28 February is a date you must diarise. That's when your Second Period (what you're paying for by 28 February of the following year) provisional tax is due.
During this period, you must submit:
Here's how to work out how much you owe SARS
How to calculate your provisional tax in seven steps
Step #1: Your estimated taxable income for the tax year. Remember: If it's over R1 million, you'll automatically be bounced to Tier 2.
Step #4: Subtract half of the total tax payable for the year and you're left with the amount due for the first period of 2011 (which you'll declare and pay by 31 August).
Step #5: Subtract any employees tax deducted for this period (six months).
Step #6: Less any allowable foreign tax credits for this period (six months).
Step #7: Add any outstanding tax fines, as well as interest on this outstanding amount.
And voila! You've calculated your provisional tax!
Remember: If you end up with a negative figure, you simply enter a Nil on your IPR6 form because SARS can't process a negative amount.