Illustrative example: Northfield Foods buys £500,000 of ingredients with an estimated 1,000 tonnes of supply-chain emissions; a £25,000 investment that cuts those emissions by 100 tonnes delivers a direct reduction at £250 per tonne, while buying 100 external credits at £15 each costs £1,500 but changes nothing in the company’s supply chain. That is the practical difference behind carbon insetting vs offsetting for supply chains.
The figures are illustrative, not a claim about a real business. They assume Northfield can fund a supplier efficiency programme, while the offset purchase supports a separate verified project. Both choices may have a place. Calling them equivalent is where businesses get into trouble.
For UK companies, the decision affects Scope 3 reporting, supplier relationships, customer claims and the credibility of a net zero plan. The right answer depends on your emissions boundary, influence over suppliers, reduction costs and the claim you want to make.
“Isn’t insetting just offsetting with a different name?”
No. Insetting funds emissions reductions or removals within your own value chain, or among suppliers and activities directly connected to the products you buy or sell. Examples include financing lower-emission fertiliser for contracted farms, replacing diesel trucks used for your deliveries, or restoring soil on land supplying your raw materials.
Offsetting supports a project outside your value chain. A business might buy a verified cookstove, woodland or methane-capture credit, then report the purchase separately from its gross emissions. The project may deliver genuine climate benefits, but those benefits do not automatically reduce emissions from your suppliers.
The GHG Protocol Corporate Standard provides the foundation for measuring organisational emissions. It does not turn an external credit into a reduction in your inventory. Keep that distinction clear in your accounts and public statements.
The boundary matters
Carbon insetting vs offsetting for supply chains is mainly a question of where the intervention sits. If a packaging supplier changes its energy source for the packaging sold to you, that is a value-chain reduction. If you buy a credit from a forest project in another country, it is an external contribution or compensation activity, depending on the claim and standard used.
There are grey areas. A retailer may invest in regenerative agriculture across farms that supply only part of its private-label range. That can be a credible insetting programme, but only if the participating farms, volumes, baseline and allocation method are documented.
“Why should we spend more on suppliers when credits are cheaper?”
Because the cheap option may not address the risk you actually carry. Supply-chain emissions can drive product disclosures, customer tenders, energy exposure, commodity risk and future reporting requests. An external credit cannot make a carbon-intensive supplier more resilient or give you better Scope 3 data.
Insetting often costs more at the start. Supplier training, data collection, equipment, contract changes and verification all require management time. Yet the investment can reduce energy bills, protect raw-material supply and improve the evidence behind your product footprint.
Offsetting is usually simpler to buy. It can support climate action while a longer reduction programme gets underway, particularly for residual emissions that are technically difficult to remove. It should not become a substitute for asking why your largest supplier emissions have not fallen.
For a company assessing insetting against offsetting, compare the full business case rather than the credit price alone. Include implementation costs, expected emission reductions, supplier retention, energy savings and the value of better data.
| Question | Insetting | Offsetting |
|---|---|---|
| Where does the action happen? | Within the company’s value chain or connected supplier network | Outside the company’s value chain |
| Does it reduce reported Scope 3 emissions? | Potentially, where the reduction is measured and allocated correctly | No; the credit purchase is reported separately |
| Typical business benefit | Supplier resilience, lower operating costs and improved product data | Funding for verified climate projects and potential treatment of residual emissions |
| Main risk | Weak baselines, double counting or unclear allocation | Low-quality credits or overstated carbon-neutral claims |
| Best use | Priority supply-chain reductions | Residual emissions and wider climate finance |
“How do we know whether an insetting project is real?”
Ask for the same evidence you would expect from a serious carbon project. You need a defined baseline, a clear project boundary, a stated calculation method, evidence that the action would not have happened anyway, and controls against double counting.
Suppose a supplier claims that a new heat pump saves 200 tonnes of carbon dioxide equivalent each year. You should be able to see the previous fuel use, the electricity consumption after installation, the emissions factors used, the operating period and who owns the resulting reduction. A supplier estimate without those inputs is a marketing statement, not an auditable reduction.
Allocation is particularly difficult. If a supplier serves ten customers, it cannot assign the full 200-tonne saving to each one. Agree an allocation method based on production volume, mass, revenue or another defensible driver, and use it consistently.
Businesses also need to distinguish project accounting from corporate inventory accounting. The ISO 14064 standard can help structure quantification and verification, but it does not remove the need to explain boundaries and ownership.
If your suppliers are not responding, a structured request is more effective than repeated informal chasing. This supplier engagement letter for Scope 3 data gives you a practical starting point for requesting activity data, emission factors and reduction evidence.
“Can we use offsets while we build a supplier programme?”
Yes, provided you describe the two activities separately. Carbon insetting vs offsetting for supply chains is not an either-or decision in every year of a net zero programme. A business may invest in supplier reductions and purchase carefully selected credits for emissions it cannot yet eliminate.
The order matters. Measure your Scope 1, Scope 2 and relevant Scope 3 emissions first. Set reduction targets, fund the reductions within your control, then assess residual emissions. The Science Based Targets initiative expects companies to prioritise value-chain reductions rather than relying on offsets to meet near-term targets.
