Form ITR-B Filing – Complete Guide to Block Assessment in Income Tax
Search and seizure cases require a very different compliance approach from regular income-tax return filing. For such cases, the law now provides a separate block assessment mechanism, and the prescribed return form for that mechanism is Form ITR-B. This is not a normal annual ITR. It is a special return meant for reporting undisclosed income of the block period in consequence of a search under section 132 or requisition under section 132A. The present block assessment regime applies where the search or requisition is initiated on or after 1 September 2024, and Form ITR-B was notified by CBDT Notification No. 30/2025 dated 7 April 2025 under Rule 12AE.
The block assessment framework was reintroduced through the Finance (No. 2) Bill, 2024 / Finance Act, 2024 because the earlier search assessment model under reassessment provisions was leading to staggered year-wise proceedings, prolonged litigation, lack of coordinated investigation, and a long period of uncertainty for both taxpayers and the Department. The official memorandum clearly states that the objectives behind reintroducing block assessment were early finalisation of search assessments, coordinated investigation, and reduction in multiplicity of proceedings.
What is Form ITR-B?
Form ITR-B is the return prescribed for block assessment of undisclosed income. It is required to be filed when the Assessing Officer issues a notice under section 158BC or section 158BC read with section 158BD after a search or requisition action. The Income Tax Department’s user manual expressly states that ITR-B is to be used where a person or entity is subjected to search under section 132 or requisition under section 132A, and the AO issues the block assessment notice.
In simple words, a regular ITR reports the income that a taxpayer voluntarily discloses for one assessment year. ITR-B, on the other hand, is a notice-driven return for a consolidated “block period” and is meant for income that the law treats as undisclosed in consequence of search proceedings.
Introduction and Preamble – Why ITR-B Was Introduced
The present block assessment regime is part of Chapter XIV-B. According to the official memorandum to the Finance Bill, 2024, after the Finance Act, 2021, search cases were effectively being handled through the reassessment route. Field experience showed several difficulties under that model. In search matters, only the time-barring year would often be reopened first, followed by separate proceedings for other years, which meant the same search could keep the taxpayer engaged in litigation for many years. The memorandum records that this made the process time-consuming, raised litigation costs, created scope for inconsistent additions across years, and made coordinated investigation difficult.
To solve those problems, the law reintroduced a single consolidated block assessment system for search and requisition cases initiated on or after 1 September 2024. The official departmental guidance now describes block assessment as a special procedure for a single consolidated assessment of the total undisclosed income of the block period. It also clarifies that any pending assessments or reassessments abate and merge into the block assessment, and that the undisclosed income assessed under this scheme is taxable at 60%.
From When Does This Regime Apply?
The official departmental material states that block assessment applies where a search under section 132 or requisition under section 132A is initiated on or after 01-09-2024. The user manual for ITR-B also uses the same date.
There is also an important transition point after the coming into force of the Income-tax Act, 2025 from 1 April 2026. The official transition FAQs clarify that where a search was initiated before 1 April 2026, the proceeding continues under the Income-tax Act, 1961, by virtue of the saving clause in section 536(2)(v) of the new Act. So, in practical terms, many current ITR-B proceedings may still continue under the old Act numbering, even though the new Act has come into force.
What is the “Block Period”?
The Income Tax Department explains that the block period includes:
- the six previous years preceding the previous year in which the search or requisition is initiated; and
- the period starting from 1 April of the previous year in which the search or requisition is initiated and ending on the date of execution of the last authorisation.
This is why block assessment is much wider than an ordinary annual assessment. In practice, once the date of first search authorisation and the date of last execution are identified, the system derives the block period and the return has to be prepared for that entire span. The official ITR-B form itself captures these dates and auto-derives the block period.
What Counts as “Undisclosed Income” for Block Assessment?
