Expenditure: where the money goes. Spending divides on a distinction you must internalize, because it recurs everywhere: spending that creates a future asset or productive capacity versus spending that is consumed in the present.
- India draws the line as capital expenditure (capex: building roads, railways, ports, defense equipment, and loans to states for their own capex) versus revenue expenditure (recurring spending that creates no asset, such as salaries, pensions, defense operating costs, and above all interest payments and subsidies: food, fertilizer, and cooking fuel). Two revenue-expenditure lines deserve to be seared into your memory because they dominate India's fiscal story. Interest payments are typically the single largest expenditure line in the Union Budget, on the order of a quarter of total spending and roughly 40% of the Centre's revenue receipts go simply to servicing past debt (illustrative, modeled on recent budgets; pull the actual Receipt/Expenditure Budget). That is the ghost of past deficits eating today's revenue, and it is exactly why the primary deficit is the number that reveals today's true stance. Subsidies are the second political heavyweight. India's recent policy emphasis has been a deliberate "capex push", raising the share of capital spending on the argument (which you will quantify in the fiscal multiplier page) that the multiplier on public investment is far larger than on revenue spending.
- United States draws a different, equally important line: mandatory spending versus discretionary spending versus net interest. Mandatory spending is the entitlements, meaning Social Security, Medicare and Medicaid, paid automatically to anyone who qualifies under existing law. It is not voted on each year and it is the largest and fastest-growing block, driven by demographics (an aging population). Discretionary spending is what Congress appropriates annually, split into defense and non-defense; it is the part politicians actually debate, and it is a shrinking slice of the whole. Net interest is the US analogue of India's interest-payments line, and it has become the fastest-rising item of all: as of the mid-2020s US net interest has grown to roughly 3% of GDP and has overtaken the entire defense budget (approximately $0.9 trillion and climbing; check against the Monthly Treasury Statement). The US and India, from opposite structures, have arrived at the same sobering place. The cost of yesterday's borrowing is now one of the largest things the government buys.