For Salaried, Commission Persons
Salary and commission income are taxable under Income from Salary or Income from Other Sources, depending on the nature.
For Business Persons
Business income is taxed under the head "Profits and Gains of Business or Profession."
For Corporates
Companies are taxed under the head "Profits and Gains of Business or Profession" with fixed tax rates.
For Anymore Organisations
NGOs, Societies, and Trusts can claim exemption u/s 12A & 80G, but only if registered with the Income Tax Department.
Auditing and Accounting
Tax Audit (u/s 44AB) is mandatory if turnover exceeds ₹1 Cr (business) or ₹50 Lakh (profession), unless under presumptive taxation.