About 1099TaxCalculator

What it does

You enter what you billed and what you spent. It estimates self-employment tax (FICA), your federal income tax using the published brackets, and your state income tax, then splits the result across the four IRS Form 1040-ES payment vouchers so you can set money aside as you earn rather than in one lump in April.

There is a page for each combination of role and state, so a rideshare driver in Texas and a freelance developer in California each get figures for their own situation rather than a generic national average. Every page shows which tax year it is for.

Where the numbers come from

This is the part worth being precise about, because most calculators of this kind simply publish whatever numbers someone typed in. The federal figures here are not typed in. They are read directly out of the documents that publish them:

• Federal brackets and the standard deduction — the annual IRS revenue procedure that publishes the inflation-adjusted figures.
• Quarterly payment due dates — read off IRS Form 1040-ES, which prints them. They move when they land on a weekend or a federal holiday, and the IRS has already worked that out.
• The Social Security wage base — the SSA contribution and benefit base.

A scheduled job re-reads those documents and updates the dataset when a published figure actually moves. The figures currently on the site are for tax year2026, read from IRS and SSA documents on 2026-10-04.

What is not verified, and why that matters

The 51 state income tax rates are the exception, and they are a real one. No federal source publishes them. They were entered by hand, and unlike the federal figures there is no automated way on this site to confirm they are still correct.31 of 51 were last checked for the current tax year (against independent compilations); the rest are carried forward unreviewed. No check against a state revenue department has ever been recorded for those.

That means the federal half of any total you see is sourced and dated, while the state half is a best-effort figure that may be out of date. If your state matters to your decision, confirm the rate against your own revenue department before relying on the state total. Every page on the site carries this warning in its footer rather than hiding it on this one.

A related limitation: the calculator applies a single representative rate per state, so it will not reflect state-specific circumstances such as local municipal income taxes, capital-gains treatment differences, part-year residency, or state credits and deductions.

What it is not

It is not tax advice, and using it does not make this site your accountant. Nothing here is a return, a filing, or a substitute for a professional who knows your situation. Your actual liability depends on deductions, credits, other income and filing status that no single-field calculator can see.

The output is an estimate for setting money aside. It is most useful as a discipline — pay yourself first, keep a percentage aside — rather than as a figure to file.

How it is paid for

It is not. There are no ads, no affiliate links, no sponsors and no premium tier. The site sets no cookies, runs no analytics, and has no contact form, because there is nothing to sell and no reason to watch you use it. See the privacy policy for the specifics.

Found something wrong?

Corrections are welcome, especially on state rates. The contact page has the address, and a state rate that has moved is one of the most useful things you could report.