Yes, with Conditions

• A single Digital Signature Certificate (DSC) can be used for multiple companies only if the holder is an authorized signatory in each of those companies.
  
• The DSC is linked to an individual’s identity, not a specific company.
  
• If a person is a director, partner, or authorized representative for multiple companies, the same DSC can be used across those entities.
  
• It must be accepted by each company’s records and registration portals.
  
• There should be no conflict in role or authorization across companies.
  

Restrictions Based on Purpose and Portal

• Some government portals may require DSC registration separately for each company.
  
• The DSC must be individually mapped to each company’s account on the portal.
  
• The PAN of the DSC holder must match the details provided during portal registration.
  
• Use must align with portal-specific compliance rules, such as GST, MCA, or EPFO.
  

Legal and Compliance Considerations

• Use of one DSC across companies is legal if used by the same person in authorized roles.
  
• Misuse of a DSC on behalf of a company without formal authorization is punishable.
  
• Organizations must maintain internal documentation authorizing such usage.
  
• It is important to avoid shared usage where others use the DSC without permission.
  

Best Practices for Multi-Company Use

• Ensure the DSC includes accurate, up-to-date identification details.
  
• Maintain written authorization for each company where the DSC is used.
  
• Register the DSC individually on portals like Income Tax, MCA, or GST for each company.
  
• Monitor usage to prevent unintentional or unauthorized actions.
  
• Revoke access if the person’s role changes in any company.
  

When Separate DSCs May Be Needed

• If roles differ significantly or if DSC is role-based rather than individual.
  
• When one company requires a specific organization-based DSC.
  
• If internal policy or portal guidelines restrict the use of one DSC across entities.
  
• When enhanced separation of duties and legal traceability is required.