Start once your scope 1 and 2 data are solid and you can make reasonable estimates of how customers use and dispose of your products. Start sooner if the CSRD applies to you, if large customers request the data or if you set SBTi targets and scope 3 is over 40% of your emissions.
What counts as a downstream emission in Scope 3 reporting?
Downstream emissions are the Scope 3 emissions that occur after a company’s product or service has been sold and handed over to the customer. They cover everything from how a product is transported to the end user, to how it’s used over its lifetime, and ultimately how it’s disposed of.
The GHG Protocol, which is the most widely used framework for emissions accounting, identifies several downstream categories within Scope 3. These include:
- Transportation and distribution (downstream): Emissions from moving products from your facilities to customers, including third-party logistics providers.
- Processing of sold products: Relevant when your products are intermediate goods that require further processing before reaching the end user.
- Use of sold products: Often the largest downstream category, this covers the emissions generated when customers actually use your product, such as the energy consumed by electronics or appliances.
- End-of-life treatment: Emissions from disposing of, recycling, or incinerating your products once customers are done with them.
- Downstream leased assets: Emissions from assets you own but lease to others.
- Franchises: Emissions from franchise operations that fall outside your direct control.
- Investments: Emissions associated with your financial investments, most relevant for banks and asset managers.
Together, these categories paint a picture of the full emissions footprint your company creates beyond its own walls. For many businesses, particularly those selling physical products or energy-intensive goods, downstream emissions can actually dwarf their Scope 1 and 2 totals. Understanding what belongs in this bucket is therefore essential before you start calculating anything — and it also shapes who is required to report in the first place.
Which companies are required to report downstream emissions?
Whether you’re legally required to report downstream emissions depends largely on where you operate and your company’s size. In Europe, the CSRD is the primary regulation driving mandatory Scope 3 reporting, including downstream categories, and it applies to large companies first, with requirements gradually extending to smaller businesses over the coming years.
Under the CSRD, companies must report in line with the European Sustainability Reporting Standards (ESRS), which include detailed requirements for Scope 3 emissions. The phased rollout means that large public-interest entities were first in line, followed by other large companies, and eventually certain listed SMEs.
Outside of mandatory regulation, voluntary frameworks also create strong incentives. CDP disclosure asks companies to report Scope 3 data, including downstream categories, and companies setting science-based targets through SBTi are often required to include Scope 3 if it makes up a significant portion of their total footprint. So even if you’re not legally required to report downstream emissions right now, your customers, investors, or the frameworks you’ve committed to might already be expecting it — which brings us to the question of timing.
What triggers the right moment to start downstream emissions reporting?
The right moment to start reporting downstream emissions is when your Scope 1 and Scope 2 data are solid, your Scope 3 upstream categories are reasonably well understood, and you have enough visibility into your product’s end use to make meaningful estimates. Regulatory deadlines are the most obvious trigger, but several other signals point to the same conclusion.
A few practical triggers worth paying attention to:
- CSRD applicability: If your company falls within the CSRD’s scope, downstream reporting becomes a compliance requirement rather than a choice. Knowing your timeline gives you the lead time to build the right processes.
- Customer and investor pressure: Major customers, particularly large corporations with their own net-zero targets, increasingly request Scope 3 data from suppliers. If your downstream emissions show up in their value chain, they’ll want numbers.
- SBTi commitments: If you’re setting science-based targets and Scope 3 represents more than 40% of your total emissions, SBTi guidance expects you to include it in your target boundary, which means you need the data.
- CDP participation: If you’re disclosing through CDP, especially at higher scoring levels, Scope 3 completeness, including downstream categories, is part of the evaluation.
- Product redesign or innovation cycles: When you’re already rethinking your product, it’s the ideal time to embed downstream thinking, since the data you gather can directly inform design decisions.
What ties all of these together is readiness, both internal and external. You don’t need perfect data to start, but you do need enough organizational maturity to collect estimates, engage with customers, and document your methodology. Once you’ve identified your trigger and decided to move forward, the next practical question is how to actually calculate these emissions.
How do you calculate downstream Scope 3 emissions?
