Tax return filing for 2026 (Reiwa 8): wider Mynaportal linkage and the switch to the "Myna app"Next year, filing your tax return on a smartphone will fill in more data automatically
On September 4, 2026 (Reiwa 8), the National Tax Agency published a page for filing tax returns for 2026 (Reiwa 8). From January 2027 (Reiwa 9), many more people are expected to be able to use Mynaportal (マイナポータル) linkage for salary information. The Myna app (マイナアプリ) became available on August 25, 2026, and people who file with their My Number Card are advised to update the app and complete registration.
- 1. Update the appUpdate to the Myna app from the app store
- 2. RegisterComplete registration in the Myna app
- 3. Start filingStart using the tax return preparation corner
Key points
- From January 2027 (Reiwa 9), more people will be able to use Mynaportal linkage for salary information. Preparation is needed before first use.
- About 4.08 million people used Mynaportal linkage when filing tax returns for 2025 (Reiwa 7).
- Linkage covers withholding slips for salary and public pensions, annual transaction reports for specific securities accounts, medical expenses, donations such as hometown tax (furusato nozei), national pension premiums, life and earthquake insurance premiums, iDeCo, and housing loan deduction documents, among others.
- Linkage requires a My Number Card and a smartphone that can read the card (or an IC card reader/writer).
- On August 25, 2026, the "Myna app" was launched, combining the "Mynaportal app" and the "Digital Authentication app".
What to do in practice
- Check that your My Number Card and smartphone are compatible, and the expiry dates of the card and electronic certificate.
- Update to the Myna app and complete registration in advance.
When you file a tax return, there is a function that automatically fills in information such as your salary and medical expenses from Mynaportal. The National Tax Agency announced that from January 2027 (Reiwa 9), more people will be able to use this method for salary information.
- Filing for 2025 (Reiwa 7)About 4.08 million people used Mynaportal linkage
- August 25, 2026The new "Myna app" becomes available
- From January 2027 (Reiwa 9)Even more people can use linkage for salary information
Points
- With a My Number Card, information is filled into the tax return automatically.
- You need a My Number Card and a smartphone that can read the card.
- Switch to the new "Myna app" and register.
What the words mean
- Mynaportal linkage
- A system that copies your own information held on a government site into your tax return automatically
- National Tax Agency (NTA): NTA: Tax return filing for 2026 (Reiwa 8) gets more convenient with smartphones and Mynaportal linkage!
This article summarizes and explains materials published by government agencies and is not advice on any individual case. Rules can change, so for actual procedures and decisions always check the latest original materials and consult professionals such as tax accountants or labor and social security attorneys. English, Simplified Chinese and Traditional Chinese versions are translations prepared from the Japanese articles for convenience. If anything differs, the Japanese text and the original source take precedence.