If you are applying as an adult for conferral of Australian citizenship (also known as grant of citizenship / naturalisation) there are some things you need to know about travel during your citizenship application.
 In general
- You don't become a citizen until your citizenship ceremony (unless you are within one of the few categories who are exempted);
- You must maintain a valid foreign passport and Australian permanent re-entry visa until you become a citizen.
 From Application to Approval
- Under section 24(5) of the Australian Citizenship Act 2007, your application cannot normally be approved while you are physically outside Australia.
- Hence, you need to inform DIAC of any travel in this period.
- Vacations will not be a problem. They look at the residence requirement only when you make the application, normally.
- However, if you leave for a longer period, DIAC will consider whether you still intend to reside in Australia, or maintain a "close and continuing association" with Australia.
- It's also a problem if they send you a letter asking you to come to a citizenship test or interview and you are overseas. You can reschedule, but it complicates things.
 From Approval to Ceremony
- Again, no problems travelling for short vacations or business trips.
- Longer trips may be a problem. You usually only get a few weeks notice of a citizenship ceremony.
- DIAC can still cancel your application if they think you are no longer intending to live in Australia
- It's often difficult or impossible to call 131880 (DIAC citizenship number) from offshore.
- Citizenship ceremony must normally be done in Australia.
 Spouses and Partners of Australian citizens
- Rules are a little more flexible. Application can sometimes be approved while you are offshore (you must still tell DIAC about travel).
- "Close and continuing association with Australia" can include an Australian spouse
- It may be possible to attend a citizenship ceremony at a DIAC office offshore.
 Other applications for Australian citizenship
- These issues do not affect applications for special naturalisation/conferral (eg children of former Australian citizens, stateless persons and certain persons born in Papua before independence).
- They don't affect applications for children under 18;
- Nor do they affect applications for Australian citizenship by descent, or resumption of Australian citizenship.