What is Depreciation? Meaning, Methods & Tax Benefits Explained

Highlights:

• Understand how depreciation systematically allocates asset costs over the useful life while reducing taxable income annually
• Learn the difference between book depreciation (Companies Act, Schedule II — SLM or WDV) and tax depreciation (generally WDV on a block of assets)
• The Income-tax Act generally allows depreciation on the written-down value of a block of assets at prescribed rates; some power undertakings may opt for SLM on actual cost
• Section 32 of the 1961 Act (and the corresponding provision in the 2025 Act) allows depreciation deductions at prescribed rates. Eligible new plant and machinery used in manufacturing or power may qualify for additional depreciation of 20% of actual cost, subject to conditions, exclusions, the 180-day rule, and concessional-tax-regime restrictions
• Analyse why depreciation matters for equity investors evaluating company cash flows, profitability, and deferred tax

Introduction

Buying machinery or property involves high upfront costs, but their value doesn’t vanish overnight. Depreciation spreads these costs across years, matching expenses to the periods when assets generate revenue. For investors and business owners in India, understanding depreciation unlocks tax savings and sharper financial analysis. This guide covers depreciation meaning, calculation methods, and practical tax benefits.

What is Depreciation? Understanding the Basics

Depreciation systematically allocates the cost of tangible assets over their useful life. Under the Companies Act 2013, Schedule II, depreciation is prescribed for financial reporting purposes. Rather than expensing the entire purchase price upfront, depreciation spreads it annually, matching costs with revenue generation periods. This accounting treatment reduces reported profits each year without actual cash outflow, creating a deduction under the Income Tax Act that lowers taxable income whilst preserving working capital.

For tax purposes, a separate computation applies. The Income Tax Act allows a deduction for depreciation on eligible assets owned and used for business or profession. That deduction lowers taxable income. Because depreciation is a non-cash charge, it can improve after-tax cash retention compared with an equivalent cash expense — it does not by itself create cash or “preserve working capital” beyond the tax it defers.

Why Depreciation Matters for Indian Investors

Depreciation is a non-cash expense affecting reported profits but not cash flow. When analysing companies, investors must distinguish between accounting profit and actual cash generation. A manufacturing firm showing lower profits due to high depreciation might still generate strong operating cash flow. Metrics like EBITDA (Earnings Before Interest, Tax, Depreciation, and Amortisation) add back depreciation to reveal true earnings power.

Book depreciation (Companies Act / Ind AS) and tax depreciation almost always differ. Tax rules use blocks of assets, prescribed WDV rates, a 180-day half-rate rule, and, in eligible cases, additional depreciation. Book rules use useful lives under Schedule II and either SLM or WDV on individual assets. The gap is a timing difference and typically creates deferred tax on the balance sheet under Ind AS 12. This distinction helps equity investors assess whether a company’s fundamentals justify its valuation, particularly in capital-intensive sectors like infrastructure or manufacturing.

Methods of Depreciation in India

Do not treat SLM and WDV as interchangeable for tax.

Books (Companies Act 2013, Schedule II)

Companies generally depreciate each asset (or component) over its useful life, with residual value commonly taken as 5% of cost unless a different residual is justified. Either SLM or WDV may be used for financial statements.

Straight-Line Method (SLM) charges equal depreciation annually. Calculate it by dividing the asset cost minus the residual value by the useful life in years. A ₹10 lakh machine with a ₹1 lakh residual value and a 10-year life depreciates by ₹90,000 yearly (₹9 lakh ÷ 10 years).

Written Down Value (WDV) applies a depreciation rate on a reducing balance, resulting in higher charges initially and lower amounts later.

Tax (Income-tax Act)

For most taxpayers, tax depreciation is computed only on the WDV method, on a block of assets that share the same class and the same prescribed rate, not asset by asset, and not by subtracting a residual value from cost. General plant and machinery is commonly depreciated at 15% WDV; computers and computer software at 40%; furniture at 10%; non-residential buildings at 10%; residential buildings at 5%; specified intangibles at 25%. Always check the current rate table for the correct block.

Power-generation undertakings may opt for SLM on actual cost for specified assets; that is an exception, not the general rule.

If an asset is acquired and put to use for less than 180 days in the year of acquisition, only 50% of the applicable tax depreciation (including 50% of additional depreciation, where eligible) is allowed in that year.

Depreciation and Tax Benefits Under the Income Tax Act

Section 32 of the Income Tax Act, 1961 allowed depreciation on depreciable business assets, including certain tangible and intangible assets, at prescribed rates. From 1 April 2026, the Income-tax Act, 2025 applies; the depreciation framework has been restated under the corresponding provision of the new Act (commonly referred to in commentary as Section 33 or Section 34). Rates, the block-of-assets concept, and the WDV method are largely unchanged. Existing WDV balances as on 31 March 2026 generally carry forward.

These rates vary by asset class and usage. Depreciation reduces taxable income and can significantly lower tax liability. Depreciation is treated as allowed even if not claimed; the block’s WDV is reduced in any case. Unabsorbed depreciation can be carried forward, subject to the act in force.

Manufacturing or power generation, transmission or distribution businesses may also qualify for additional depreciation (previously Section 32(1)(iia)) on eligible new plant and machinery, subject to the conditions in the law. The standard extra allowance is 20% of actual cost (10% in the year of acquisition if used for less than 180 days, with the balance in the next year). Typical exclusions include second-hand assets, ships, aircraft, office appliances, road transport vehicles, and plant installed in an office, residence or guest house. Additional depreciation is generally not available to taxpayers who have opted for specified concessional tax regimes. The old 35% backward-area incentive for assets installed between 1 April 2015 and 31 March 2020 has expired. This can accelerate tax savings in the early years of a project and improve cash flow during expansion where the conditions are met.

Books vs Tax at a Glance

Practical Example: Calculating Depreciation

Book example (SLM, Schedule II-style): Consider purchasing ₹5 lakh of machinery with a 10-year useful life and a ₹50,000 residual value.

Annual book depreciation = (₹5,00,000 − ₹50,000) ÷ 10 = ₹45,000 yearly.

Tax illustration (individual asset shown only to explain the rate; in practice the figure enters the plant-and-machinery block): Assume general plant and machinery at 15% WDV, put to use for the full year, and ignore other assets in the block.
Year 1 tax depreciation = ₹5,00,000 × 15% = ₹75,000.
Year 2 tax depreciation = (₹5,00,000 − ₹75,000) × 15% = ₹63,750.

If the same machine is put to use for fewer than 180 days, Year 1 normal tax depreciation is 7.5% (₹37,500), not 15%.

If the business is an eligible manufacturer or power concern, additional depreciation of 20% of actual cost (₹1,00,000) may also be available in Year 1 if used for 180 days or more, or 10% in Year 1 and 10% in Year 2 if used for fewer than 180 days, subject to exclusions and regime restrictions.

WDV tax rates front-load deductions relative to a typical book SLM charge. You generally cannot elect SLM for tax merely because it suits cash-flow planning. Use the method required for books and the method mandated for tax, then plan acquisitions (including timing before the 180-day cut-off) around the tax rules.

Key Insight for Smart Investors

Depreciation bridges accounting rules and tax strategy, turning asset purchases into multi-year tax shields where the asset is eligible. For investors, recognising depreciation’s non-cash nature sharpens company analysis; adding it back reveals operating cash flow before this charge. Also separate book depreciation from tax depreciation and watch deferred tax. For business owners, leveraging prescribed block rates and additional depreciation where legally available reduces tax bills without a matching cash expense. Master depreciation mechanics to make informed investment decisions and optimise tax planning.

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