In India’s GST system, assessment determines tax liability, scrutiny checks filed returns, an audit examines books and records, and an investigation is an enforcement inquiry. They are different processes, and a notice or information request is not, by itself, proof that tax is payable. What happens next depends on the legal provision, the issue raised, and the evidence the business provides.
How the four processes differ
“Assessment” is an umbrella term in the Central GST framework for statutory routes used to determine or finalize tax liability. It includes self-assessment and other routes, such as provisional assessment and assessments in specified cases. Return scrutiny and audit are separate processes that can reveal issues requiring further action. Investigation is an enforcement inquiry; it is not the same as a final decision that tax is due.
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| Process | Purpose and trigger | What a business may receive | Possible next step |
|---|---|---|---|
| Assessment | Determine or finalize liability through a route provided by the CGST Act. | Communications and orders vary by the statutory route; assessment does not correspond to one universal notice. | A liability may be finalized, or further action may follow if an issue remains. |
| Return scrutiny (section 61) | Check filed returns and related particulars against information available to the officer. | For a discrepancy, Form ASMT-10 may seek an explanation; the taxpayer ordinarily replies in ASMT-11. If the explanation or payment is accepted, the officer may close the matter in ASMT-12. | Closure, further proceedings under an applicable demand provision, or referral for audit or investigation. |
| Tax-authority audit (section 65) | Examine a registered person’s records, returns, and related tax matters. | Form ADT-01 may notify the audit; the process can include record verification and an opportunity to respond to discrepancies. Findings are communicated in ADT-02. | Findings may prompt separate demand proceedings under section 73, 74, or 74A, as applicable. |
| Special audit (section 66) | Have records audited by a specified chartered accountant or cost accountant when the statutory process is invoked. | A direction may be issued in ADT-03, with findings in ADT-04. | Findings may inform subsequent tax action. |
| Investigation or enforcement inquiry | Inquire into suspected non-compliance and establish relevant facts under the Act. | Specific information requests or summons may be issued; inspection, search, or seizure may occur only where the legal conditions are met. | The inquiry may close without further action or lead to a separate show-cause, demand, or other lawful process. |
The forms and procedures shown here are described in the CGST Rules and related CBIC materials. The correct route and current requirements depend on the communication and the applicable Central, State, or Union Territory authority.
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Scrutiny under section 61 focuses on returns and related particulars. An officer may identify a mismatch or other discrepancy and ask the taxpayer to explain it. The point of the first notice is to obtain a response; it is not automatically a demand order.
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- Read Form ASMT-10 closely. Identify each discrepancy, the tax period and figures involved, and the response deadline and channel specified in the notice.
- Reconcile the issue. Compare the return entry with relevant ledgers, invoices, payment records, and other supporting material. Explain the calculation or factual basis for each response point.
- Reply in the prescribed manner. The Rules provide for a response in ASMT-11. If the discrepancy is accepted and payment is made, report and document that as directed.
- Track the outcome. If the officer accepts the explanation or payment, the matter may be closed through ASMT-12. If not, it may move to a separate proceeding or another route permitted by law.
The exact response period and procedural requirements should be taken from the notice and current rules; there is no single deadline for every GST communication.
What to expect from a section 65 audit
A tax-authority audit is an examination of records and tax treatment, not simply another name for a return mismatch. Under section 65, an authorized officer may audit a registered person for a period, at a frequency and in a manner prescribed by law. The audit may take place at the business premises or in the tax office.
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Notice and timing
- The registered person must be informed at least 15 working days before the audit.
- The ordinary completion period is three months from commencement. The Commissioner may extend it by up to a further six months if satisfied that it cannot be completed within three months, recording reasons in writing.
- For this timing rule, commencement is when the called-for records are made available or when the audit actually begins at the business premises, whichever is later.
Records and findings
The officer may verify source documents for books and returns, turnover, exemptions and deductions, tax rates, input tax credit (ITC) availed or used, refunds, and other relevant matters. The Rules contemplate that discrepancies may be communicated, the taxpayer may reply, and the officer considers that reply before finalizing findings. Within 30 days after the audit concludes, the officer must inform the taxpayer of the findings, rights and obligations, and reasons.
For the business, practical preparation means arranging the underlying records and being able to reconcile reported figures to their supporting documents. Keep a copy of what is supplied and when. An audit finding is not itself the same as a demand order: if a tax or ITC issue is identified, separate proceedings may follow under the applicable provision.
What an investigation may involve
An investigation is an enforcement inquiry into suspected non-compliance. It can involve targeted requests for information or summons. More intrusive powers are governed by statutory conditions: section 67 provides for inspection in specified circumstances, including where an officer of at least Joint Commissioner rank has reasons to believe that a taxable person has suppressed a supply or stock transaction, claimed excess ITC, or contravened the Act or Rules to evade tax. The section also addresses search and seizure, including seizure of records in defined circumstances. These powers are not an unrestricted authority to search or seize in every inquiry.
CBIC guidance on covered CGST investigations
CBIC Instruction No. 01/2023-24-GST (Inv.), dated 30 March 2024, sets out administrative directions for CGST field formations investigating regular taxpayers. It calls for approval before initiating an investigation in the ordinary case, with prior written approval from the zonal Principal Chief Commissioner for certain sensitive categories. It also directs officers to check whether another office is already investigating the same subject, make information requests and summons specific, avoid “fishing” inquiries, and ordinarily avoid seeking information already available digitally on the GST portal. The instruction calls for reasoned approval of summons and recording why the requested material is relevant.
The instruction is guidance to the covered CGST formations; it should not be treated as an exhaustive statement of statutory rights or administrative practice for every State GST administration. It states: “An investigation initiated must reach the earliest conclusion which is not more than one year.” That is a direction in the instruction to the relevant field formations, not a general statutory limitation period applying to every GST proceeding.
How to respond when a GST communication arrives
- Identify exactly what arrived. Read the complete notice or letter, not just a portal summary. Note the issuing authority, GSTIN, tax period, statutory section or rule, form number, issue raised, records requested, reply route, and stated deadline.
- Verify and preserve it. Check authenticity through the official GST system or the issuing office’s official contact channel. Retain the notice and service details, along with earlier related correspondence.
- Preserve the relevant evidence. Secure the filed returns, ledgers, invoices, contracts, e-way bills, payment records, ITC support, reconciliations, and other material for the periods and issues named. Keep an indexed copy of what you provide and when.
- Answer the question actually asked. Match each point in the communication to a clear explanation and supporting documents. For a scrutiny notice, use the prescribed response process; for an audit, organize records so reported values and tax treatment can be reconciled; for an investigation request, understand the stated subject and legal basis before responding.
- Get case-specific advice when exposure is material. If the matter involves significant tax, penalty, search or seizure, or prosecution exposure, consult a qualified GST practitioner or tax lawyer familiar with the relevant authority and facts.
Scrutiny, audit, summons, demand notices, and other communications do not share one universal reply deadline. Follow the rule and deadline applicable to the actual notice, and check the current consolidated legislation, rules, notifications, and corresponding State or Union Territory provisions.
Current-law qualification
This overview concerns India’s Central GST framework as reviewed on 7 October 2026. The CGST Act and Rules are amended over time, and corresponding State or Union Territory legislation and administrative practice may matter in a specific case. CBIC describes its archive-style Rules page as informational; the notice, current consolidated law, relevant notifications, and issuing authority should govern any action. The section 65 provisions include the newer section 74A in the relevant demand framework, so older commentary may use an outdated section map.
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