"The only other provision that it is necessary to mention is a proposed amendment to section 204 of the principal act. As now enacted, that section provides that income tax assessed shall be due and payable on a date specified in the notice of assessment, but not less than 30 days after service of that notice. By reason of credits for provisional tax paid or for tax instalments deducted from earnings, many notices of assessment show, instead of an amount payable by the taxpayer, a refund due to him. As it is inappropriate in such instances to specify in the notice a due date for payment, the proposed amendment will authorise the omission of this particular from the notice. However, the omission would affect the operation of those provisions of the principal act that authorise the amendment of assessments within three years - or, in some instances, six years - from the date on which the tax became due and payable under the assessment. I refer to both amendments that have the effect of increasing the tax in the original assessment, and those that have the effect of reducing that tax. If no date were specified in the notice of assessment, there would be no commencing point for the period within which the assessment might be amended. It is proposed, therefore, that, where no date is specified in the notice of assessment, the thirtieth day after service of the notice shall be a notional due date for payment, from which the period for amendment of the assessment may be reckoned. This amendment will effect a saving in administration without inconvenience or detriment to taxpayers."