NISA Investment Guide

Simulate investment options beyond NISA in Japan

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Why This Tool?

Maxed out your NISA allowance? Compare iDeCo, taxable brokerage accounts, overseas brokers, and savings bonds — see projected growth with tax impact.

Features

• Visual growth chart — See how your investments could grow over time
• 4 investment options — iDeCo, Taxable Brokerage, Overseas Brokerage, Savings & Bonds
• Tax impact simulation — Compare after-tax returns across options
• Adjustable parameters — Set monthly amount, time horizon, and risk tolerance
• Side-by-side comparison — Annual return, tax, and final value in one table

How It Works

1. Set your monthly investment amount and time period
2. Adjust your risk tolerance level
3. Compare projected after-tax returns across investment options

Try it now: https://humancronadmin.github.io/nisa-investment-guide/

Disclaimer: This tool is for educational purposes only and does not constitute financial advice. Consult a qualified financial advisor before making investment decisions.

Privacy

• All simulations run in your browser — no data is sent to any server
• No cookies, no account required
• Works offline after first visit (PWA)

Contributing

Found an error or want to improve the simulator? Contributions are welcome!

1. Fork the repository
2. Create your feature branch (git checkout -b feature/improvement)
3. Commit your changes
4. Open a Pull Request

License

MIT License. See LICENSE for details.