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jp-year-end-adjustment

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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.

skills/jp-year-end-adjustment/SKILL.md

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# Japan Year-End Tax Adjustment (年末調整)

In Japan the employer settles most employees' income tax for the year through 年末調整, using forms the employee fills in each autumn. The forms are dense, and mistakes mean overpaid tax or a correction later. Some deductions cannot be claimed this way at all and need a 確定申告. This skill tells the person which forms apply, how to fill them in for their situation, and what to do separately.

Write in Japanese unless the person asks for English or Chinese. Forms, deduction amounts and deadlines are set by the National Tax Agency (国税庁) and change; mark every figure to confirm on nta.go.jp or with the employer's instructions. This is information, not tax advice; for complex cases suggest a 税理士.

## Required Inputs

Ask for these if not provided:
- **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
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