Scope 3 Emissions for Service Companies — Material Categories, Calculation, and BRSR Reporting

Why this guide exists

Service-sector entities — IT services, BPO, professional services, financial services, digital-product (SaaS) — have a fundamentally different Scope 3 profile than manufacturing. Most published Scope 3 templates and case studies were built around manufacturing supply chains (raw materials, transport, sold-product use) and don’t translate cleanly to a business model where the largest input is human time, the largest external spend is on cloud / professional services, and the largest direct activity is travel.

This page is the operational walkthrough for service-sector entities preparing a Scope 3 inventory under the GHG Protocol Corporate Value Chain (Scope 3) Standard, sized for the BRSR Principle 6 Leadership disclosure and structured for limited-assurance readiness. It is not a template — the materiality call still rests on the entity’s documented materiality framework.

For service-sector entities, Scope 3 is generally disclosed outside BRSR Core and must be materiality-assessed category by category under the GHG Protocol, with business travel, employee commuting, purchased services, and financed emissions often being the most relevant categories depending on the business model.

Where Scope 3 sits in BRSR

Scope 3 is not part of BRSR Core. The verified BRSR Core text covers Scope 1 + Scope 2 via the GHG emission intensity per revenue attribute under Principle 6 — Scope 3 is excluded from the Core KPI set and therefore from the reasonable-assurance scope.

Scope 3 disclosure sits in the Principle 6 Leadership section of the BRSR Format. Specific question numbering and exact text vary across the BRSR Format versions and amendments — refer to the latest SEBI BRSR Format Annexure II for the precise question reference and current wording. Leadership disclosures are voluntary for the Top 1,000 listed entities, with applicability judgement on specific items.

Value-chain disclosure requirements (including Scope 3) have evolved across multiple SEBI circulars with phased applicability and value-chain partner thresholds (commonly cited in market commentary as covering the top upstream / downstream partners by value with a materiality cut-off, but the specific mechanics have been amended more than once). Entities must refer to the latest applicable SEBI circular for the current effective date, the value-chain partner population mechanics, and the disclosure scope — these have changed across circulars and may change again before the next reporting cycle.

For BRSR Core assurance purposes, Scope 3 disclosed in the Leadership section is outside the BRSR Core KPI assurance set. An entity that has disclosed Scope 3 may request limited-assurance procedures over those numbers as an extended-scope engagement, separate from the prescribed Core mandate.

The 15 GHG Protocol Scope 3 categories — relevance for service entities

The GHG Protocol Corporate Value Chain (Scope 3) Standard divides indirect emissions into 15 categories — 8 upstream and 7 downstream. Not all categories are material for every business model; the entity’s materiality assessment should determine which are reported.

Upstream categories (1-8)

#	Category	Typical relevance for service entities
1	Purchased goods and services	High — cloud / SaaS, professional services, office consumables
2	Capital goods	Moderate — laptops, servers, office fit-out
3	Fuel- and energy-related activities (not in Scope 1 / 2)	Moderate — T&D losses on purchased electricity
4	Upstream transportation and distribution	Low — not a goods business
5	Waste generated in operations	Low to moderate — office waste, e-waste
6	Business travel	High — often largest single category for professional services
7	Employee commuting	High — varies materially with hybrid / remote policy
8	Upstream leased assets	Variable — office leases (often included in Scope 2 instead under operational control)

Downstream categories (9-15)

#	Category	Typical relevance for service entities
9	Downstream transportation and distribution	Low
10	Processing of sold products	Not applicable
11	Use of sold products	High for SaaS — data-centre energy consumed by customers running the software; low for non-product service entities
12	End-of-life treatment of sold products	Low
13	Downstream leased assets	Variable
14	Franchises	Not applicable in most service models
15	Investments	Dominant for financial services — financed emissions; not applicable for non-financial service entities

Material categories for typical service companies

The percentage ranges cited below are illustrative — not authoritative, not benchmarkable, and not a substitute for an entity-specific materiality assessment. They are drawn from observed patterns in publicly disclosed Scope 3 inventories and are included to illustrate that Scope 3 in service businesses tends to concentrate in 3-4 categories rather than spread evenly across all 15. Actual mix and magnitude vary materially by business model, geography, work-arrangement policy, and reporting boundary.

