Discuss the challenges in measuring the informal/formal services sector output in India.

Services generate nearly 53% of India's Gross Value Added, yet until the Index of Services Production (ISP, base year 2024-25) the sector had no monthly output tracker comparable to the Index of Industrial Production [1]. Measurement, not the sector's size, remains India's statistical weak link.

Challenges in measuring formal services output

• Absent high-frequency benchmark: industry has had the IIP for decades; ISP trial indices began only in July 2026, covering 19 sub-sectors and about 60% of the services sector [3].
• Value-to-volume conversion: services output is recorded in value terms and must be deflated using WPI and relevant CPI-based deflators, which capture service prices imperfectly [3].
• Extreme heterogeneity: over 40 sub-sectors — trade, transport, banking, insurance, telecom, real estate, professional and recreational services — share no common physical unit of output [2].
• Dependence on administrative data: ISP relies on aggregated GST returns and sectoral datasets (railways, aviation, banking); coverage is therefore bounded by registration thresholds, and confidentiality bars unit-level use [2].
• Reporting lag: monthly release comes with roughly a 60-day lag, limiting real-time policy use [3].

Challenges in measuring informal services output

• Definitional exclusion: ISP is explicitly an index for the formal sector; unincorporated proprietary and partnership units — the bulk of services employment — fall outside it [2].
• Survey-only coverage: such units are captured mainly through the Annual Survey of Unincorporated Sector Enterprises, which surveyed over 6.5 lakh establishments in ASUSE 2025 but yields annual, not monthly, estimates [4].
• Absence of maintained accounts, seasonal and mobile operations, and frequent birth-death of enterprises make sampling frames outdated and recall-based reporting error-prone [4].
• Formalisation illusion: units migrating into GST can inflate measured formal growth without real output expansion.

ISP and a strengthened ASUSE together mark a welcome shift toward data convergence — reusing administrative data rather than adding survey burden. Widening ISP's sub-sector coverage and statistically integrating it with unincorporated-sector surveys would give services measurement the credibility industrial statistics already enjoy, aligning India's statistical system with an economy that services now lead.