1. Why Section 61 matters
Searches such as “Section 61 CGST Act”, “GST scrutiny notice”, “ASMT-10 notice”, “ASMT-11 reply”, “ASMT-12”, “GST return scrutiny”, “GSTR-3B scrutiny” and “GST mismatch notice” all relate directly to this provision.
Section 59 places the initial responsibility on the taxpayer to self-assess GST. Section 61 gives the proper officer a separate mechanism to check that self-assessment by scrutinising the return and related particulars.
2. Section 61 in very simple language
Suppose a company reports ₹1 crore of taxable sales in GSTR-1 but only ₹80 lakh in GSTR-3B.
The GST officer may notice the difference from information available to the department. Section 61 allows the officer to scrutinise the return and ask the taxpayer to explain the discrepancy.
or → further departmental action if unresolved
This is the basic working of GST scrutiny.
3. What is scrutiny of returns?
Scrutiny is a return-level verification. The officer examines the return and related information available to the department to see whether the figures appear correct.
| Scrutiny generally asks | Example |
|---|---|
| Do different GST returns agree? | GSTR-1 vs GSTR-3B mismatch. |
| Does ITC appear reasonable? | Large ITC compared with GSTR-2B or previous periods. |
| Are tax payments consistent? | Reported liability compared with payment/ledger data. |
| Are outward supplies consistent with other data? | E-way bill or other available information. |
| Are unusual changes visible? | Sudden fall in turnover with continued high ITC. |
Scrutiny is not automatically a finding of tax evasion. A discrepancy may have a perfectly valid explanation.
4. What can the officer compare?
Section 61 refers to the return and related particulars. CBIC's scrutiny instructions explain that information available from returns and statements and sources such as GSTN, e-way bill systems and other departmental data may be used for risk-based scrutiny. citeturn0search23
Outward supplies and related documents.
Summary liability and ITC.
Inward-supply/ITC information.
Movement-related information.
Trends and unusual changes.
Information legally available to the department.
5. Statutory structure
| Sub-section | Easy meaning |
|---|---|
| 61(1) | Proper officer may scrutinise the return and related particulars, identify discrepancies and seek explanation. |
| 61(2) | If the explanation is acceptable, the taxpayer is informed and no further action is taken under that scrutiny. |
| 61(3) | If the explanation is not satisfactory, or accepted discrepancy is not corrected, the officer may take further action under the specified provisions. |
The current framework includes reference to Section 74A for the newer tax-period determination framework. citeturn0search0
6. Selection for scrutiny
Not every return is manually examined in the same way. Returns can be selected for scrutiny based on risk parameters and information available to the department.
CBIC Instruction No. 02/2022-GST describes scrutiny as a risk-based process and refers to information from GSTN, DGARM, ADVAIT, e-way bill systems and other available sources. citeturn0search23
7. ASMT-10 notice
When a discrepancy is noticed during scrutiny, Rule 99 provides for a notice in FORM GST ASMT-10.
The notice should communicate the discrepancy and seek the registered person's explanation. Where possible, it also quantifies the tax, interest and other amount connected with the discrepancy. citeturn0search1turn0search19
| When you receive ASMT-10 | What to do |
|---|---|
| Read each discrepancy separately | Do not answer only with a general statement. |
| Check tax period | Reconcile the exact period mentioned. |
| Check figures | Match the officer's figures with books/returns. |
| Identify cause | Determine whether it is a timing, classification, reporting or genuine tax issue. |
| Prepare evidence | Attach reconciliations and supporting records. |
8. Reply period
Section 61(3) provides that if no satisfactory explanation is furnished within 30 days of being informed by the proper officer, or within such further period as may be permitted, further action may be initiated.
Rule 99 requires the ASMT-10 notice to specify the response period. There are older CBIC web pages carrying a 15-day wording in Rule 99; however, the current statutory/rule text reflected in later compilations provides the 30-day framework. The article therefore follows the current statutory wording rather than relying on the stale webpage wording. citeturn0search1turn0search0
9. ASMT-11 reply
The taxpayer responds to ASMT-10 in FORM GST ASMT-11.
