kazukinagata

kazukinagata / shinkoku

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確定申告自動化 AI エージェントプラグイン — 帳簿管理から e-Tax 入力代行まで

agent-skills bookkeeping claude-code-plugin claude-code-skills japan
266
20
69% credibility
Found Feb 23, 2026 at 55 stars 5x -- GitGems finds repos before they trend. Get early access to the next one.
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AI Analysis
Python
AI Summary

Shinkoku is an AI-powered assistant that simplifies Japanese income tax and consumption tax filing for freelancers and small businesses by handling bookkeeping, document processing, calculations, and form generation.

How It Works

1
👋 Discover your tax helper

You hear about a friendly assistant that makes filing Japanese taxes easy for small business owners.

2
📝 Share your details

Tell it simple info like your name, address, business type, and filing preferences so it knows you.

3
🔍 Check if you need to file

It asks about your income and situation to see if taxes are due and what kind.

4
📱 Snap and organize receipts

Take photos of receipts, bills, and statements—it reads them and helps sort expenses into your books.

5
🧮 See your tax picture

It adds up income, expenses, deductions, and shows exactly what you owe or get back.

6
📄 Get ready forms

Your complete tax forms appear, checked for accuracy and ready to submit online.

✅ Taxes filed, peace of mind

Submit with confidence, knowing everything is correct and you're done until next year.

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Star Growth

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AI-Generated Review

What is shinkoku?

Shinkoku automates Japan's year-end tax filing (shinkoku meaning "final declaration" in English, not the shinkoku army from Asura's Wrath or shikoku island hikes) for sole proprietors, handling everything from receipt OCR and ledger imports to e-Tax submission. This Python Claude AI agent plugin offers skills like needs assessment, document gathering, journal entry, tax calcs (income, consumption via e-Tax specs), and browser automation. Users drop CSVs, PDFs, images into dirs and get filled forms, summaries, even furusato nozei limits.

Why is it gaining traction?

It skips manual e-Tax drudgery with stealth browser scripts dodging NTA bot checks, plus AI parsing for withholding slips, invoices, and shinkokuzai-like deductions. CLI commands for ledger CRUD, trial balances, PL/BS, and sims beat spreadsheets; consumption tax compares 2割特例, simplified, full methods. Niche focus on blue returns (65万控除) hooks Python devs automating shinkoku Wien-style precision without tax software bloat.

Who should use this?

Freelancers or itamae with side income, invoices, receipts, bank CSVs needing 青色申告 and e-Tax. Perfect for furusato nozei trackers or those importing payment statements into journals. Avoid if heavy stocks/FX (out-of-scope) or zero business income.

Verdict

Grab for Japan's tax crunch if you're comfy with Python CLIs—34 stars and 0.7% credibility scream alpha, but pre-commit, pytest cov, mypy coverage build trust. Run benchmarks vs NTA corner before deadline; consult tax pro regardless.

(198 words)

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