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UK Drivers Face Unexpected Car Tax Bills Due to Loophole

  //travel-leisure.news-articles.net/content/2026/ .. ce-unexpected-car-tax-bills-due-to-loophole.html
  Published in Travel and Leisure on Friday, February 6th 2026 at 0:00 GMT by Birmingham Mail
      Locale: UNITED KINGDOM

London, UK - February 6th, 2026 - Millions of UK drivers, particularly those clocking up high annual mileages, are potentially facing unexpectedly high Vehicle Excise Duty (VED) bills due to a loophole in the current car tax system, according to motoring experts. The issue stems from a shift in how VED is calculated for vehicles first registered after April 1st, 2017, and is increasingly impacting drivers as older vehicles continue to be taxed under the revised regulations.

The traditional method of calculating VED was based on a vehicle's actual CO2 emissions output. However, the introduction of the Worldwide Harmonised Light Vehicle Test Procedure (WLTP) in 2017 - intended to provide more realistic emissions figures - inadvertently created a problem. Many manufacturers were required to resubmit emissions data under the new WLTP standards. Crucially, some vehicles lacked official, updated CO2 data following this process.

To address this data gap, the Driver and Vehicle Licensing Agency (DVLA) implemented a 'notional' emissions assessment system. This system calculates a vehicle's emissions not based on real-world testing, but instead on its weight and an assumed CO2 output. While intended as a temporary fix, the notional system remains in place and is now being widely criticised for its unfairness and potential to significantly inflate tax bills.

Andy Harrison, Director of Fleet Motor Show, warns this system is effectively a "tax trap." "Motorists are being unfairly taxed because the notional emissions system is penalising them. It's not a reflection of their actual environmental impact, but rather a blunt instrument applied due to data deficiencies. We're seeing drivers paying hundreds of pounds more in car tax than they should," he explained.

The problem is particularly acute for owners of older diesel vehicles. Diesels, historically favoured for their fuel efficiency on long journeys, often fall into this data gap, pushing them into higher VED bands. But the impact extends beyond diesel owners. Any vehicle where updated WLTP data is unavailable is susceptible to the notional assessment. This means that even relatively modern petrol or hybrid cars could be unfairly taxed.

Why Long-Distance Drivers Are Hardest Hit

The notional emissions system has a disproportionate impact on those who regularly travel long distances. The logic, while flawed, is that heavier vehicles - which tend to be used for longer journeys - are inherently less efficient. This leads to a higher 'assumed' CO2 output and therefore a higher tax band. However, this doesn't account for well-maintained, fuel-efficient vehicles that genuinely produce low emissions during real-world driving.

"The system fails to differentiate between a genuinely polluting vehicle and one that is simply heavier but driven efficiently," Harrison stated. "Someone driving a well-maintained older car 20,000 miles a year could end up paying more tax than someone driving a newer, less efficient vehicle a shorter distance."

Checking Your Tax Band & Potential Recourse

Drivers are urged to check their vehicle's tax band on the [ GOV.UK website ]. The site allows you to input your registration number and determine your VED liability. If drivers suspect they are being unfairly taxed due to the notional emissions system, they can appeal to the DVLA, providing evidence of their vehicle's actual emissions performance (if available).

Calls for System Reform

The Fleet Motor Show and other motoring advocacy groups are now calling for a complete overhaul of the VED system. They argue that the DVLA needs to prioritise the collection and verification of accurate WLTP data for all vehicles, effectively eliminating the need for the notional emissions assessment. They suggest a phased approach, with a clear timeline for updating all vehicle data and transitioning away from the flawed system.

"The current system is not only unfair but also undermines the government's environmental objectives," Harrison concluded. "It incentivises drivers to replace potentially perfectly good, well-maintained vehicles, simply to avoid a punitive tax bill. A fair and accurate VED system should reward efficiency, not penalise it." The issue is expected to be raised in Parliament in the coming weeks, with pressure mounting on the government to address this growing concern amongst motorists.