How much self-employment tax will I owe on $80,000?

Self-employment tax is 15.3% of 92.35% of your net income. On $80,000 the SE base is $73,880, giving $9,161 of Social Security tax plus $2,143 of Medicare tax, about $11,304 total. Half of that is deductible against income tax.

How much is each quarterly payment?

The required annual amount is divided by four. In the example, a single filer with $80,000 of net self-employment income and a $12,000 prior-year tax owes about $3,000 per quarter under the safe harbor.

When are estimated tax payments due?

Federal estimated payments for a calendar-year filer are generally due April 15, June 15, September 15, and January 15 of the following year. Pay online through IRS Direct Pay or the Electronic Federal Tax Payment System.

Estimated Quarterly Tax Calculator

Q: What is the safe-harbor rule?

You avoid an underpayment penalty by paying the smaller of 90% of this year's tax or 100% of last year's tax (110% if last year's AGI was above $150,000). With $12,000 of prior-year tax and AGI under $150,000, the safe harbor is $12,000.

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If you earn self-employment or 1099 income with no withholding, the IRS expects quarterly estimated payments. This calculator combines your 15.3% self-employment tax with 2026 federal income tax, applies the safe-harbor rule, and splits the required amount into four equal payments.

How it works

Self-employment tax is computed on 92.35% of your net income, then split into Social Security (capped) and Medicare (uncapped) portions:

SE base   = netSE * 0.9235
SS tax    = min(SE base, 176,100) * 0.124
Medicare  = SE base * 0.029
SE tax    = SS tax + Medicare

Half the SE tax is deductible. Income tax then applies to net income minus that half and minus the standard deduction (15,750 single / 31,500 joint) using the 2026 brackets. The safe harbor is the smaller of 90% of this year’s total tax or 100% of last year’s tax — 110% if last year’s AGI was above 150,000 dollars. Divide by four for each quarterly payment.

Example

A single filer expects 80,000 dollars of net self-employment income, paid 12,000 dollars in tax last year, and had a prior AGI of 75,000 dollars:

SE tax        = 9,161 + 2,143 = 11,304   (half deductible = 5,652)
taxable       = 80,000 − 5,652 − 15,750 = 58,598
income tax    ≈ 7,806
total         ≈ 19,109
safe harbor   = min(90% of 19,109 = 17,198, 100% of 12,000) = 12,000
quarterly     = 12,000 / 4 = 3,000

So this filer pays about 3,000 dollars per quarter.

Notes

Estimate only, not tax advice. The Social Security portion is capped at the 176,100 dollar wage base while Medicare is uncapped, combining to 15.3% on most income. The tool excludes state estimated tax, the 0.9% additional Medicare tax on high earners, and the qualified business income (QBI) deduction, all of which can change your number. See Form 1040-ES at irs.gov.