IT services and BPO

• Cat 1 (Purchased goods and services) — cloud infrastructure (AWS, Azure, GCP), SaaS subscriptions, contracted IT services. Commonly a meaningful share of the footprint.
• Cat 6 (Business travel) — client visits, internal travel for distributed teams. Highly variable across reporting years and across entities; pre-pandemic peaks tended to be larger than post-pandemic baselines.
• Cat 7 (Employee commuting) — significantly affected by hybrid / remote policy.

Professional services (consulting, audit, legal)

• Cat 6 (Business travel) — frequently among the largest categories due to client-site work.
• Cat 1 (Purchased goods and services) — research subscriptions, contracted experts, technology platforms.
• Cat 7 (Employee commuting) — varies by office-based vs hybrid policy.

Financial services (banks, NBFCs, insurance, asset managers)

• Cat 15 (Investments / financed emissions) — when measured, frequently the dominant category by a wide margin. Calculation methodology is its own discipline (PCAF Standard is one widely-referenced framework). Indian regulatory expectations are evolving via RBI’s climate-related financial disclosure work and SEBI’s ongoing BRSR amendments.
• All other Scope 3 categories together typically a small fraction of total when financed emissions are included in scope.

SaaS / digital-product entities

• Cat 11 (Use of sold products) — data-centre energy consumed by customers running the product is often material for SaaS, but the choice of how to measure and allocate Cat 11 for a SaaS product is itself a methodology-choice area, not a settled rule. Depends on whether the SaaS provider can attribute its cloud bill to per-customer usage, the allocation key chosen, and the boundary applied.
• Cat 1 (Purchased goods and services) — own cloud infrastructure (where the SaaS runs).
• Cat 6 + Cat 7 — typically smaller for digital-first entities.

The above are illustrative ranges and category orderings, not benchmarks. The materiality call for any specific entity rests on its documented materiality framework applied to its specific operations.

Calculation methods — commonly used approaches for limited assurance

GHG Protocol allows multiple calculation methods per category, with declining typical data quality from primary (strongest) to spend-based (weakest). The notes below describe commonly used approaches observed in service-sector Scope 3 inventories — they are not the only defensible approaches, and the entity’s documented methodology choice is what the assurance partner reviews.

Cat 6 — Business travel: the most commonly used approach is distance-based — extract trip records from the travel management company (TMC) or corporate travel portal, map each segment to a distance estimate, and apply a published emission factor (DEFRA GHG Conversion Factors are widely referenced; IEA factors are an alternative; India-specific factors where available — note CEA grid factors apply to Scope 2 electricity, not travel). Edge cases that the entity’s documented policy resolves: chartered / non-TMC bookings (commonly estimated or excluded with disclosure), accommodation emissions (often estimated separately as room-nights × hotel emission factor), class-of-travel adjustments (economy / business / first-class carry different per-passenger factors per DEFRA).

Cat 7 — Employee commuting: typically distance-based using a commute survey (conducted annually with response-rate disclosure) combined with mode-of-transport assumptions. Hybrid / remote work is an implementation matter rather than a source-defined category — different entities take different approaches: some keep work-from-home energy within Cat 7 (the commuting-equivalent treatment), some apply a leased-asset analogy under Cat 8 (this is itself a contested methodology choice, not an accepted convention), and some exclude WFH energy with disclosure of the basis. None of these is yet settled practice. Whichever choice the entity makes should be documented, applied consistently, and explained clearly in the disclosure footnote alongside a summary of the underlying hybrid-work policy.

Cat 1 — Purchased goods and services: spend-based (₹ spend × emission factor per ₹ from a published database such as the EPA US EEIO, ecoinvent, or India-specific input-output tables where available) is a commonly used starting point. Activity-based (units of cloud compute × kWh per unit × applicable grid emission factor) is more granular for cloud / SaaS where the supplier publishes its own carbon intensity (AWS, GCP, Azure all publish per-region intensity). A common practical approach is hybrid: activity-based for the largest 80% of vendors by spend, spend-based for the long tail.

