File the pending returns first
If your registration was cancelled for non-filing, you must first file all the outstanding returns and pay the tax, interest and late fees. Revocation is not granted while returns remain pending — clearing them is the substance of the application.
The application
You then file Form GST REG-21 on the portal, generally within 90 days of the cancellation order (extendable in some cases). The officer reviews it and, if satisfied, restores the registration via REG-22; if not, issues a notice for your reply. Confirm the current time limit, which has been amended.
A worked example
Example: your GSTIN was cancelled in March for six months of non-filing. You file the six returns with late fees, pay the dues, then submit REG-21 within 90 days. The officer restores the registration, and you continue on the same GSTIN — preserving your ITC chain and history. Miss the window and you may have to re-register fresh. Our team can complete the filings and revocation.