# 1099 Income Tax Calculator

> 1099 self employment tax calculator: estimate 2026 SECA tax at 15.3% on net self-employment earnings plus a quarterly payment planner. Free, no signup.

- **Canonical URL:** https://boringtoolskit.com/self-employment-tax/
- **Category:** Finance & Investing
- **Evidence level:** authored-methodology
- **Reviewed:** July 26, 2026
- **Last verified:** 2026-10-12
- **Privacy:** Inputs and results stay in this browser unless the page clearly labels an external request.

## How it works

Net earnings subject to self-employment tax = net business profit × 92.35%. Social Security and Medicare rates are then applied subject to the entered wages and filing-status thresholds.

## Worked example

$100,000 revenue less $20,000 expenses = $80,000 net profit; $73,880 subject to SE tax after the 7.65% adjustment, an $11,303.64 tax, about $2,825.91 set aside per quarter.

## Assumptions

- The calculation is a federal planning estimate, not a complete tax return.
- State/local tax, credits, QBI, and detailed income-tax brackets are excluded.
- The optional marginal income-tax percentage is user-entered and does not calculate progressive brackets.

## Common questions

### Why is net profit multiplied by 92.35%?

Schedule SE uses a statutory adjustment before applying the Social Security and Medicare portions of self-employment tax.

### What is the deductible half of SE tax?

A portion of self-employment tax is generally deductible when calculating adjusted gross income; it does not reduce the SE tax itself.

### Is the quarterly amount an official estimated payment?

No. It combines simplified SE-tax and optional income-tax estimates. Complete estimated payments depend on the full return and prior-year safe-harbor rules.

## Related tools

- /paycheck-calc/
- /freelance-hourly-rate-calculator/
- /profit-margin-markup-calculator/

## Sources

- [Schedule SE (Form 1040)](https://www.irs.gov/forms-pubs/about-schedule-se-form-1040)
- [Contribution and benefit base](https://www.ssa.gov/oact/cola/cbb.html)

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*Local planning estimate. Verify current terms, rates, and policies before acting.*