Is tax deducted before are after pension deductions?

If my salary is R15000 pm and my pension contribution is 7. 5 % of my salary, do I tax the R15000 as the gross earnings or do I first deduct the 7. 5% pension from the gross salary before calculating the tax?

You would first deduct the 7.5%. You can make use of our SARS income tax calculator to work out what the tax should be.