India's interest bill: the invisible budget

Before the government builds a road, runs a school, or pays a soldier, it must pay interest on money it borrowed to build yesterday's roads, run yesterday's schools, and pay yesterday's soldiers.

In FY 2026-27, that interest bill is ₹13.35 lakh crore — the single largest line item in the Union Budget, larger than defence (₹6.97L Cr), larger than education (₹1.49L Cr), and larger than health (₹98,311 Cr) combined. It consumes 24.9% of all tax and non-tax receipts.

Every rupee of new spending must first clear this floor.

How the debt stock grew

India's central government debt has compounded across four distinct episodes:

| Period | Driver | |--------|--------| | 1985–1991 | Unsustainable deficit spending; balance of payments crisis | | 1998–2003 | Fifth Pay Commission arrears + defence after Pokhran | | 2008–2013 | Post-GFC fiscal stimulus; food, fuel, fertiliser subsidies | | 2020–2022 | COVID-19 collapse in revenue; emergency expenditure surge |

The outstanding liabilities of the Central Government reached approximately ₹183 lakh crore by end-FY25 — around 57% of GDP. That sounds alarming until you note that Japan's government debt is 250% of GDP and the US runs at 120%. But the comparison obscures something important: India's primary fiscal position. Even excluding interest payments, India runs a small deficit. The interest-to-revenue ratio is what matters.

Who actually owns the bonds?

The Reserve Bank of India is the government's debt manager. It conducts G-sec (government securities) auctions every week during the borrowing season. The universe of buyers:

Commercial banks hold the largest share — approximately 37% of outstanding G-secs. This is partly mandatory (banks must hold a minimum "Statutory Liquidity Ratio" of government securities equal to 18% of net demand and time liabilities) and partly voluntary.

Insurance companies and provident funds hold roughly 24%. LIC alone owns more Union government debt than most foreign investors. When you pay an LIC premium, a portion buys G-secs.

RBI itself holds about 15-18% at any given point — a residual from Open Market Operations (OMO), where the RBI buys G-secs to inject liquidity. This is the mechanism critics call "printing money," though it is more accurately "monetising debt through secondary market operations."

Foreign portfolio investors (FPIs) hold approximately 2-3% — historically limited by RBI's strict caps, though the inclusion of Indian G-secs in the JP Morgan EM Bond Index (from June 2024) is beginning to change this. India expects $25–30 billion in passive inflows from index inclusion over the next 18-24 months.

Retail investors hold a negligible share directly, though this is the RBI's long-term ambition via its RBI Retail Direct platform.

The yield the government pays

The 10-year benchmark G-sec yield has ranged from 6.8% to 7.4% over the past three years. With ₹183 lakh crore of outstanding stock, even a 10 basis-point rise in the average cost of borrowing adds roughly ₹18,000 crore to the annual interest bill.

The government refinances approximately ₹12-14 lakh crore of maturing debt each year — far larger than the net new borrowing figure in any budget. Every week's G-sec auction is partly refinancing old debt, partly raising new money.

The real constraint: interest-to-revenue

The ratio to watch is interest payments as a share of own tax revenue (excluding cesses and surcharges, excluding state share):

| FY | Net Tax Revenue (₹ Cr) | Interest Payments (₹ Cr) | Interest/Revenue | |----|------------------------|--------------------------|-----------------| | 16-17 | 9,02,925 | 5,23,078 | 57.9% | | 20-21 | 7,42,882 | 6,92,900 | 93.3% | | 22-23 | 14,16,297 | 8,44,282 | 59.6% | | 24-25 | 16,24,000 (est.) | 11,62,000 | 71.5% | | 26-27 | 17,75,000 (BE) | 13,35,000 | 75.2% |

Net tax revenue = gross tax revenue minus states' share (devolution) and cesses.

In FY20-21, at the pandemic trough of tax revenue, the government was spending 93 paise per rupee of tax collected purely on interest. That is the nightmare scenario. We have pulled back from it, but the trajectory is not comfortable.

Why cutting the deficit is harder than it looks

The Fiscal Responsibility and Budget Management (FRBM) Act, amended in 2018, originally targeted a fiscal deficit of 3% of GDP. The government suspended this target during COVID and is now on a glide path back to 4.5% by FY26 and 4.4% in FY27.

The problem: primary balance vs. headline deficit. The primary deficit (fiscal deficit minus interest payments) for FY26-27 is approximately 1% of GDP. India is, in a sense, running a small primary deficit — it covers its interest bill and then some through borrowing, but is generating just enough primary surplus to gradually stop the debt-to-GDP ratio from rising.

This is arithmetically stabilising, but only just. If nominal GDP growth stays above the interest rate on debt (which requires growth + inflation > weighted average borrowing cost), the debt ratio declines slowly on its own.

What higher debt service crowds out

The brutal accounting: every additional rupee spent on interest is a rupee unavailable for everything else.

In FY2026-27:

Interest payments: ₹13.35L Cr
Capital expenditure (roads, rail, defence, infrastructure): ₹11.21L Cr
Education + Health + Agriculture combined: ~₹4L Cr

India spends 19% more servicing its debt than building all of its physical infrastructure. This is the fiscal constraint that shapes every other budget decision — why health spending at 0.36% of GDP remains among the lowest globally, why states must fund their own capex primarily through their own borrowings, and why ambitious schemes often get announced but underfunded.

What's changing: the J.P. Morgan effect

From June 2024, Indian government bonds are being phased into the JP Morgan Government Bond Index — Emerging Markets (GBI-EM). India's weight will reach 10% by March 2025. This creates an estimated $25-30 billion in passive demand from index-tracking funds.

The consequence: a modest but meaningful expansion in the foreign investor base, which could put gentle downward pressure on G-sec yields. Even a 15-20 basis-point reduction in the 10-year benchmark is worth ₹25,000-30,000 crore in annual interest savings — roughly the entire budget of the PM Awas Yojana (urban).

It is not a silver bullet. But for a government managing an ₹183 lakh crore debt stock, every basis point matters.

Data: RBI Annual Report 2025, Handbook of Statistics on Indian Economy 2024, Union Budget 2026-27 Expenditure Budget Vol. 1, Ministry of Finance. Interest-to-revenue calculations based on gross tax revenue minus state share and cesses.