Is DSC Mandatory for GST?
Whether a DSC is mandatory for GST depends on the type of entity and the nature of the filing. Here is a clear breakdown:
| Entity Type | DSC Mandatory? | Alternative Allowed? |
|---|---|---|
| Public Limited Company | ✓ Yes — DSC mandatory | No |
| Private Limited Company | ✓ Yes — DSC mandatory | No |
| LLP (Limited Liability Partnership) | ✓ Yes — DSC mandatory | No |
| Foreign Company | ✓ Yes — DSC mandatory | No |
| Proprietorship / Individual | Optional | EVC / Aadhaar OTP allowed |
| Partnership Firm | Optional | EVC / Aadhaar OTP allowed |
| Trust / Society | Optional | EVC / Aadhaar OTP allowed |
Key rule: All companies and LLPs must use a DSC to sign their GST returns. OTP-based e-verification (EVC) is only available for proprietorships, individuals, and partnership firms.
Which DSC Type is Required for GST?
For GST filings, a Class 3 Signing DSC is sufficient. You do not need a Combo DSC (Sign + Encrypt) for the GST portal alone. The DSC used for GST must be in the name of the authorised signatory — typically a director, proprietor, partner, or designated signatory as per the GST registration.
GST Returns That Require DSC Signing
When filing using DSC, the following returns on the GST portal need to be signed:
- GSTR-1 — Outward supplies return (monthly/quarterly)
- GSTR-3B — Monthly summary return
- GSTR-9 — Annual return
- GSTR-9C — Reconciliation statement (audit)
- GST registration applications (new registration, amendments)
- Refund applications
- Appeal applications on the GST portal
How to Register Your DSC on the GST Portal
Before using a DSC on the GST portal, it must be registered once. Here's how:
- Log in to the GST portal (gst.gov.in) with your GSTIN and password.
- Go to My Profile → Register / Update DSC.
- Select the certificate from the token (ensure the token is plugged in and drivers are installed).
- Enter the token PIN and click Register.
- The DSC is now registered and can be used for signing returns.
Common issue: If the DSC is not appearing on the GST portal, ensure you are using Internet Explorer or the GSC plugin on Chrome/Edge, and that the DSC driver is installed correctly. JS & Co. provides free troubleshooting support for this.
DSC for New GST Registration
When applying for a new GST registration, companies and LLPs must sign the registration application using a DSC. The DSC must belong to the authorised signatory mentioned in the application (typically a director or designated partner).
Proprietors can use Aadhaar OTP (EVC) to sign the registration application if their Aadhaar mobile number is linked and active.
What Happens If You File Without DSC (for Companies)?
Companies that try to file GST returns without a DSC will face an error on the portal — the submission will not go through. This can result in late filing penalties (₹50–₹200 per day) if the return is not filed on time. It is important to have a valid DSC before the filing due date.