Determine the taxable income of Mr and Mrs Khumalo for the 2019 year of assessment. Mr and Mrs Khumalo, both under 65, are married in community of property. They have the following income and expenditure for the year ended 28 February 2019:

Income

Salary: Mr Khumalo 280 000

Salary: Mrs Khumalo 120 000

Interest(joint account) 40 000

Dividends (from South African companies) 16000

Street vendor sales (Note 1) 24 000

Rental from a flat (Note 2) 96 000

Expenses relating to flat 9 000

Notes:

1. Mrs Khumalo runs a street vending stall on the weekends. Her net income from this amounted to R 24 000 for the 2019 year of assessment.

2. Flat rentals Mrs Khumalo inherited the flat from her father and the will stated that the flat does not fall into the joint estate.

List FOUR (4) criteria of a good tax system.