An open-source "Tax Filing Skill" that automates tax-return workflows for Claude Code has been published on GitHub, handling everything from reading tax documents to computing federal and state taxes and filling out official PDF forms.
Open Source · Claude Code Skill
An AI Skill That Files Your Taxes Inside Claude Code
A newly published open-source extension takes a folder of tax documents, calculates federal and state liability, and fills official IRS & state PDF forms automatically — drawing attention among engineering-minded users.
160
GitHub stars gathered
20
Forks of the repository
4
Folder stages in the pipeline
How the workflow moves your data
source/
Input docs: W-2s, 1099s, brokerage & prior-year returns
→
work/
Intermediate data & tax calculations, incl. capital gains
→
forms/
Blank PDFs pulled from IRS.gov & state sites
→
output/
Filled PDFs, refund summary & verification checklist
Handles Form 1040, Schedule D and Form 8949 federally, plus state returns such as California's Form 540. PDFs are extracted with pdfplumber, with rules to curb context consumption.
Where it works
Produced results equivalent to TurboTax in one comparison
Surprising accuracy of the auto-generated legit PDF forms
Year-agnostic — looks up latest rates & deductions each run
Where it falls short
Some generated forms had accuracy issues and mistakes
Complex returns & special deductions need manual fixing
Prompt-injection and context-management risks are noted
The bottom line
The output is a set of legal documents — final verification, signing and IRS compliance stay the user's responsibility.
Users are mainly engineering-oriented, and hybrid use alongside FreeTaxUSA or TurboTax is seen as the practical approach.
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