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Tax Invoice Credit Context

A background context loader for Japan's invoice system input tax credit rules, specifically the 仕入税額控除 requirements under the shinkoku tax filing plugin. This isn't user-invocable. Claude pulls it automatically when answering questions about claiming input tax credits. It walks through the basic two-part requirement (qualified invoices plus ledger), checks against the six permanent ledger-only exceptions like public transit and vending machines, explains the transitional credit rates for purchases from tax-exempt businesses (80% stepping down to zero), and covers the three deduction methods based on taxable sales ratio. If you're building tax tools for Japanese businesses navigating the invoice system transition, this gives Claude the structural knowledge to answer credit eligibility questions without users needing to invoke anything manually.

skills.sh installs
189
GitHub stars
368
last updated
Aug 21, 2026

Install

$ npx -y skills add kazukinagata/shinkoku --skill tax-invoice-credit-context --agent claude-code

Installs into .claude/skills of the current project.

Files

インボイス仕入税額控除コンテキスト(Input Tax Credit Context)

このスキルはインボイス制度における仕入税額控除の要件・例外に関するコンテキストを提供する。

仕入税額控除の情報提供

仕入税額控除に関する回答を行う際は、references/input-tax-credit-rules.md を読み込んで以下を実行する:

  1. 原則(適格請求書+帳簿の保存)を確認して案内する
  2. 帳簿のみ保存の恒久特例6類型(公共交通機関・自販機・郵便等)への該当を確認する
  3. 免税事業者からの仕入れに係る経過措置の控除率(80%→70%→50%→30%→0%)を案内する
  4. 課税売上割合に応じた控除方式(全額控除・個別対応方式・一括比例配分方式)を説明する
  5. 保存期間(7年間)と電子取引データ保存の要件を案内する

参照ファイル

ファイル内容
references/input-tax-credit-rules.md仕入税額控除の原則・帳簿記載要件・恒久特例6類型・経過措置・課税売上割合と控除方式

Sponsors

Details

Repository
github.com/kazukinagata/shinkoku
Category
Finance & Trading
License
MIT
First seen
Jun 3, 2026

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