Key Takeaways on Income Tax vs GST Notices
- Income Tax notices are income-driven (source-wise scrutiny). GST notices are transaction-driven (invoice-wise scrutiny). Response process completely different
- Income Tax notices sent through Income Tax e-Filing portal (incometax.gov.in) . GST notices sent through GST portal (gst.gov.in)
- Common Income Tax notices: 143(1) (intimation), 139(9) (defective return), 142(1) (inquiry), 143(2) (scrutiny), 148 (reassessment)
- Common GST notices: ASMT-10 (scrutiny), DRC-01 (demand), REG-03 (registration clarification), REG-17 (cancellation)
- Ignoring either notice can lead to penalties, tax demands, and legal action—but escalation path differs
- Bookmark this page as quick-reference guide to identify which notice received and what to do next
You open email and see tax department notification. Heart rate spikes. Is it Income Tax notice? GST notice? Or something else? Response process depends entirely on answer.
Indian taxpayers now operate under two parallel tax systems: Income Tax (direct tax) and GST (indirect tax). Each has own department, own portal, own notice types, and own response procedures. Replying to Income Tax notice on GST portal—or vice versa—impossible.
This guide helps distinguish between Income Tax notices and GST notices at glance, understand what to do when each type received, and avoid costly mistakes.
Quick Identification: Income Tax Notice or GST Notice?
Before panic, ask yourself these three questions:
| Question | Income Tax Notice | GST Notice |
|---|---|---|
| Which department? | Income Tax Department | GST Department |
| Which portal? | Income Tax e-Filing portal (incometax.gov.in) | GST portal (gst.gov.in) |
| What is it about? | Your total income, TDS, AIS mismatches | Your GST returns, ITC, invoices |
If email or SMS received, check sender. Income Tax communications from Income Tax Department. GST communications from GSTN (Goods and Services Tax Network).
Income Tax Notices: Types, Triggers, and Responses
Income Tax notices issued under Income Tax Act, 1961 (for AY 2026-27) and Income Tax Act, 2025 (for TY 2026-27 onwards). They are income-driven—department scrutinising total income, deductions, and tax payments.
Common Income Tax Notice Types
| Notice Type | Section | What It Is | Deadline | Response |
|---|---|---|---|---|
| Intimation | 143(1) | Automated intimation after ITR processing | 30 days | Online response |
| Defective Return | 139(9) | ITR has missing or incorrect information | 15 days | Rectified ITR |
| Inquiry | 142(1) | Department needs additional documents or clarifications | 15-30 days | Submit documents |
| Scrutiny | 143(2) | Return selected for detailed examination | 15-30 days | Submit explanations |
| Reassessment | 148 | Income has escaped assessment | As specified | File return or reply |
| Defective Notice | 139(9) | Return has omissions or errors | 15 days | Correct and resubmit |
Common Triggers for Income Tax Notices
- Mismatch between AIS/Form 26AS and ITR
- Discrepancy between GST turnover and Income Tax records
- High-value transactions not reported
- TDS credit mismatch
- Claiming deductions without proper documentation
How to Reply to an Income Tax Notice
- Login to e-Filing Portal: Go to www.incometax.gov.in
- Navigate to e-Proceedings: Dashboard → Pending Actions → e-Proceedings
- Select Notice: Download notice and review demands
- Submit Response: Click 'Submit Response' and attach supporting documents
- Submit: Declare and submit. Note down Transaction ID
Consequences of Ignoring an Income Tax Notice
- Penalty up to ₹10,000 under Section 272A(1)(d)
- Ex-parte assessment by Assessing Officer
- Disallowance of claimed credits or deductions
- Interest under Sections 234B and 234C
- Loss of carry-forward of losses
GST Notices: Types, Triggers, and Responses
GST notices issued under CGST Act, 2017. They are transaction-driven—department scrutinising invoices, returns, and Input Tax Credit claims.
Common GST Notice Types
| Notice Type | Section | What It Is | Deadline | Response |
|---|---|---|---|---|
| Registration Clarification | REG-03 | Issues with registration application | 7 working days | REG-04 |
| Cancellation Show-Cause | REG-17 | Proposed cancellation of registration | 7 working days | REG-18 |
| Scrutiny Notice | ASMT-10 | Discrepancies in returns | 30 days | ASMT-11 |
| Demand Notice | DRC-01 | Tax demand show-cause | 30 days | DRC-06 |
| Audit Notice | ADT-01 | Books and records audit | As specified | As specified |
Common Triggers for GST Notices
- GSTR-1 vs GSTR-3B mismatch
- ITC claimed > GSTR-2B (DRC-01C notices)
- Late or non-filing of returns
- Export data mismatches
- E-way bill or e-invoice discrepancies
- Registration application issues
How to Reply to a GST Notice
- Login to GST Portal: Go to www.gst.gov.in
- Navigate to View Notices: Services → User Services → View Notices and Orders
- Identify Notice: Find notice and click 'Reply'
- Upload Response: Submit in prescribed format with supporting documents
- Submit: Authenticate using DSC or EVC
Consequences of Ignoring a GST Notice
- Best-judgment assessment using available information
- Penalty of ₹10,000 or 10% of tax due
- 10% penalty if paid within 30 days, 100% if confirmed after deadline
- GST registration cancellation
- Tax demand with 18% interest
Income Tax vs GST Notice: Quick Comparison
| Aspect | Income Tax Notice | GST Notice |
|---|---|---|
| Department | Income Tax Department | GST Department |
| Portal | incometax.gov.in | gst.gov.in |
| Nature | Income-driven (source-wise scrutiny) | Transaction-driven (invoice-wise scrutiny) |
| Trigger | AIS/TDS mismatch, high-value transactions | GSTR/ITC mismatch, invoice errors |
| Common Types | 143(1), 139(9), 142(1), 143(2), 148 | ASMT-10, DRC-01, REG-03, REG-17 |
| Typical Deadline | 15-30 days | 7-30 days (depends on type) |
| Response Mode | e-Proceedings on e-Filing portal | View Notices section on GST portal |
| Consequence of Ignoring | Ex-parte assessment, penalty | Best-judgment assessment, cancellation |
Decision Tree: Which Notice Did You Receive?
