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Invoice System

Community
kazukinagata
invoice-system

This skill should be used when the user asks about the invoice system (インボイス制度), qualified invoices (適格請求書), registration numbers (登録番号), input tax credits (仕入税額控除), the 20% special measure (2割特例), the 30% special measure (3割特例), tax-exempt businesses (免税事業者), transitional measures (経過措置), small-amount exceptions (少額特例), corrected invoices (修正インボイス), or any related topics. Trigger phrases include: "インボイス", "適格請求書", "登録番号", "仕入税額控除", "2割特例", "3割特例", "免税事業者", "経過措置", "少額特例", "修正インボイス", "返還インボイス", "簡易インボイス", "インボイス登録", "T番号", "適格請求書発行事業者".

Overview

Publisherkazukinagata
Repositoryshinkoku
Skill nameinvoice-system
Stars
366
Forks
32
Bundled files
7
LicenseMIT
Links
Skill sourceRepository
  • Markdown instructions

    A SKILL.md file the model loads on demand, so it only costs tokens when a request actually matches.

  • Works with any LLM

    AI skills are plain Markdown, not provider-specific code, so this works with GPT, Claude, Gemini, Grok, or a local model.

  • 7 bundled files

    Scripts, templates, and references the model can read while it works. Files are read-only and never executed.

  • Open source

    Published by kazukinagata on GitHub. Read the source before you install it.

Installation

Install the Invoice System AI skill in TypingMind to use it with any LLM, or drop it into another agent that reads SKILL.md.

1

Install in TypingMind

TypingMind installs a skill straight from its GitHub folder — it reads SKILL.md, bundles the resource files, and stores the result locally.

  1. Open the app and go to Plugins → Skills.
  2. Choose "Install from GitHub".
  3. Paste the skill folder URL below and confirm.
    https://github.com/kazukinagata/shinkoku/tree/main/skills/invoice-system
  4. Enable the skill in any chat where you want it available.
Plugins → Skills → Add skill → From GitHub URL, then paste the folder URL and press Continue.
2

Install in another agent

Any agent that reads the Agent Skills format can use this skill — copy the folder into that agent's skills directory.

Claude Code — .claude/skills
git clone --depth 1 https://github.com/kazukinagata/shinkoku.git /tmp/shinkoku
mkdir -p .claude/skills
cp -r /tmp/shinkoku/skills/invoice-system .claude/skills/invoice-system
Restart Claude Code after copying so it picks up the new skill.

Use it in TypingMind

Enable Invoice System in any TypingMind chat and the model takes it from there. Its name and description sit in the system prompt, and the moment a request matches, the model loads the full instructions itself — you never invoke it by hand, and it costs no tokens until it is actually used.

The model loads Invoice System on its own as soon as a request matches it.

Works with any AI model

AI skills are plain Markdown instructions rather than provider-specific code, so Invoice System is not tied to the model it was written for. Install it once in TypingMind and use it with GPT-5, Claude, Gemini, Grok, DeepSeek, Mistral, Llama, or a local model you run yourself — all on your own API keys.

  • Loaded only when it is needed

    The system prompt carries just the name and description. The instructions are fetched on the first matching request, so an idle skill costs nothing.

  • Switch models mid-chat

    Because the skill is instructions rather than code, changing model does not break it — the next model reads the same SKILL.md.

Skill instructions

This is the SKILL.md content the model loads. Read it before installing — a skill is instructions your model will follow.

インボイス制度（Invoice System）

適格請求書等保存方式（インボイス制度）に関する包括的な知識ベース。 制度の概要、記載要件、経過措置、仕入税額控除ルール、登録判断を支援する。

制度概要

インボイス制度（適格請求書等保存方式）は、令和5年（2023年）10月1日に開始された消費税の仕入税額控除に関する制度。課税事業者が仕入税額控除を受けるためには、原則として「適格請求書発行事業者」が発行する「適格請求書（インボイス）」の保存が必要となる。適格請求書発行事業者になるには税務署への登録申請が必要で、登録番号（T+13桁）が付与される。

令和8年度税制改正大綱（R7.12.26閣議決定）により、3割特例の新設、経過措置スケジュールの5段階化など大幅な変更がある。

クイックリファレンス

登録番号の形式

  • T + 13桁の数字
  • 法人: T + 法人番号（例: T1234567890123）
  • 個人: T + 固有番号（マイナンバーとは異なる）

適格請求書の6つの必須記載事項

  1. 発行事業者の氏名又は名称及び登録番号
  2. 取引年月日
  3. 取引内容（軽減税率対象品目の明示含む）
  4. 税率ごとに区分した対価の額及び適用税率
  5. 税率ごとに区分した消費税額等
  6. 受領者の氏名又は名称

現行の経過措置一覧（令和7年時点）

措置内容適用期限
2割特例売上消費税額の20%を納付R8.9.30を含む課税期間まで
免税事業者仕入控除80%→70%→50%→30%→0%R11.10.1で完全移行
少額特例税込1万円未満はインボイス不要R11.9.30まで
少額返還インボイス免除税込1万円未満は返還インボイス不要恒久措置

消費税額の端数処理

  • 1インボイスにつき、税率ごとに1回の端数処理
  • 切捨て・切上げ・四捨五入いずれも可（事業者の選択）
  • 行ごとの端数処理は不可

リファレンスファイル参照ガイド

質問の内容に応じて、以下のリファレンスファイルを参照する:

