Deduction for depreciation: statutory framework limits and special incentives for qualifying business assets under the tax code.

Section 33 provides for deduction for depreciation on tangible and specified intangible assets used wholly and exclusively for business or profession, excluding goodwill; it prescribes computation by blocks and prescribed rates, applies special rules for power undertakings and leasehold improvements, imposes a 50% restriction for assets first used less than 180 days, allows an additional first-year deduction for qualifying new plant and machinery subject to strict conditions, and prescribes pro rata allocation and ceilings on claims in succession, amalgamation or demerger with carry-forward rules for unallowed depreciation.

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