To apply for an ETA Visa, your passport should have at least 6 months validity from the date you plan to arrive in Australia.
If you have less than 3 months on your passport when you arrive in Australia, you may* be returned back to your country of origin (or ongoing destination).
Please check your passport expiry date before you apply... Thx
Some airlines will NOT let you travel with them if your passport has less than 6 months until it expires on the day that you travel. Please ensure that your passport has at least 6 months validity on the day that you are travelling.
Most airlines are OK if you have less than 6 months so long as you are only staying less than 2 weeks at the destination country.
The ETA Visa (eVisa) is NON Transferrable. See the refund policy here.