Here is a quick look into the technicalities of the budget.
1) Budget is the annual financial statement of the nation. According to Article 112 of the Constitution of India, the Union Budget of a year is a statement of the estimated receipts and expenditure of the government for that particular year.
2) Budget is made through a consultative process involving ministry of finance, NITI Aayog and spending ministries.
3) The ministries & departments send in their demands after which extensive consultations are held between Union ministries and the Department of Expenditure of the finance ministry.
4) Department of Economic Affairs and Department of

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