e-Taxソフト（WEB版）
e-Taxソフト（WEB版）is the web-based version of Japan's National Tax Agency's electronic filing and payment system for individual and corporate tax returns. It enables Japanese taxpayers to file their annual income tax returns, consumption tax filings, and other tax documents directly with the NTA, and to pay taxes electronically using a registered My Number card (マイナンバーカード) and an IC card reader. The system is accessed through a web browser and requires installation of a Safari browser extension for IC card authentication and digital signatures.
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1 suggestione-Taxソフト（WEB版）is a browser-based service that runs natively on Apple Silicon Macs through the Safari browser — confirmed support for M1 Macs was documented as early as 2021. There is no downloadable native or Intel-only app to update separately. Since this is a web service delivered through Safari, your ability to use it depends entirely on your Mac running a supported version of macOS with Safari installed, which it will on any reasonably current system. The Safari extension for e-Tax authentication is automatically offered during login at the e-Tax website and works on both Intel and Apple Silicon Macs. As long as you keep Safari and macOS updated, you will continue to have access to this service — there are no Rosetta 2 concerns here because the service itself is browser-based and architecture-agnostic.
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