Domain Names are basically Licensed to you. You do not own them. The length of a domain name registration in .au zone is two (2) years. Other zones have different lengths of domain name registration. For example a .com domain can be registered for a minimum of one (1) year.
90 days before your domain is due for license renewal, you are advised by email.
As Atcom Host would look after this for you, you can be assured we will renew your domain on time.