What is internal carbon pricing and should your business use it?
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For UK businesses working towards net zero, internal carbon pricing can help make carbon reduction a more measurable part of business planning. However, the approach needs reliable emissions data, clear objectives and a price that is meaningful for the organisation.
Understanding how it works can help businesses decide whether it is worth introducing.
Internal carbon pricing is a voluntary approach where a business places a monetary value on its greenhouse gas emissions.
The price is usually expressed as an amount per tonne of CO2e. This allows organisations to consider the potential carbon implications of different activities, investments and purchasing decisions.
For example, a business comparing two pieces of equipment might find that one costs more to purchase but produces fewer emissions during operation.
Applying an internal carbon price can help the organisation assess whether the lower-emission option offers greater long-term value.
The price does not necessarily represent money paid to an external organisation. In many cases, it is an internal financial assumption used to guide decisions.
Internal carbon pricing works by assigning a monetary value to emissions associated with a particular activity or decision.
The business then uses that value to understand the financial implications of its carbon impact.
A simple calculation is:
Internal carbon cost = greenhouse gas emissions (tonnes CO2e) × internal carbon price (£ per tonne CO2e)
For example, suppose a business sets an internal carbon price of £75 per tonne of CO2e.
If an activity generates 100 tonnes of CO2e, its calculated internal carbon cost would be:
100 tonnes CO2e × £75 = £7,500
This £7,500 is not automatically a tax, invoice or external payment. Its treatment depends on the pricing approach the business adopts.
The £75 price is illustrative rather than a recommended rate.
There are three common approaches to carbon pricing for business.
Each serves a different purpose, so organisations should understand how they work before selecting a method.
Shadow pricing assigns a hypothetical financial cost to emissions without requiring an actual internal payment.
Businesses use the figure when comparing investment options, assessing operational changes or planning future expenditure.
For example, an organisation considering two heating systems could estimate their emissions over an agreed period and apply a shadow carbon price to each option.
This helps decision-makers consider emissions alongside purchase costs, energy expenditure and maintenance requirements.
Shadow pricing can be a practical starting point because it can be introduced into existing financial assessments without establishing a separate carbon fund.
However, it will have limited influence if decision-makers do not use the results.
An internal carbon fee involves applying a charge to emissions generated by business departments, sites or activities.
The organisation may collect these internal charges and allocate the resulting budget towards carbon reduction measures.
For example, a business could charge individual departments according to their reported emissions and use the funds to support energy efficiency improvements.
This creates a more direct financial incentive to reduce emissions.
However, internal carbon fees require reliable data, clear responsibilities and agreement on how funds will be managed.
They may therefore be more complex to introduce than shadow pricing.
An implicit carbon price is derived from the cost of measures a business already takes to reduce emissions.
For example, an organisation might spend £40,000 on an improvement expected to reduce emissions by 500 tonnes of CO2e over an agreed period.
Dividing the investment cost by the expected emissions reduction gives an indicative cost of £80 per tonne of CO2e.
This can help businesses understand what they are already spending to achieve carbon savings.
However, the calculation needs to consider the relevant project costs, financial savings, emissions reductions and assessment period.
An implicit carbon price is not necessarily a suitable price to apply across every business decision.
Internal carbon pricing can help businesses connect sustainability objectives with financial planning.
Its value depends on how consistently the organisation applies the approach and whether it influences actual decisions.
Traditional investment assessments focus on factors such as purchase price, operating costs, maintenance and expected financial returns.
Internal carbon pricing adds another consideration by placing a financial value on emissions.
This can help businesses compare options with different carbon impacts and identify investments that support longer-term reduction objectives.
It does not replace a full financial assessment, but it can provide useful additional information.
Businesses often have several potential carbon reduction projects competing for the same budget.
An internal carbon price can help show how emissions affect the relative attractiveness of different options.
For example, it may strengthen the case for a more energy-efficient system where the expected emissions savings are significant.
However, the price should be considered alongside implementation costs, operational requirements and achievable carbon savings.
Internal carbon pricing can make emissions more visible to teams responsible for budgets and operational decisions.
Where appropriate, departments can use carbon costs to understand how their activities contribute to the organisation's environmental objectives.
This can encourage closer cooperation between finance, procurement, operations and sustainability teams.
For the approach to work, employees need to understand how the price is calculated and what decisions it is intended to influence.
Changes in regulation, energy markets and customer expectations can affect business investment decisions.
Internal carbon pricing provides one way to explore how a greater financial emphasis on emissions could influence future choices.
It can support scenario planning, although an internal price should not be treated as a prediction of future carbon taxes or market prices.
Businesses should review their assumptions as circumstances change.
There is no single internal carbon price that is suitable for every business.
The appropriate figure depends on the organisation's objectives, emissions profile, investment decisions and wider financial circumstances.
Start by deciding what the price is intended to achieve.
A business using shadow pricing to compare long-term investments may need a different approach from an organisation introducing an internal fee to fund carbon reduction projects.
The chosen price should be meaningful enough to influence the decisions it is designed to support.
Reviewing the cost of previous and proposed carbon reduction measures can provide useful information.
For example, businesses can compare the cost of different projects against the emissions they are expected to avoid.
