1099 Tax Calculator — Self-Employment Tax & Quarterly Payments

Estimate self-employment tax, federal income tax, and quarterly payments on 1099 income for 2026 — includes the SS wage base cap and Additional Medicare Tax.

July 4, 2026

Net Self-Employment Income ($)

Filing Status

Suggested Quarterly Payment

$3,247.27

$12,989.07 total estimated tax ÷ 4 — effective rate ≈ 21.6% of net profit

Self-Employment Tax

$8,477.73

SS $6,870.84 + Medicare $1,606.89

Federal Income Tax (est.)

$4,511.34

On $39,661 taxable income (after standard deduction + half-SE-tax deduction)

Total Estimated Tax Liability

$12,989.07

Set aside roughly 21.6% of every dollar of net profit — SE tax plus federal income tax combined.

SE tax = (Net Profit × 92.35%) × 15.3% (12.4% Social Security up to the $184,500 2026 wage base + 2.9% uncapped Medicare), plus 0.9% Additional Medicare Tax on self-employment income above $200,000 (single/HoH) or $250,000 (MFJ). Federal income tax uses 2026 brackets and the standard deduction only — no itemizing, credits, or other income sources are modeled. This is an estimate for planning quarterly estimated payments, not tax advice — it does not account for state income tax, self-employed health insurance or retirement plan deductions, the Qualified Business Income (QBI) deduction, or any other income you may have. Consult a tax professional or IRS Form 1040-ES for your exact filing obligations.

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Reference Values

Last verified: Jul 4, 2026

Category	Range	What It Means	Status
Self-Employment Tax Rate	15.3%	12.4% Social Security + 2.9% Medicare, applied to 92.35% of net self-employment profit — not the full profit amount.	Good
Social Security Portion	12.4%	Applies only up to the annual Social Security wage base. Above that cap, this portion stops — only the Medicare portion continues.	Good
Medicare Portion	2.9%	Uncapped — applies to all self-employment earnings regardless of amount, unlike the Social Security portion.	Good
2026 Social Security Wage Base ★	$184,500	Up from $176,100 in 2025 (SSA announced Oct 24, 2025). The 12.4% Social Security portion of SE tax applies only to earnings up to this cap.	★ Best
Additional Medicare Tax	+0.9%	Extra Medicare surtax on earned income above $200,000 (Single/Head of Household) or $250,000 (Married Filing Jointly) — no employer match exists for the self-employed.	Okay
Half-SE-Tax Deduction	50% of 15.3% portion	One-half of the 12.4%+2.9% self-employment tax is deductible from gross income when figuring income tax (the Additional Medicare Tax's 0.9% is not eligible for this deduction).	Good
2026 Standard Deduction — Single	$16,100	Used in this calculator's simplified income tax estimate (no itemizing modeled).	Good
2026 Standard Deduction — Married Filing Jointly	$32,200	Used in this calculator's simplified income tax estimate (no itemizing modeled).	Good
2026 Standard Deduction — Head of Household	$24,150	Used in this calculator's simplified income tax estimate (no itemizing modeled).	Good

Source: SSA 2026 contribution and benefit base announcement (Oct 24, 2025, $184,500 wage base, up from $176,100 in 2025), corroborated by Payroll.org and Thomson Reuters reporting on the same SSA release; IRS Rev. Proc. 2025-32 (2026 federal standard deduction amounts); IRS Schedule SE / Topic No. 554 (self-employment tax rate, 92.35% net earnings factor, half-SE-tax deduction rule); IRS Form 8959 instructions (Additional Medicare Tax thresholds and the exclusion of the 0.9% Additional Medicare Tax from the half-SE-tax deduction).

Worked Examples

Freelancer, $60,000 Net Profit (Single)

Net Profit: $60,000
Filing Status: Single

$12,989.07 total tax ($3,247.27/quarter)

SE tax base = $60,000 × 0.9235 = $55,410. SE tax = ($55,410 × 12.4%) + ($55,410 × 2.9%) = $6,870.84 + $1,606.89 = $8,477.73. Half of that ($4,238.87) plus the $16,100 standard deduction reduces taxable income to $39,661.14, giving an estimated federal income tax of $4,511.34. Total: $12,989.07.

Consultant, $120,000 Net Profit (Single)

Net Profit: $120,000
Filing Status: Single

$32,660.36 total tax ($8,165.09/quarter)

SE tax base = $120,000 × 0.9235 = $110,820, still under the $184,500 Social Security wage base so the full 12.4% applies. SE tax = $16,955.46. Federal income tax on the resulting $95,422.27 taxable income = $15,704.90. Total: $32,660.36.

High-Earning Contractor, $250,000 Net Profit (Single)

Net Profit: $250,000
Filing Status: Single

$76,423.51 total tax ($19,105.88/quarter)

SE tax base = $230,875, which exceeds the $184,500 Social Security wage base — the 12.4% portion caps at $22,878, while the uncapped 2.9% Medicare portion applies to the full $230,875 ($6,695.38), plus the 0.9% Additional Medicare Tax on the $30,875 over the $200,000 single-filer threshold ($277.88). SE tax totals $29,851.25. Federal income tax on the resulting $219,113.31 taxable income (only half the 15.3% SE tax portion is deductible, not the Additional Medicare Tax) = $46,572.26. Total: $76,423.51.

