19.Depreciation Rules — Block of Assets
Depreciation is one of the most important deductions available under Income Tax law for businesses and professionals. It allows taxpayers to claim gradual deduction for wear and tear of capital assets used in business or profession.
Under the Income-tax Act, 1961 and the proposed Income-tax Act, 2025 (effective from 01/04/2026), depreciation is governed primarily through the “Block of Assets” concept rather than asset-wise deduction methodology.
1. Introduction
Businesses frequently purchase assets such as machinery, computers, furniture, vehicles, and buildings for operational purposes. Since these assets provide long-term benefit, their entire cost is generally not allowed as deduction in one year.
Instead, depreciation is permitted over time to account for gradual reduction in value due to usage, obsolescence, or wear and tear.
Depreciation is an important tool for:
- Reducing taxable profit
- Matching cost with usage
- Reflecting true business income
Depreciation converts capital expenditure into periodic deduction.
Depreciation converts capital expenditure into periodic deduction.2. Meaning of Depreciation
Depreciation refers to the reduction in value of a capital asset arising from usage, passage of time, technological obsolescence, or wear and tear.
Income Tax law permits specified deduction for such reduction where assets are used for business or profession.
Depreciation generally applies to:
- Tangible assets
- Intangible assets
- Business-use assets
Only eligible business assets qualify for depreciation.
Only eligible business assets qualify for depreciation.3. Concept of Block of Assets
Under Income Tax provisions, depreciation is generally calculated on “Block of Assets” basis instead of individual asset basis.
A Block of Assets means a group of assets falling within the same category and carrying the same depreciation rate.
Examples of blocks include:
- Computers
- Furniture & fixtures
- Plant & machinery
- Motor vehicles
Assets with same depreciation rate form one block.
Assets with same depreciation rate form one block.A. TYPES OF ASSETS ELIGIBLE FOR DEPRECIATION
4. Tangible Assets
Tangible assets are physical assets used in business or profession.
These assets generally suffer wear and tear through business usage and therefore qualify for depreciation deduction.
Common tangible assets include:
- Building
- Machinery
- Plant
- Furniture
- Vehicles
- Computers
Physical business assets commonly qualify for depreciation.
Physical business assets commonly qualify for depreciation.5. Intangible Assets
Depreciation is also available on specified intangible assets under prescribed conditions.
Such assets may not have physical existence but still provide commercial or business value over time.
Examples include:
- Know-how
- Patents
- Copyrights
- Trademarks
- Licenses
- Franchises
Certain business rights also qualify for depreciation.
Certain business rights also qualify for depreciation.6. Conditions for Claiming Depreciation
Depreciation is generally allowed only when prescribed legal conditions are satisfied.
The taxpayer should establish ownership and business usage of the asset.
Important conditions generally include:
- Ownership of asset
- Business/professional use
- Asset existence within block
- Actual usage or readiness for use
Business usage is the key requirement.
Business usage is the key requirement.B. DEPRECIATION COMPUTATION
7. Written Down Value (WDV) Method
Income Tax depreciation is generally calculated using the Written Down Value (WDV) method.
Under this system, depreciation is calculated on the reducing balance value of the asset block every year.
This results in higher depreciation during initial years and lower deduction in later years.
WDV method differs from straight-line depreciation.
WDV method differs from straight-line depreciation.8. Basic Depreciation Formula
Depreciation is calculated on the Written Down Value of the relevant block of assets after considering additions and deletions during the year.
Basic Formula
\text{Depreciation} = \text{WDV of Block} \times \text{Applicable Depreciation Rate}
The applicable rate depends on the nature of the asset block.
Correct asset classification is critical.
Correct asset classification is critical.9. Opening WDV of Block
Opening WDV represents the value of the asset block carried forward from the previous year after reducing earlier depreciation.
This opening balance forms the starting point for current year depreciation computation.
Opening WDV impacts future deductions significantly.
Opening WDV impacts future deductions significantly.10. Additions During the Year
Where new assets are purchased during the year and fall within the same block, their cost is added to the existing WDV block.
The timing of purchase and usage may affect the quantum of depreciation available during the year.
Asset additions increase depreciation base.
Asset additions increase depreciation base.11. Sale of Assets from Block
When assets are sold, discarded, demolished, or destroyed, sale consideration is generally reduced from the relevant block of assets.
Tax consequences depend upon whether the block continues to exist after such reduction.
Sale treatment depends on survival of the block.
Sale treatment depends on survival of the block.C. HALF-YEAR DEPRECIATION RULE
12. Assets Used for Less Than 180 Days
Special depreciation restriction applies where assets are put to use for less than 180 days during the relevant year.
In such situations, only partial depreciation is generally allowed during the year.
This rule commonly affects year-end purchases.
Timing of asset purchase impacts depreciation claim.
