What is the Japan Invoice System skill used for?

It provides specialized guidance on the 'Qualified Invoice System' (インボイス制度) to ensure your software development and accounting workflows meet Japanese legal standards for consumption tax.

Does this skill support the latest 2026 Japanese tax reforms?

Yes, it reflects the R8 tax reform outline, including the new 30% special measure and the updated 5-stage transitional schedule.

Can it help me verify if an invoice is legally valid?

It can guide you through the six mandatory requirements for a 'Qualified Invoice,' such as the registration number (T-number), applicable tax rates, and specific rounding rules.

Is it suitable for small businesses or tax-exempt entities?

Yes, it includes specific modules for 'small-amount exceptions' and 'transitional measures' designed specifically for businesses navigating the move from tax-exempt to taxable status.

Japan Invoice System Expert

Name: Japan Invoice System Expert
Author: kazukinagata

bykazukinagata

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323

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Productivity & Workflow

Navigates and automates compliance for the Japanese Invoice System (インボイス制度), including tax credits, registration verification, and transitional measures.

The Japan Invoice System skill provides a comprehensive knowledge base and implementation guide for the Qualified Invoice System (適格請求書等保存方式) introduced in October 2023. It assists users in verifying registration numbers (T+13 digits), ensuring invoices contain all six mandatory fields, and applying complex transitional measures like the 20% and 30% special rules. This skill is essential for developers building accounting software or business owners managing tax-exempt transitions within the Japanese market, offering up-to-date guidance based on the latest R8 tax reform outlines.

Key Features

01Provides guidance on the six mandatory items for Qualified Invoices and simplified versions.

02Calculates consumption tax based on specific rounding rules (one-time per invoice).

03Verifies 'T+13' registration number formats and legal requirements for issuers.

04Navigates transitional measures including the 20% rule and the 5-stage schedule through 2029.

05Supports decision-making for tax-exempt businesses transitioning to taxable status.

06323 GitHub stars

Use Cases

01Determining the most tax-efficient calculation method (standard vs. simplified vs. special measures).

02Generating code for invoicing systems that must comply with Japanese tax law.

03Auditing digital receipts and accounting entries for input tax credit eligibility.

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add kazukinagata/shinkoku invoice-system

For use in Claude.ai and ChatGPT

Download Skill