incorporation

incorporation is a skill for Claude Code from kazukinagata/shinkoku. It costs 127 tokens per session (1,764 once invoked), scanned A, original, MIT.

A guide for moving from working as an individual business owner to operating through a company in Japan. It covers company types, setup steps, officer pay, taxes, and social insurance.

In plain words
What is it for?
Use it to simulate individual-versus-company taxes, choose between a corporation and a limited liability company, plan officer compensation, and review incorporation procedures.
Why use it?
It helps compare the total burden of staying self-employed with forming a company, including taxes and social-insurance payments. It also highlights trade-offs instead of assuming incorporation is always better.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the shinkoku plugin — 24 skills shipped together

Good fit Use it to simulate individual-versus-company taxes, choose between a corporation and a limited liability company, plan officer compensation, and review incorporation procedures.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/kazukinagata/shinkoku/incorporation
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add kazukinagata/shinkoku --skill incorporation
Clone the repo
git clone --depth 1 https://github.com/kazukinagata/shinkoku

Made for: Claude Code.

Or install shinkoku, the plugin that ships this one along with the rest of its 24 skills.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for incorporation

README.md
[![agentmods](https://agentmods.dev/badge/skills/kazukinagata/shinkoku/incorporation/github.svg)](https://agentmods.dev/skills/kazukinagata/shinkoku/incorporation)
Your own site
<a href="https://agentmods.dev/skills/kazukinagata/shinkoku/incorporation"><img src="https://agentmods.dev/badge/skills/kazukinagata/shinkoku/incorporation/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for incorporation

Your own site · 80×15
<a href="https://agentmods.dev/skills/kazukinagata/shinkoku/incorporation"><img src="https://agentmods.dev/badge/skills/kazukinagata/shinkoku/incorporation.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 127 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,764 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00127 $0.01764
Opus 5 $0.00063 $0.00882
Sonnet 5 $0.00025 $0.00353
Haiku 4.5 $0.00013 $0.00176

Measured 13d ago against content hash f245ffb51cd0, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

incorporation scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 13d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/incorporation/SKILL.md · 121 lines

How it starts

The opening of the file, as written. The whole thing — 121 lines — stays where its author put it; the contents beside it link to each section on GitHub.

法人成り(Incorporation)

個人事業主から法人への移行(法人成り)に関する包括的な知識ベース。 税額比較シミュレーション、法人形態の選択、設立手続き、役員報酬戦略を支援する。

設定の読み込み(最初に実行)

  1. shinkoku.config.yaml を Read ツールで読み込む
  2. ファイルが存在しない場合は /setup スキルの実行を案内して終了する
  3. 設定値を把握し、相対パスは CWD を基準に絶対パスに変換する:
    • db_path: MCP ツールの db_path 引数に使用
    • output_dir: 進捗ファイル等の出力先ベースディレクトリ
    • 各ディレクトリ: ファイル参照時に使用

回答の基本方針

1. シミュレーション積極提示

  • 法人成りの相談には、必ず税額シミュレーションを提示する
  • ユーザーの所得レベルに応じた具体的な数値比較を行う
  • 税額だけでなく社会保険料も含めた総負担額で比較する
  • 「法人成りすべき」と断定せず、メリット・デメリット双方を提示する

2. 正確性の担保

  • 回答は必ず references/ ディレクトリ内のファイルを根拠とする
  • 一般知識や推測で回答しない。根拠が見つからない場合はその旨を明示する
  • 金額・税率・要件は reference ファイルの数値を引用する
  • 条文・通達の参照を回答に含める(例: 法人税法第66条、会社法第575条)

3. 回答の構造

以下の構造で回答を組み立てる:

  1. 結論を先に: 法人成りの有利/不利の概要
  2. シミュレーション: 個人 vs 法人の税負担比較
  3. 具体的な手続き: 必要なステップと届出
  4. 注意点・落とし穴: よくある失敗パターン
  5. 免責事項: 回答の末尾に必ず disclaimer を付記

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
個人 vs 法人の税額比較・損益分岐 references/tax-simulation.md
株式会社 vs 合同会社・設立手続き references/corporate-forms.md
役員報酬の設定・社会保険戦略 references/compensation-strategy.md

回答パターン

パターンA: 法人成りすべきか

  1. 現在の事業所得をヒアリングする(不足情報は質問する)
  2. references/tax-simulation.md の所得レベル別シミュレーションで該当区分を特定
  3. 個人 vs 法人の税負担を具体的な金額で比較
  4. 社会保険料の差額も含めた総合判断を提示
  5. 注意: 「すべき」と断定せず判断材料を提供する

パターンB: いつ法人成りすべきか

  1. 現在の所得と今後の見通しをヒアリングする
  2. references/tax-simulation.md の損益分岐点(事業所得800万円前後)を提示
  3. 消費税の免税リセット効果(references/tax-simulation.md)を説明
  4. references/corporate-forms.md のタイミング最適化(決算月の選択等)を案内
  5. インボイス登録済みの場合の注意点を付記

パターンC: どの法人形態にすべきか

  1. 事業の規模・業種・将来計画をヒアリングする
  2. references/corporate-forms.md の株式会社 vs 合同会社の比較表を提示
  3. 1人法人(マイクロ法人)の検討が適切かを判定
  4. 設立費用・ランニングコストの比較を具体額で示す
  5. 社会的信用・資金調達の観点からの助言を付記

パターンD: 設立手続きを教えて

  1. references/corporate-forms.md の設立手続きフローを提示
  2. 必要書類・届出先・期限を一覧で示す
  3. 個人事業の廃業手続きも案内
  4. 消費税のインボイス登録移行の注意点を付記
  5. 税理士・司法書士への依頼が推奨される場面を説明

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
tax-advisor 所得税の税率・控除の詳細、ライフプランニング 法人成り前の個人税額計算、iDeCo・小規模企業共済との比較
invoice-system インボイス制度・消費税の経過措置 法人成り時のインボイス登録移行、2割特例の適用判定
consumption-tax 消費税の計算方法・簡易課税 法人の消費税負担のシミュレーション

Read the full file on GitHub · 121 lines

Files

What ships with it

3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 13d ago First seen · 121 lines · 127 tokens per session scan A f245ffb51cd0

Subscribe to this mod's changes

incorporation is a skill published in the GitHub repository kazukinagata/shinkoku (359 stars, last pushed 3d ago), licensed MIT. It adds 127 tokens to every session and 1,764 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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