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Calculators and data

Can ChatGPT do my taxes?

No. ChatGPT can't file a return. It can explain rules and do math. The Tax Calculator server gives a quick US federal estimate for a single filer, and nothing more.

No. ChatGPT can't file taxes. The Tax Calculator server gives a US federal estimate for a single filer. It runs locally, so ChatGPT can't reach it without a tunnel. Use tax software or a preparer to file.

Connect free in 1 minute See all Tax Calc tools

What you get

Two offers, federal tax

Before state tax and FICA

Figures
OfferAfter federal tax
95,00082,651.00
140,000117,333.00
Difference a year34,682
Example from "Compare two job offers". Invented names, real math from the tools.

Tax Calc is free. Free vs Pro

Without a tool, and with the tool

Without a tool

ChatGPT can explain tax terms and walk through a calculation, but it can't file for you and can get bracket numbers wrong. Treat any figure it gives as a draft to check.

With Tax Calc

The Tax Calculator server has one tool. It takes gross income, subtracts the $15,750 standard deduction, which is the 2025 tax-year figure, applies the single-filer federal brackets and returns taxable income, federal tax, effective rate and after-tax income. No state tax, credits or other filing status. It runs locally (Claude Desktop, Claude Code, Cursor) and isn't hosted, so ChatGPT can't reach it without a tunnel.

An example, from prompt to finished file

Example scenarios built on the real tools of Tax Calc. Names and amounts are invented.

Example · Single filer comparing a job offer

Can ChatGPT do my taxes

You

Estimate federal income tax on 95,000 gross, single filer.

  1. us_federal_tax Applies the standard deduction and the brackets
Result

Taxable income, estimated federal tax, effective rate and after-tax income for 95,000.

Example · Jordan Ellis, software tester in Columbus, Ohio, single filer

Compare two job offers

You

I have offers at $95,000 and $140,000. Estimate federal income tax and take-home for each.

  1. us_federal_tax Estimates tax on $95,000: taxable $79,250, tax $12,349.00, 13.0%
  2. us_federal_tax Estimates tax on $140,000: taxable $124,250, tax $22,667.00, 16.2%
Result

After federal income tax: $82,651.00 against $117,333.00. The higher offer keeps $34,682 more per year before state tax and FICA.

About 10 min saved (estimate)

Example · Maya Thompson, freelance copywriter in Denver, Colorado

Set aside for quarterly payments

You

I expect about $62,000 this year. Roughly how much federal income tax is that?

  1. us_federal_tax Estimates tax on $62,000 after the $15,750 standard deduction
Result

Taxable income $46,250, estimated federal tax $5,311.50, effective rate 8.6%. Maya plans about $1,330 per quarter for income tax and adds self-employment tax separately.

About 8 min saved (estimate)

Common mistakes with this job

  • Filing from a chat answer.
  • Forgetting state and payroll taxes.
  • Using a single-filer estimate when you file jointly.

Connect in 1 minute

Tax Calc runs on your machine. One line with Node.js, or the .mcpb file for Claude Desktop.

Run it locally (Node.js 18+)

npx -y @theluckystrike/mcp-tax-calc

Questions

Can ChatGPT do my taxes?
No. ChatGPT can't file taxes. The Tax Calculator server gives a US federal estimate for a single filer. It runs locally, so ChatGPT can't reach it without a tunnel. Use tax software or a preparer to file.
Which filers does it cover?
Single filers with the standard deduction of $15,750, using the bracket table in the code. It doesn't cover joint filing, itemized deductions, credits, state tax, FICA or self-employment tax.
Is it accurate enough to file?
No. The code calls the brackets approximate planning values. Use it to plan, then file with proper software or an accountant.
Does it work for the UK, EU or Poland?
No. It estimates US federal income tax only.

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