If it is possible for you to make that payment in full, then that is our recommendation. This means you stay in the good books with the ATO (meaning if you ever need extensions etc they are more likely to grant them), and also means they won't charge you fees, fines or interest.
But, we totally get that sometimes the tax bills sneak up on us or are more than was expected. If you need a payment plan then please complete this form. Note that we cannot guarantee the ATO will approve the request for the payment plan.
