UK Sustainability Reporting Rules Impact Fleet Emissions

How 2027 sustainability rules may reshape corporate fleet decisions

The UK is preparing to introduce mandatory sustainability reporting standards from January 2027. For many businesses, this will mean closer scrutiny of fleet emissions and transport-related carbon footprints. Consequently, companies are starting to rethink how they source vehicles for short-term needs.

Europcar has argued that rental electric vehicles could offer a practical route to lower reported emissions without the capital outlay of replacing owned fleets. The company’s position highlights a wider shift in how transport choices are evaluated. Previously, fleet decisions turned mainly on cost and availability. Now, they increasingly hinge on how those choices appear in audited sustainability disclosures.

This matters because the new UK Sustainability Reporting Standards (UK SRS) are expected to tighten expectations around how firms account for emissions across their operations and supply chains. Mobility is often a material source of scope emissions, particularly in sectors with frequent employee travel or client transport needs. As a result, vehicle sourcing is moving from the domain of facilities management into the boardroom.

UK SRS builds on existing climate disclosure rules

The UK already requires certain companies to disclose energy use and greenhouse gas emissions under the Streamlined Energy and Carbon Reporting (SECR) framework. This has applied to large quoted companies, large unquoted companies, and limited liability partnerships since April 2019. Additionally, climate-related financial disclosure rules introduced in 2022 require large and listed firms to report material climate risks and opportunities in their strategic reports.

However, UK SRS represents a step change in scope and rigour. The standards are being developed to align more closely with global sustainability reporting frameworks. The Financial Conduct Authority completed its consultation process on the regime in 2024, and a policy statement is expected before the rules take effect. Meanwhile, qualifying companies are already beginning to prepare for compliance.

The new regime is designed to create standardised, comparable, and auditable sustainability disclosures. For businesses, this means emissions from transport and fleet use will become more visible to investors, regulators, and procurement teams. Therefore, decisions about how vehicles are sourced will carry greater reputational and compliance weight.

Rental EVs as a lower-capital route to emissions reduction

Europcar’s proposition is straightforward. Instead of committing to long-term lease agreements or purchasing electric vehicles outright, businesses can reduce fleet-related emissions by renting EVs for short-term or variable needs. This approach offers flexibility and avoids the upfront costs associated with transitioning an entire owned fleet to electric.

For companies that need vehicles intermittently, such as for client meetings, site visits, or temporary project work, rental EVs can deliver measurable emissions reductions without locking in capital. Moreover, rental arrangements allow businesses to scale vehicle use up or down based on demand, which is difficult with owned or leased fleets.

This model may appeal particularly to firms that are preparing for UK SRS compliance but have not yet finalised their broader decarbonisation strategies. It provides a way to demonstrate progress on transport emissions while preserving the option to adjust fleet composition as electric vehicle technology, charging infrastructure, and cost structures evolve.

Nevertheless, rental alone is unlikely to replace long-term fleet planning. Businesses with high and consistent vehicle demand will still need to consider ownership or leasing. However, for variable or unpredictable transport needs, rental EVs offer a middle path between inaction and large-scale fleet replacement.

Fleet emissions are becoming a reporting issue, not just an operational one

The shift from voluntary sustainability claims to mandatory, auditable disclosure changes the context in which fleet decisions are made. Under SECR, companies already report scope 1 and scope 2 emissions, which include direct fuel use and purchased electricity. Many also disclose scope 3 emissions, which cover value chain activities including employee travel and contracted transport.

UK SRS is expected to raise the bar for scope 3 reporting. Specifically, businesses may face greater pressure to quantify and reduce emissions from vehicles used for business purposes, even where those vehicles are not owned by the company. This includes hire cars, rental vehicles, and grey fleet mileage from employee-owned cars used for work.

For fleet managers and finance teams, this means vehicle sourcing choices will increasingly be judged on their emissions impact as well as their cost. Firms that rely heavily on diesel or petrol hire cars may find their reported emissions rise, potentially affecting investor perception, tender eligibility, and supply chain assessments.

As a result, businesses are starting to ask suppliers about the availability of electric vehicles in their rental fleets. Some are also building emissions performance into procurement criteria for vehicle hire. This trend is likely to accelerate as UK SRS comes into force and reporting expectations become clearer.

