Income Tax Notice: Types, Reasons, How to Check and Respond

An income tax notice is an official communication from the Income Tax Department flagging a discrepancy, missing information, or a required action on your tax return. Receiving one is usually a request for information, not an accusation of fraud or wrongdoing. Each notice is issued under a specific section of the Income-tax Act: most commonly Section 143(1) (intimation), 143(2) (scrutiny), 142(1) (inquiry), 148 (reassessment), 139(9) (defective return), 156 (demand) or 245 (refund adjustment), and each carries its own response deadline, usually 15 or 30 days. Always authenticate the notice on the e-filing portal (incometax.gov.in) before acting, then respond within the stated deadline to avoid penalties, interest, or a best-judgment assessment.

An income tax notice is a formal, section-specific communication from the Income Tax Department asking you to verify, correct, or explain something in your tax records. In most cases it is a routine request for information, not a penalty or a sign of fraud, so a notice on its own is rarely as serious as it first feels. What matters is the section it is issued under, because that single number tells you what the department wants and how long you have.

A notice differs from an intimation. An intimation under Section 143(1) is an automatic processing summary that often needs no action, while a notice under Sections 142(1), 143(2), or 148 asks you to actively respond by a stated deadline. If you are unsure which you are holding, the difference between a Section 142(1) inquiry and a 143(2) scrutiny matters too, and the difference between a Section 142(1) and 143(2) notice is worth checking before you reply.

Any taxpayer can receive one, whether you filed a return or not, and a first notice is usually the start of a conversation rather than a verdict. Read the section number first: it tells you exactly what the department wants and how long you have.

The most common income tax notices are issued under Sections 143(1), 143(2), 142(1), 148, 139(9), 156, 245, and 133(6), and each has its own trigger and response window. The table below maps every section to what it means and your deadline; deep guidance for each lives on its dedicated page.

Two less common notices are worth knowing. A Section 148A show-cause notice is the inquiry-before-reassessment step the Assessing Officer must complete before issuing a Section 148 notice, and you get an opportunity to reply within the period specified in the notice; the detail lives with the reassessment notice under Section 148. A Section 250 notice fixes the date and place of hearing in a first appeal before the Commissioner (Appeals), so you see it only after you have already filed an appeal; it is covered under responding to a Section 250 appeal notice.

You usually get an income tax notice because the department's system found a mismatch between your return and the data it already holds in Form 26AS, AIS, or SFT reports. That data is drawn from your Form 26AS, the Annual Information Statement (AIS), and the Statement of Financial Transactions (SFT) that banks and registrars file on you. The seven most common triggers are listed below in order of frequency.

1. TDS / Form 26AS mismatch
2. Income or AIS mismatch
3. Large cash deposits / high-value transactions
4. Non-filing or late ITR
5. Excess or fake deductions claimed
6. Random scrutiny selection
7. Unreported capital gains

The single most-searched trigger is cash. Aggregate cash deposits of Rs 10 lakh or more in a year across your savings accounts, or Rs 50 lakh or more in current accounts, are SFT-reported and are the most common flag, so if your deposits outrun your declared income you can expect a question; the thresholds and replies are set out under income tax notice for cash deposits and high-value transactions. Notices tied to a registered income tax notice on property or land purchase and those aimed at income tax notice for salaried employees each have their own patterns, and the full list of triggers with prevention steps sits under reasons for an income tax notice and how to avoid one.

You authenticate an income tax notice on the e-filing portal (incometax.gov.in) using the pre-login 'Authenticate Notice/Order Issued by ITD' service, by entering either your PAN with document type, assessment year, date of issue and mobile number, or the DIN with your mobile number. Every genuine notice issued since 1 October 2019 carries a Document Identification Number (DIN); a notice without a valid DIN is not a valid notice.

Doing this before you reply protects you from fake notices and confirms the section, the assessment year, and the deadline you are actually working to. The full click-by-click walkthrough, including the PDF-password rule and what to do when the service returns 'No record found', is covered in how to authenticate an income tax notice online.