Calculating downstream Scope 3 emissions generally involves estimating the emissions that occur after your product leaves your control, using a combination of activity data, emission factors, and sometimes product life cycle information. The exact method depends on which downstream category you’re calculating and how much data you can realistically access.
The GHG Protocol’s Scope 3 Standard outlines several calculation approaches, and most companies use a combination depending on data availability:
- Spend-based method: Uses financial spend data combined with average emissions factors. It’s a reasonable starting point when you have limited product-specific data, though it’s the least precise approach.
- Average-data method: Uses industry-average emissions data per unit of product or activity. More accurate than spend-based, and useful when you know volumes but not specific customer usage patterns.
- Scenario-based method: Particularly useful for “use of sold products.” You model how customers typically use your product, for example how many hours a device runs per year, and apply relevant emission factors to estimate lifetime emissions.
- Life cycle assessment (LCA) data: LCA specialists can produce detailed product-level emissions data that covers the full downstream footprint. This is the most granular approach and is increasingly expected for product-intensive companies.
Across all these methods, the common thread is that you’re working with estimates rather than direct measurements, which is normal and accepted under major reporting frameworks, provided you document your assumptions clearly. The goal isn’t perfection; it’s a credible, consistent, and improving picture of your downstream footprint over time. That said, building that picture comes with real obstacles that are worth understanding before you begin.
What are the biggest challenges in reporting downstream emissions?
The biggest challenges in reporting downstream emissions are data availability, customer engagement, and the complexity of modeling how products are actually used in the real world. Unlike Scope 1 and 2 emissions, which you can measure directly from your own operations, downstream emissions require you to make informed assumptions about things largely outside your control.
Data is the central problem. You often don’t know exactly how customers use your products, how long they keep them, or how they dispose of them, and getting that information requires either customer surveys, product telemetry, or industry averages — none of which are perfect.
Methodology choices add another layer of complexity. Different calculation approaches produce different results, and without consistent methodology year over year, your data becomes hard to compare or trust. There’s also the question of materiality: not every downstream category will be significant for every company, and figuring out which ones matter most requires an initial screening exercise that itself takes time and resources. Getting that prioritization right early is precisely why most companies don’t try to report all downstream categories at once.
Should a company report all downstream categories at once?
No, a company doesn’t need to report all downstream categories at once. The standard approach is to start with a materiality screening to identify which categories are most significant for your business, then prioritize those first. Reporting everything simultaneously, without the data quality to back it up, can actually undermine the credibility of your disclosure.
The GHG Protocol itself acknowledges that not all Scope 3 categories will be relevant to every company. A software company, for instance, will have very different material downstream categories than a manufacturer of home appliances — the former might focus on downstream leased assets or investments, while the latter would likely prioritize use of sold products and end-of-life treatment.
A phased approach tends to work well in practice. Start with the categories that are likely to represent the largest share of your downstream footprint, build your data collection and calculation processes around those, and expand coverage over time as your capabilities grow. Most reporting frameworks, including those aligned with the CSRD, recognize that Scope 3 reporting matures gradually and expect companies to be transparent about what they’ve covered and what they haven’t yet. If you’re ready to take that first step, here’s how to move forward.
Ready to get your downstream reporting off the ground?
Downstream emissions reporting can feel like a big undertaking, especially when you’re balancing it against everything else on your sustainability agenda. The good news is you don’t have to figure it all out alone, and you don’t have to commit to a lengthy engagement before you know what you actually need.
At Dazzle, we match organizations with pre-screened sustainability freelancers who specialize in exactly this kind of work, whether that’s a Scope 3 reporting and emissions consultant, an LCA specialist, or a CSRD consultant who knows the regulatory landscape inside out. You can get matched with the right expert for your specific challenge and start working together within 48 hours, with full flexibility on whether you need project-based support or something longer term.
If you’re not sure where to start, that’s a perfectly reasonable place to be. Reach out to our team and we’ll help you figure out the right next step.
Building your first Scope 3 baseline?
Scope 3 in 100 Days is a free checklist in 4 phases, from spend data to a baseline you can defend. Reviewed by an independent Scope 3 expert.