There are two broad situations:
Accept discrepancy
Pay the applicable tax, interest and other amount and inform the officer.
Explain discrepancy
Provide the factual and legal explanation with reconciliation and supporting documents.
Rule 99 expressly provides for ASMT-11 for the taxpayer's payment/intimation or explanation. citeturn0search1
10. Accepting the discrepancy
If the taxpayer agrees that the discrepancy is genuine, it should calculate the correct liability carefully rather than simply paying the figure typed in the notice without verification.
The working should identify:
- tax amount;
- interest;
- late fee/other amount, if applicable;
- tax period;
- reason for the original error; and
- return/payment mechanism used to correct it.
11. Explaining a discrepancy
A good explanation should answer four questions:
- What difference did the officer identify?
- Why does the difference exist?
- What records prove the explanation?
- Does any tax actually remain payable?
For example, a GSTR-1/GSTR-3B mismatch may arise because a credit note was reported in one return in a different period, because an amendment was made, or because a genuine reporting error occurred.
12. ASMT-12 closure
Where the explanation or information furnished by the taxpayer is found acceptable, Rule 99 provides for communication in FORM GST ASMT-12.
In simple terms, ASMT-12 means the scrutiny issue has been accepted/closed at that stage.
It is important to understand the wording: closure of scrutiny under Section 61 does not create immunity from every other statutory proceeding based on separate information or a different legal provision.
13. What if explanation is not satisfactory?
Section 61(3) permits the proper officer to initiate appropriate action if:
- no satisfactory explanation is furnished within the permitted period; or
- the taxpayer accepts the discrepancy but fails to take the corrective measure in the relevant return.
The possible action includes proceedings under Sections 65, 66 or 67, or determination of tax and other dues under the applicable provisions, including Sections 73, 74 and the current Section 74A framework where applicable. citeturn0search3turn0search0
14. Section 65 audit
If scrutiny identifies issues requiring a broader examination, the department may consider audit under Section 65, subject to the statutory conditions.
An audit is more extensive than a simple return scrutiny because the officer examines books, records and other relevant documents for the selected period.
Rule 101 provides the audit procedure and FORM GST ADT-01 for the audit notice. citeturn0search20
15. Section 66 special audit
Section 66 deals with special audit where, at the relevant stage, an officer not below the rank of Assistant Commissioner considers the nature and complexity of the case and the interest of revenue and forms the statutory opinion that the value has not been correctly declared or credit is not within normal limits.
With prior approval of the Commissioner, the registered person can be directed to have specified records examined and audited by a nominated Chartered Accountant or Cost Accountant.
This is a separate and more specialised mechanism; an ASMT-10 scrutiny notice does not automatically mean a special audit will follow.
16. Section 67 inspection/search
Section 67 contains inspection, search and seizure powers in specified circumstances. These powers are materially different from ordinary return scrutiny.
Therefore, a taxpayer should not treat an ASMT-10 notice as equivalent to a search or investigation proceeding.
17. Tax determination under Sections 73/74/74A
If scrutiny does not resolve a discrepancy, the officer may move into a tax-determination proceeding under the applicable statutory provision.
| Provision | Broad role |
|---|---|
| Section 73 | Historically dealt with tax not paid/short paid or erroneous refund/ITC cases not involving fraud, wilful misstatement or suppression; its application is period-sensitive under the amended framework. |
| Section 74 | Fraud, wilful misstatement or suppression framework for the periods to which it applies. |
| Section 74A | Current newer-period common tax-determination framework introduced by the Finance (No. 2) Act, 2024. |
The precise determination provision depends on the tax period and applicable law. Section 61 is the scrutiny gateway; it should not be confused with the final determination provision.
