Deregistering for VAT is something you have to consider very carefully. Obviously, it will cut back on your bookkeeping costs of you don't have to pay your accountant to calculate and submit your VAT every two months, but some of the larger suplliers in various industries expect you to be registered for VAT.

The best advice would be to make an appointment with your accountant and discuss this in detail, the best person to give advice would be the one that handles your financials.

Something else: if you are not registered for VAT, you can't claim back the VAT you have paid on your purchases, however, if you run your business at a profit, you will always pay over VAT and thus merely staying registered so that you can claim your input VAT is not a good choice.

Eg. Your input VAT on your stock is R100 that you can claim from SARS. This is the amount you will lose should you deregister. However, if you sell that stock with a markup, you output VAT is R200. So you still have to pay over R100 to SARS, after already having paid the original R100 when you purchased the stock. So, if you stay registered for VAT this transaction will cost you R200 in VAT, while if you deregister, the transaction will only cost you R100 in VAT.

Obviously, there are exceptions to this rule, so rather meet with your accountant.