 1099 pays the same two payroll taxes a W-2 does, plus the half the employer used to pay, minus a deduction for that half, minus a deduction for being self-employed. Four adjustments in a fixed order, and the order matters: do them in the wrong sequence and the number comes out high by exactly the deduction you forgot. $80,000 of self-employment income, walked through once.
The same gross, two structures
As an employee at $80,000 in California, FICA is $6,120 — 6.2% plus 1.5%, with an employer matching it invisibly. As a contractor on the same $80,000, self-employment tax is $11,304, which is the employee half and the employer half charged to the same person.
| Line | Amount | Why |
|---|---|---|
| Gross receipts | $80,000.00 | what the client paid |
| Self-employment tax base | $73,880.00 | 92.35% of gross |
| Self-employment tax | $11,303.64 | 12.4% Social Security + 2.9% Medicare |
| Half of SE tax, deducted | $5,651.82 | above the line |
| Adjusted gross income | $74,348.18 | gross minus the half |
| Standard deduction | $16,100.00 | |
| QBI deduction | $11,649.64 | 20% of qualified income |
| Taxable income | $46,598.54 | |
| Federal income tax | $5,343.83 | the bracket table |
Read the order: the $73,880.00 base is not the gross — 92.3% of it, the statutory approximation for the employer-half deduction. The resulting $11,303.64 of SE tax is then halved, and that half $5,651.82 comes off before the standard deduction, which is what puts AGI at $74,348.18 instead of $80,000.00.
Two deductions that look alike and are not
The half-SE deduction is above the line. It reduces AGI, so it also reduces the income that later deductions are measured against — it is worth more than its face amount.
QBI is below the line but computed from AGI. At this income the qualified business income deduction is $11,649.64 — 20% of the smaller of the business income and the taxable income after the standard deduction. It does not reduce self-employment tax, which is the point people miss when they assume "20% off" means 20% off everything.
The number to keep in a separate account
Total tax here is $16,647.47 against $80,000 of receipts — 20.8% to set aside. Split quarterly that is $4,161.87 per payment. None of it is withheld, so the entire discipline is manual: the money arrives whole and leaves in four instalments, and the only way the year ends cleanly is if the set-aside happened at the moment of receipt.
What this page deliberately leaves out
State income tax. The figures above stop at the federal layer, the same way California's payroll withholding does not apply to a contractor with no payroll. State tax on self-employment income is computed separately and stacks on top.
Business expenses. Every deductible expense reduces both income tax and self-employment tax, at roughly the combined marginal rate. At this income a dollar of legitimate expense is worth about $0.23 in tax, which is why the expense record matters more than the receipt pile.
Federal figures use the 2026 tables, single filing status, and the standard deduction. QBI is modelled at the full 20%; the limitation that applies to specified service businesses above the 32% bracket start is not modelled here.
Put a number on it
The same mechanisms on an actual salary. Every figure here is computed by the engine that serves the calculators, so it matches the page it opens — nothing is copied.