The departmental assessment page explains that section 158B gives an inclusive meaning to undisclosed income. It covers not only undisclosed assets such as money, bullion, jewellery, virtual digital assets, foreign assets, and other valuable articles, but also income reflected through books, documents, or transactions that was not disclosed or would not have been disclosed. The same official guidance also states that incorrect claims of expenses, exemptions, deductions, or allowances can be treated as undisclosed income.
This is a very important practical point. In a search case, the issue is not limited to cash or jewellery found during search. The exposure may arise from seized papers, digital evidence, loose sheets, parallel books, unexplained transactions, unrecorded sales, accommodation entries, bogus expense claims, unexplained investments, or even claims that the Department alleges were wrongly made.
Main Reasons for Block Assessment and ITR-B Filing
The legal trigger for ITR-B filing is not voluntary. It generally arises because of one or more of the following reasons:
1. Search under section 132
If the Income Tax Department conducts a search under section 132 on or after 1 September 2024, the AO may proceed under Chapter XIV-B and issue notice for filing ITR-B.
2. Requisition under section 132A
Where books of account, documents, or assets are requisitioned under section 132A, the same block assessment mechanism can apply.
3. Proceedings against “other person” under section 158BD
Block assessment is not confined only to the person searched. If material found during search relates to another person, proceedings may be initiated against that other person under section 158BC read with section 158BD. The Department’s guidance specifically recognises this route.
4. Need for one consolidated assessment instead of multiple scattered proceedings
The official memorandum says the scheme was brought back because the previous search-assessment system caused staggered reassessments, duplication of proceedings, and lack of coordination. ITR-B is therefore part of a single, consolidated search assessment architecture.
5. Abatement of pending assessments
Once block assessment applies, pending assessments or reassessments abate and merge into the block assessment. This is one of the reasons why ITR-B becomes the central compliance document in a search case.
6. Determination of undisclosed income for the full block period
The scheme is designed to assess total undisclosed income for the block period in a unified manner under section 158BB. Official guidance also notes that different categories of already disclosed income are excluded while computing block income, depending on whether income was assessed, returned, recorded in books before the search, or covered by specific TDS-based provisions.
Tax Impact Under Block Assessment
This is one of the most sensitive parts of the regime. The official departmental guidance states that undisclosed income of the block period is taxable at 60% under section 158BA(7) read with section 113, along with surcharge where applicable.
The same official source further states:
- no interest under sections 234A, 234B and 234C is leviable on undisclosed income assessed for the block period by virtue of section 158BF;
- no penalty under section 270A is imposed for under-reporting/misreporting of such undisclosed income; but
- if the return is not filed within time, interest at 5% per month or part thereof may apply under section 158BFA; and
- penalty equal to 50% of the tax on the excess undisclosed income determined over and above the returned amount may be imposed in specified cases.
This means that timely and properly prepared ITR-B filing is not merely procedural; it directly affects interest, penalty, and litigation exposure.
Time Limit and Due Date for Filing ITR-B
The official portal guidance states that the AO must issue notice requiring the return of undisclosed income for the block period, and such notice must specify a time limit not exceeding 60 days, subject to permitted extension. The same guidance also notes that the AO may extend the time by 30 days in a limited audit-related situation mentioned in the proviso to section 158BC(1)(a).
The ITR-B user manual separately clarifies that the due date for filing Form ITR-B is the date specified in the notice issued by the Department.
One very important legal point is that the official guidance states that the return filed within the permitted period is treated as a return under section 139 for purposes such as notice under section 143(2), but a revised return is not allowed in block assessment.
How to File ITR-B – Practical Step-by-Step Guide
The official user manual gives the portal flow for filing ITR-B. Based on that and the practical structure of the form, the filing process can be understood as follows.
Step 1 – Read the notice carefully
The starting point is the notice under section 158BC or section 158BC read with section 158BD. Check:
- section under which notice is issued;
- DIN / document number;
- date of notice and date of service;
- due date mentioned in notice;
- block period covered;
- whether the assessee is the searched person or an “other person”.
