'S&T' is an abbreviation for Subsistence and Travel. Where an employee is required to travel for business purposes and the travel is out of the town. The employer normally gives the employee a daily out-of-town allowance which is meant to be used for travel, food and accommodation costs.
S&T Allowances are shown on your certificate as other allowances - and this can found here:
TaxTim will help you:
Do Your Tax Return Easily
Tim uses your answers to complete your income
tax return instantly and professionally, with
everything filled in in the right place.