Sectors with high mobility needs face earlier pressure

Industries with frequent travel requirements, such as professional services, construction, and facilities management, are likely to feel the impact of tighter fleet emissions scrutiny sooner than others. In these sectors, transport emissions can represent a significant share of the overall carbon footprint, making them a natural focus for disclosure and reduction efforts.

For example, consultancy firms that send teams to client sites regularly may find that business travel emissions feature prominently in their sustainability reports. Similarly, construction companies managing multiple projects across dispersed locations may face questions about how they minimise emissions from site visits and equipment transport.

In both cases, rental EVs offer a potential solution that avoids the complexity of managing an owned electric fleet. Companies can specify electric vehicles when booking, track emissions through rental agreements, and adjust their approach as availability and infrastructure improve. Furthermore, rental providers can offer centralised reporting on vehicle emissions, simplifying data collection for sustainability disclosures.

Procurement teams in the public sector are also paying closer attention to transport emissions. The government’s Procurement Policy Note 06/21 (PPN 06/21) requires suppliers bidding for central government contracts above £5 million per year to publish a carbon reduction plan. Vehicle emissions often form part of that plan, which means businesses seeking public sector work may need to demonstrate progress on fleet decarbonisation ahead of broader regulatory deadlines.

Key facts: UK sustainability reporting and fleet emissions

• UK Sustainability Reporting Standards are expected to take effect from 1 January 2027, following FCA consultation and a policy statement.
• SECR has required large companies and LLPs to disclose energy use and emissions since April 2019, covering scope 1 and scope 2 emissions.
• Climate-related financial disclosure rules introduced in 2022 apply to large and listed companies where climate risks are material.
• UK SRS is designed to align with global sustainability reporting standards, increasing comparability and assurance expectations.
• Fleet emissions, including those from rental vehicles and business travel, are expected to receive greater scrutiny under the new regime.
• Rental electric vehicles offer a flexible, lower-capital alternative to fleet ownership or long-term leasing for businesses with variable transport needs.

What businesses should consider as UK SRS approaches

Firms preparing for UK SRS compliance should start by understanding which emissions categories will appear in their disclosures. Transport and fleet use often sit within scope 3, but the boundaries can vary depending on the nature of the business and how vehicles are sourced. Companies should review current vehicle usage, identify emissions hotspots, and assess whether rental EVs could reduce exposure in high-impact categories.

Finance teams should also consider how vehicle sourcing decisions affect capital allocation. Buying or leasing electric vehicles requires upfront investment and ongoing maintenance costs. Rental arrangements, by contrast, offer predictable per-use pricing and transfer responsibility for vehicle maintenance, charging infrastructure, and residual value risk to the supplier.

However, rental is not a universal solution. Businesses with consistent, high-volume vehicle needs may find that ownership or leasing delivers better long-term economics. The key is to match sourcing strategy to actual demand patterns and emissions reduction targets. Therefore, firms should model different scenarios and consider how each option affects both cost and reported emissions.

Another factor is supplier capability. Not all rental providers offer electric vehicles across their fleets, and availability can vary by region. Businesses should engage with suppliers early to understand what electric vehicle options are available, how emissions data will be provided, and whether rental agreements can be structured to support sustainability reporting requirements.

Training and awareness also matter. Fleet managers and employees need to understand why electric vehicle rental is being prioritised and how to use EVs effectively. This includes practical considerations such as charging logistics, range planning, and cost allocation. Without clear communication, rental EV initiatives risk low uptake and limited emissions impact.

Links to UK government guidance and regulatory bodies

For detailed information on UK climate disclosure requirements, businesses can refer to the government’s environmental reporting guidelines, which cover mandatory greenhouse gas emissions reporting. The Financial Conduct Authority provides updates on sustainability reporting standards through its policy statements on climate-related disclosures.

The Department for Energy Security and Net Zero publishes resources on green finance and sustainability reporting, including the government’s approach to aligning UK standards with international frameworks. Additionally, businesses seeking public sector contracts should review PPN 06/21 on carbon reduction plans, which sets out carbon reporting expectations for suppliers.

For sector-specific guidance on transport emissions, the guidance on measuring and reporting environmental impacts provides practical advice on quantifying emissions from business travel and fleet operations.