Income Tax Notice Calculator India — Section 143/148/245 Response Guide FY 2025-26

Q: What is Section 143(1) intimation and what should I do?

Section 143(1) is an auto-processed intimation from CPC Bengaluru comparing your ITR with tax records (26AS/AIS). If there's a demand, compare the computation sheet with your ITR. If you agree, pay online. If you disagree, file a rectification under Section 154 within 30 days. Most 143(1) demands arise from TDS credit mismatches or unreported interest income.

Q: How do I verify if an Income Tax notice is genuine?

Every valid Income Tax notice must carry a Document Identification Number (DIN) as per CBDT Circular No. 19/2019 dated 14 August 2019. A notice without DIN is considered invalid. You can verify notices by logging into incometax.gov.in and checking under 'Pending Actions' → 'Worklist'. All genuine notices from the department will appear in your e-proceedings tab.

Q: What is Section 148 reassessment notice and how serious is it?

Section 148 is a reassessment notice issued when the Income Tax Department has information suggesting that your income has escaped assessment. This is a CRITICAL notice — it means the department believes you have undisclosed or under-reported income. You must file a return for the relevant assessment year and respond within the specified time. Engaging a Chartered Accountant or tax lawyer is mandatory. Post-2021 amendment, the AO must follow Section 148A procedure (issuing show cause notice) before issuing Section 148.

Q: What happens if I don't respond to an Income Tax notice?

Non-response to an Income Tax notice has serious consequences. For scrutiny notices (143(2), 142(1)), the AO can complete a 'best judgment assessment' under Section 144 without your input, typically resulting in higher tax demand. For demand notices (156), non-payment within 30 days triggers recovery proceedings including attachment of bank accounts, salary, and property. Penalties under Section 271(1)(b) of ₹10,000 per default may also apply for non-compliance.

Q: How do I respond to an Income Tax notice online?

Log in to incometax.gov.in → go to 'Pending Actions' → 'Worklist' or 'E-Proceedings'. Select the relevant notice, upload your response documents, and submit. For 143(1) demands, you can respond under 'Response to Outstanding Demand' to agree, partially agree, or disagree. For rectification requests (Section 154), use 'Services' → 'Rectification'. Always note the acknowledgment number after submitting your response.

Identify your Income Tax notice type, understand its severity, check your response deadline, and calculate demand mismatches. Covers Sections 143(1), 143(2), 148, 245, 139(9), 131(1A), 142(1), and 156. DIN verification reminder, e-proceedings guidance, and step-by-step action plan. Updated for FY 2025-26.

Identify your Income Tax notice and know what action to take

Section number from notice

Find the section number on the top or subject line of your notice

DIN Check: Every valid Income Tax notice must have a Document Identification Number (DIN) printed on it (CBDT Circular 19/2019). If your notice does not have a DIN, it may be invalid. Verify on incometax.gov.in.

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How to Use This Calculator

Notice Identifier tab

Select the section number printed on your Income Tax notice from the dropdown. The calculator will show you what the notice means, its severity level (LOW, MEDIUM, HIGH, or CRITICAL), the response deadline, and recommended actions. Every genuine notice must have a DIN (Document Identification Number) — if yours doesn’t, it may be invalid.

Response Timeline tab

Enter the notice section, the date printed on the notice, and the date you actually received it. The calculator computes your response deadline and shows a colour-coded urgency indicator: green (>15 days), yellow (7–15 days), red (<7 days), or critical (overdue). Use the e-proceedings link on incometax.gov.in to respond.

Tax Demand Calculator tab

Enter the demand amount from your 143(1) intimation or assessment order, along with your calculated tax, TDS from 26AS/AIS, advance tax, and self-assessment tax. The calculator identifies mismatches and suggests whether to pay, file a rectification under Section 154, or appeal before CIT(A).

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Income Tax Notice Types — Quick Reference

▶ Complete Notice Types Reference Table

Section	Type	Severity	Deadline	CA Needed?
143(1)	Intimation (auto-processed)	LOW	30 days	Optional
143(2)	Scrutiny notice	HIGH	~15 days	Recommended
148	Reassessment	CRITICAL	As specified	Mandatory
245	Refund adjustment	MEDIUM	30 days	Optional
139(9)	Defective return	MEDIUM	15 days	Optional
131(1A)	Preliminary inquiry	LOW	15–30 days	Optional
142(1)	Inquiry / info request	MEDIUM	~15 days	Optional
156	Demand notice	HIGH	30 days	Recommended

▶ DIN Verification — How to Check If Your Notice Is Valid

Per CBDT Circular No. 19/2019 dated 14 August 2019, every communication issued by the Income Tax Department must carry a computer-generated Document Identification Number (DIN). Notices without DIN are treated as invalid and non-est in law.

How to verify:

Log in to incometax.gov.in
Go to Pending Actions → Worklist
All genuine notices will appear here with their DIN
If a notice is NOT listed, contact your Jurisdictional AO for clarification

Common scam indicators: No DIN, asking for money transfer to personal accounts, requesting OTP/password, threatening immediate arrest without court order.