18. GSTR-1 vs GSTR-3B scrutiny
This is one of the most common practical scrutiny areas.
| GSTR-1 | GSTR-3B | Possible reason for difference |
|---|---|---|
| ₹1.00 crore | ₹80 lakh | Timing difference, amendment, credit note, omission or genuine error. |
| ₹80 lakh | ₹1.00 crore | Could involve earlier-period reporting, classification or other adjustment. |
Never assume that every difference is a tax shortfall. First prepare a transaction-level reconciliation and identify the reason.
19. GSTR-2B and ITC scrutiny
ITC can be scrutinised through comparisons between GSTR-3B, GSTR-2B and other available information.
Common questions include:
- Why is ITC higher than the corresponding supplier-reported amount?
- Were credit notes considered?
- Was blocked ITC claimed?
- Were Rule 42/43 reversals made?
- Was Rule 37/37A treatment applied where relevant?
- Was reverse-charge ITC separately handled?
- Were imports/ISD credits correctly considered?
The taxpayer should respond with an invoice-level reconciliation rather than merely stating that the ITC is “correct”.
20. RCM scrutiny
Reverse-charge liabilities are another area where scrutiny can identify differences.
For example, an expense ledger may show legal, transportation, sponsorship or other transactions that require separate RCM analysis. The scrutiny response should show the relevant transaction, legal treatment, tax calculation, payment and ITC treatment.
21. E-way bill and other data
Departmental scrutiny can use information available from other GST systems. CBIC's scrutiny instruction specifically discusses use of data sources including GSTN, DGARM, ADVAIT and the e-way bill portal. citeturn0search23
Therefore, a business should maintain consistency between:
A difference does not automatically prove tax evasion, but unexplained differences increase compliance risk.
22. How to read an ASMT-10
When an ASMT-10 arrives, do not start by writing a long legal reply. First convert the notice into a working sheet.
| Column | What to capture |
|---|---|
| Sl. No. | Notice discrepancy number. |
| Officer's observation | Exact issue identified. |
| Tax period | Month/quarter/FY involved. |
| Officer's amount | Tax/interest/other amount mentioned. |
| Books figure | Actual accounting figure. |
| GST return figure | Reported amount. |
| Difference | Calculated mismatch. |
| Reason | Timing/classification/error/other explanation. |
| Evidence | Invoice, ledger, return, reconciliation etc. |
| Final conclusion | Pay or explain. |
23. How to prepare a professional response
A strong ASMT-11 response should be:
- Point-wise: answer every discrepancy separately.
- Numerical: show figures and reconciliation.
- Documented: identify supporting records.
- Period-specific: explain the exact tax period.
- Legally reasoned: cite the relevant GST provision where necessary.
- Honest: do not defend an error as correct merely to avoid payment.
24. Detailed practical examples
Example 1 — GSTR-1 higher than GSTR-3B
GSTR-1 shows ₹1 crore while GSTR-3B shows ₹80 lakh. The company reconciles the ₹20 lakh difference and identifies ₹12 lakh as a credit-note/timing adjustment and ₹8 lakh as a genuine reporting error. The response should explain both separately.
Example 2 — ITC higher than GSTR-2B
GSTR-3B claims ₹50 lakh ITC while GSTR-2B supports ₹45 lakh. The taxpayer should reconcile the ₹5 lakh difference by invoice and explain legitimate timing/import/ISD/other differences rather than simply saying “ITC is correct”.
Example 3 — Accepted tax discrepancy
The officer identifies ₹2 lakh short-paid tax and the taxpayer confirms the calculation. The taxpayer should pay the applicable tax and interest and report the corrective action as required.
Example 4 — Timing difference
An invoice appears in GSTR-1 in one period and the corresponding tax treatment appears in GSTR-3B in another. The taxpayer should provide invoice-level evidence and explain the reporting sequence.
Example 5 — Credit note mismatch
The officer sees a difference caused by credit notes. The taxpayer provides original invoice, credit note, return reporting and accounting entries.
Example 6 — RCM omission
Scrutiny identifies an expense covered by RCM. The company verifies the legal position, calculates tax/interest, pays the amount and explains the corrective action.
