Examine how currency depreciation and global commodity price inflation transmit into India's indirect tax revenues.

Q. Examine how currency depreciation and global commodity price inflation transmit into India's indirect tax revenues. (15 marks, 250-350 words)

GST is an ad valorem, destination-based levy under Article 246A, so revenue tracks the rupee value of transactions, not physical volumes [1]. Consequently, a weaker rupee and imported price inflation can lift collections even when real output stagnates — a transmission channel visible in FY27's GST numbers.

Channel 1: Import IGST and the exchange rate - IGST on imports is charged on assessable value converted at notified rupee rates; a 10–12% depreciation over the past year mechanically inflates that base [2]. - Crude oil, electronics, machinery and chemicals — roughly half the import basket — are dollar-denominated, so depreciation passes straight through [3]. - Result: import IGST grew 26.9% in July 2026 against only 4.5% growth in domestic GST revenue [1].

Channel 2: Commodity price inflation and ad valorem elasticity - Higher global prices raise wholesale prices; WPI manufacturing inflation rose to 7.18% (June 2026) from 1.52% a year earlier [4]. - Since tax = rate × price, this yields price-led buoyancy without volume growth — headline GST rose 15.4% to ₹2.11 lakh crore even as manufacturing hit a five-year low and services growth a 53-month low [1].

Channel 3: Fiscal and federal consequences - Buoyancy becomes externally determined and reversible — rupee appreciation or a commodity price fall would deflate revenue without any domestic slowdown. - Gains are unevenly distributed: only 16 States/UTs beat the national post-settlement growth average, concentrating benefits in port and service hubs [1]. - Import-linked IGST also widens the current account strain even as it flatters the exchequer [3].

Thus depreciation and commodity inflation transmit through the ad valorem base, converting external price shocks into apparent revenue strength. The corrective lies in reading GST alongside PMI, WPI and volume data, deepening import substitution in electronics and energy, and broadening the domestic tax base — so that fiscal capacity rests on domestic production and consumption, the foundation cooperative federalism under Article 279A was designed to strengthen.

(~330 words)

Sources: 1. GST Revenue Collection data, Goods and Services Tax Network / Ministry of Finance — monthly gross GST, domestic vs import IGST split, State-wise post-settlement growth 2. Reserve Bank of India, Reference Rate Archive — rupee exchange rate movement over the past year 3. Ministry of Commerce & Industry, Trade Statistics (Commodity-wise Imports) — composition of import basket; petroleum and electronics import values 4. Office of the Economic Adviser, DPIIT — Wholesale Price Index — WPI manufacturing inflation, June 2026 vs June 2025 5. GST Council — Constitutional provisions (Articles 246A, 279A) — ad valorem, destination-based design and Council's federal structure