You will receive a Completion Letter if all goes well and SARS is happy with your documents. This means that SARS is not adjusting your Original Assessment and if you have a refund due, it should be paid out in 7 working days (provided you have no tax debt due or outstanding tax returns from prior years). Similarly, if you owe tax to SARS per your Original Assessment, the amount you owe will remain unchanged.
An example of a Completion Letter is below:
VERIFICATION OF ASSESSMENT
We refer to the verification of your assessment for the 2018 tax period. Please note that no adjustment has been made to this assessment. However, in terms of the Tax Administration Act the South African Revenue Service reserves the right to conduct further reviews in future if required.
Should you have any queries please call the SARS Contact Centre on 0800 00 SARS (7277). Remember to have your ID number or income tax number at hand when you call to enable us to assist you promptly.