Depreciation is calculated using different methods based on how an asset loses value over time, directly affecting profit reporting and tax liability. Businesses commonly use methods such as the straight-line method, written-down value method, units-of-production method and sum-of-years’ digits method, each suited to different asset types and usage patterns.
How to calculate depreciation using the Straight Line Method (SLM)?
The Straight Line Method assumes that an asset loses value evenly over its useful life, making it suitable for assets like furniture or buildings that are used consistently. Under the Companies Act 2013, many organisations adopt SLM for such assets.
Annual Depreciation = (Cost of Asset - Salvage Value) / Useful Life
How to calculate depreciation using the Written Down Value (WDV) Method?
The Written Down Value (WDV) method applies a fixed depreciation rate to an asset's remaining value each year. Under the Income Tax Act 1961, it is commonly used for most asset classes (except power-generating undertakings).
Depreciation = Opening Written Down Value × Rate of Depreciation
This method results in higher depreciation in the initial years, which gradually reduces over time. In the early life of an asset (such as a new CNC machine), maintenance costs are typically low while depreciation is higher, helping balance the overall cost of ownership.
How to calculate depreciation using the Units of Production Method?
The Units of Production Method calculates depreciation based on actual usage rather than time, making it suitable for assets where output determines wear and tear, such as a printing press.
Depreciation = (Cost of Asset − Salvage Value) ÷ Total Estimated Units × Units Produced During the Year
Here, a depreciation rate per unit is determined and then multiplied by the actual production during the year, ensuring the expense reflects real usage.
How does depreciation affect taxable income and cash flow for an Indian business?
Depreciation acts as a tax shield by reducing taxable profit under the Income Tax Act 1961. It is treated as a non-cash expense, which lowers ‘Profit Before Tax’ without affecting actual cash outflow.
For example, if a business earns ₹10 lakh before depreciation and claims ₹2 lakh as depreciation, tax is calculated on ₹8 lakh. At a 25% tax rate, this results in a cash saving of ₹50,000.
Conclusion
Depreciation directly shapes how a business reports profit, manages tax liability and plans asset use, making it a practical financial decision rather than just an accounting formality. Selecting the right approach, such as SLM or WDV, helps ensure accurate reporting, better tax efficiency and compliance with Indian regulations.
TallyPrime simplifies this process by automating depreciation calculations alongside GST and overall accounting, ensuring consistent, accurate records. This allows businesses to stay compliant, make informed decisions and manage finances with greater clarity as they grow.
