William, an accountant, received the following payments:

1. $1,000 honorarium for acting as treasurer for the local netball association (2 marks)
2. $20,000 lump sum to entice him to move to another firm. William accepted the offer and commenced employment (2 marks)
3. $200 cash prize for winning the office footy tipping competition. (1 mark)

What amounts would be considered assessable income? Provide reasoning and references for your decision