When businesses begin their carbon accounting journey, Scope 1 and Scope 2 emissions are usually the first to be measured — fuel burnt on-site, electricity purchased from the grid. But for most companies, the largest share of their carbon footprint sits somewhere entirely different: in what they buy. This is the heart of Scope 3, Category 1 — Purchased Goods and Services.

Understanding this category is not just an academic exercise. For manufacturers, retailers, and service firms alike, purchased goods and services typically represent 40–80% of total emissions. Getting a handle on this number is essential to any credible net-zero strategy.

What Are Purchased Goods and Services?

Under the GHG Protocol’s Scope 3 emissions framework, Category 1 covers the upstream emissions associated with producing all goods and services that your company purchases. This includes:

• Raw materials (steel, cotton, plastic, paper)
• Manufactured components and finished goods for resale
• Packaging materials
• Office supplies, equipment, and furniture
• Software, cloud computing services, and IT hardware
• Consulting, legal, accounting, and other professional services
• Facilities management and cleaning services

In simple terms: if your company pays for it, the emissions produced in making or delivering that product or service fall under Category 1.

Why This Category Matters So Much

The reason Purchased Goods and Services dominates most companies’ carbon footprints is straightforward: modern supply chains are deep, global, and energy-intensive. A single electronic device requires rare earth mining, component manufacturing across multiple countries, and transcontinental shipping — before it even arrives at your office. All of those emissions are attributed to the purchasing organisation under Scope 3.

For Indian businesses specifically, this matters because India’s manufacturing sector — textiles, electronics, chemicals, metals — is deeply integrated into global supply chains both as a buyer and a seller. Companies exporting to the EU, UK, or US are increasingly being asked by customers to disclose and reduce their Scope 3 footprint.

How Is It Calculated?

There are three primary methods for calculating Category 1 emissions:

1. Supplier-Specific Method

The most accurate approach. You collect actual emissions data directly from each supplier — either from their own carbon disclosures or from a product-level lifecycle assessment (LCA). This gives a precise number but requires significant supplier engagement and data-sharing infrastructure.

2. Average Data Method

You apply industry-average emission factors to the mass or volume of goods purchased. For example, if you buy 10 tonnes of steel, you multiply by the average kg CO₂e per tonne of steel production. Databases like the UK DEFRA factors, Ecoinvent, or India-specific emission inventories provide these averages.

3. Spend-Based Method

The simplest starting point. You multiply spend (in INR or USD) by an economic input-output emission factor for the relevant industry sector. This is less precise than the other methods but is useful when starting out or when supplier-level data isn’t yet available.

Most companies begin with the spend-based method to establish a baseline, then progressively refine high-impact categories using average data or supplier-specific data. This is part of building a robust emissions inventory.

Key Challenges — and How to Address Them

Category 1 is often called the hardest Scope 3 category to measure accurately, and for good reason:

• Data gaps: Many suppliers — especially small and medium enterprises in India — have not yet measured or disclosed their own emissions. Use average emission factors as a bridge until supplier data becomes available.
• Category breadth: A company can purchase thousands of different goods and services. Prioritise categories by spend and estimated emission intensity, not by alphabetical order.
• Double-counting risk: Avoid counting the same emission in both Category 1 and another Scope 3 category. For example, capital goods (equipment bought for internal use over several years) should go in Category 2, not Category 1.
• Dynamic supply chains: Suppliers change. A recalculation may be needed when switching to a new supplier or sourcing region.

Where to Start: A Practical Approach for Indian Businesses

If this category feels overwhelming, here is a step-by-step starting point:

1. Pull your procurement data. Export a full list of purchases from your accounts payable or ERP system for the measurement year.
2. Categorise by spend. Group purchases by type: raw materials, packaging, IT, services, etc.
3. Identify your top 10–15 spend categories. These will likely represent 80% of your Category 1 footprint (Pareto principle applies here).
4. Apply emission factors. Use spend-based factors initially. Refine high-impact categories with average data or direct supplier data as capacity grows.
5. Document your methodology. Record which method you used for each category, the data source, and any assumptions. This is essential for audit-readiness.

The Business Case for Getting This Right

Beyond regulatory compliance and reporting, there is a genuine business case for understanding your Category 1 footprint. Knowing which purchased goods carry the highest emissions often reveals:

• Where your supply chain is most exposed to carbon pricing risks (e.g. CBAM for EU exports)
• Which supplier relationships are worth investing in for emissions improvement
• Where switching to lower-carbon materials or services can reduce both emissions and costs
• How to make credible claims in your BRSR, ESG report, or customer sustainability disclosures

Purchased Goods and Services is where the real lever is. Getting this category right transforms carbon accounting from a compliance box-ticking exercise into a genuine strategic tool. The key is to start — even with imperfect data — and improve methodically over time. India’s net-zero ambitions, both at a national level and within individual businesses, depend on exactly this kind of supply chain transparency.