What is the maximum time a TFN remains valid?

A Tax File Number (TFN) does not have an expiration date and remains valid for the lifetime of the individual or entity to which it is issued. This means that once a TFN is allocated, it can be used indefinitely for tax purposes, and there is no need to renew or reapply for it. This permanence ensures that individuals and businesses can consistently use the same TFN throughout their interactions with the Australian taxation system, simplifying the process of tax reporting and compliance.

In contrast, other options may suggest temporary validity periods, which do not apply to a TFN. The essence of the TFN’s design is to provide a stable identifier for taxpayers, thus eliminating administrative complexities associated with expiration and renewal procedures.