Block Assessment Under Section 158BC Consolidates Undisclosed Income From Search Cases. Learn About The 60% Tax Rate, 12-Month Time Limit, And How Finance Act 2025 Changed The Rules.
Introduction
Imagine this: You’re running a small business. One day, income tax officials show up at your office with a search warrant. They spend days going through your books, documents, and digital records. Now what?
This is where block assessment comes into play.
Block assessment is a special procedure under the Income Tax Act that applies when the tax department conducts a search on your premises. Instead of assessing your income year by year, the department consolidates everything into one single assessment covering multiple years.
In simple terms: if the tax department knocks on your door with a search warrant, they’ll look at your income from the past six years plus the current year up to the search date—all in one go.
The stakes are high. Any undisclosed income discovered during this process can be taxed at a flat 60%. Yes, you read that right—60%!
But here’s the good news: recent changes have made the process fairer. Previously, even your honestly disclosed income could get taxed at that punishing 60% rate. The Finance Act 2025 fixed this—now only the undisclosed portion attracts that rate.
Let’s break down everything you need to know about block assessment in plain, simple English.
What Is Block Assessment?
Block assessment is a consolidated tax assessment procedure introduced under Chapter XIV-B of the Income-tax Act, 1961 (Sections 158B to 158BI).
Think of it this way: Normally, you file your income tax return every year, and the tax department assesses each year separately. But when they conduct a search on your premises, they don’t want to go through six different years separately. Instead, they bundle everything into one block and assess it all at once.
When Does Block Assessment Apply?
Block assessment applies when:
- A search under Section 132is initiated on or after September 1, 2024
- A requisition under Section 132Ais made on or after the same date
The key date is when the search is authorized—not when it actually happens on the ground.
For Example:
If the tax department gets authorization to search your premises on October 15, 2024, and the actual search takes place on October 20, 2024, the block assessment rules apply because the authorization date is after September 1, 2024.
What Happens to Your Pending Regular Assessments?
Here’s an important point: any regular assessment or reassessment that was pending on the date of the search gets abated (meaning it stops).
Instead, everything gets folded into the single block assessment. This is actually good news because it means one assessment, one order, one appeal—instead of fighting multiple battles across different years.
Understanding the Block Period
The block period is the time frame that gets covered in a block assessment.
What Does the Block Period Include?
The block period consists of two parts:
- Six previous years—the assessment years immediately preceding the year in which the search was initiated
- The partial current year—from April 1 of the year in which the search was initiated up to the date of the last search authorization
A Real-World Example
Let’s make this concrete.
Suppose the income tax department initiates a search on your premises on September 15, 2024, and the last search authorization is executed on November 10, 2024.
Your block period would be:
| Period | Years Covered |
| Year 6 | April 1, 2018 – March 31, 2019 |
| Year 5 | April 1, 2019 – March 31, 2020 |
| Year 4 | April 1, 2020 – March 31, 2021 |
| Year 3 | April 1, 2021 – March 31, 2022 |
| Year 2 | April 1, 2022 – March 31, 2023 |
| Year 1 | April 1, 2023 – March 31, 2024 |
| Partial Year | April 1, 2024 – November 10, 2024 |
That’s six full years plus a partial year—all assessed in one single block!
What Counts as “Undisclosed Income”?
This is the million-dollar question. What exactly does the tax department consider “undisclosed income”?
Under Section 158B of the Income Tax Act, undisclosed income has a broad definition.
Types of Undisclosed Income
Undisclosed income includes:
- Undisclosed Assets
- Money, bullion, jewellery, or other valuable items
- Virtual digital assets(cryptocurrency, NFTs, etc.)
- Any asset that represents income or property not disclosed for tax purposes
- Income from Books of Accounts or Documents
- Any income based on entries in books of account
- Income reflected in any document or transaction that wasn’t disclosed
- Incorrect Claims
- Expenses that were claimed incorrectly
- Exemptions, deductions, or allowances claimed but found to be incorrect
For Example:
Suppose you run a restaurant and claim ₹10 lakh as “staff salary” expenses. If the tax department finds during a search that half of this amount was actually your personal spending, that ₹5 lakh would be treated as undisclosed income.
