The following is sourced from Fair Work Australia’s website:

Are there any penalties for making a false declaration?

Yes. If you intentionally make a false statement in a statutory declaration, you could be charged with an offence and, if convicted, you could be fined or jailed, or both.

Under section 11 of the Statutory Declarations Act 1959, the penalty for making a false statement in a statutory declaration is four years imprisonment.

( more info at:       http://www.fwa.gov.au)

Ooo, errr. More tea, vicar?