On 14 August 2017, Tammy Gochi, aged 53, retired from her job as chief executive officer of Megacorp Limited to commence service as a volunteer for Whalepeace International. She received a superannuation lump sum of $160,000 which entirely comprised an element taxed in the fund. PAYG tax of $34,500 was withheld from the lump sum.

During the remainder of the 2017/18 tax year, Tammy also received a superannuation income stream benefit of $40,000 from the fund. PAYG tax of $9,780 was withheld from this amount. The entire amount was taxed in the fund.

Tammy's only other income during the 2017/18 tax year was the gross salary of $36,290 for the period up to the date of her retirement. PAYG tax of $9,035 was withheld by her employer. Tammy has private hospital insurance.

Required:

a.Calculate Tammy's taxable income for the 2017/18 tax year.

b.Calculate Tammy's net tax payable or refundable for the 2017/18 tax year.