Important Update: Virtual Digital Assets Now Included
Starting February 1, 2025, the definition of undisclosed income now explicitly includes virtual digital assets like cryptocurrency and NFTs.
This means if you hold crypto assets and haven’t disclosed them properly, they could be treated as undisclosed income during a block assessment.
The Block Assessment Procedure (Section 158BC)
So how does the actual process work? Here’s the step-by-step breakdown under Section 158BC.
Step 1: Notice to File Return
After the search is concluded, the Assessing Officer issues a notice requiring you to file a return. You get 60 days from the date of the notice to file your return.
Step 2: File Form ITR-B
You must file your block assessment return in a special form called ITR-B.
The Central Board of Direct Taxes (CBDT) introduced this form through a notification on April 7, 2025.
Key features of ITR-B:
- Focuses only on income pertaining to the block period
- Requires detailed disclosure of undisclosed income
- Classifies assets into specific categories (money, bullion, jewellery, virtual digital assets, etc.)
Step 3: Assessment by the Officer
The Assessing Officer then:
- Examines your return and the evidence from the search
- Determines the undisclosed income for the block period
- Passes a single block assessment order
Step 4: Tax Calculation
The undisclosed income is taxed at the rate specified in Section 113—which is a flat 60%.
Time Limits: How Long Does It Take?
The tax department doesn’t have unlimited time to complete a block assessment. There are strict time limits under Section 158BE.
The 12-Month Rule
The block assessment must be completed within 12 months.
Important Update: Under the Finance Act 2025, the counting of these 12 months has changed:
| Before Finance Act 2025 | After Finance Act 2025 |
| 12 months from the end of the month in which the last search authorization was executed | 12 months from the end of the quarter in which the last search authorization was executed |
What Does This Mean in Practice?
For Example:
If the last search authorization was executed on November 10, 2024:
- Old rule:12 months from November 30, 2024 → deadline is November 30, 2025
- New rule:12 months from December 31, 2024 → deadline is December 31, 2025
The new rule gives the department a bit more time, which helps in complex cases involving multiple parties.
The 60% Tax Rate: What You Need to Know
Let’s talk about the elephant in the room—the 60% tax rate.
How the Rate Works
Under Section 113, any undisclosed income from the block period is taxed at a flat 60%.
This rate applies to:
- Individuals
- Hindu Undivided Families (HUFs)
- Partnership firms
- Limited Liability Partnerships (LLPs)
- Companies
The Big Change in Finance Act 2025
Here’s where things get interesting—and fairer.
Earlier, the law required taxpayers to disclose their “total income” in the block assessment return—including both disclosed and undisclosed income. The 60% rate applied to the entire amount.
This meant that even your honestly reported income could get taxed at 60%—which was grossly unfair.
Finance Act 2025 fixed this.
The law now uses the term “total undisclosed income” instead of “total income”. This means:
- Only the undiscovered, hidden incomegets the 60% rate
- Your previously disclosed, honest income is protectedfrom this penal rate
This change applies retrospectively from September 2024.
For Example:
During a search, the department finds that you have ₹50 lakh of disclosed income (which you already reported) and ₹20 lakh of undisclosed income (which you hid). Under the old rules, all ₹70 lakh would be taxed at 60%. Under the new rules, only the ₹20 lakh of undisclosed income gets the 60% rate. Your ₹50 lakh of disclosed income is taxed at normal rates.
Penalties: What Else Could You Face?
The 60% tax rate is just the beginning. You could also face penalties.
Penalty Provisions
Under Section 158BFA, penalties may be levied in specified cases.
The penalty can be 10% of the undisclosed tax base.
Immunity from Interest and Penalty
However, there’s a silver lining. Section 158BF provides immunity from:
- Interest under Sections 234A, 234B, and 234C
- Penalty under Section 270A
This means if you cooperate and disclose properly, you might avoid additional interest and penalties.