Step 2 – Identify the block period correctly
The form requires the date of first search authorisation / requisition and the date of the last authorisation / requisition. On that basis, the block period is derived. A wrong understanding here can distort the entire return.
Step 3 – Collect prior ITRs and assessment records
The user manual expressly lists details of returns already filed for years falling in the block period as a prerequisite. This is critical because the law distinguishes between assessed income, returned income, and income already recorded in books before the date of search.
Step 4 – Reconcile seized material with disclosed records
This is the practical heart of the exercise. Every item appearing in seized papers, digital data, bank trail, property record, demat statement, cash movement, bullion/jewellery detail, foreign asset trail, VDA record, or loose document should be classified into one of these buckets:
- already disclosed and assessed;
- already disclosed in return but not assessed;
- properly recorded in books before search;
- still reconcilable with regular evidence;
- genuinely undisclosed;
- disputed / legally contestable.
That classification matters because section 158BB separates disclosed income from block-period undisclosed income.
Step 5 – Compile undisclosed income head-wise
The ITR-B form itself requires break-up of undisclosed income under heads such as:
- Salary
- House Property
- Profits and Gains of Business or Profession
- Capital Gains
- Income from Other Sources
Step 6 – Report undisclosed assets, if relevant
The portal prerequisites and the form indicate that assets such as cash, bullion, jewellery, digital assets, foreign assets, etc. may need to be disclosed wherever relevant to the undisclosed income computation.
Step 7 – Work out TDS/TCS and tax payments
The form provides schedules for TDS/TCS credit and taxes paid. The portal prerequisites also specifically mention TDS/TCS credit information that remains unclaimed for the AYs covered in the block period, along with tax computation and interest.
Step 8 – File online on the e-filing portal
The official user manual gives the following portal path:
Login → e-Proceedings → Submit to notice u/s 158BC or 158BC r.w.s. 158BD → select Form – Block ITR. After filling all required details, submit online using DSC or EVC, as applicable. The filed return can later be viewed under e-File → Income Tax Return → View Filed Return.
Step 9 – Verify correctly
The official guidance states that returns must be filed electronically. Companies, political parties and persons liable to audit under section 44AB must verify through DSC; others may use DSC or EVC.
Step 10 – Preserve working papers and response strategy
Since ITR-B becomes the foundation of the block assessment, keep a complete paper-book of:
- notice copy;
- seized material references;
- explanations and reconciliations;
- prior ITR acknowledgements;
- books of account extracts;
- tax payment proofs;
- computation notes;
- legal submissions on disputed issues.
This is especially important because block assessment often proceeds into detailed scrutiny and hearing. The return should therefore be filed only after a deliberate legal and factual review. The form itself also captures earlier returns and pending proceedings, showing that consistency across years is critical.
Structure of Form ITR-B – What the Form Generally Captures
From the official form and portal guidance, ITR-B broadly captures:
- basic particulars of assessee;
- search / requisition dates;
- block period;
- notice reference under section 158BC;
- details of earlier returns filed for the years in the block period;
- computation of undisclosed income year-wise and head-wise;
- item-wise break-up of undisclosed income;
- TDS/TCS credits;
- self-assessment tax and other tax payments;
- verification.
This design itself shows that the form is intended to compare what was already disclosed with what is now being treated as undisclosed for the block period. It is therefore a form that must be prepared with both legal understanding and forensic reconciliation.
Practical Issues Taxpayers Commonly Face in ITR-B Cases
In professional practice, the real challenge is usually not the portal filing. The challenge is deciding what should be admitted, what is already explained, and what should be contested. In block assessment matters, taxpayers often face issues such as:
- misunderstanding the scope of the block period;
- mixing regular disclosed income with alleged undisclosed income;
- inability to reconcile seized material with books;
- missing prior ITR and assessment records;
- wrong reporting of capital gains, business turnover, or cash transactions;
- casual admission of figures only to “complete filing”;
- delay in filing leading to interest and penalty exposure.
