Taxable Benefits Calculator
Company benefits like a car, private medical cover, or an interest-free loan are not simply “free” — HMRC assigns most of them a taxable cash value, and you pay Income Tax on that value as if it were extra salary. This calculator works out the taxable value of your specific benefits and the genuine extra Income Tax they add to your bill.
Taxable Benefits Calculator
Calculate the tax you owe on company car, medical and other benefits-in-kind for 2026/27.
Why Your Employer Pays the National Insurance, Not You
Benefits in kind are subject to Class 1A National Insurance, currently 15%, but this is paid entirely by your employer, not deducted from your pay — as an employee, you only ever pay the Income Tax on a benefit’s taxable value, never any National Insurance on it. This is genuinely worth knowing clearly, since seeing a benefit’s “taxable value” figure can understandably make the tax impact look larger than it actually is to you personally; the employer NI shown by this calculator is a real cost, but it is not one that comes out of your own pay.
This distinction is worth keeping firmly in mind when comparing this calculator’s different figures — your own genuine cost is the “Extra Income Tax” figure specifically, not the total taxable benefit value or the employer NI shown alongside it, both of which are meaningfully larger numbers that do not represent money coming out of your own pocket.
The CO2 Banding That Decides Your Company Car Tax
A company car’s taxable value is not simply its list price — it is the list price multiplied by a percentage that rises steeply with the car’s CO2 emissions, from as low as 2% for a genuinely zero-emission electric vehicle up to 37% for the highest-emitting petrol and diesel models. This is precisely why an electric or low-emission company car is so commonly recommended as tax-efficient: an identical list price produces a dramatically smaller taxable benefit, and correspondingly smaller extra tax bill, purely from a lower CO2 figure.
This gap is worth genuinely comparing directly against your own realistic car options, rather than assuming the difference is marginal — the CO2 banding spans roughly eighteen-fold between the lowest and highest bands, which on an identical list price can mean a considerably larger, or considerably smaller, annual tax bill depending purely on which specific model is chosen.
Why a Benefit Can Cost More Than a Flat Percentage Suggests
This calculator works out your genuine marginal tax cost — the actual extra tax the benefit adds given your specific salary — rather than assuming a single flat rate applies to the whole benefit value. A £49,800 salary combined with a £9,000 taxable car benefit pushes part of that benefit across the higher-rate threshold: at a naive flat 20% assumption, this would suggest roughly £1,800 in extra tax, but the genuine calculation, correctly splitting the benefit across both the basic and higher bands, comes to roughly £3,506 instead — nearly double the naive estimate, purely because part of the benefit falls into the 40% band rather than the 20% one.
This is genuinely worth checking directly at your own salary level rather than relying on a rough mental estimate — anyone whose salary sits reasonably close to the higher-rate threshold before benefits are added is at real risk of a benefit pushing a meaningful portion of it into the higher band, an effect that only shows up clearly once the actual combined figure is calculated properly.
The Interest-Free Loan Benefit Most People Forget About
An employer-provided loan over £10,000 with no interest, or interest below HMRC’s official rate, is itself treated as a taxable benefit — calculated as the official rate, currently 2.25%, applied to the amount above £10,000. This is a genuinely easy benefit to overlook when estimating your total tax position, since it does not involve an obvious “extra” like a car or medical cover, but it is a real, taxable benefit nonetheless if your employer has provided this kind of loan. Our Salary Sacrifice Calculator is worth checking if you are weighing up a pension contribution against a taxable benefit as part of a wider remuneration package, and our Income Tax Calculator is useful for seeing your full tax position once your salary and benefits are combined.
Frequently Asked Questions
Does a company car with no private use still count as a taxable benefit?
Generally not — the company car benefit specifically applies to private use of the vehicle; a car used genuinely and exclusively for business purposes, with no private use at all, is typically not taxed as a benefit in kind, though this needs to be genuinely the case, not simply an informal arrangement.
Is private medical insurance always a taxable benefit?
Yes, when provided by an employer — the full premium cost is treated as a taxable benefit, which is worth factoring in when comparing an employer-provided policy against arranging equivalent cover privately yourself.
Does salary sacrifice for a company car change how it is taxed?
The car benefit itself is still taxed under the same CO2-based rules regardless of whether it is provided through salary sacrifice, though sacrificing salary for the car can still produce a genuine saving depending on the specific numbers involved, similar to how pension salary sacrifice works.
Do I need to report benefits in kind myself?
Your employer typically reports benefits to HMRC directly, either through payrolling benefits or an annual P11D form, and your tax code is usually adjusted to collect the extra tax through PAYE, so a separate report from you is not usually required unless you are self-employed or have unreported benefits.
Does a benefit ever push me into losing part of my Personal Allowance?
Yes — since a benefit’s taxable value counts toward your total income, a large enough benefit combined with your salary can genuinely push your total income above £100,000, beginning to taper away your Personal Allowance in the same way any other income increase would.
Important Information
This calculator provides an estimate based on standard 2026/27 benefit-in-kind rules for general information purposes only and does not constitute tax advice. Actual taxable values depend on your specific benefit terms. See our Disclaimer for further information.