[Examine how currency depreciation and global commodity price inflation transmit into India's indirect tax revenues.](/upsc-mains-answer/examine-currency-depreciation-global-commodity-price-f0fb659)

India's GST is an ad valorem, destination-based levy under Article 246A [1], so revenue tracks the rupee value of transactions, not real volumes. Consequently, a weaker rupee and imported inflation can lift collections even as domestic output slows — a buoyancy that is nominal rather than real.

Transmission channel 1 — Import IGST and the exchange rate

• IGST is levied on imports on the assessable value in rupees; depreciation of the rupee (roughly 10-12% over the past year, against an RBI/FBIL reference rate near ₹95/$ [2]) mechanically inflates that base.
• Crude oil, electronics, machinery and chemicals form nearly half the import basket, so currency and global price shocks pass directly into IGST [5].
• Result: import IGST grew ~27% year-on-year in July 2026 against only ~4.5% in domestic revenues, within a headline gross collection of ₹2.11 lakh crore (+15.4%) [3][5].

Transmission channel 2 — Price inflation on domestic supplies

• WPI manufacturing inflation rose to 7.18% (June 2026) from 1.52% a year earlier [4][5]; ad valorem GST captures this price rise as revenue growth without any additional output.
• Simultaneously, HSBC PMI showed manufacturing at a five-year low and services growth the slowest in 53 months, confirming the gap between tax buoyancy and real activity [5].

Fiscal and federal implications

• Only 16 States/UTs exceeded the national post-settlement growth average, so import- and inflation-led buoyancy is geographically concentrated, complicating equitable devolution debates in the GST Council (Article 279A) [1][5].
• Revenue that depends on external prices is volatile: commodity softening or rupee stability can reverse it abruptly, weakening budget credibility.

Thus, currency and commodity shocks transmit into indirect taxes through the import base and the ad valorem price base, producing headline strength on a weak real foundation. The way forward is to read GST alongside PMI, IIP and WPI, decompose domestic versus import IGST in official releases, and anchor revenue growth in domestic manufacturing under initiatives such as PLI — so that fiscal federalism rests on genuine productive capacity rather than price effects.