The Short Answer
Under Section 116 of the CGST Act, a company can be represented before a GST officer, the Appellate Authority or the Appellate Tribunal by any of the following:
- a relative or regular employee of the company
- an advocate entitled to practise in any court in India, not debarred
- a chartered accountant, cost accountant or company secretary holding a valid certificate of practice
- a registered GST practitioner enrolled under Rule 83
- certain retired officers of the tax department, subject to conditions
Authorisation must be in writing. The only situation where nobody can stand in for you is where a person is required to appear personally for examination on oath, which arises during investigation rather than adjudication.
That is the legal answer. It is also the least useful one, because eligibility and competence are different questions.
What "Handling" a Notice Actually Involves
Most companies think of a show cause notice as a filing task. It is not. A reply to a GST notice is your first pleading, and the adjudication order, the appeal, the Tribunal and any writ will all be built on what it said and what it left out.
Doing it properly means five distinct pieces of work, and very few individuals cover all five.
Threshold checks on the notice itself. Is there a DIN? Does the officer have jurisdiction, both administratively and on monetary limits? Has the counterpart administration already started proceedings on the same subject matter? Is the notice within time? Each of these can defeat a notice before its merits are reached, and each needs someone who knows to look. Our 15-point checklist for replying to a GST show cause notice sets out the full sequence.
Rebuilding the numbers. Data-driven notices are riddled with duplication across years, gross figures used instead of net, ITC already reversed, tax already paid, and wrong-head payments treated as non-payment. This is accounting work, and it is where the majority of demands actually shrink. The pattern is described in our note on resolving inflated GST tax demands.
Testing the charging section. A fully disclosed interpretational issue dressed up as suppression is a mismatch that can defeat the notice on its own, as we explain in Section 73 versus Section 74. For periods from FY 2024-25, both are replaced by the unified provision covered in our guide to Section 74A of the CGST Act.
Drafting the reply like an appeal memo. Preliminary objections without prejudice to merits, facts with a document map, issue-wise legal submissions, without-prejudice quantification, an express request for a personal hearing, indexed annexures.
Appearing and following through. Attending the hearing, tendering written submissions, then testing the final order against the notice. New grounds or higher amounts appearing for the first time in the order are bad in law, and natural justice in GST adjudication is one of the most productive lines of attack available.
Who Fits Which Notice
- Routine mismatch, small amount, clear documents: In-house finance team, with a CA reviewing the reply before filing
- ITC denial, supplier default, classification dispute: A CA firm with GST litigation experience
- Suppression or fraud alleged under Section 74 / 74A: A CA firm leading, with counsel advising on the legal grounds
- Jurisdiction, limitation or denial of hearing is the main issue: Counsel, with your CA assembling the record
- Anything heading to the High Court: An advocate. A CA cannot appear there
- Summons or investigation running alongside: Both, and the summoned person attends personally
Can Your In-House Team Handle It?
Sometimes, and there is no reason to outsource a simple GSTR-1 versus GSTR-3B mismatch with clean documents.
But be honest about three limits. Your team is answering a notice about its own filings, which makes objectivity hard. It has no experience of how a particular officer or appellate authority reasons. And it will not instinctively frame the reply for a forum three years away.
The practical arrangement that works well: your team assembles the reconciliation and the documents, an external firm frames the objections and drafts the reply. That splits the work along the line where each side is genuinely stronger.
What to Ask Before You Appoint Anyone
Five questions, and the answers tell you most of what you need.
- Have you appeared before the GST Appellate Authority and the GSTAT? Drafting and appearing are different skills. Ask for specifics, not assurances. Our guide to appeals before the GSTAT sets out what that forum now involves.
- Will you check limitation before anything else? If they go straight to the merits without asking when the notice was issued and for which period, that is a warning sign. See the GST limitation period.
- Who actually drafts, and who attends the hearing? In many firms these are different people, and the second one has not read the file.
- What is your view on the pre-deposit and appeal cost if this goes against us? Someone who cannot price the whole path is only solving today's problem.
- When would you tell us to pay rather than fight? An adviser who has never given that advice will not give it to you either.
Three Ways Companies Get This Wrong
Treating it as a compliance task. The person who files your returns is not automatically the person who should draft your defence. Those are different jobs.
Appointing late. Bringing someone in a week before the reply date wastes the time needed to reconstruct records and test jurisdiction. The best defences are built before the reply, not after the order.
Leaving authorisation loose. Authorisation must be in writing, and orders served only on an unauthorised representative have been held not to be good service. Keep the letter of authority current and keep the company's own registered email and address live, so nothing arrives that only your consultant sees.
Where It Goes From Here
If the order goes against you, the path is a first appeal in Form APL-01 within three months, then the Tribunal. The sequence is set out in our guides to GST adjudication and its time limits, the GST appeal procedure, and, where the defect is fundamental rather than factual, writ versus appeal in tax litigation.
Choosing the right person at the notice stage is what keeps all of those routes open.