Example 7 — E-way bill turnover difference
E-way bill data appears higher than reported outward supplies. The company identifies stock transfers, cancelled documents, exempt movement and actual taxable supplies before responding.
Example 8 — Previous-period amendment
A return comparison shows a difference because an earlier-period invoice was amended in a later return. The response should show the original and amended reporting trail.
Example 9 — No tax impact
A classification difference changes the presentation between tables but does not change total tax. The taxpayer should prove the no-tax-impact position with reconciliation.
Example 10 — Unsatisfactory explanation
If the taxpayer cannot substantiate the discrepancy and tax remains unpaid, the officer may proceed under the applicable statutory provisions after scrutiny.
25. Construction and infrastructure examples
RA bill reconciliation
For contractors, an ASMT-10 may involve differences between revenue recorded in books, RA bills, tax invoices, GSTR-1 and GSTR-3B. A project-wise reconciliation can explain timing differences.
Mobilisation advances
Advances should be separately tracked because their GST treatment can differ from final invoice reporting depending on the applicable time-of-supply provisions.
Retention money
The taxpayer should maintain contract clauses, RA bills, invoices and accounting treatment to explain timing differences involving retention amounts.
Subcontractor ITC
A construction company should reconcile subcontractor ITC with GSTR-2B, payment conditions, credit notes and blocked/restricted credit provisions before responding to an ITC discrepancy.
26. Documents to keep ready
- GSTR-1 and GSTR-3B copies;
- GSTR-2B reconciliation;
- sales and purchase registers;
- tax invoices and credit/debit notes;
- e-way bills where relevant;
- electronic liability, cash and credit ledger;
- RCM workings;
- ITC reversal workings;
- bank/payment records where relevant;
- contracts and agreements;
- project-wise reconciliations;
- prior-period amendment records; and
- working papers supporting the ASMT-11 response.
27. Internal controls
| Control | Purpose |
|---|---|
| Monthly GSTR-1/GSTR-3B reconciliation | Detect outward-supply differences before scrutiny. |
| GSTR-2B reconciliation | Support ITC accuracy. |
| RCM register | Prevent reverse-charge omissions. |
| E-way bill reconciliation | Identify movement/turnover differences. |
| Credit/debit note register | Track adjustments across returns. |
| ASMT notice tracker | Ensure timely responses. |
| Evidence index | Make departmental responses easier to review. |
| Second-level review | Prevent unsupported admissions or incorrect explanations. |
28. Legislative development
| Period | Development |
|---|---|
| 2017 | Section 61 came into force with the GST assessment and scrutiny framework. |
| 2017 | Rule 99 established the ASMT-10, ASMT-11 and ASMT-12 scrutiny process. |
| 2022 | CBIC issued Instruction No. 02/2022-GST providing detailed guidelines for scrutiny of returns and risk-based selection. |
| 2024 onward | Section 61 and the scrutiny framework now need to be read with the newer Section 74A determination framework for the tax periods to which it applies. |
| Current | Scrutiny remains a return-level verification mechanism, distinct from audit, investigation and final tax determination. |
29. Section 59 vs Section 61
| Point | Section 59 | Section 61 |
|---|---|---|
| Main purpose | Taxpayer self-assesses tax. | Officer scrutinises the taxpayer's return. |
| Who acts? | Registered person. | Proper officer. |
| Starting point | Normal return preparation. | Return selected for scrutiny. |
| Notice | Normal return does not require ASMT-10. | ASMT-10 where discrepancy is noticed. |
| Response | Not applicable as scrutiny. | ASMT-11. |
| Closure | Return filing. | ASMT-12 where explanation/information is acceptable. |
30. Common mistakes
- Ignoring an ASMT-10 because it is “only scrutiny”.
- Sending a generic reply without a numerical reconciliation.
- Answering only the tax amount and not the reason for the difference.
- Failing to check the exact tax period.
- Providing unsupported statements without documents.
- Admitting liability without independently checking the calculation.
- Assuming every GSTR-1/GSTR-3B difference means tax evasion.
- Ignoring GSTR-2B, e-way bill or other relevant reconciliations.
