It is a Friday in Cork. You run a 15-vehicle HVAC installation company — 12 crew vans and three sales rep cars. One rep's 2022 Octavia is coming off PCP and you have two quotes on the desk. A new 1.5 TDI Octavia Monte Carlo at €35,000, CO2 rated 115 g/km. A 2.0 TDI Audi A4 35 at €35,500, CO2 rated 155 g/km. Both are 4-year PCPs at similar monthly payments. The A4 feels like the nicer car. You are about to sign.

Before you do, pull up the current motor tax rate schedule on motortax.ie and Revenue's BIK guidance. The difference between these two cars over a 4-year lease is roughly €36,000 in total tax cost. That is the entire list price of the Octavia. Most fleet buyers have no idea because the PCP monthly is the only number on the negotiating table.

Two tax regimes, one confused fleet owner

Ireland runs two parallel motor tax regimes, and Irish fleet buyers routinely confuse them:

  • Passenger cars and SUVs (Category M1) — taxed on CO2 emissions. Post-July 2020 vehicles use the WLTP test cycle, rates are in bands A0 through G. A diesel at 115 g/km WLTP sits in band A3 at €210/year. At 155 g/km it sits in band B2 at €420/year.
  • Goods vehicles (Category N1) — taxed on unladen weight, not CO2. Under 3,000 kg unladen it is €333/year flat. A 2026 Euro 6 Transit Custom and a 2010 diesel Transit both pay €333. CO2 is irrelevant for commercial vehicle motor tax.

This single distinction drives more wrong fleet decisions than any other tax rule in Ireland. Fleet owners buying crew vans for installers do not worry about CO2 because motor tax is flat. Fleet owners buying company cars for sales reps should worry enormously.

The worked Cork example — motor tax alone

Your two cars on the desk:

  • Skoda Octavia 1.5 TDI, 115 g/km — Band A3 — €210/year × 4 = €840
  • Audi A4 2.0 TDI, 155 g/km — Band B2 — €420/year × 4 = €1,680

Difference over a 4-year lease: €840. Across three reps on similar spec swaps over the same 4 years: €2,520. Not transformational, but it is €2,500 that the A4 badge is not actually worth to your business.

BIK — the real fleet-planning number

If any of your fleet cars are assigned to employees and available for private use (which almost every sales rep car is), the employee pays Benefit-in-Kind income tax on the deemed value of the benefit. The cost lands on the employee, but the employer is responsible for calculating and reporting it correctly — and most fleet owners end up raising rep salaries to offset high BIK hits. So it is your problem either way.

The Finance Act 2019 overhauled BIK on company cars effective from 2023. The new structure, still in force for 2026:

  • BIK = OMV (Original Market Value, roughly list price) × BIK percentage.
  • BIK percentage is on a grid: CO2 category A (0-59 g/km) through E (180+ g/km), crossed with annual business mileage band (under 26k km, 26-39k km, 39-48k km, 48k+ km).
  • At 2026 rates, a Category B diesel (CO2 141-155 g/km) at low business mileage (<26k km) is 24% BIK. A Category A EV (0-59 g/km) at the same mileage is 15.75% after the €10,000 OMV reduction that applies for EVs.

For our example rep doing roughly 22,000 business km a year (common for a regional sales role):

  • Octavia 1.5 TDI, OMV €35,000, CO2 115 g/km → Category A2 (111-140 g/km) → 22.5% BIK → €7,875 taxable benefit/year
  • Audi A4 2.0 TDI, OMV €35,500, CO2 155 g/km → Category B (141-155 g/km) → 26.25% BIK → €9,318 taxable benefit/year

Difference per rep per year: €1,443 in taxable benefit. At a 40% marginal PAYE + 4% PRSI + 8% USC = 52% combined rate, that is €750 out of the rep's pocket per year for a car that drives essentially identically. Over 4 years, €3,000 per rep. Over three reps, €9,000 across the fleet.