Married Small Business Owner, $90,000 Net Profit (MFJ)

Net Profit: $90,000
Filing Status: Married Filing Jointly

$18,393.60 total tax ($4,598.40/quarter)

SE tax base = $83,115. SE tax = $10,306.26 + $2,410.34 = $12,716.60. With the $32,200 MFJ standard deduction and half-SE-tax deduction, taxable income is $51,441.70, giving federal income tax of $5,677.00. Total: $18,393.60.

Gross Revenue Minus Expenses, Head of Household

Gross Revenue: $150,000
Business Expenses: $40,000
Net Profit: $110,000 (calculated)
Filing Status: Head of Household

$25,620.83 total tax ($6,405.21/quarter)

Net profit = $150,000 − $40,000 = $110,000. SE tax base = $101,585, giving SE tax of $15,542.51. With the $24,150 HoH standard deduction and half-SE-tax deduction, taxable income is $78,078.75, giving federal income tax of $10,078.33. Total: $25,620.83.

How to Use This Calculator

1

Choose how to enter your income

Enter your net self-employment income directly, or switch to "Gross Revenue − Expenses" mode to let the calculator subtract your business expenses for you.
2

Select your filing status

Single, Married Filing Jointly, or Head of Household — this affects both your standard deduction and the Additional Medicare Tax threshold.
3

Review your self-employment tax and income tax estimate

The calculator shows the SE tax breakdown (Social Security + Medicare + Additional Medicare if applicable) and an estimated federal income tax on your remaining taxable income.
4

Use the suggested quarterly payment

Total estimated tax divided by four gives a starting point for your Form 1040-ES quarterly estimated payments — adjust as your income changes through the year.

What Each Value Means

Self-Employment (SE) Tax ($): 15.3% tax (12.4% Social Security + 2.9% Medicare) on 92.35% of net self-employment profit, replacing the FICA tax that would otherwise be split between an employer and a W-2 employee. The 12.4% portion is capped at the annual Social Security wage base ($184,500 for 2026); the 2.9% Medicare portion is uncapped.
Additional Medicare Tax ($): An extra 0.9% Medicare surtax on self-employment income above $200,000 (Single/Head of Household) or $250,000 (Married Filing Jointly), with no employer-equivalent match available to offset it.
Estimated Federal Income Tax ($): Calculated using 2026 IRS progressive brackets on taxable income equal to net profit minus the standard deduction and minus one-half of the deductible portion of self-employment tax. Does not model itemized deductions, tax credits, or the Qualified Business Income (QBI) deduction.
Suggested Quarterly Payment ($): Total estimated tax liability (SE tax + federal income tax) divided by four, as a starting reference for IRS Form 1040-ES quarterly estimated payments.

Frequently Asked Questions

How much should I set aside from my 1099 income for taxes?

A common rule of thumb is 25–30% of your net self-employment profit, but the accurate number depends on your income level and filing status. This calculator computes both self-employment tax (15.3% on 92.35% of net profit, up to the Social Security wage base) and an estimated federal income tax using 2026 brackets and your standard deduction, then splits the total into a suggested quarterly payment.

Why is self-employment tax calculated on 92.35% of my profit instead of 100%?

The 92.35% factor exists because W-2 employees only pay Social Security and Medicare tax on their wages, not on the employer's matching half. Since a self-employed person is effectively both employee and employer, the IRS lets you deduct a notional employer-equivalent portion before applying the 15.3% rate, so the SE tax base roughly matches what a W-2 employee's payroll tax would be on similar gross pay.

Does the Social Security wage base cap apply to self-employment tax?

Yes. The 12.4% Social Security portion of SE tax only applies up to the annual wage base — $184,500 for 2026, up from $176,100 in 2025. Once your SE tax base (net profit × 92.35%) exceeds that cap, the 12.4% portion stops accruing, but the 2.9% Medicare portion keeps applying with no cap at all, and the 0.9% Additional Medicare Tax can kick in on top of that above $200,000 (Single/Head of Household) or $250,000 (Married Filing Jointly).

Can I deduct my self-employment tax?

You can deduct one-half of your self-employment tax as an adjustment to income when calculating federal income tax — this calculator applies that automatically. Note that the deductible half only covers the 12.4% Social Security and 2.9% Medicare portions (the traditional 15.3% SE tax); the 0.9% Additional Medicare Tax is explicitly excluded from this deduction under IRS rules.

Why does the IRS want quarterly payments instead of one annual payment?

The US tax system is pay-as-you-go — the IRS expects tax to be paid throughout the year as you earn income, not in one lump sum the following spring. Since 1099 contractors have no employer withholding taxes automatically, the IRS requires quarterly estimated payments (Form 1040-ES, due mid-April, mid-June, mid-September, and mid-January) for anyone who expects to owe $1,000 or more. Underpaying can trigger an IRS underpayment penalty even if you pay the full balance by the April filing deadline.