(1) The amount of penalty tax payable in respect of a tax default is 25% of the amount of tax unpaid, subject to this Division.
(2) The amount of penalty tax payable in respect of a tax default is 75% of the amount of tax unpaid if the Commissioner is satisfied that the tax default was caused wholly or partly by the intentional disregard by the taxpayer (or a person acting on behalf of the taxpayer) of a tax law.
(3) No penalty tax is payable in respect of a tax default if the Commissioner is satisfied that—
(a) the taxpayer (or a person acting on behalf of the taxpayer) took reasonable care to comply with the tax law; or
(b) the tax default occurred solely because of circumstances beyond the taxpayer's control (or if a person acted on behalf of the taxpayer, because of circumstances beyond either the person's or the taxpayer's control) but not amounting to financial incapacity.