How to obtain the tax file number algorithm

Original Published Date
Tax Category
Tax preparation
Business accounting
Investment bodies
Resource Type
Guides and instructions

The tax file number (TFN) algorithm is a mathematical formula that tests the validity of numbers quoted as TFNs. Its use in software is recommended as it will minimise TFN errors and may reduce the need for contact between your organisation or clients and the ATO.

The TFN algorithm is available in the Online services for digital service providers (DSPs) collaboration hub. To obtain a copy of the algorithm you will need to:

  1. Register for Online services for DSPs
  2. Login
  3. Download the algorithm from the tax time section of the collaboration hub

The factsheet contains information about your obligations and responsibilities for obtaining access to the TFN algorithm.

File Size Upload date
Updated TFN algorithm fact sheet - clean (PDF) 172.84 KB 15 Aug 2019
Updated TFN algorithm fact sheet - tracked (PDF) 173.7 KB 15 Aug 2019

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