Yes. The registration can be surrendered now at any time during a year if registered person's turnover is below than threshold limit and he expects/anticipates that his aggregate turnover will remain below threshold limit.. Pl. note the language of Section 22 of CGST Act. Registration is required to be taken, if his aggregate turnoverin a financial year exceeds twenty lakhs rupees.
In the pre-GST era, the words were, "in the preceding financial year". The basis of registration was aggregate turnover in the previous year. This is the major change in GST regime regarding obtaining registration.
Moreover, it is pertinent to point out that prior 23.1.18 only person registered voluntarily could not apply for cancellation of registration before the expiry of one year from the effective date of registration. That proviso to Rule 20 of CGST Rules, 2017 has been omitted vide Notification No. 3/18-CT dated 23.1.18
See para no.2 (iii) of the above of notification.
" (iii) in Rule 20, the proviso shall be omitted;"
From the above, it can be inferred that the condition of not allowing cancellation of registration in the year at any time existed for only for voluntarily registered and not for other than voluntarily registered..