Cat 11 — Use of sold products: for SaaS, the underlying activity is the customer’s data-centre energy consumption from running the software. The methodology choice — whether to allocate the SaaS provider’s own cloud bill per-customer (more granular when the provider can attribute usage), or apply a top-down estimate based on total cloud spend × emission factor allocated by some key (revenue, active users, compute units) — is a methodology decision area, not a settled convention. The chosen allocation basis should be documented, applied consistently, and disclosed.

Cat 15 — Investments: the PCAF (Partnership for Carbon Accounting Financials) Standard is a widely referenced methodology framework, typically applied with asset-class-specific calculation approaches and PCAF data-quality scoring. This is its own discipline and is treated separately from a typical service-entity Scope 3 inventory.

Source-document evidence for assurance

Below is a practical evidence list — the kinds of records limited-assurance procedures over a Scope 3 inventory commonly draw on. This is common practice observed in BRSR / GHG engagements, not a SEBI-prescribed list, and the specific evidence requested in any given engagement is determined by the assurance partner’s procedures.

Category	Primary evidence	Edge cases the partner will probe
Cat 1 — Purchased goods and services	AP / vendor master extract for the reporting period; cloud provider sustainability reports; SaaS vendor disclosures	Vendor classification methodology; treatment of intra-group purchases; allocation when a vendor serves multiple categories
Cat 6 — Business travel	TMC trip extract; expense system extract for non-TMC trips; hotel booking records	Class-of-travel reconciliation; chartered / private-jet treatment; spouse / non-business travel exclusion
Cat 7 — Employee commuting	Commute survey results; HR location data (office vs WFH split); applied emission factors with sources	Survey response rate; how non-respondents are handled; year-on-year methodology consistency
Cat 11 — Use of sold products (SaaS)	Cloud provider invoices; customer-allocation methodology; per-region carbon intensity disclosures	Allocation defensibility (revenue vs usage vs seat-based); treatment of free-tier customers
Cat 15 — Investments	PCAF score per asset class; underlying portfolio data; emission-factor sources	Coverage rate; data-quality scoring (PCAF Score 1-5); sovereign vs corporate vs project finance treatment

Common practice patterns observed in Scope 3 inventories

These are common practice patterns observed in BRSR engagements — not SEBI-recognised categories of finding. Each is framed as an observation, not a categorical rule.

1. Spend-based Cat 1 dominates the footprint when first measured. The first-year inventory typically shows a large Cat 1 number driven by spend-based factors. Year 2 onwards, the entity often refines to activity-based for the top 5-10 vendors, which materially changes the absolute number — that change is itself a methodology disclosure, not a year-on-year reduction.

2. Cat 6 baselines pre- vs post-pandemic are not comparable without disclosure. Many entities adopt FY 2019-20 as the pre-pandemic baseline and a post-pandemic reset year (commonly FY 2022-23 or FY 2023-24). The choice of baseline year and the rationale should be disclosed alongside the inventory.

3. Cat 7 methodology shifts are common as hybrid policies stabilise. Entities with hybrid policies often re-baseline Cat 7 every 2-3 years as the policy stabilises. The disclosure should make the policy + methodology + year-on-year comparability explicit.

4. Newly-acquired subsidiaries’ Scope 3 scope is an entity-policy edge case. When and how to bring a newly-acquired subsidiary’s Scope 3 into the consolidated inventory is an implementation matter rather than a source-defined audit category. Common conventions: bring in from the acquisition date, full year if acquired in H1 / partial year if acquired in H2, full year always with prior-year restatement disclosure. Whichever convention, applied consistently.

5. Cloud provider disclosures vary materially in granularity. AWS, Azure, and GCP publish per-region carbon intensity (some at hourly granularity); other cloud / SaaS vendors publish only aggregate annual numbers; some publish nothing. The entity’s disclosure should make the data source per major vendor explicit so the assurance partner can probe data quality.

6. Double-counting between Cat 1 and other categories is a routine assurance question. A vendor’s services purchased may include their business travel (already in their Scope 1) and their employee commuting (already in their Cat 7) — when the entity uses spend-based Cat 1, all of those are implicitly included; when activity-based, they may be excluded. Documented methodology consistency matters more than the absolute decision.

