Suo Motu Registration explained: this guide covers what it means, who it applies to, the step-by-step process, documents required, fees, due dates and penalties in India — so you can stay compliant with confidence and avoid costly mistakes.
Registration is normally an application. Rule 16 provides for the other case — where a survey, inspection, search, enquiry or any other proceeding finds a person liable to be registered but not registered.
Rule 16(1): where, pursuant to any survey, enquiry, inspection, search or any other proceeding, the proper officer finds that a person liable to registration has failed to apply, he may register the said person on a temporary basis and issue an order in FORM GST REG-12. Rule 16(2): the registration is effective from the date of such order. Rule 16(3): the person must either apply for registration in FORM GST REG-01 within ninety days of the order, or file an appeal against it. Rule 16(4): where the appeal is decided upholding liability, the person must apply within thirty days of the appellate order.
The sequence
1. A proceeding. Survey, inspection under s.67, search, enquiry, or any other proceeding.
2. A finding. That the person is liable to registration and has failed to apply.
3. REG-12. The officer registers the person on a temporary basis and issues the order. A temporary identification number is granted.
4. Ninety days. The person must either:
- apply in REG-01 — the ordinary application, processed under Rules 8 and 9; or
- appeal against the REG-12 order under s.107.
5. The GSTIN replaces the temporary number. Rule 16(5): the GSTIN granted pursuant to the application under sub-rule (3) or (4) shall be effective from the date of the order granting temporary registration.
The date that matters
Rule 16(2): the temporary registration is effective from the date of the order.
Rule 16(5): the eventual GSTIN is also effective from the date of the temporary registration order.
So the registration does not date back to the date on which liability actually arose. That is significant, because it separates two things:
The registration — from the REG-12 order date.
The liability — from the date liability actually arose, which the officer determines separately under s.63.
Section 63: assessment of unregistered persons
Registration and assessment run in parallel.
Section 63: notwithstanding anything to the contrary, where a taxable person fails to obtain registration even though liable to do so, or whose registration has been cancelled under s.29(2) but who was liable to pay tax, the proper officer may proceed to assess the tax liability of such taxable person to the best of his judgment for the relevant tax periods, and issue an assessment order within a period of five years from the date specified under s.44 for furnishing of the annual return for the financial year to which the tax not paid relates.
The proviso requires that no such assessment order shall be passed without giving the person an opportunity of being heard.
Rule 100(2): the proper officer shall issue a notice in FORM GST ASMT-14 containing the grounds on which the assessment is proposed, and after allowing a period of fifteen days, pass an order in FORM GST ASMT-15.
So a person found unregistered typically faces two documents: REG-12 for the registration, and ASMT-14 for the assessment of the earlier period.
The appeal route
Rule 16(3) expressly contemplates an appeal against the REG-12 order. The grounds would be that the person was not liable to register — below the threshold, within s.23, or not making taxable supplies at all.
Where the appeal succeeds, no registration follows. Where it fails, Rule 16(4) gives thirty days from the appellate order to apply.
Note that appealing does not stop the s.63 assessment, which proceeds on its own footing.
Practical notes
- Respond to REG-12 within ninety days, one way or the other. Doing nothing leaves a temporary registration with no returns and no GSTIN, and the s.63 assessment proceeds regardless.
- Assess the liability position honestly before choosing. Where liability plainly existed, applying in REG-01 and regularising is faster and cheaper than an appeal that will fail.
- The s.63 assessment is the larger exposure, and it is answered on the facts of turnover and taxability, not on the registration question.
- Section 18(1)(a) credit is not available — it requires an application within thirty days of becoming liable, which by definition did not happen.
- Rule 10A does not apply to a registration granted under Rule 16, so bank details are furnished with the REG-01 application in the ordinary way. Rule 10A →
- Keep the survey record. What the officer recorded on the day is the factual basis for both the REG-12 and the ASMT-14.
Key takeaways
- Rule 16: an officer may register a person temporarily in REG-12 where a proceeding finds them liable but unregistered.
- The temporary registration is effective from the date of the order, and so is the eventual GSTIN.
- Ninety days to apply in REG-01 or to appeal; thirty days from an adverse appellate order.
- Section 63 separately assesses the earlier period, to the best of judgment, within five years of the annual return due date.
- ASMT-14 notice with fifteen days to reply; order in ASMT-15.
- Section 18(1)(a) opening stock credit is lost, because the thirty-day application condition was not met.
Read next
- Assessment of Unregistered Persons: Section 63
- Rule 9: Seven Days, Thirty Days, and Deemed Approval
- Section 18(1): Claiming ITC on Stock When You Register
- Who Must Register: Threshold Limits and Exemptions
Disclaimer: Positions stated as on 5 September 2026, based on the CGST Act and Rules as amended to 31 March 2026 (ICAI Bare Law, 12th edition) and the ICAI Handbook on Registration under GST (November 2025).