Apportionment of deductions clarifies business use limits and streamlines depreciation rules under the new income tax framework.
Clause 28 limits deductions for rent, local taxes, insurance and repairs to amounts wholly and exclusively for business use and permits apportionment by the Assessing Officer where use is mixed; Clause 33 creates a structured depreciation regime for tangible and intangible assets (excluding goodwill) including block of asset calculations, special provisions for new machinery and power generation assets, short use treatment, and rules on successor transactions.

Deductions for rent and repairs clarified: proportionate claims allowed for partial business use under new clause.
Clause 28 consolidates deductions for premises, machinery, plant, and furniture used wholly and exclusively for business or profession, allowing deductions for insurance premiums, local taxes, rent, and current (non-capital) repairs. It preserves tenant-specific rent and repair claims and imposes an explicit apportionment rule: where assets are not wholly used for business, deductions are limited to a fair proportionate part as determined by the Assessing Officer, thereby centralising assessment discretion and requiring supporting documentation for partial-use allocations.