The sum of $10,000 referred to in cl. 2 (a) of the agreement was apparently paid to the appellant's solicitor on the signing of the agreement. There was a change of solicitors and on 31st October 1969 the appellant's new solicitor received from her former solicitor $7,490, the balance of the $10,000, after fees amounting to $2,500 and duties amounting to $10 had been deducted. Although the sum of $40,000 mentioned in cl. 2 (b) fell due for payment on or about 30th October 1969 and the further sum of $15,250 fell due on or about 20th November 1969, those sums were not paid on those dates and no explanation was given of this failure to observe the contractual requirements; the appellant's solicitor simply said in evidence: "The payments were not made and we did not ask for them." On 4th February 1970 the Commissioner, claiming to act in pursuance of the powers given by ss. 166, 167, 168 and 205 of the Income Tax Assessment Act 1936-1969 Cth ("the Act"), issued a notice of assessment based on income derived by the appellant during the period from 1st July 1969 to 3rd February 1970. The notice showed the taxable income as $65,250, the tax payable as $39,983.45 and the date for payment as 5th February 1970. On 5th February 1970 the Commissioner served on the company a notice under s. 218 of the Act requiring the company, as a person by whom money was due to a taxpayer, to pay to the Commissioner the amount of $39,983.45 claimed to be due by the appellant in respect of tax. The company did not immediately comply with the notice but eventually sent to the appellant's solicitor a letter, which was received about the end of June 1970, requesting the appellant to sign a document indemnifying the company if it made the payment demanded. On 1st July 1970 the appellant's solicitor refused this request and said that he would neither authorize the company to pay the Commissioner nor ask it to refrain from making the payment, but asked the company, if it did pay the Commissioner, to send the balance to the appellant. On 21st July 1970, the company finally paid $39,983.45 to the Commissioner and on the same day paid $15,266.55, the balance of the sum of $65,250, to the appellant.