These risks are consistent with the structure of the law and the consequences described in the Department’s own guidance on interest, penalty, and treatment of undisclosed income.
Key Takeaways for Taxpayers and Professionals
1. ITR-B is not a normal annual ITR. It is a special return for block assessment in search and requisition matters under Chapter XIV-B.
2. The regime applies for searches / requisitions initiated on or after 1 September 2024.
3. The objective of the law is consolidated and faster search assessment. The official memorandum highlights early finalisation, coordinated investigation and reduction of multiple proceedings.
4. Undisclosed income under block assessment is taxed at 60%. Delay or improper filing can also trigger interest and penalty consequences under section 158BFA.
5. The block period is wider than one year. It generally covers six preceding years plus the broken period up to the last authorisation.
6. Returns already filed, assessments already completed, and entries already recorded in books matter greatly.Section 158BB framework distinguishes disclosed income from undisclosed income.
7. Revised return is not permitted in block assessment. So ITR-B should not be filed casually or in haste.
8. In many present cases, the notice may still operate under the Income-tax Act, 1961 even after 1 April 2026. That is because the transition FAQs preserve the old Act for searches initiated before commencement of the new Act.
9. Portal filing is only the last step. The real work is legal analysis, reconciliation of seized material, and careful classification of income.
10. Professional review is strongly advisable. A wrong admission in ITR-B can become the foundation of the block assessment and may materially increase tax, interest, penalty, and litigation exposure. This is an inference drawn from the statutory design of the form and the consequences attached to block assessment proceedings.
Final Word
Form ITR-B marks a significant shift in the way search-related tax matters are handled. The law now aims to replace scattered year-wise action with a more focused and consolidated block assessment. For taxpayers, this means higher responsibility at the return filing stage. For professionals, it means that fact review, evidence mapping, and statutory interpretation must happen before upload, not after assessment begins. A properly prepared ITR-B can narrow controversy; a poorly prepared one can enlarge it.
Frequently Asked Questions – FAQ on ITR-B Filing
1. What is Form ITR-B in income tax?
Form ITR-B is the prescribed return for block assessment of undisclosed income in search and seizure / requisition cases under Chapter XIV-B. It is filed in response to notice under section 158BC or section 158BC read with section 158BD.
2. Is ITR-B a normal income-tax return?
No. It is not a normal annual return. It is a special return for search-related undisclosed income of the block period.
3. When is ITR-B required to be filed?
ITR-B is required when the Assessing Officer issues notice under section 158BC or section 158BC read with 158BDafter a search under section 132 or requisition under section 132A.
4. What is the due date for filing ITR-B?
The due date is the date specified in the notice issued by the Income Tax Department.
5. Can a revised ITR-B be filed?
No. The Department’s official guidance states that revised return is not allowed in block assessment.
6. What is the tax rate in block assessment?
The official guidance states that the undisclosed income determined in block assessment is taxable at 60%.
7. Can proceedings be started against a person other than the searched person?
Yes. The law also covers cases where notice is issued under section 158BC read with section 158BD against another person based on material found during search.
8. How is ITR-B filed online?
The e-filing portal user manual states the route as: Login → e-Proceedings → Submit to notice u/s 158BC or 158BC r.w.s. 158BD → select Form – Block ITR
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Official / Legal References
- Finance (No. 2) Bill, 2024 – Memorandum explaining provisions on reintroduction of block assessment.
- Income Tax Department – Assessment page explaining Chapter XIV-B, block period, undisclosed income, procedure, tax rate, and penalty/interest.
- ITR-B User Manual – e-Filing portal for eligibility, prerequisites and filing steps.
- Form ITR-B (official notified form) under Rule 12AE.
- FAQs on Interplay and Transition – Income-tax Act, 2025 for continuing application of the 1961 Act to pre-1 April 2026 search proceedings.
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