質問カテゴリ参照ファイル
適格請求書の記載事項・種類・端数処理references/qualified-invoice-requirements.md
経過措置のスケジュール・控除率・期限references/transitional-measures-timeline.md
仕入税額控除の要件・例外・保存ルール/tax-invoice-credit-context を実行する
登録すべきか・計算方法の選択references/decision-flowchart.md
実務上のよくある間違い・注意点references/common-pitfalls.md
登録申請・取消手続き・基準期間references/registration-procedures.md
BtoC事業者の判断・価格戦略references/btoc-and-pricing-strategy.md
その他の質問・特定状況references/faq.md

回答パターン

ユーザーの質問に回答する際は、以下の構造に従う:

1. 結論（Answer）

質問に対する明確な回答を最初に提示する。

2. 根拠（Legal Basis）

関連する法令・通達を示す。例:

  • 「消費税法第57条の4に基づき、適格請求書の交付義務があります」
  • 「R8大綱により、R9年分から3割特例が新設されます（個人事業主のみ）」

3. 計算例（Calculation Example）

該当する場合は具体的な数値例を示す。金額は int（円単位の整数）で、端数処理ルール（CLAUDE.md 記載）に従う。

4. 注意点（Caveats）

  • 落とし穴や例外事項を指摘する
  • references/common-pitfalls.md の該当項目を参照

5. 免責事項（Disclaimer）

回答の末尾に以下を付記する:

この情報は一般的な税法の解釈に基づくものであり、個別の状況により異なる場合があります。具体的な判断は税理士等の専門家にご相談ください。

他スキルとのクロスリファレンス

関連スキル用途参照タイミング
consumption-tax消費税の計算・申告書作成消費税額の具体的な計算が必要な場合
journal仕訳入力・帳簿管理インボイスに基づく仕訳の記帳方法
reading-invoice請求書画像のOCR読取紙のインボイスをデータ化する場合
tax-advisor税務全般のアドバイスインボイス以外の税務相談を含む場合
settlement決算処理消費税の経理処理を確認する場合

免責事項

  • 本スキルの情報は令和8年度税制改正大綱（令和7年12月26日閣議決定）までの内容を反映している
  • 国会での法案審議・成立により内容が変更される可能性がある（特に3割特例、5段階スケジュール）
  • 個別具体的な税務判断は、税理士等の専門家への相談を推奨する
  • インボイス制度の経過措置は年度ごとに適用条件が変わるため、適用年度を必ず確認すること

Bundled files

The model reads these on demand while the skill is loaded. They are exposed as readable files and are never executed.

Frequently asked questions

What does the Invoice System AI skill do?

This skill should be used when the user asks about the invoice system (インボイス制度), qualified invoices (適格請求書), registration numbers (登録番号), input tax credits (仕入税額控除), the 20% special measure (2割特例), the 30% special measure (3割特例), tax-exempt businesses (免税事業者), transitional measures (経過措置), small-amount exceptions (少額特例), corrected invoices (修正インボイス), or any related topics. Trigger phrases include: "インボイス", "適格請求書", "登録番号", "仕入税額控除", "2割特例", "3割特例", "免税事業者", "経過措置", "少額特例", "修正インボイス", "返還インボイス", "簡易インボイス", "インボイス登録", "T番号", "適格請求書発行事業者".

Why use Invoice System on TypingMind?

Because you install it once and use it with any model. Invoice System is plain Markdown rather than provider-specific code, so the same skill runs on GPT-5, Claude, Gemini, Grok, or a local model — and you can switch model mid-chat without it breaking. TypingMind runs on your own API keys, so you pay providers directly instead of a per-seat subscription, and your skills and chats stay in your own storage.

How do I install Invoice System in TypingMind?

Open Plugins → Skills → Install from GitHub in TypingMind and paste https://github.com/kazukinagata/shinkoku/tree/main/skills/invoice-system. TypingMind reads its SKILL.md and bundles its files and installs it as a skill you can enable per chat.

Which AI models can use Invoice System?

Any model you connect in TypingMind. AI skills are plain Markdown instructions rather than provider-specific code, so GPT, Claude, Gemini, Grok, and local models can all load this skill when a request matches it.

How many AI models can I use with Invoice System?

As many as you like. As long as a model supports skills, you can use Invoice System with it — GPT, Claude, Gemini, Grok, DeepSeek, Mistral, Llama and more — all on TypingMind with your own API keys.

Is the Invoice System AI skill free?

Yes. It is published on GitHub by kazukinagata under the MIT license. You only pay your own AI provider for the tokens you use.

What are AI skills?

An AI skill is a reusable instruction bundle that teaches an AI model how to do one specific task. It follows the open Agent Skills format: a SKILL.md file with a name and description, plus any scripts, templates or reference files the model may need. The model reads the instructions only when your request matches the skill, so an installed skill costs nothing until it is used.

How are AI skills different from plugins or MCP servers?

A plugin or MCP server gives a model new tools to call — code that runs somewhere and returns a result. An AI skill gives the model knowledge and process instead: how to approach a task, which steps to follow, what good output looks like. Skills are plain Markdown, so they need no server, no API key and no runtime, and they work with any model.

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