You respond to an income tax notice through the e-Proceedings tab on the e-filing portal: log in, open Pending Actions → e-Proceedings, select the notice, and submit your reply with supporting documents before the deadline. Read the notice, verify it is addressed to you (name, PAN, assessment year), gather the documents it asks for, and reply within the stated window, usually 15 or 30 days.

Keep your reply factual and attach only what the notice asks for. The complete walkthrough, the documents checklist, the attachment limits, and what to do when you disagree and want rectification or appeal are set out in how to respond to an income tax notice. If you would rather start from a template, a ready income tax notice reply letter format for the common notices is there too.

The department's time limit depends on the notice: a Section 143(2) scrutiny notice must be issued within 3 months of the end of the financial year in which you filed, while a Section 148 reassessment notice can normally reach back 3 years, and up to 5 years where the income that escaped assessment is Rs 50 lakh or more. Once the statutory window closes, a notice issued late is time-barred and invalid.

Routine intimation and scrutiny run on short windows, while reassessment runs on the longer ones, and every section has its own clock. A Section 143(1) intimation itself must normally be issued within 9 months of the end of the financial year in which the return is furnished. The full section-by-section limitation table, with the exact windows and how they are counted, lives at income tax notice time limits.

Ignoring an income tax notice can trigger a best-judgment assessment under Section 144, a penalty of Rs 10,000 per default under Section 272A(1)(d), interest, and in serious cases prosecution. If a demand under Section 156 goes unpaid for 30 days, 1% per month interest accrues under Section 220(2) and the department can attach your bank account under Section 226(3).

Silence never closes a notice; it only removes your side of the story before the department decides on its own figures. The full penalty table, the interest maths, and a worked example are set out in what happens if you ignore an income tax notice.

A genuine income tax notice shows a Document Identification Number (DIN), the section it is issued under, your PAN and name, the assessment year, and a response deadline. The department delivers notices through the e-filing portal and your registered email, and may also send them by registered or speed post or by affixture, so always cross-check any posted or emailed notice inside your e-filing account.

Knowing what an income tax notice sample or format looks like helps you spot a fake at a glance, because a real one always carries a verifiable DIN. One point of confusion is the "Section: NA" line some downloaded PDFs show: when an intimation or notice PDF displays Section: NA, it means the communication is a system-generated processing document not tied to a single assessment section, common on CPC intimations, and its genuineness is still confirmed by the DIN, not by the section field.

A notice can reach you at different stages: a Section 143(1) intimation typically arrives soon after your return is processed, a Section 143(2) scrutiny notice within 3 months of the end of the filing financial year, and a Section 148 reassessment notice years later. Yes, a notice can arrive even after you have received your refund, because a refund is only provisional until the assessment window closes.

The 143(1) intimation comes once the Centralized Processing Center (CPC) finishes processing, and the later windows follow the limitation clock rather than your filing date. For the complete timeline of how far back the department can go, see how far back the department can go; for the post-processing detail, see the notice under Section 143(1).

1. Read the section first. The section number tells you what the notice is: Section 143(1) is a routine intimation, while 142(1), 143(2), or 148 demand an active reply by a stated deadline.
2. Most deadlines are 15 or 30 days. A Section 139(9) defective-return notice gives 15 days; a 143(1)(a) adjustment, a Section 156 demand, and a Section 245 refund set-off each give 30 days.
3. Authenticate before you act. Every genuine notice issued since 1 October 2019 carries a Document Identification Number (DIN); verify it on the e-filing portal, because a notice with no valid DIN is not valid.
4. Ignoring it is costly. Silence can bring a best-judgment assessment under Section 144, a Rs 10,000 penalty under Section 272A(1)(d), 1% per month interest under Section 220(2), and bank attachment under Section 226(3).
5. Cash deposits are watched. Aggregate cash of Rs 10 lakh in savings or Rs 50 lakh in current accounts is SFT-reported, and a mismatch with your return is a common trigger for a notice.