It can suit
Small businesses with low costs, where tax on turnover works out lower than tax on profit, and owners who want the simplest compliance. A micro business may also be VAT registered.
It may not suit
Businesses with high costs or losses (turnover tax ignores costs), and some kinds of business that the rules exclude. Check with SARS or your accountant before you choose.
How Bookkeeping & Invoicing helps
The setup interview asks how you are taxed. For a turnover-tax business it does not show income tax write-off suggestions, puts the TT02 and TT03 dates in the deadline calendar, and lays out the TT03 figures in the year-end pack. You or your accountant submit on eFiling.
A note
This is a plain-English summary, not tax advice. Check your own case with SARS or your accountant.