The TNF 300.00 form IS NOT AVAILABLE IN the old CNP and IS SONO. KNP ISNA: new version of TNF 300.00
Dear taxpayers,
We would like to inform you that starting from April 15, 2026, a new version of the tax reporting form 300.00 — Value Added Tax Declaration for 2026 - will be available in the new Taxpayer's Office of the Integrated Tax Administration System (ISNA).
What's new?
The updated form has been prepared taking into account modern requirements and simplified tax reporting procedures.
Up-to-date information and instructions for filling in are included, which will help avoid mistakes when submitting.
Please note:
The TNF 300.00 form IS NOT AVAILABLE in the old CNP and IS SONO. We recommend that everyone switch to the new platform for up-to-date information and reporting.

Source : https://www.gov.kz/memleket/entities/kgd-kostanay/press/news/details/1202404?lang=kk