How to Respond to a Block Assessment Notice
If you receive a block assessment notice, don’t panic. Here’s what you should do:
1. Don’t Ignore It
The worst thing you can do is ignore the notice. The 60-day deadline to file your return is strict.
2. Gather Your Documents
Collect all your financial records for the block period—bank statements, invoices, receipts, and any other relevant documents.
3. Consult a Professional
Block assessment is complex. Work with a chartered accountant or tax professional who understands the nuances of Chapter XIV-B.
4. File ITR-B on Time
File your Form ITR-B within the 60-day deadline. The form is now available for online filing.
5. Be Honest and Transparent
Remember: the 60% rate now applies only to undisclosed income. If you’re honest about what you previously disclosed, you won’t be penalized on that portion.
6. Cooperate Fully
Provide all information requested by the Assessing Officer. Cooperation can help you avoid additional penalties.
Common Mistakes to Avoid
Mistake 1: Confusing “Total Income” with “Undisclosed Income”
Under the new rules, you only need to disclose undisclosed income in your block assessment return—not your entire total income.
Mistake 2: Missing the Deadline
The 60-day deadline to file ITR-B is strict. Missing it can lead to complications.
Mistake 3: Not Disclosing Virtual Digital Assets
With the new rules effective from February 1, 2025, cryptocurrency and NFTs are now part of undisclosed income. Don’t forget to disclose them.
Mistake 4: Thinking the 60% Rate Applies to All Your Income
Remember: the 60% rate applies only to undisclosed income. Your honestly disclosed income is safe.
Recent Updates You Should Know About
Finance Act 2025 Changes
| Provision | What Changed |
| Section 158B | “Virtual digital asset” added to definition of undisclosed income |
| Section 158BA | Added terms “recomputation,” “reference,” and “order” for consistency |
| Section 158BA(4) | Replaced “pending” with “required to be made” |
| Section 158BB | Replaced “total income disclosed” with “undisclosed income” |
| Section 158BE | Time limit changed from “end of month” to “end of quarter” |
| Section 113 | Now refers to “total undisclosed income” instead of “total income” |
New ITR-B Form
The CBDT introduced Form ITR-B on April 7, 2025, specifically for block assessment returns. This form:
- Is designed for online filing
- Requires detailed disclosure of undisclosed income
- Classifies assets into specific categories
Frequently Asked Questions
- Does block assessment apply to all income tax searches?
No. Block assessment applies only to searches authorized on or after September 1, 2024. Searches before this date follow the old Section 153A regime.
- Can I file a revised ITR-B return?
Yes, taxpayers can file a revised return if needed. However, it’s best to file correctly the first time to avoid complications.
- What is Form ITR-B and where is it filed?
Form ITR-B is the special return form for block assessments. It is filed online through the income tax e-filing portal.
- Does the 60% rate apply to the entire block income or only undisclosed income?
Only undisclosed income attracts the 60% rate. Your previously disclosed income is taxed at normal rates.
- What happens to a regular assessment pending on the date of search?
Any pending regular assessment or reassessment for a year falling in the block period abates (stops) from the date of the search. Everything is folded into the single block assessment.
- Can a taxpayer apply for settlement during block assessment?
Settlement provisions may apply in certain cases. Consult a tax professional for guidance specific to your situation.
- Is there a penalty in addition to the 60% tax?
Yes, penalties may apply under Section 158BFA in specified cases. The penalty can be 10% of the undisclosed tax base. However, immunity from certain interest and penalties is available under Section 158BF.
Final Thoughts
Block assessment is a powerful tool for the income tax department to tackle undisclosed income. But with the Finance Act 2025 amendments, the process has become fairer for honest taxpayers.
The key takeaways:
✅ Block assessment applies to searches from September 1, 2024 onward
✅ The block period covers six previous years plus the current partial year
✅ Only undisclosed income attracts the 60% tax rate—your disclosed income is safe
✅ You have 60 days to file Form ITR-B
✅ The assessment must be completed within 12 months from the end of the quarter
If you ever receive a block assessment notice, don’t panic. Work with a qualified professional, be transparent, and remember that the law now protects your honestly disclosed income from that penal 60% rate.
