The plant and machinery depreciation rate determines how much value business assets lose over time for tax purposes under the Income Tax Act. Depreciation spreads the cost of machinery, equipment and tools over their useful life, helping businesses reduce taxable income while remaining compliant.
What is plant & machinery depreciation?
Plant and machinery depreciation is the deduction allowed on business assets under tax laws. It is calculated as a percentage of the asset’s value each year and reduces the business’s taxable income. This deduction applies only when the asset is owned and used for business purposes.
Plants and machinery include equipment, tools, electrical systems and production machines. Land is not eligible for depreciation. Assets such as cars, office furniture, buildings or computers have their cost spread over time rather than claimed in a single year.
Why depreciation is important to businesses
Depreciation affects tax, reporting and financial planning. It offers the following benefits:
- Reduces tax liability: Lowers taxable income and overall tax outgo.
- Improves profit reporting: Reflects the true cost of asset use over time.
- Supports financial planning: Helps plan asset replacement and capital expenditure.
- Ensures compliance: Meets depreciation requirements under tax laws.
- Improves cash flow: Reduces tax liability without actual cash outflow, indirectly improving cash flow.
How is depreciation on plant & machinery calculated?
In India, depreciation is computed using the Written Down Value (WDV) method, in which the asset’s value decreases each year by the amount of depreciation applied.
Key rules include:
- Written-down value method: Depreciation is calculated on the remaining asset value after prior depreciation.
- Block of assets concept: Similar assets are grouped, and a single rate applies to the group. Individual tracking is not required for tax purposes.
- Ownership requirement: The business must wholly or partially own the asset to claim depreciation.
- Usage condition: The asset must be used for business purposes at any time during the year, including trial use. Depreciation depends on whether it is used for more or fewer than 180 days.
- Time-based rule: Full depreciation applies if the asset is used for more than 180 days; otherwise, half the rate is allowed.
Depreciation is permitted even if the asset is used for part of the year, subject to the 180-day rule. This approach allows higher depreciation in early years, reducing taxable income sooner and helping businesses manage cash flow effectively.
Plant & machinery depreciation rate in India
Depreciation rates vary depending on the type of asset and its use. Common rates include:
- General plant and machinery: 15% standard rate for most equipment used in business.
- Motor vehicles: 15% when used for business purposes; vehicles used on hire qualify for a higher rate of 30%.
- Vehicles used on hire: 30% for transport or rental service vehicles.
- Computers, including software: 40% due to faster technological obsolescence.
- Special machinery categories: Certain assets, such as energy-saving devices, pollution-control equipment and renewable energy machinery, are subject to specific rates under tax rules.
Additional depreciation on plant & machinery
Businesses may claim additional depreciation on new machinery under certain conditions. Key requirements include:
- Business eligibility: Only businesses engaged in manufacturing or production can claim this benefit.
- New asset: The asset must be new and unused.
- Rate of deduction: 20% of the asset cost can be claimed in addition to normal depreciation.
- Time rule applicability: If the asset is used for less than 180 days, 10% can be claimed in the first year and the remaining 10% in the next year.
Common mistakes when applying depreciation rates

Errors in applying depreciation can create compliance and tax issues. Common mistakes include:
- Wrong rate application: Using an incorrect depreciation rate can lead to errors in tax calculation.
- Ignoring the block concept: Treating assets individually rather than grouping them can lead to miscalculations.
- Missing usage condition: Claiming full depreciation without meeting the usage condition may result in disallowed claims.
- Incorrect asset classification: Placing assets in the wrong category results in the wrong rate being applied.
- Poor record keeping: Lack of proper documentation can create problems during audits or tax assessments.
How to apply plant & machinery depreciation correctly
To apply depreciation accurately, businesses must ensure every step follows tax rules to avoid disallowance or reporting errors:
- Classify each asset correctly: Incorrect classification can result in lower deductions or disallowances during assessment.
- Use the correct depreciation rate: Applying an incorrect rate affects allowable deductions and taxable income.
- Check the usage condition carefully: If the asset is used for less than 180 days, only half the depreciation is allowed.
- Maintain proper records: Inadequate documentation may result in claims being rejected during audits.
- Verify calculations during closing: Errors can lead to incorrect profit reporting and tax computation.
Conclusion
Plant and machinery depreciation directly affects taxable income and helps businesses report profits accurately. Applying the correct rates, following tax rules and maintaining proper documentation prevents errors and compliance issues.
With TallyPrime, businesses can track asset values, record depreciation accurately and generate reports required for audits and tax filings. Start using TallyPrime to manage depreciation efficiently and ensure your records remain compliant.