When EV changes the maths entirely

The BIK regime for EVs is where Irish fleet choices currently sit in a pricing sweet spot. Through 2025 and into 2026, the Revenue rules allow a €10,000 reduction on OMV for the BIK calculation on EVs, in addition to the lowest CO2 category rate of 9%.

A BMW iX1 at OMV €58,000 (Category A, 0 g/km) at 22k km/year:

  • Effective OMV for BIK: €58,000 - €10,000 = €48,000
  • BIK rate: 15.75% (Category A mid mileage band)
  • Taxable benefit: €7,560/year

Compare the A4 diesel at €35,500 OMV and 26.25% BIK at €9,318/year. The EV at €58,000 list costs the rep less in BIK than the diesel at €35,500 list. That is the gap the current Irish tax code has opened, and it is the core reason Irish company-car fleets are shifting toward EV faster than the general market.

Watch the sunset: the €10,000 OMV reduction is scheduled to taper. Check Revenue's company car BIK page before you model a 4-year lease — the rules almost always tighten in each Budget.

Vans on BIK — the €750 flat that still matters

A commercial van used by an employee with private use available is not on CO2-based BIK. It is flat: 8% of OMV in 2026, with a minimum €750/year and reductions where private use is restricted or pool-van rules apply. A Transit Custom at €28,000 OMV carries €2,240 BIK/year. An electric Kangoo E-Tech at €37,000 OMV with a €10,000 OMV reduction and reduced rate is roughly €1,080 BIK. Still favourable to EV, but the gap is smaller than on cars because the van baseline is already lower.

The trap: many fleet owners assume their installer's panel van is not BIK because "it is a work van". Revenue's position is that BIK applies unless private use is specifically restricted (prohibited in employment contract, logged journeys, parked at employer premises overnight). If your installers take vans home and use them for the weekly shop, that is private use. Talk to your accountant.

Reading the spec sheet like a fleet accountant

Before signing any car order, check:

  1. WLTP CO2 figure — this is on the manufacturer configurator and the Certificate of Conformity. It determines motor tax band and BIK category.
  2. OMV — Original Market Value as Revenue would assess it. Usually the list price including standard VAT at time of first registration. Dealer discounts do not reduce OMV for BIK.
  3. Expected business mileage — pull the last 12 months' mileage data on the rep the car replaces. BIK mileage bands have big steps at 26k, 39k and 48k annual business km.
  4. Whether private use is available — if yes, BIK applies. If no (fully restricted, documented, enforced), it may not. The documentation burden sits on you.

The 4-year fleet-buying decision tree

  1. Installer or technician with tools — goods-panel van, Category N1, €333/year flat motor tax. Choose on reliability, parts availability, payload. Ignore CO2.
  2. Sales rep doing 20-40k km a year with a suit — EV saloon or estate if charge infrastructure works for the territory. The BIK advantage is real through 2026 and probably 2027.
  3. Short-radius urban rep or admin — small EV (Kona, MG4, Renault Megane E-Tech). Cheapest BIK category, lowest motor tax.
  4. High-mileage regional rep in rural territory — diesel estate is often still the honest answer despite BIK disadvantage, because the 48k+ km mileage band lowers BIK rate substantially. Run the maths on both before assuming EV.
  5. Director's car / executive — BIK-optimise the spec. A €75,000 SUV diesel on list price will be a BIK nightmare for the director.

Sources & further reading

Related Mekavo articles: CVRT scheduling for Irish SMB fleets, Importing a UK van to Ireland after Brexit.

Why we care

Mekavo Fleet tracks every vehicle's OMV, CO2, registration date, annual business mileage and BIK category alongside the CRW and motor tax. So when a rep's lease comes up and the dealer is pushing a higher-CO2 spec, the real 4-year tax cost is in front of you before you sign. We are not a tax advisor. We surface the numbers so your accountant's advice is cheaper and faster.

Note on scenarios: The shops, names, addresses, and case reference numbers in this article are fictional and used solely to illustrate how the cited statutes operate in practice. Any resemblance to actual shops, owners, or events is coincidental. The statutes, regulations, and agency procedures cited are real and current as of publication.