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Self-Employment Tax Calculator
Estimate Schedule SE tax — Social Security, Medicare, and additional Medicare — net of the half-of-SE-tax income adjustment.
Your situation
Self-employment tax (Schedule SE) on net business profit, including additional Medicare tax above the threshold.
W-2 wages already paid Social Security up to the wage base; that reduces the OASDI portion of SE tax owed.
Estimated SE tax
$14,130
owed on Schedule SE in addition to regular income tax
Read this carefully
SE tax is separate from federal income tax. Half the SE tax (OASDI + Medicare; not the additional Medicare) is deductible against AGI. State tax is not modeled. Talk to a partner.
Estimates for educational purposes only — not tax, legal, or accounting advice. Your specific facts will change the result; confirm with a CPA before acting.When SE tax becomes a serious bill
Once net SE earnings clear $80–100K above a reasonable salary, the S-corp election starts to save real money on payroll tax — at the cost of running payroll, filing a separate return, and (in California) the 1.5% S-corp tax.
Keep reading
1099-NEC
IRS form used to report payments to non-employee contractors and freelancers.
GlossarySelf-Employment Tax
Combined Social Security + Medicare tax (15.3%) owed by self-employed individuals on net earnings.
GlossarySchedule SE (Self-Employment Tax)
The IRS form computing self-employment tax (Social Security + Medicare) for sole proprietors, partners, and LLC members.
GuideQuarterly Estimated Tax for Self-Employed and Business Owners
If you're not on a W-2, the IRS expects four prepayments a year. Miss them and you owe penalties even if you pay in full at filing.
GuideCalifornia Small Business Franchise Tax Explained
The minimum $800 every California entity owes — and the layered taxes that surprise founders who form here without thinking it through.
GuideContractor (1099) vs. Employee (W-2): The IRS Test
Misclassifying employees as contractors is one of the most common — and most expensive — small business mistakes. Here's how the IRS decides.