Special deductions for undertakings in special category states allow staged profit exemptions depending on commencement and expansion timing. Tax deductions are allowed for profits of undertakings or enterprises that begin manufacturing or undertake substantial expansion in designated zones or special category States within specified timeframes, provided they meet formation and asset-use conditions. The deduction rate varies by location and timing-full deduction for initial years in some categories, then reduced rates in others-with initial assessment year tied to commencement or completion of expansion and substantial expansion defined as a fifty percent increase in plant and machinery book value. Overlap with certain other tax benefits is prohibited and eligible zones are to be notified by the tax authority.