What is the Validity of Letter of Authorisation for GST?

GST compliance is dependent on the correct authorisation of representatives dealing with filing, replies, and proceedings. A Letter of Authorisation for GST is done to give a special permission from the taxpayer that allows another person to take action on its behalf in front of the tax department. This document has the force of law and impacts on how notice is served and reply accepted and responsibility fixed. 

Businesses often get confused about the validity of its validity, when it needs renewal and its practical limits. This article is used to explain the legal purpose, duration and correct use of this authorisation. It is written for Indian businesses, accountants and GST practitioners for clarity when it comes to compliance, audits, and departmental interactions without undergoing procedural lapses.

Meaning of Letter of Authorisation for GST

A Letter of Authorization for GST is a written-given permission by a registered taxpayer under GST to appoint a representative. It enables the authorised person to take action before taking the GST authorities in Section 116 of the CGST Act. The CGST Act allows representation by:

• A relative or employee

• A Chartered Accountant or Cost Accountant

• A Company Secretary

• A GST Practitioner

The authorisation confirms the fact that the actions carried out by the representative are legally binding on the taxpayer. 

Why a Letter of Authorisation for GST is required?

The letter of authorisation for Letter of Authorisation for GST law does not admit informal representation. By the absence of valid authorisation:

• Replies may be rejected

• Hearings may be postponed

• Submissions can be treated as invalid

Common Practical Reasons

• Receiving and responding to paying GST notices.

• Filing applications or replies while scrutinising.

• Representing the business in audits.

• Appear before adjudication proceedings.

This comes into play more as the departmental scrutiny becomes more acute in 2026.

Who can issue & who can receive it?

The issuer has to be a registered person or a legally empowered signatory.

• Proprietors

• Partners

• Directors

Authorised signatories present under GST portal.

• Internal accountants

• External tax consultants

• GST practitioners

• Litigation rate of law and breakdown

Indian proprietorships often authorise local accountants to deal with filings made using accounting software and company’s GST practitioners are appointed for hearings.

Validity period of Letter of Authorisation for GST

GST law doesn’t provide the time duration of expiry. The validity is intent, continuity and circumstance-based.

• Valid until revoked

• Valid for a certain proceeding, if stated

• Valid as long as organisational structure is not changed

In practice, officers accept the authorisation unless there is a reason for doubting its relevance.

Is Expiry Defined or Implied

Expiry Implied, not automatic. Situations in which validity may be concluding are:

• Withdrawal by the taxpayer

• Completion of a particular case

• Change in constitution of business

For example, the earlier authorisations lose their relevance if a partnership firm is converted into a private limited company. Such transition is expected to rise in 2026 with the Letter of Authorisation for GST, because of restructuring among MSMEs. Renewal is not annual but on a per event basis. Cases where new authorisation is required.

When Renewal Becomes Necessary?

• Change in authorised signatory.

• Appointment of a new consultant.

• Change from individual to firm representation.

• New litigation or appeal.

Companies utilising GST billing software for purposes that are frequently given new authorisations to update the internal controls.

Impact of Organisational Changes

Structural changes have an impact on legal authority. Examples include:

• Proprietorship to convert to LLP
  
• Partner retirement or induction

• Director resignation

• Merger or demerger

In such cases, sustenance of an old authorisation can produce compliance risk. In the process of internal system upgrades using MargBooks software, many businesses modify their authorisation records as well to prevent mismatching during audits.

Practical Usage During Audits, Filings, & Litigation

Demanding of the Letter of Authorisation for GST is regularly demanded during:

• GST audits

• Departmental summons

• Appeal filings

• Personal hearings

• A trader authorising CA to reply to DRC-01 in Surat.

• A manufacturing company appointing a GST practitioner in case of appellate hearing

• An MSME leaving the handling of a notice to its consultant during visits of the officers

Digital record keeping through MargBooks software for keeping authorisation copies for quick submission. Tax authorities are imposing greater checks on procedures. 

Compliance Expectations in Upcoming Years

• Check authorisation before accepting replies

• Demand freshers after business changes

• Question outmoded signatories

Businesses making use of structured platforms such as MargBooks software is in a better position when it comes to matching documentation using portal records. Proactive authorisation review of site authorisations will help minimise hearing delays and adverse orders.

Best Practices for Businesses & Professionals

• Issue an authorisation on letterhead.

• Mention clearly scope and duration.

• Signed by registered signatory.

• Keep soft and hard copies

• After structural changes, update it.

These steps for protecting taxpayer and representative.

Conclusion

The Letter of Authorisation for GST plays a Silent but decisive role in the daily compliance, audit and litigation. Its validity is dependent on business continuity, authority of the issuer and relevance to the proceeding. There is no specific expiry, but where there is a change in structure, representation or intent, a renewal is necessary. 

As compliance scrutiny rises in the year 2026 with MargBooks software, businesses must treat authorisation as a living document and not a one-off formality. Regular review is important to ensure that the notices are handled correctly and submissions have force of law. Clear authorisation avoids the contentions relating to representation while preserving the procedural rights of Indian taxpayers across industries.