VAT registration is compulsory if any of the following apply:
Taxable turnover for VAT purposes in the previous 12 months exceeds the threshold.
VAT taxable turnover may go over the threshold in the next 30 days alone.
When a VAT-registered business is taken over as a going concern.
If the VAT taxable turnover for the year is less than or equal to the deregistration threshold or it is expected to fall below it in the next 12 months, a business has the option of deregistering if it wants to.