24. Taxpayer reference number
(1) SARS may allocate a taxpayer reference number in respect of one or more taxes to each person registered under a tax Act or this Chapter.
(2) SARS may register and allocate a taxpayer reference number to a person who is not registered.
(3) A person who has been allocated a taxpayer reference number by SARS must include the relevant reference number in all returns or other documents submitted to SARS.
(4) SARS may regard a return or other document submitted by a person to be invalid if it does not contain the reference number referred to in subsection (3) and must inform the person accordingly if practical.