Timing of asset purchase impacts depreciation claim.13. Importance of Put-To-Use Concept
Mere purchase of asset may not always be sufficient for claiming depreciation.
The asset should generally be used or kept ready for use for business purposes during the year.
This concept frequently becomes a litigation area during assessments.
Usage evidence is extremely important.
Usage evidence is extremely important.D. SPECIAL DEPRECIATION PROVISIONS
14. Additional Depreciation
Certain businesses engaged in manufacturing or specified activities may become eligible for additional depreciation on new plant and machinery subject to prescribed conditions.
This incentive aims to encourage industrial growth and capital investment.
Additional depreciation is an investment incentive provision.
Additional depreciation is an investment incentive provision.15. Depreciation on Motor Vehicles
Motor vehicles used for business purposes qualify for depreciation subject to applicable rates and conditions.
However, personal use component may require proportionate disallowance in specified situations.
Mixed personal-business use requires careful treatment.
Mixed personal-business use requires careful treatment.16. Depreciation on Computers & Software
Computers and specified software generally attract separate depreciation treatment because of rapid technological obsolescence.
Correct classification between computer equipment and general machinery is important.
Technology assets often receive different depreciation rates.
Technology assets often receive different depreciation rates.17. Depreciation on Building
Buildings used for business or professional purposes may qualify for depreciation based on their nature and usage.
Different rates may apply for:
- Residential buildings
- Commercial buildings
- Factory buildings
Usage determines depreciation applicability.
Usage determines depreciation applicability.E. BLOCK OF ASSETS CONCEPT
18. Closing WDV of Block
The closing WDV of the block is determined after:
- Adding new asset purchases
- Reducing sale consideration
- Deducting current year depreciation
This closing WDV becomes opening WDV for the next year.
Depreciation is a continuous yearly process.
Depreciation is a continuous yearly process.19. Block Ceases to Exist
Special tax treatment may apply where all assets within a block are sold or the block ceases to exist.
In such situations, balancing adjustments and Capital Gains provisions may become relevant.
Complete sale of block changes tax treatment.
Complete sale of block changes tax treatment.20. Capital Gain on Depreciable Assets
Depreciable assets may attract special Capital Gains provisions upon sale.
Even long-held assets may sometimes result in Short-Term Capital Gain treatment because of block-based taxation mechanism.
Depreciable asset taxation has special rules.
Depreciable asset taxation has special rules.F. PRACTICAL COMPLIANCE & REPORTING
21. Depreciation in Tax Audit
Tax auditors commonly verify depreciation computation, asset classification, and additions/deletions during audit proceedings.
Improper classification or unsupported claims may result in disallowances.
Fixed asset records are extremely important.
Fixed asset records are extremely important.22. Asset Register Maintenance
Businesses should maintain proper Fixed Asset Registers for supporting depreciation claims.
Important details generally include:
- Asset description
- Purchase date
- Invoice details
- Location of asset
- Depreciation rate
Proper records reduce future disputes.
Proper records reduce future disputes.23. GST & Depreciation Interaction
Where GST Input Tax Credit is claimed on capital assets, depreciation treatment of GST component requires careful evaluation.
Double benefit situations are generally restricted under tax provisions.
GST treatment impacts asset cost computation.
GST treatment impacts asset cost computation.24. Common Mistakes in Depreciation Claims
Taxpayers frequently make errors while computing depreciation due to incorrect classification or procedural lapses.
Common mistakes include:
- Wrong depreciation rate
- Claim without actual usage
- Incorrect asset classification
- Ignoring half-year rule
- Double claim of GST component
Such mistakes may result in additions during assessment.
Accurate asset classification is essential.
Accurate asset classification is essential.25. Practical Guidance
Businesses should plan capital expenditure carefully while considering depreciation impact and tax efficiency.
Periodic review of fixed assets and depreciation schedules improves compliance quality.
Best practices:
- Maintain detailed asset register
- Preserve purchase invoices
- Verify depreciation rates annually
- Track put-to-use dates carefully
- Reconcile books with tax depreciation
Strong asset management improves tax compliance.
Strong asset management improves tax compliance.26. Comparative Snapshot
Method
WDV Method
Basis
Block of Assets
Tangible Assets
Eligible
Intangible Assets
Eligible (specified cases)
Less than 180 days usage
Partial depreciation
Personal use assets
Restricted deduction
Depreciation depends heavily on asset usage and classification.
Depreciation depends heavily on asset usage and classification.27. CABTA Insight
“Depreciation is not merely an accounting adjustment — it is a powerful tax planning and compliance tool.”
At Brijesh Thakar & Associates, we advise clients on accurate income computation and return filings.
Disclaimer
The information contained in this article is for general informational purposes only and does not constitute legal, tax, or professional advice. Each case requires specific evaluation based on facts and applicable laws. Readers are advised to seek professional advice before taking any action.
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