If the sales made by your company formation exceeds the VAT limit, then you must register. There are fines and penalties available to HM Customs and Excise should a registration application not be made at the correct time.
The rules regarding mandatory registration state that:
* If sales which your company has made in any twelve month period exceed £79,000
* If you anticipate that sales made by your company will be more than £79,000 in the next month.
Completion of the form VAT 1 is the primary mechanism most companies use to register. On reaching the threshold the completed and signed form must be returned to Customs and Excise. They should receive it within a month or penalties could be imposed