The Seven Classes of revenue leakage
The Index is built on Terra Insight's leakage taxonomy — the same framework that anchors the Stop Revenue Leakage pillar. Seven classes is the minimum vocabulary required to make leakage a managed category rather than a residual write-off. You cannot recover what you have not classified.
Unrecovered TDS credits
TDS deducted by customers under the 2026 regime — Sections 393, 394, 413 and payment codes 1001–1092 — that never lands in Form 26AS or the new Form 168/131/141 within the correction window. Dual-clock exposure during FY 2026-27 cross-era reconciliation.
Lapsed input tax credit
ITC reversed under Rule 36(4) and Rule 37, lost to supplier non-filing, or rejected at the IMS gate. The most measurable single leakage class because the GSTR-2B vs books delta is computable line by line — when anyone bothers to compute it.
Platform fee and settlement errors
Aggregator commission rate drifts, double-deducted MDR, and order-level fee inversions inside Razorpay, PayU, Cashfree, Amazon, Flipkart, Meesho and marketplace SoR payouts. Invisible to ledger-level reconciliation by design.
Settlement disputes that age out
OEM debit-note short-pays in auto components, NACH returns mis-posted against the wrong mandate, partial settlements closed as full. The recovery window closes silently; the variance becomes a write-off line.
Inventory reconciliation gaps
Free-issue steel in auto Tier-1 supply, job-work deemed-supply under GST, three-way-match exceptions that resolve into "process loss" rather than financial recovery. Concentrates in manufacturing and auto components.
Working capital locked by recon delay
Money that will eventually arrive — but funds a month or quarter of cost-of-capital while it does. Treasury rarely attributes this back to the reconciliation function; the cost lives in the interest line of the P&L.
NACH bounce + statutory penalty
Sponsor-bank bounce charges never reconciled against recovery, plus interest at 1.5% per month on late TDS deposit, 18% per annum on unsupported ITC, and the Section 43B(h) MSME 45-day disallowance. Avoidable statutory cost is the leakage class with the highest unit economics of recovery.
Methodology
How the Index is constructed. We publish the method first because the method is the asset — a leakage number you cannot reproduce is a marketing number, not a research number.
Public regulatory data sources
CBDT direct-tax statistics, GST Council releases and CBIC monthly collections, RBI bulletin payment-system data, NPCI public NACH and UPI statistics. These set the macro envelope inside which leakage occurs; they do not directly measure it.
Industry segment scope
The Index covers the 24 industry segments Terra Insight maintains presets for — MSME services, manufacturing (auto components, electronics, FMCG), retail/D2C, healthcare (TPA cycle), banking, NBFC lending, SaaS / IT services, hospitality, logistics, and the CA-firm channel.
Sampling discipline
Terra Insight does not publish customer-specific data. All segment-level observations are aggregated patterns drawn from customer engagements and de-identified across organisations, volume buckets, and time windows. No individual customer is identifiable from any number in this Index.
Computation framework
Seven leakage classes × industry segment × volume bucket → leakage incidence rate. The unit is the share of reconciliation cycles in which a given class produces material variance — not a rupee total. Incidence rates compose with public industry size only where the underlying segment statistic is itself public.
What this Index does NOT do
It does not claim a single "₹X lakh crore lost industry-wide" number. Responsible measurement of industry leakage requires primary statistical sampling across a representative panel of organisations — not a vendor estimate. The Index measures patterns and incidence. The rupee total is each organisation's to compute on its own data.
Why we don't publish a single ₹ number
A credible industry-wide leakage rupee total requires statistical primary sampling across a representative panel of Indian organisations — stratified by size, sector, and ERP stack — with disclosed sampling error. No vendor possesses that panel today, including us. The Index measures patterns and incidence so that each organisation can compute its own rupee number using its own data and the Seven Classes vocabulary. When the panel exists, the Index will publish the rupee total. Until then, the absence of a number is the integrity claim.
2026 edition observations
Five high-impact observations from the 2026 reconciliation cycle. Each is qualitative — a measured shift in leakage shape, not a fabricated industry rupee total.
TDS migration creates a dual-clock leakage window
FY 2026-27 is the cross-era year. Sections 393, 394, 413 and the new payment code grid (1001–1092) run alongside legacy 194-series sections still appearing in old 26AS rows and the new Form 168/131/141. Reconciliation engines that match on section-string-equality (rather than mapped payment code) silently drop the cross-era credit. The leakage class is permanent loss once the correction window closes.
GST IMS adoption remains the largest lapsed-ITC vector
Public CBIC IMS dashboard adoption data shows usage well below 60% of eligible taxpayers in the small-business segments. ITC continues to lapse at the Rule 36(4) gate from suppliers who have not filed and at the IMS gate from invoices the recipient never acted on. The fix is procedural, not technological — which is why the leakage persists.