This helps establish the level of investment required to achieve particular reductions.
However, project costs should not be treated as the only basis for selecting a carbon price.
Businesses can consider relevant carbon market information, government appraisal guidance and regulatory developments when setting assumptions.
However, market allowance prices, government carbon values and voluntary internal prices serve different purposes.
They should not be treated as interchangeable figures.
Organisations should document which information they have used and why it is appropriate for their decisions.
An internal carbon price needs to be practical within the organisation's financial planning processes.
A price that has little effect on decisions may not achieve its purpose.
Equally, an excessively high price applied without considering operational and financial circumstances could lead to unrealistic comparisons.
Testing different price levels can help businesses understand their potential impact before adopting one.
Consider a business choosing between two pieces of equipment.
Both options provide the same operational function, but they have different purchase costs and expected emissions over their working lives.
| Factor | Equipment A | Equipment B |
| Purchase Cost | £50,000 | £60,000 |
| Estimated lifetime emissions | 200 tonnes CO2e | 80 tonnes CO2e |
| Internal carbon price | £100 per tonne | £100 per tonne |
| Illustrative carbon cost | £20,000 | £8,000 |
| Purchase cost plus illustrative carbon cost | £70,000 | £68,000 |
Without considering carbon, Equipment A appears cheaper by £10,000.
When the illustrative internal carbon cost is included, Equipment B has the lower combined figure.
This example demonstrates how shadow pricing can change an investment comparison.
It does not represent a complete business case. A proper assessment would also consider energy costs, maintenance, equipment lifespan, financing and any other relevant costs or benefits.
The internal carbon cost is a decision-making value, not necessarily an additional cash expense.
Businesses do not need to introduce a complex internal charging system immediately.
A phased approach can help establish whether internal carbon pricing will improve decision-making.
Start with reliable information about the organisation's greenhouse gas emissions.
This may include Scope 1 and Scope 2 emissions and relevant Scope 3 activities, depending on the decisions being assessed.
Businesses need to understand which activities generate emissions before applying a financial value to them.
A consistent emissions baseline also provides a useful reference point for future calculations.
Decide whether internal carbon pricing will support investment appraisals, procurement decisions, operational improvements or a wider carbon reduction programme.
Clear objectives make it easier to choose an appropriate pricing method.
They also help businesses assess whether the approach is producing useful results.
Consider whether shadow pricing, an internal carbon fee or an implicit carbon price best matches the organisation's objectives.
For businesses introducing carbon pricing for the first time, testing a shadow price on selected investment decisions may provide a manageable starting point.
An internal fee may be appropriate where the business has the systems and resources to manage departmental charges.
Choose an initial price based on the intended purpose and relevant financial and environmental information.
Apply it to a small number of realistic business decisions.
For example, a business could test how different prices affect the assessment of proposed energy efficiency investments.
This helps identify whether the price is useful, too low to influence decisions or difficult to apply consistently.
Once the approach has been tested, establish where the carbon price should be used.
This might include capital investment proposals, procurement assessments or business planning.
Finance and operational teams should understand the calculation method and how to interpret the results.
Without clear processes, internal carbon pricing risks becoming a separate reporting exercise rather than influencing business decisions.
Businesses should review their internal carbon price and the decisions it informs.
Changes in emissions data, investment costs, regulations and business priorities may affect whether the original assumptions remain appropriate.
Organisations should also assess whether the approach has influenced investment choices or supported measurable carbon reductions.
Internal carbon pricing can be useful, but it is not necessary for every organisation.
It may be particularly relevant for businesses that:
For smaller businesses with limited resources, measuring emissions and identifying practical efficiency improvements may be a more immediate priority.
Introducing a carbon price without reliable data or a clear purpose can add complexity without improving decisions.
The important question is whether the approach will help the organisation make better-informed choices.
Although internal carbon pricing can support carbon reduction planning, it has limitations.
An internal price does not automatically reduce emissions. Businesses must act on the information it provides.
The results also depend on the accuracy of emissions estimates and the assumptions used to assess future activities.
A shadow price may have little effect if decision-makers continue to prioritise short-term purchase costs.
An internal fee can also create administrative requirements, particularly where emissions need to be allocated across several departments.
Businesses should therefore treat internal carbon pricing as one tool within a wider sustainability strategy, rather than a replacement for carbon measurement, reduction planning or operational improvements.
Internal carbon pricing is most useful when businesses understand their emissions and have a clear process for assessing reduction opportunities.
Green Economy's guide to ranking carbon reduction projects by cost and carbon savings explains how businesses can compare potential projects using financial and environmental considerations.
Organisations assessing the wider investment required can also explore how much net zero costs a business.
Its guidance on setting sustainability KPIs for your business can help organisations establish measurable objectives, while its advice on when to recalculate a carbon emissions baseline explains how to maintain meaningful emissions comparisons.
Green Economy also provides carbon footprinting and sustainability consultancy support to help businesses understand their environmental impact and identify practical carbon reduction opportunities.
Contact Green Economy to discuss how its sustainability services could support your business's carbon reduction planning.
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If you're interested in exploring how we can help your business grow, get in touch and one of our expert advisors will be happy to help.
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