Vox Populi Vox Dei
High Tory
Just to re-iterate - it's not 40% of your total gain.
It's 40% of your gain, less the exclusion (importantly you get an exclusion for every year you had the asset) which is then taxed at your marginal rate - so effectively it's below a maximum ~40% of 40% of your gain.
But the above example (see a few posts earlier) suggests otherwise unless I'm misunderstanding you? I mean, if you hold for two years, the exclusion doesn't go to R80 000 (R40 000x2), correct? It stays at R40 000.