Reviewed by: MyTaxRebate Team on 10 Mar 2026 | Authority: s.121 TCA 1997 | TDM Part 05-01-01b
Quick Answer
If your employer gives you a company car for private use, the value of that benefit is treated as taxable pay under section 121 TCA 1997. The amount taxed is normally based on the car’s original market value and your annual business mileage, with separate reliefs for certain electric vehicles and specific employer-provided benefits that are exempt or reduced.
What This Page Covers
- ✓How company car Benefit-in-Kind is calculated in Ireland in 2025
- ✓What original market value and business mileage mean in practice
- ✓How electric vehicle relief changes the taxable amount
- ✓Which common employer benefits are exempt or reduced
- ✓When a tax review is worth doing if your payroll BIK looks too high
Key Facts at a Glance
- ✓Company car BIK is generally charged under section 121 TCA 1997 and is taxed through payroll like pay.
- ✓The taxable value is usually based on original market value and the employee’s annual business kilometres.
- ✓Accurate mileage records matter because the BIK percentage can change depending on business use.
- ✓Electric vehicle support can materially reduce the taxable value, but the relief is not the same as a full exemption for every car.
- ✓Some employer-provided benefits are exempt from BIK entirely, while others remain fully taxable.
- ✓Backdate up to four years. In 2025, overpaid tax linked to payroll issues can still be reviewed for 2022, 2023, 2024, and 2025.
What Benefit-in-Kind means for a company car
Benefit-in-Kind is the tax treatment for a non-cash benefit provided by an employer. In a company-car case, the employee is not taxed because they bought the car themselves. They are taxed because private use of an employer-provided vehicle is treated as part of their remuneration package. Section 121 TCA 1997 is the main legislative starting point for that charge.
In plain English, the car benefit is added to taxable pay even though no extra cash changes hands. That means the BIK can affect income tax, USC, and PRSI through payroll. For many employees, the first sign of the problem is simply lower take-home pay than expected rather than a separate invoice or charge.
This is also why company-car cases are often misunderstood. A worker may think the cost of the car to the employer is the figure that matters. In practice, Revenue focuses on the original market value of the car and the employee’s business mileage pattern. Once those figures are wrong, the payroll position can drift quickly.
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Which benefits are exempt and which are still taxable
Company-car BIK is only one part of the wider employer-benefit picture. Some benefits are exempt under specific rules, while others remain taxable in full. Common areas people ask about include health screening, canteen meals, bicycles under the Cycle to Work arrangements, and certain small non-cash benefits. The problem is that people often assume that because one employer benefit is exempt, another one must be as well.
A correct review separates each benefit by category. The company car has its own rules. Employer-paid health insurance has a different treatment. A bicycle supplied under the relevant scheme has another. The safest content therefore explains the benefit in front of the reader, rather than collapsing every employer benefit into one generic “taxable or not” answer.
That distinction also matters for payroll corrections. A worker may not be overpaying because of the car alone. The issue may be a combination of company-car BIK, another taxable benefit, and a separate missed tax credit elsewhere in the file. Looking at the whole payroll picture often gives a better answer than trying to isolate the car in a vacuum.
When a review is worth doing
A BIK review is especially worth doing where the mileage pattern changed during the year, the vehicle changed, the worker had the car for only part of the year, or the EV relief applied but payroll does not appear to reflect it correctly. These are all situations where the worker may simply accept the payslip deduction without checking whether the underlying assumptions are right.
MyTaxRebate approaches these cases as part of a broader PAYE review. We check whether the BIK was likely calculated on the right facts, whether any other payroll issues also exist, and whether a wider four-year review reveals missed reliefs elsewhere. That is usually more useful than looking only at one monthly deduction in isolation.
- Review the figure if payroll is using business mileage bands that no longer match your actual work pattern.
- Review the figure if an EV relief should apply but the taxable amount still looks too high.
- Review the full tax file if the BIK issue appears alongside emergency tax, missing credits, or other payroll anomalies.
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MyTaxRebate can review your position and guide the next step.
Tax Scenarios
Employee with low verified business mileage
A worker is provided with a company car with an original market value of €40,000 and has only 20,000 verified business kilometres for the year. If the applicable BIK percentage is 30%, the taxable benefit is €12,000. A worker on higher combined payroll rates could see a tax cost running into several thousand euro for the year.
Electric vehicle with relief reducing the taxable base
An employee is given an electric company car with an original market value of €50,000. If the available EV relief reduces the figure used for the BIK computation by €35,000, the effective taxable base falls to €15,000 before the relevant percentage is applied. That can make a major difference to the annual payroll charge.
Part-year car availability causing an overstated payroll charge
A worker had a company car available for only half the year, but payroll effectively treated the benefit as if it applied for all 12 months. If the annual taxable benefit should have been €9,000 but only €4,500 applied to the actual period of availability, the worker may have been taxed on an extra €4,500 of benefit that should not have been included.
Common Mistakes To Avoid
- ✗Assuming the current second-hand value matters more than the original market value used for BIK purposes.
- ✗Using commuting mileage as if it were business mileage when trying to justify a lower percentage.
- ✗Treating every electric vehicle as fully exempt rather than checking the actual relief and year-specific rules.
- ✗Looking only at the car and ignoring other payroll problems that may be causing the overall overpayment.
When This Does Not Apply
Key Takeaways
- ➤ Check the original market value and mileage evidence before accepting the payroll BIK figure.
- ➤ Separate company-car rules from the rules for other employer benefits.
- ➤ Review EV cases carefully because the relief changes the taxable computation, not just the marketing message.
- ➤ Use a full PAYE review where the company-car issue may be sitting beside other payroll problems.
Check Your Claim
MyTaxRebate can review your position and guide the next step.
Frequently Asked Questions
How is company car BIK worked out in Ireland?
The taxable value is generally based on the original market value of the car and the relevant percentage linked to business mileage. The benefit is then treated through payroll as taxable pay. The practical result is that the car can affect income tax, USC, and PRSI rather than appearing as a separate standalone bill.
Does commuting count as business mileage for BIK?
Ordinary travel between home and your normal workplace does not usually count as business mileage for company-car BIK purposes. Genuine business journeys are different. That distinction matters because the mileage figure can influence the percentage used in the BIK calculation, which is why poor records often lead to a higher payroll charge.
Are electric company cars fully exempt from BIK?
Not automatically. Electric vehicles can benefit from relief that reduces the taxable amount used in the BIK calculation, but the outcome still depends on the current year’s rules and the facts of the vehicle provided. A worker should not assume that any tax on an EV is wrong without checking the applicable relief first.
Can I get tax back if my company car BIK was wrong?
Possibly. If payroll used the wrong original market value, the wrong mileage assumptions, or treated the vehicle as available for longer than it actually was, the worker may have paid too much tax. The safer route is a full review of the payroll treatment and the wider PAYE file rather than relying on one monthly deduction alone.
How does MyTaxRebate help with a BIK issue?
MyTaxRebate reviews the company-car facts, the payroll treatment, and the wider tax position. We check whether the BIK itself appears right, whether related benefits have been treated correctly, and whether other open-year PAYE issues also exist. That gives the worker a more complete answer than looking only at the car in isolation.
