SARS have released their 2016 statistics, available here.
Of significance again, 36% of all tax collections in 2015/16 flowed from personal income tax with the majority collected through PAYE. With a tough economic climate in 2017 unlikely to support employment, SARS is going to be under pressure in 2016/17 to match 2015/16 revenue collections.
Pundits expect the Finance Minister to look at ways to collect more tax with some expecting an increase in the top rate of tax (albeit this has been expected in the past and never materialised).