What are the 5 major sources of revenue for the government?

The 5 major sources of revenue for the Government are Goods and Services Tax (GST), Income tax, corporation tax, non-tax revenues, union excise duties . You can read about the Taxation System in India – Types, GST, VAT, Objectives, Limitation in the given link.

Further readings:

1. Previous Years Economics Mains Questions in UPSC Civil Service Exam, General Studies Paper – 3
2. Economics Notes For UPSC IAS Examination