Tax Buoyancy
Measuring GST's Revenue Performance Against the Economy
Tax buoyancy measures how responsive tax revenue growth is to growth in nominal GDP, calculated as (% change in tax revenue) ÷ (% change in nominal GDP). A buoyancy greater than 1 means revenue is growing faster than the economy — typically attributed to improved compliance, base-widening, or administrative efficiency rather than rate increases; a buoyancy below 1 signals leakage, exemptions, or under-recovery.
- GST is estimated to have raised the buoyancy of India's indirect tax system to around 1.22, compared with roughly 0.72 for the pre-GST indirect tax regime — evidence cited for GST's structural gain in compliance and formalisation.
- A buoyancy above 1 is the technical basis for describing GST collections as growing "faster than nominal GDP," the framing used to characterise the July 2026 surge.
- Buoyancy is distinct from tax "elasticity," which isolates the automatic response of revenue to GDP growth net of discretionary changes like new tax measures or rate revisions.
● Tracked since April 02, 2026 · last seen August 04, 2026 · updates as the daily brief publishes
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