That "tax/VAT" number part troubles me. For clarity, they are two different registrations with SARS and with definitely different numbers.
You had better get absolute clarity about whether the new company was actually registered for VAT. It normally involves some fairly onerous submissions and is not automatic.
If you are VAT registered, you must charge VAT on taxable supplies. If you are not VAT registered, you may not charge VAT on taxable supplies.
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