▶ How to Respond via E-Proceedings

Log in to incometax.gov.in with your PAN and password
Navigate to Pending Actions → E-Proceedings
Select the relevant notice from the list
Click “Submit Response”
Upload supporting documents (PDF format, max 50 MB per file)
Add a written submission explaining your position
Submit and note the acknowledgment number
Download confirmation receipt for your records

Tip: If you need more time, file an adjournment request through e-proceedings before the deadline expires. The AO may grant an extension.

Example

Priya — IT professional, received 143(1) intimation with ₹45,000 demand

Priya is a software engineer in Bengaluru earning ₹12 Lakh per annum. She filed her ITR-1 for AY 2026-27 on 31 July 2026. In September, she received a 143(1) intimation from CPC with a tax demand of ₹45,000.

Step 1: Identify the Notice

Section143(1)

TypeIntimation — auto-processed return

SeverityLOW

DIN present?Yes — verified on incometax.gov.in

Step 2: Check Timeline

Notice date15 Sep 2026

Receipt date18 Sep 2026 (email notification)

Response deadline18 Oct 2026 (30 days)

Days remaining30 days — sufficient time

Step 3: Analyse the Demand

Demand in intimation₹45,000

Her calculated tax₹1,17,000

TDS by employer (26AS)₹95,000

TDS on FD interest (26AS)₹3,000

Self-assessment tax paid₹19,000

Total tax paid₹1,17,000

Expected balance₹0 (fully paid)

Step 4: Find the Mismatch

Mismatch amount₹45,000

Likely causeFD interest of ₹30,000 reported in AIS but not declared in ITR. CPC added this income and computed extra tax + interest u/s 234A/B/C.

Step 5: Resolution

Action takenFiled revised return adding FD interest income. Filed rectification u/s 154 for the demand adjustment.

Revised demand₹12,400 (tax on ₹30,000 FD interest + interest)

Savings₹32,600 — original demand reduced by 72%

Priya saved ₹32,600 by carefully analysing the 143(1) intimation instead of blindly paying the full demand. Always compare the CPC computation with your own before paying.

FAQ

What is Section 143(1) intimation and what should I do? ▼

Section 143(1) is an auto-processed intimation from the Centralized Processing Centre (CPC) in Bengaluru. After you file your ITR, the CPC’s system compares your declared income, deductions, and tax credits with data from Form 26AS, AIS (Annual Information Statement), and TIS (Tax Information Statement). If there is a mismatch, a demand or refund adjustment is raised. What to do: Download the intimation from incometax.gov.in, compare the computation sheet line-by-line with your original ITR, check if all TDS credits are reflected in 26AS, and either pay the demand (if correct) or file a rectification under Section 154 (if incorrect). Most 143(1) demands arise from unreported interest income or TDS credit mismatches.

How do I verify if an Income Tax notice is genuine? ▼

Every valid Income Tax notice must carry a Document Identification Number (DIN) as per CBDT Circular No. 19/2019. A notice without DIN is legally invalid. To verify: log in to incometax.gov.in, go to Pending Actions → Worklist, and check if the notice appears there. All genuine communications from the department are available in the e-proceedings tab. Red flags for fake notices: no DIN, demands for money to personal accounts, requests for OTP/password, threats of immediate arrest without court order, and notices sent only via WhatsApp/SMS without corresponding entry on the portal.

What is Section 148 reassessment notice and how serious is it? ▼

Section 148 is a reassessment notice issued when the Assessing Officer has “information which suggests that income has escaped assessment.” This is the most serious type of IT notice (CRITICAL severity). Common triggers: high-value transactions reported in SFT (Statement of Financial Transactions), property purchases/sales, significant cash deposits, or information from foreign tax authorities. Post Finance Act 2021 amendment, the AO must first issue a notice under Section 148A, give you an opportunity to respond (show cause), and then decide whether to issue the Section 148 notice. Time limits: 3 years from end of AY (general), up to 10 years for income escaping exceeding ₹50 Lakh. Action: Engage a CA/tax lawyer immediately, respond to 148A show cause, and if 148 is issued, file a return for the relevant year.

What happens if I don’t respond to an Income Tax notice? ▼

Non-response has escalating consequences. For scrutiny notices (143(2), 142(1)): the AO completes a “best judgment assessment” under Section 144, typically resulting in significantly higher tax demand since the AO decides without your input. For demand notices (156): non-payment within 30 days triggers recovery proceedings under Section 220 — the Tax Recovery Officer can attach your bank accounts, salary, movable and immovable property. Penalties: ₹10,000 per default under Section 271(1)(b) for non-compliance with notices. For defective return (139(9)): if not corrected within 15 days (extendable), the return is treated as invalid — as if you never filed. This attracts late filing fees under Section 234F and interest under Sections 234A/B/C. Bottom line: Never ignore an Income Tax notice.

How do I respond to an Income Tax notice online? ▼

All responses are submitted electronically via incometax.gov.in. Log in with your PAN → go to Pending Actions → Worklist or E-Proceedings. Select the relevant notice, click “Submit Response,” upload supporting documents (PDF, max 50 MB per file), and submit. For 143(1) demands: go to Response to Outstanding Demand — you can agree fully, partially agree, or disagree (with reasons). For rectification (Section 154): go to Services → Rectification. For appeals: file Form 35 online before NFAC (National Faceless Appeal Centre). Always note the acknowledgment number and download the confirmation receipt. If you need more time, request adjournment through e-proceedings before the deadline.

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