Browser-based assistance for preparing US federal and state tax returns on FreeTaxUSA using user-provided tax documents. It can help extract information, research tax rules, and fill forms, but the user must review and submit the return.

Use it to prepare a tax return and fill FreeTaxUSA forms from documents such as W-2s and 1099s. It does not provide tax advice or submit the return automatically.

It reduces manual form entry while keeping sensitive values and the final submission under the user's control.

freetaxusa — Skill for Claude Code by sshh12

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add sshh12/claude-plugins --skill freetaxusa

Clone the repo

git clone --depth 1 https://github.com/sshh12/claude-plugins

Made for: Claude Code.

Or install freetaxusa, the plugin that ships this one along with the rest of its 1 skill.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/sshh12/claude-plugins/freetaxusa.svg)](https://agentmods.dev/skills/sshh12/claude-plugins/freetaxusa)

Your own site

<a href="https://agentmods.dev/skills/sshh12/claude-plugins/freetaxusa"><img src="https://agentmods.dev/badge/skills/sshh12/claude-plugins/freetaxusa.svg" alt="Measured on agentmods" height="20"></a>

Per session 55 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,060 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00055	$0.01060
Opus 5	$0.00028	$0.00530
Sonnet 5	$0.00011	$0.00212
Haiku 4.5	$0.00006	$0.00106

Measured 8d ago against content hash dc2db04cf717, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

freetaxusa scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.

The scan reads SKILL.md. This mod also ships 2 executable files (scripts/extract-pdf.js, scripts/pdf.worker.mjs), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/freetaxusa/skills/freetaxusa/SKILL.md · 114 lines

How it starts

The opening of the file, as written. The whole thing — 114 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Disclaimers

This skill is NOT affiliated with, endorsed by, or connected to FreeTaxUSA or TaxHawk Inc.
This is NOT tax advice. This skill automates form filling based on user-provided documents.
This skill will NEVER auto-submit a tax return. The user must review and submit manually.
The user is solely responsible for the accuracy of their tax return.
The agent's tax knowledge may be outdated or incomplete. Phase 3 fetches current-year rules to compensate, but always defer to IRS publications and FreeTaxUSA's built-in guidance over the agent's assumptions.
Sensitive data (SSNs, bank account numbers, IP PINs) must be entered by the user directly into the browser — the agent must not handle these values.

Prerequisites

Browser automation capability — brw skill strongly recommended (loaded in Phase 1); alternatives like Claude for Chrome, Playwright MCP, or Chrome DevTools MCP also work
Node.js 18+
A FreeTaxUSA account (free to create at freetaxusa.com)
Tax documents (W-2s, 1099s, etc.)

Phase Overview

Phase 1: Setup & Consent

See references/PHASE-1-SETUP.md

Explain risks of tax inaccuracy
Load browser automation (brw skill preferred; detect alternatives if unavailable)
Review data privacy implications
Get explicit user consent

Phase 2: Document Discovery

See references/PHASE-2-DISCOVERY.md

Set up secure working folder
Collect and extract all tax documents
Build consolidated document summary
Front-load ALL questions before filing
Generate tax outcome guesstimate

Phase 3: Tax Research

See references/PHASE-3-RESEARCH.md

Fetch current tax brackets and rules
Run life change questionnaire
Flag complexity items needing professional help
Build section-by-section filing plan

Phases 2-3 are iterative. The life change questionnaire or filing plan review may reveal missing documents or new questions. Loop back to Phase 2 as needed — request additional docs, re-extract, update the summary, and revise the filing plan. Do NOT proceed to Phase 4 until all documents are accounted for and the filing plan is approved.

Read the full file on GitHub · 114 lines

Files

What ships with it

9 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

8d ago First seen · 114 lines · 55 tokens per session scan A dc2db04cf717

Subscribe to this mod's changes

freetaxusa is a skill published in the GitHub repository sshh12/claude-plugins (22 stars, last pushed 2mo ago), licensed MIT. It adds 55 tokens to every session and 1,060 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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