- Missing the response period.
- Confusing ASMT-10 scrutiny with a final demand order.
31. Professional workflow
Record date, period, officer and response deadline.
Create one row for every issue.
Match the notice figures with accounting records.
Compare GSTR-1, GSTR-3B, GSTR-2B and other relevant data.
Timing, amendment, classification, omission or genuine liability.
Determine tax, interest and other amount if applicable.
Index invoices, ledgers, returns and supporting documents.
Respond point-by-point.
Tax + legal + documentary review before submission.
Track ASMT-12 or subsequent proceedings.
32. Section 61 GST FAQs
What is Section 61 of the CGST Act?
Section 61 allows the proper officer to scrutinise a registered person's return and related particulars to verify correctness and seek an explanation for discrepancies.
What is GST scrutiny?
It is a return-level verification process in which the officer compares the return with related information available to the department and asks the taxpayer to explain discrepancies.
What is ASMT-10?
ASMT-10 is the scrutiny notice issued under Rule 99 when a discrepancy is noticed.
What is ASMT-11?
ASMT-11 is the taxpayer's response to the ASMT-10 discrepancy, including explanation or intimation of payment where the discrepancy is accepted.
What is ASMT-12?
ASMT-12 is the communication issued where the explanation or information submitted by the taxpayer is found acceptable.
Is ASMT-10 a GST demand notice?
No. ASMT-10 is a scrutiny notice seeking explanation. It is not itself a final determination of tax liability.
How many days are available to reply to ASMT-10?
Section 61(3) provides 30 days, or such further period as may be permitted. The taxpayer should always follow the specific response period stated in the notice.
Can the officer ask for GSTR-2B reconciliation?
Yes, where relevant to the discrepancy, the officer may use available ITC-related information and seek an explanation supported by records.
Can scrutiny lead to a GST audit?
Yes. Section 61(3) expressly allows appropriate action including Section 65 audit, Section 66 special audit or Section 67 action where the statutory conditions are met.
Can scrutiny lead to tax demand proceedings?
Yes. Where the discrepancy remains unresolved, the officer may proceed to determine tax and other dues under the applicable statutory provision, including the period-sensitive Section 73/74 framework or Section 74A where applicable.
Does receiving ASMT-10 mean the taxpayer has committed fraud?
No. A scrutiny notice only identifies a discrepancy requiring explanation. A discrepancy can arise from timing, reporting, classification or other legitimate reasons.
Should I accept every discrepancy mentioned by the officer?
No. The taxpayer should independently reconcile the issue. If the discrepancy is genuine, it should be accepted and corrected; if it has a valid explanation, supporting evidence should be provided.
What is the best way to reply to ASMT-10?
Use a point-wise numerical reconciliation supported by invoices, ledgers, returns and legal explanation wherever necessary.
Can ASMT-12 be issued if the explanation is accepted?
Yes. Rule 99 provides for ASMT-12 where the explanation or information submitted is found acceptable.
34. Key takeaways
- Section 61 is the statutory basis for scrutiny of GST returns.
- The officer checks the return and related particulars for correctness.
- ASMT-10 communicates discrepancies and seeks explanation.
- ASMT-11 is the taxpayer's response or payment/intimation.
- ASMT-12 communicates acceptance/closure where the explanation or information is satisfactory.
- An ASMT-10 is not itself a final tax demand.
- A good response should be point-wise, numerical, documentary and period-specific.
- GSTR-1, GSTR-3B, GSTR-2B, e-way bills and other available data can be relevant to scrutiny.
- If the discrepancy remains unresolved, further audit, investigation or tax-determination action may follow under the applicable provisions.
- Strong monthly GST reconciliation is the best practical preparation for Section 61 scrutiny.
Reference policy: This article intentionally does not embed external reference hyperlinks. Legal authorities are identified by Act section, Rule, notification/instruction and Government material.
Disclaimer: This guide is written in simple language for practical educational use. The response to an actual scrutiny notice should be based on the exact notice, tax period, records and applicable law.