The revenue budget consists of revenue receipts of the government (revenues from tax and other sources), and its expenditure.
Revenue receipts are divided into tax and non-tax revenue. Tax revenues are made up of taxes such as income tax, corporate tax, excise, customs and other duties that the government levies.
In non-tax revenue, the government's sources are interest on loans and dividend on investments like PSUs, fees, and other receipts for services that it renders. Revenue expenditure is the payment incurred for the normal day-to-day running of government departments and various services that it offers to its citizens.
The government also has other expenditure like servicing interest on its borrowings, subsidies, etc.
Usually, expenditure that does not result in the creation of assets, and grants given to state governments and other parties are revenue expenditures. The difference between revenue receipts and revenue expenditure is usually negative. This means that the government spends more than it earns. This difference is called the revenue deficit.