Do not say a product is “zero carbon” simply because the company bought credits. A safer statement might be that the company has measured its emissions, reduced a defined amount through its supplier programme and purchased credits to support a separate climate project. Your legal and communications teams should review any consumer-facing claim.
For help deciding what evidence you need before purchasing, see this guide to what makes a carbon credit high quality.
Talk to us about checking your supply-chain reduction plan before you commit budget to credits or supplier projects.
“Which supply-chain emissions should we tackle first?”
Start with the categories that combine material emissions with practical influence. For a food manufacturer, that may be purchased ingredients, land use and refrigerated transport. For a construction business, it may be cement, steel, purchased equipment and subcontractor activity.
Rank suppliers using four tests: emissions volume, confidence in the data, your commercial influence and the cost of reduction. A strategic supplier with poor data and high emissions may deserve attention before a smaller supplier offering an easy but immaterial saving.
Contracts can create leverage. Add data requirements to tender documents, request annual activity information, include reduction plans in supplier reviews and use longer commitments where they help a supplier finance equipment. Do not demand perfect data from every supplier on day one. Tier your requests by spend and likely emissions.
For companies setting targets, this guide on science-based targets for SMEs explains why a credible target needs more than a percentage reduction chosen for convenience.
“What should we report to customers, auditors and investors?”
Report gross emissions first. Then explain reductions, removals, insetting activity and external credits in separate lines. This makes the audit trail easier to follow and prevents a climate contribution being mistaken for a reduction in your own inventory.
Keep project records with invoices, supplier contracts, activity data, emissions factors, calculation files and verification statements. Record the vintage and standard for every external credit. If credits are retired, retain the retirement evidence and state whose account holds the claim.
UK companies within the relevant size thresholds should also consider how supply-chain information supports broader reporting. The UK Government’s SECR guidance covers mandatory energy and greenhouse gas reporting for qualifying organisations, although SECR does not require every company to report all Scope 3 categories.
That distinction matters. A voluntary Scope 3 estimate can still be commercially useful, but it must not be presented as a statutory figure if the underlying requirements do not apply.
“So which option should our business choose?”
Choose insetting when the emissions sit in a supply chain you can influence and the project improves the product, supplier or data quality. Choose offsetting when you are funding a credible external project for residual emissions or wider climate action, not when you are trying to disguise unchanged operations.
For most businesses, the sensible sequence is measurement, supplier reductions, internal investment, then carefully governed external credits. There will be exceptions. A small firm may have limited leverage over a global commodity market, while a larger buyer may be able to change farming, manufacturing or logistics practices at scale.
Carbon insetting vs offsetting for supply chains should therefore be decided by emissions ownership, influence and evidence, not by whichever option has the lowest advertised price. If you cannot show where the reduction happened and who can claim it, the terminology is doing too much work.
Request a practical carbon audit discussion if you need to map your supply-chain emissions, test an insetting proposal or review a credit purchase before making a public claim.
Frequently asked questions
Is carbon insetting better than offsetting?
Not automatically. Insetting is usually more relevant when your priority is reducing supply-chain emissions, improving supplier resilience or producing better product data. Offsetting can support credible climate projects and address residual emissions. The stronger choice depends on your boundary, influence, evidence and the claim you intend to make.
Does carbon insetting reduce Scope 3 emissions?
It can, but only when the reduction occurs within the reported value chain and is measured against a defensible baseline. You also need to avoid double counting between the supplier and customer. A project described as insetting does not reduce Scope 3 automatically simply because it involves a supplier.
Can a UK business use offsets for net zero?
It may use credits for residual emissions or separate climate contributions, but offsets should not replace substantial emissions reductions. Keep gross emissions, reductions and credit purchases separate in your records and communications. Check the relevant target standard and obtain advice before making claims such as carbon neutral or net zero.
What evidence should suppliers provide for an insetting project?
Request the baseline activity, post-project activity, emissions factors, project boundary, calculation method, start date, allocation method and evidence of ownership. Ask who else is claiming the reduction. For larger projects, independent verification or assurance adds confidence, but it does not compensate for unclear boundaries or missing source data.
Frequently asked questions
Is carbon insetting better than offsetting?
Not automatically. Insetting is usually more relevant when your priority is reducing supply-chain emissions, improving supplier resilience or producing better product data. Offsetting can support credible climate projects and address residual emissions. The stronger choice depends on your boundary, influence, evidence and the claim you intend to make.
Does carbon insetting reduce Scope 3 emissions?
It can, but only when the reduction occurs within the reported value chain and is measured against a defensible baseline. You also need to avoid double counting between the supplier and customer. A project described as insetting does not reduce Scope 3 automatically simply because it involves a supplier.
Can a UK business use offsets for net zero?
It may use credits for residual emissions or separate climate contributions, but offsets should not replace substantial emissions reductions. Keep gross emissions, reductions and credit purchases separate in your records and communications. Check the relevant target standard and obtain advice before making claims such as carbon neutral or net zero.
What evidence should suppliers provide for an insetting project?
Request the baseline activity, post-project activity, emissions factors, project boundary, calculation method, start date, allocation method and evidence of ownership. Ask who else is claiming the reduction. For larger projects, independent verification or assurance adds confidence, but it does not compensate for unclear boundaries or missing source data.
