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Japan's Official 2026 Year-End Tax Adjustment Software Is Out — Free, Ready From December 1

Many workers in Japan still fill out their year-end tax adjustment forms by hand. The tax agency just released the official version of free software for doing it on a phone or computer instead.

Japan's Official 2026 Year-End Tax Adjustment Software Is Out — Free, Ready From December 1
  • On October 1, 2026, Japan's National Tax Agency released the official 'nenchō software' for Reiwa-8 year-end tax adjustment, usable for procedures from December 1, 2026 onward, free to download for phone or computer.
  • The software lets you enter deductions (insurance, dependents...) on screen instead of writing them on a paper form.
  • Starting October 5, 2026, the agency's 'Futaba' tax-consultation chatbot also began accepting questions specifically about the 2026 year-end adjustment, available 24 hours a day including weekends.

The official software is out

Many people still fill out year-end tax adjustment paperwork by hand on paper.

On October 1, 2026, Japan's National Tax Agency released the official version of its 'nenchō software' for the Reiwa-8 tax year, along with an operating manual.

With this software, you can enter information like insurance premium deductions or dependents directly on your phone or computer screen instead of on a paper form.

This Reiwa-8 version of the software supports year-end adjustment procedures carried out from December 1, 2026 onward.

Where to get the software

There are two ways to get it. On a phone, search for '年末調整 国税庁' (year-end adjustment, National Tax Agency) on the App Store, Google Play, or Microsoft Store.

On a computer, you can download the Windows or Macintosh version directly from the agency's page. The software is completely free.

Another channel: the Futaba chatbot

Also starting October 5, 2026, the agency's tax-consultation chatbot 'Futaba' began accepting questions specifically about the Reiwa-8 year-end adjustment.

The chatbot is available 24 hours a day, including weekends and nights, but since an AI generates the answers, don't enter personal information into it.

Words in this article

年末調整ねんまつちょうせい
year-end tax adjustment
年調ソフトねんちょうソフト
year-end adjustment software
控除こうじょ
deduction
扶養家族ふようかぞく
dependent family member
正式版せいしきばん
official version
操作マニュアルそうさマニュアル
operating manual
税務相談ぜいむそうだん
tax consultation

Notes

This article was checked on October 9, 2026.

How to use the software and which environments it supports can change, so before using it, check the latest information on the agency's page.

Source: 国税庁 (1 Oct 2026)