National Tax System Renewal (September 24, 2026): Key Procedural ChangesThe tax office's system was renewed, and your mail now carries a number
The NTA renewed the national tax system on September 24, 2026 (Reiwa 8). The formats of some returns, applications, notifications and payment slips, the number printed on notices from tax offices, the e-Tax IP address, and the consent method for electronic delivery of disposition notices have changed. Please check the impact on your own operations.The computer system used by tax offices was renewed on September 24, 2026 (Reiwa 8). The documents sent to you now carry a longer number, and if you tell them that number when you ask a question, things go faster.
- ○Applies: The payment slip's reference number (8 digits) is now an inquiry number (13 digits) field
- ○Applies: Consent to electronic delivery is, in principle, advance blanket consent
- ○Applies: The e-Tax IP address is dynamic (connect by URL)
- ○Applies: Old-style characters can still be used for names and addresses on returns (no change)
- ×Does not apply: Old payment slips with a reference number field become unusable immediately
Until nowFrom September 24
Number fieldReference number (8 digits)Inquiry number (13 digits)
File copy of a returnThere was a file copyNo more file copy
Color of returns-In principle black and white
Consent to receive onlineEach time you applyAll at once, in advance