1. Introduction
In the post–faceless and data-driven compliance environment, notices under GST and Income Tax have become more frequent, system-generated, and analytics-based. While both laws aim to plug revenue leakages, their procedures, legal foundations, timelines, and response strategies differ significantly.
This article presents a comparative study of common GST and Income Tax notices, reasons for issuance, response mechanisms, and best practices for taxpayers and professionals.
2. Objectives of Notices Under Both Laws
| Law | Purpose of Notice |
| GST | Mismatch detection, ITC verification, non-filing, tax short payment, incorrect availment, fake credit, audit observations |
| Income Tax | Return verification, mismatch in AIS/TIS/26AS, scrutiny selection, non-reporting of income, TDS/TCS issues, capital gains mismatch |
Although both laws rely heavily on data analytics, their enforcement style differs:
- GST notices are more transaction-driven (invoice-wise scrutiny).
- Income Tax notices are income-driven (source-wise scrutiny).
3. Common Notices Under GST
Below are the most frequently issued GST notices:
3.1 GST ASMT-10 – Mismatch / Discrepancy Notice
Issued for differences between:
- GSTR-1 vs GSTR-3B
- ITC mismatch between GSTR-2B vs GSTR-3B
- Turnover mismatch with Income Tax data
3.2 GST DRC-01 / DRC-01A – Show Cause Notice
Issued for:
- Wrong availment of ITC
- Short payment of tax
- Fraudulent transactions
- Suppression of turnover
3.3 GSTR-3A – Non-Filing Notice
Sent if GSTR-1, 3B, or 9 is not filed.
3.4 Annual Return Related Notices
Under Section 73/74 after departmental audit (AG Audit, GST Audit, Enforcement).
4. Common Notices Under Income Tax
4.1 Section 143(1)(a) – Return Adjustment
For mismatch in:
- Deductions
- TDS credit
- Income reporting
- Arithmetic errors
4.2 Section 139(9) – Defective Return Notice
Issued if return is incomplete or contains inconsistencies.
4.3 Section 143(2) – Scrutiny Notice
Issued for:
- High-value transactions
- Capital gains mismatch
- Business loss claims
- Cash deposits
- AIS / 26AS discrepancies
4.4 Section 148 – Income Escaping Assessment
Issued when the department believes income has been under-reported or escaped assessment.
5. Comparative Study – GST vs Income Tax Notices
5.1 Nature of Notice
| Parameter | GST | Income Tax |
| Trigger | Return mismatch, fake ITC, non- filing | Income mismatch, AIS/TIS, scrutiny selection |
| Source | GSTN system or GST officer | CPC, Faceless Assessment, AO |
| Level of Detail |
Invoice level | PAN-level income |
5.2 Response Timeline
| Law | Typical Timeline |
| GST | 7–15 days (sometimes 3 days for enforcement notices) |
| Income Tax | 7–30 days depending on notice type |
GST timelines are generally shorter and more rigid.
5.3 Mode of Issue
- GST: Portal + Email + SMS
- Income Tax: Portal + Email + sometimes physical notice
5.4 Consequences of Non-Response
| GST | Income Tax |
| Blocking of ITC, suspension of GSTIN, penalty, tax demand, prosecution | Best judgment assessment, penalty, interest, reopening of past years |
6. How to Handle GST Notices – Practical Steps
√ 1. Read the notice carefully
Identify:
- Section
- Due date
- Required documents
- Period of notice
√ 2. Match data
Reconcile difference between:
- 3B vs 1
- 2B vs 3B
- Books vs returns
√ 3. Prepare a strong reply with evidence
Attachments may include:
- Invoices
- E-way bills
- Ledger extracts
- Payment proofs
√ 4. File reply on GST portal
Use “Reply to Notice” / DRC-01 / ASMT-11 interface.
√ 5. Avoid admissions
Unnecessary admissions may lead to penalties under Section 73/74.
7. How to Handle Income Tax Notices – Practical Steps
√ 1. Log in and verify notice authenticity
Use IT Portal → “e-Proceedings” or “View Notices”
√ 2. Analyse AIS/TIS/26AS
Most notices are mismatch-based.
√ 3. Prepare computation & justification
Provide:
- Source-wise income details
- TDS/TCS evidence
- Capital gain workings
- Source of cash deposits
√ 4. Upload structured reply
Under e-Proceedings, submit concise, factual explanations.
√ 5. Keep supporting documents ready
Especially for:
- Property sale
- Cash deposits
- Foreign remittances
- Loans and gifts
8. Documentation Required in GST vs Income Tax Notices
| Area | GST Documents | Income Tax Documents |
| Sales | Invoices, e-way bills, GSTR-1, e-invoice data | 26AS, AIS, bank statements, contracts |
| ITC | Purchase invoices, GSTR-2B, supplier compliance | TDS/TCS certificates, interest certificates |
| Ledger | Electronic credit ledger, liability ledger | Books of accounts, ledgers |
| Others | Transport docs, stock register | Proof of investments, capital gains workings |
9. When to Escalate or Appeal
GST
- Against adjudicating order →
File Appeal in APL-01 within 3 months.
Income Tax
- Against assessment order →
File Appeal to CIT(A) within 30 days.
10. Best Practices to Avoid Notices Under GST
- Monthly reconciliation of GSTR-1, 3B & 2B
- Vendor compliance monitoring
- E-invoice validation
- Maintaining transport & stock records
Under Income Tax
- Crosscheck AIS/TIS before filing ITR
- Match TDS with 26AS
- Avoid large cash transactions
- Keep documentary proof of all major transactions
11. Conclusion
Notices under both GST and Income Tax are becoming more AI-driven, automated, and analytics-based. The key to handling them successfully is timely response, proper documentation, and accurate reconciliation.
Understanding the differences between GST notices and Income Tax notices helps professionals prepare more effective replies and reduce litigation risk. A systematic approach—combined with strong bookkeeping and compliance discipline—ensures that notices become a manageable part of taxation rather than a crisis.
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