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French Personal Tax Advisor (Fiscaliste)

A step-by-step French personal income tax skill covering IR, capital income, rental income, crypto, employee equity, IFI and PER with legally sourced calculations.

UtilitiesIntermediate★ 2,348⑂ 178AI score 9/10Last updated: Aug 10, 2026

What it does

  • Computes French income tax (IR) through a mandatory 12-step chain — gross income → RNI → family quotient → brackets → décote → reductions/credits → social levies → CEHR — showing every intermediate figure.
  • Hard-codes 2025-income (2026 filing) reference values: brackets, allowance caps, PFU and the split 17.2% / 18.6% social contributions, PER ceilings, IFI scale, CEHR and the new CDHR 20% floor, with an explicit ban on inventing rates.
  • Routes each topic to a dedicated reference file: capital income (PFU vs progressive scale), PEA and life insurance withdrawals, rental income (micro/réel, LMNP, SCI IR), startup equity (RSU, BSPCE, stock options, PEE/PERCO), crypto (form 2086), PER, deductions and credits.
  • Ships scripts/calc_ir.py for deterministic verification and auto-reads a project-level foyer.json for household context; example scenarios live in examples/.
  • Declares hard boundaries: inheritance/gifts go to a notary skill, corporate tax and salary-vs-dividend arbitrage to an accountant skill.

Who it's for

  • French tax residents who file their own 2042 return.
  • Startup employees with RSUs or BSPCEs, and investors with crypto disposals.
  • Landlords weighing micro-BIC vs réel for LMNP, or running an SCI taxed at IR.
  • High-net-worth households in IFI, CEHR or CDHR territory.

Usage examples

  1. "Couple, €120k combined, two children — what's the 2026 tax bill?" → full step-by-step calc including the family-quotient cap test (€1,807 per half-share).
  2. "€8,000 of dividends: flat tax or progressive scale?" → both scenarios costed out, plus the warning that the scale option is global for all capital income and irrevocable for the year.
  3. "€50k RSU vesting plus €20k of gains on sale" → cleanly separates the acquisition gain (taxed as salary, box 1TT) from the capital gain (PFU at 31.4%).

· · · Install guide · · ·

Try it now, no install

Paste this into Claude to use the skill without installing anything.

Read the instructions in this file and follow them to help me:
https://raw.githubusercontent.com/romainsimon/paperasse/HEAD/fiscaliste/SKILL.md

What I want: (describe your task here)

If Claude can't open the link, open it yourself and paste the contents instead.

↓ If it works for you, download the ZIP below and install it. Then it runs on its own — no pasting each time.

Install in the Claude app (no terminal)
  1. Download the ZIP with the button below.
  2. In Claude, open Settings → Capabilities and turn on 'Code execution and file creation'. (one time)
  3. Go to Customize → Skills → + → 'Upload a skill' and upload the ZIP.
↓ Download ZIP
Install in Claude Code

Let Claude do it — paste this into Claude Code

Install the skill I found on Claude Skill Mart.
Copy the fiscaliste folder from the GitHub repo romainsimon/paperasse into my ~/.claude/skills/fiscaliste/.
When it's done, tell me in one line what this skill can do.

Install with a command instead

git clone https://github.com/romainsimon/paperasse.git && mkdir -p ~/.claude/skills && cp -r paperasse/fiscaliste ~/.claude/skills/

⚠ This is a third-party skill. Check the source repository before installing.

  1. Open a terminal.
  2. Create the skills directory if needed: mkdir -p ~/.claude/skills
  3. Clone the repository: git clone https://github.com/romainsimon/paperasse.git
  4. Copy just this skill: cp -r paperasse/fiscaliste ~/.claude/skills/
  5. Confirm Python 3 is available if you want the deterministic checker: python3 --version
  6. Optional: copy paperasse/fiscaliste/foyer.example.json to foyer.json in your working folder and fill in your household details so the skill picks them up automatically.
  7. Restart Claude Code and ask something like "simulate my 2025 French income tax" to trigger the skill.
  8. Before relying on any figure, check the last_updated field in the frontmatter against the latest finance law on impots.gouv.fr.
View source on GitHub ↗License: MIT