Step 1: Check the Portal
On incometax.gov.in (e-Proceedings section)? → Income Tax Notice. Go to Income Tax Notice Response Guide (below)
On gst.gov.in (View Notices section)? → GST Notice. Go to GST Notice Response Guide (below)
Step 2: Identify the Notice Type
For Income Tax:
- Contains Section 143(1)? → Intimation notice
- Contains Section 139(9)? → Defective return notice
- Contains Section 142(1)? → Inquiry notice
- Contains Section 143(2)? → Scrutiny notice
- Contains Section 148? → Reassessment notice
For GST:
- Contains REG-03? → Registration clarification
- Contains REG-17? → Cancellation show-cause
- Contains ASMT-10? → Scrutiny notice
- Contains DRC-01? → Demand notice
- Contains DRC-01C? → ITC mismatch notice
Step 3: Check Deadline
Notice clearly states deadline. Mark it on calendar immediately. Add 2-3 days buffer for submission delays.
Income Tax Notice Response Guide
What to Submit?
For Intimation Notice (143(1)):
- Review automated intimation
- Verify TDS credit and AIS data
- File reply if discrepancies found
For Defective Return (139(9)):
- Resubmit return with corrections
- File within 15 days
For Inquiry (142(1)):
- Gather documents related to specific queries
- Prepare explanatory notes addressing each point
- Submit with supporting evidence
For Scrutiny (143(2)):
- Comprehensive response to all queries
- Detailed documentation (invoices, bank statements, GST returns)
- Separate explanation for each item under scrutiny
For Reassessment (148):
- Response explaining income escaping assessment
- All relevant evidence from prior years
- Amended return if necessary
Response Timeline
| Notice Type | Deadline | Action |
|---|---|---|
| 143(1) | 30 days | Review and reply on portal |
| 139(9) | 15 days | File rectified ITR |
| 142(1) | 15-30 days | Submit documents and explanations |
| 143(2) | 15-30 days | Detailed response with evidence |
| 148 | As specified | File response before specified date |
Pro Tips for Income Tax Notice Response
- Don't ignore timelines - Ex-parte assessment follows non-compliance
- Be comprehensive - Address every point raised in notice
- Attach documents - Don't just explain; provide proof
- Use clear language - Avoid jargon; be direct
- Keep copies - Save all submissions and transaction IDs
- Consider professional help - CA can strengthen your case
GST Notice Response Guide
What to Submit?
For Registration Clarification (REG-03):
- Clear response to each query
- Supporting documents proving accuracy
- Rectified information if needed
For Cancellation Show-Cause (REG-17):
- Detailed explanation of default reason
- Proof of rectification
- Request for retention of registration
For Scrutiny (ASMT-10):
- Reconciliation of GSTR-1 vs GSTR-3B vs GSTR-2B
- Invoice-wise breakdown if requested
- Explanations for discrepancies
- Supporting documents (e-invoices, e-way bills)
For Demand (DRC-01):
- Detailed response to each demand
- Proof of payment if already paid
- Request for revision if calculation error
For ITC Mismatch (DRC-01C):
- GSTR-2B vs GSTR-3B reconciliation
- Follow-up communications with suppliers
- Explanation for pending or rejected ITC
Response Timeline
| Notice Type | Deadline | Action |
|---|---|---|
| REG-03 | 7 working days | Submit clarifications with documents |
| REG-17 | 7 working days | File show-cause response |
| ASMT-10 | 30 days | Submit reconciliation and explanations |
| DRC-01 | 30 days | Respond to demand or submit proof of payment |
| DRC-01C | As specified | Reconcile ITC mismatch |
Pro Tips for GST Notice Response
- Reply on portal only - Use official GST portal reply mechanism
- Authenticate properly - Use DSC or EVC for submission
- Attach documents - PDFs of invoices, returns, bank statements
- Reconcile systematically - Use tables to show matching of data
- Explain discrepancies - Don't just say "corrected"; explain why
- Keep records - Save receipt and submission ID
- Follow up - Check portal status periodically
When to Consult a CA
Consult CA when:
- Notice raises complex issues (transfer pricing, depreciation)
- Multiple years or multiple entities involved
- Large tax exposure (demand > ₹5 lakh)
- Notice involves both Income Tax and GST
- You missed the deadline (CA can file late response with explanation)
- Penalty or prosecution risk involved
How Tax Garden Helps
Receiving a tax notice can be stressful and confusing. Understanding which notice type you received, what to submit, and when to submit is critical for avoiding penalties and protecting your interests.
Tax Garden's CAs help you:
- Identify notice type and understand requirements
- Gather and organize supporting documents
- Prepare comprehensive, persuasive responses
- Meet deadlines and track status
- Represent you before tax authorities if needed
- Appeal assessments if unfavorable
Sources: Income Tax Department (incometax.gov.in); GST portal (gst.gov.in); CBDT circulars; GSTN communications. Verify current procedures, deadlines, and requirements on official portals before acting, as rules may be updated periodically. This article is general information on tax notices and not substitute for professional advice.