MSME 43B(h) compliance lag continues
The 45-day mandatory-payment window for registered micro and small enterprises is enforced unevenly across mid-corporate buyers. Payable ageing past 45 days remains a primary leakage class — disallowed in the buyer's P&L and quietly under-pursued by the supplier. The Index treats 43B(h) ageing as a Class-04 settlement leakage subtype.
Auto-component OEM debit-note opacity
Tier-1 auto component suppliers consistently report OEM debit notes — quality rejection, logistics short-receipt, free-issue steel variance — as the largest unresolved variance category. The 2026 TDS regime adds new complexity: payment codes 1002 and 1071 introduce audit clarity for OEM payments but require explicit mapping on the supplier side. India's auto component industry — ₹6.73 lakh crore in annual turnover — is the highest-stakes vertical the Index covers.
AA payload vs PDF accuracy delta in NBFC lending
Account Aggregator payloads still underperform PDF parsing on co-operative and PSU bank statements, where normalisation gaps in narration patterns translate directly into bounce-prediction and salary-consistency signal noise. Pure-AA lending pipelines underperform on MSME unsecured underwriting — which is why the ₹65 lakh crore MSME credit demand gap is structurally addressable by reconciliation infrastructure that handles both channels.
Industry-segment snapshot
The leakage shape by segment — which classes dominate, which reconciliation cycles concentrate the variance. Qualitative pattern; no fabricated rupee totals.
Auto Components
Leakage classes 4 (settlement) and 5 (inventory) dominate. OEM debit-note opacity, free-issue steel variance, and the new Section 393/394 cross-era mapping define the 2026 reconciliation shape for Tier-1 suppliers.
NBFC Lending
Class 1 (unrecovered TDS under Section 194A reclassifications) and the AA-payload normalisation gap on co-operative and PSU banks. Bounce-prediction signal coverage on MSME unsecured underwriting remains the structural differentiator.
Manufacturing
Three-way-match exception rates of 60–75% are typical for mid-corporate manufacturing before reconciliation infrastructure is deployed. TDS Section 393/394 cross-era reconciliation compounds the variance.
D2C / E-commerce
Platform settlement (class 3) and COD float (class 6) define the leakage shape. Aggregator commission-rate drift across Razorpay, PayU, Cashfree, Amazon, Flipkart and Meesho is the dominant fee-error vector.
Healthcare
TPA settlement opacity (Ayushman, CGHS, ECHS, private cashless) and the IRDAI-regulated cashless cycle. Class 3 (fee/deduction errors at TPA payout) and class 6 (working capital lock) dominate.
SaaS / IT Services
Section 413 (foreign payments under the 2026 regime), Ind AS 115 deferred revenue reconciliation, and 26AS vs books delta on multi-currency receivables. Smaller absolute leakage, higher incidence rate.
Coverage extends across all 24 Terra Insight industry presets. See the full industry directory for the segments not summarised above.
The Terra Insight stance
Why we measure. Leakage is invisible until it is classified. A write-off line called "reconciliation adjustments" is the formal forgiveness of money the organisation legitimately earned. The Seven Classes framework names what was nameless — and once a class has a name, it has an owner, an exception register, and a recovery window. The Index is the discipline of measuring the named classes year over year.
Why we publish annually. Leakage is not static. The 2026 TDS regime rewrites the cross-era reconciliation map. GST IMS adoption is moving. Account Aggregator coverage on co-operative banks is improving. MSME 43B(h) enforcement is tightening. Every year shifts the leakage shape — which class dominates, which segment concentrates the variance, which control is now table stakes. An annual cadence is the only honest one: a one-off report freezes a moving picture and pretends it is the truth.
Methodology partners — call for the 2027 edition
The 2027 edition will publish on a wider observation panel. Organisations — finance teams, internal audit functions, CA firms, NBFC credit operations, industry associations — are invited to contribute de-identified data to the panel.
What we ask for
De-identified variance summaries by leakage class, mapped to your industry segment and volume bucket. No transaction-level data. No PII.
What you get
Pre-publication access to your segment's leakage profile against the panel median. The ability to benchmark your reconciliation discipline against peers.
Security posture
ISO 27001:2022 certified. Hosted in AWS Mumbai. DPDP Act 2023 aligned. Contribution handled under mutual NDA with named retention windows.
Quantify your own leakage today
The Index measures the pattern. Your data measures the rupees. Start with the Revenue Leakage Calculator for a combined estimate, then move into TransactIG for line-level recovery — or talk to us about NBFC-lending and MSME-lending solutions if you are on the credit-decisioning side of the leakage map.