7. Limited assurance is the norm at first; reasonable assurance is multi-year journey. Most early Scope 3 inventories carry a limited-assurance opinion with explicit methodology caveats. Moving to reasonable assurance typically requires 2-3 years of methodology stability, primary data for the largest categories, and an internal control framework over the source-data extraction.

Assurance considerations specific to Scope 3

Entities should apply the assurance standard required or accepted in the applicable SEBI / engagement context and disclose the standard applied clearly in the assurance report. Standards commonly referenced in BRSR / GHG assurance practice include:

• ICAI’s SAE 3410 — the localised standard for assurance engagements on greenhouse gas statements, issued by the Sustainability Reporting Standards Board of the ICAI.
• IAASB’s ISAE 3410 — the international standard on the same subject. IAASB has announced ISAE 3410 will be withdrawn in favour of the new ISSA 5000 (International Standard on Sustainability Assurance) — entities planning multi-year assurance programmes should confirm the applicable timeline with their assurance partner.
• The more generic ISAE 3000 / SAE 3000 family — referenced in some engagement contexts for non-financial / sustainability assurance.

The specific permissibility of any given standard for any given engagement is set by the latest applicable SEBI circular and the engagement letter. The above list is illustrative of standards in current practice — it is not a substitute for confirming the applicable standard for the entity’s specific reporting cycle.

In practice, early Scope 3 inventories commonly carry limited-assurance opinions rather than reasonable assurance. Data quality and completeness in Cat 1 (spend-based estimates), Cat 11 (allocation-based estimates for SaaS), and Cat 15 (PCAF-scored investments) are commonly cited as material reporting risk areas that take multiple reporting cycles of methodology stabilisation to bring to reasonable-assurance threshold.

What this guide captures and what it doesn’t

Captures:

• Where Scope 3 sits in BRSR vs BRSR Core
• The 15 GHG Protocol Scope 3 categories and their typical relevance for service-sector business models
• Material categories for IT services / professional services / financial services / SaaS
• Calculation method options and assurance-readiness considerations
• Common practice patterns and audit observations

Doesn’t capture (separate engagements / future pages):

• PCAF Standard for financed emissions calculation (Cat 15) — its own discipline; the financial-services industry guide will go deeper
• BRSR Value Chain Verification scope and procedures — covered separately
• Sector-specific deep-dives (IT services walkthrough, financial services walkthrough) — Phase C industry verticals will publish these
• Reasonable-assurance vs limited-assurance methodology — see the Assurance for BRSR Core cluster

How Scope 3 relates to BRSR Core

BRSR Core is a separate construct on top of underlying GHG accounting. The BRSR Core GHG emission intensity per revenue attribute (Principle 6) reports Scope 1 + Scope 2 emissions divided by PPP-adjusted revenue. Scope 3, when disclosed, is a supplementary disclosure under Principle 6 Leadership — sourced from the same underlying GHG inventory but reported as an absolute figure, often broken out by category.

Audit-trail spans the underlying GHG inventory; metric construction differs:

• BRSR Core (Scope 1+2 intensity) — reasonable assurance; specific PPP-adjusted denominator; in the Core KPI set
• Leadership Scope 3 disclosure — limited assurance typically; absolute or per-revenue figures; outside the Core KPI assurance set; can be requested as extended-scope engagement

See the GHG Emission Intensity per Revenue methodology page for the BRSR Core attribute treatment.

Related reading

• GHG Emission Intensity per Revenue — the BRSR Core Scope 1+2 attribute
• NGRBC Principle 6 — Environment — full Principle 6 essential + leadership disclosures
• CEA Grid Emission Factors — for the Scope 2 calculation underlying the Core attribute
• Materiality Assessment Walkthrough — the framework that informs which Scope 3 categories are reported
• BRSR Core Assurance Service — engagement scope including extended-scope Leadership disclosures
• ISAE 3410 / GHG Verification Service — standalone GHG inventory verification under the IAASB / ICAI standards