What types of certificates can this skill read?

It supports life insurance, earthquake insurance, social insurance (National Pension), and small business mutual aid certificates like iDeCo.

Is the output format compatible with other software?

The skill returns standardized JSON objects with cleaned integers for currency, making it easy to pipe data into e-Tax scripts or accounting databases.

Can it process scanned PDF files?

Yes. It first attempts to extract digital text from the PDF. If no text is found (common in scans), it automatically converts the PDF to an image for OCR analysis.

Does it handle Japanese era names like Reiwa and Heisei?

Yes, it automatically converts all Japanese era dates (e.g., Reiwa 6) into the standard Western calendar format (YYYY-MM-DD).

How does dual verification work?

The skill runs two independent AI sub-agents to analyze the same image. If the results match, the data is accepted; if they differ, the user is prompted to choose the correct value.

Tax Deduction Certificate Reader

Name: Tax Deduction Certificate Reader
Author: kazukinagata

bykazukinagata

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323

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Productivity & Workflow

Extracts structured data from Japanese tax deduction certificates using vision-based OCR and dual-agent verification.

This skill automates the extraction of critical financial data from various Japanese tax deduction certificates, including life insurance, earthquake insurance, social insurance, and iDeCo. It employs a robust dual-verification workflow that runs two independent analysis passes to ensure maximum accuracy for sensitive financial figures. The skill intelligently handles PDF text extraction, falls back to high-fidelity OCR when necessary, and standardizes complex Japanese era dates (Reiwa/Heisei) and insurance categories into clean, developer-friendly JSON data ready for e-Tax or accounting software integration.

Key Features

01Intelligent PDF handling with text-to-image fallback for scanned documents

02Dual-agent verification system for high-accuracy financial data validation

03Support for life, earthquake, social insurance, and iDeCo certificates

04Automatic conversion of Japanese era dates to standardized ISO 8601 format

05323 GitHub stars

06Standardized JSON output for seamless integration with tax filing agents

Use Cases

01Automating data entry for annual Japanese tax returns (Kakutei Shinkoku)

02Digitizing physical insurance documents for personal finance management apps

03Verifying scanned certificate accuracy against digital bookkeeping records

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add kazukinagata/shinkoku reading-deduction-cert

For use in Claude.ai and ChatGPT

Download Skill