What do I need to use Japan Year-End Tax Adjustment (年末調整)?

Employment; Family; Insurance and pensions paid this year; Housing loan; Other.

Is Japan Year-End Tax Adjustment (年末調整) free to use?

Yes — run it free in the browser playground (no API key needed for the sponsored trial, or bring any provider key), or install it into Claude Code, Cursor, ChatGPT and more via npx pm-claude-skills. MIT-licensed and open source.

Japan Year-End Tax Adjustment (年末調整)

Q: How do I know the Japan Year-End Tax Adjustment (年末調整) output is good?

The skill verifies itself against its own quality checks: Every form name, income limit and deadline is marked to confirm with the NTA or the employer; Dependant and spouse decisions use the family members' own incomes; Each insurance or pension line is tied to a certificate; Items that need a 確定申告 are listed separately.

🔵 Stable🕐 updated 2026-10-05 ✅ 4.8/5 🔷 SkillSpec L3 pm-japan

Use when asked 年末調整の書き方, how do I fill in my nenmatsu chōsei forms, which deductions can I claim at year-end in Japan, 扶養控除等申告書の書き方, 保険料控除申告書, or do I need to file a tax return instead. Produces which forms the person must submit to their employer, line-by-line guidance for their situation, the deductions they can claim through year-end adjustment, what must go to a tax return instead, and a checklist of certificates to gather.

▶ Run it free — no key needed 📝 Grade your existing draft ⬇ Add to Claude (works in Duet) 📱 Use as an app View SKILL.md ↗ What changed

🗣 Say this to your agent

“年末調整の書類、何をどう書けばいいか教えて。妻はパートで年収100万円です。”“iDeCoと生命保険は年末調整でどう書く？”“How do I fill in my year-end adjustment forms in Japan? I have two kids.”“我在日本上班，年末调整要交哪些表？”

What to give it

▸Employment — one employer or several, annual salary estimate, main employer for tax (甲欄)

▸Family — spouse and their income, dependants and their ages and income, anyone with a disability

▸Insurance and pensions paid this year — life, medical, nursing care, earthquake insurance, national pension or iDeCo (小規模企業共済等掛金)

▸Housing loan — first year or later year of the housing loan deduction

▸Other — medical expenses, ふるさと納税, side income, mid-year job change

✅ The bar it holds itself to

Every skill in this library self-verifies — these are this skill's own quality checks, straight from its definition.

✓Every form name, income limit and deadline is marked to confirm with the NTA or the employer

✓Dependant and spouse decisions use the family members' own incomes

✓Each insurance or pension line is tied to a certificate

✓Items that need a 確定申告 are listed separately

✓The output says it is information, not tax advice

⚠️ What it refuses to do

**Listing a dependant whose income is too high.** It causes a back-tax bill later.

**Expecting medical expenses to be handled by the employer.** They need a tax return.

**Throwing away the 源泉徴収票.** It is needed for a return, loans and visa renewals.

**Guessing deduction amounts.** Use the figures on the certificates.

Install

npx pm-claude-skills add --agent claude   # or codex · cursor · gemini · hermes
# or one-line MCP (every skill, any client):
claude mcp add pm-skills -- npx -y -p pm-claude-skills pm-claude-skills-mcp

Related skills

🔌 Embed this skill

Drop this on your blog, docs, or site — it renders a "Run this skill" card:

<div data-pm-skill="jp-year-end-adjustment"></div>
<script src="https://mohitagw15856.github.io/pm-claude-skills/embed.js" async></script>

💬 Discussion

Japan Year-End Tax Adjustment (年末調整) is one of 1326 open-source professional AI agent skills — all SkillSpec L3. Try them all in the browser · ⭐ Star on GitHub · Browse the full catalog