Salary sacrifice generally doesn't save tax on health insurance any more. Since the April 2017 Optional Remuneration Arrangement (OpRA) rules, the taxable benefit is the higher of the salary given up or the premium — so the income tax and employer's Class 1A NIC advantages disappear. Pensions and cycle-to-work are exempt from OpRA; medical insurance isn't.
- ✓OpRA rules (April 2017) tax health insurance on the higher of salary sacrificed or the premium.
- ✓That removes the income tax and Class 1A advantage — sacrifice rarely beats the company simply paying.
- ✓Pensions, cycle-to-work and ultra-low-emission cars keep their salary sacrifice breaks; medical insurance doesn't.
What salary sacrifice was supposed to do
Salary sacrifice means an employee gives up part of their gross salary in exchange for a non-cash benefit. Before 2017 this could be genuinely efficient for health insurance: the sacrificed salary escaped employee National Insurance, and in some arrangements the benefit's taxable value came out lower than the pay given up. Employers saved their NIC on the sacrificed salary too.
That logic still works beautifully for a handful of benefits — most famously pensions, where sacrificed salary avoids both income tax and NIC entirely. Which is exactly why many employers assume it must work for private medical insurance as well. It generally doesn't, and the reason is a specific set of anti-avoidance rules.
The OpRA rules: taxed on the higher figure
From April 2017, Optional Remuneration Arrangement (OpRA) rules apply whenever an employee gives up salary for a benefit, or is offered cash instead of a benefit. For health insurance, the taxable value of the benefit is generally the higher of the salary sacrificed and the normal benefit-in-kind value (the premium). Employer's Class 1A NIC at 15% is charged on the same higher figure.
| Scenario | Salary given up | Premium | Taxable BIK value |
|---|---|---|---|
| Sacrifice matches premium | £800 | £800 | £800 |
| Employee sacrifices more than cover costs | £1,000 | £800 | £1,000 |
| Group rate cheaper than sacrifice | £900 | £750 | £900 |
Compare that with the company simply paying the £800 premium as a straightforward benefit: the taxable value is £800, and the employee keeps their full salary. Under sacrifice, the employee has lost £800 of pay and is still taxed on an £800 benefit — the income tax position is generally no better, and if they sacrificed more than the premium, it's worse.
One sliver survives: benefits in kind don't attract employee Class 1 NIC, so sacrificing salary can still shave the employee's own NIC (8% or 2% of the sacrificed amount, depending on their band). Against that sits payroll complexity, contractual salary reduction — which can affect mortgage applications, maternity pay and pension contributions — and no employer saving, since Class 1A applies on the higher figure anyway. For most schemes it's not worth the machinery.
When you still see sacrifice-style arrangements
Despite the rules, you'll still meet health insurance and salary sacrifice in the same sentence in a few situations:
- Legacy schemes. Arrangements pre-dating April 2017 had transitional protection, but that generally ended by April 2018 for medical insurance — long expired now. Anything still running on old assumptions needs reviewing.
- Flexible benefits platforms. Employees 'spend' a benefits allowance on PMI. If it's structured as optional remuneration, OpRA applies — the platform's tax engine should be valuing the benefit at the higher figure.
- Voluntary upgrades. An employer pays for employee-only cover; staff fund partner or family upgrades from salary. If the upgrade is paid from net pay to the insurer via payroll, it's not sacrifice at all — and genuine employee contributions generally reduce the taxable benefit.
- Cash-or-cover choices. Offering a cash alternative to joining the scheme also brings OpRA into play: the benefit is taxed at the higher of the cash offered or the premium.
The clean structure for most companies is the boring one: the company pays the premium, reports the benefit, and settles the Class 1A NIC at 15%. The premiums are generally corporation-tax deductible either way, so the employer's side is already efficient without any sacrifice engineering.
Skip the structuring, sort the scheme
Why pensions and cycle-to-work are different
OpRA has a short list of exemptions where salary sacrifice keeps its full tax advantage: employer pension contributions (and pensions advice), cycle-to-work schemes, and ultra-low-emission company cars (CO2 emissions of 75g/km or less — the engine of today's EV sacrifice schemes). Sacrificed salary going into a pension avoids income tax and both employee and employer NIC, which is why sacrifice remains the default there.
Health insurance was deliberately left off that list — the 2017 rules were designed to stop exactly this kind of benefit being wrapped in sacrifice. So a sensible benefits stack often runs both approaches side by side: pension via sacrifice, health insurance as a straightforward employer-paid benefit in kind.
What to do instead
If the goal was making cover cheaper, better levers exist. Group schemes are typically 10–30% cheaper per head than individual policies, and business cover runs £35–£110 per employee per month (average around £57) depending on age profile, level of cover and hospital list. Trimming outpatient limits, adding an excess or choosing a tighter hospital list moves the premium far more than any tax structuring.
If the goal was letting employees choose, a simple voluntary top-up model — employer pays core cover, employees fund upgrades from net pay — achieves it without OpRA complications. And from April 2027, benefit tax moves into real-time payroll for everyone, which makes clean, simple structures even more attractive. Tax rules change and individual circumstances vary, so have your accountant sanity-check any arrangement before it goes live.
One last honesty check: sacrifice doesn't even reduce the admin. The benefit still has to be valued (at the higher OpRA figure), reported and Class 1A'd every year — or payrolled from 2027 — so you carry all the compliance of a normal benefit in kind plus the contract variations, payroll changes and OpRA calculations that sacrifice adds on top.
Frequently asked questions
Does salary sacrifice save tax on health insurance?
Generally no. Under the OpRA rules in force since April 2017, the taxable benefit is the higher of the salary given up or the premium, and employer Class 1A NIC applies to the same figure. The main saving that survives is the employee's own NIC on the sacrificed salary — usually too small to justify the complexity.
What are the OpRA rules for health insurance?
Optional Remuneration Arrangement rules apply when salary is exchanged for a benefit or a cash alternative is offered. For medical insurance, they set the taxable value at the higher of the salary foregone and the normal premium-based benefit value, removing the tax advantage sacrifice used to offer.
Why is health insurance treated differently from pension salary sacrifice?
OpRA exempts a short list of benefits — employer pension contributions, pensions advice, cycle-to-work and ultra-low-emission cars — which keep their full sacrifice advantages. Health insurance was deliberately excluded, so it's taxed on the higher-of calculation while pension sacrifice still avoids income tax and NIC entirely.
Is there any NIC saving left in health insurance salary sacrifice?
A small one, for the employee only: sacrificed salary avoids employee Class 1 NIC (8% below the upper earnings limit, 2% above), because benefits in kind aren't subject to it. The employer saves nothing — Class 1A at 15% is due on the higher of salary given up or premium.
Can employees pay for health insurance upgrades through salary?
Yes, and it's often the cleanest route: the employer funds core cover and employees pay for partner, child or upgrade cover from net pay via payroll. That's not salary sacrifice, OpRA doesn't bite, and required employee contributions generally reduce the taxable benefit value.
Does offering cash instead of health insurance trigger the OpRA rules?
Yes. A cash alternative counts as optional remuneration, so employees who take the cover are taxed on the higher of the cash they could have had or the premium. If you want to avoid inflating the benefit value, avoid attaching an explicit cash opt-out figure to the scheme.
Does salary sacrifice for health insurance affect maternity pay or mortgages?
It can. Sacrifice is a contractual reduction in gross salary, which may reduce salary-linked entitlements such as statutory maternity pay, some pension contributions, and the income figure lenders see on payslips. That's another reason most employers now provide health insurance as a straightforward benefit instead.
Are old pre-2017 health insurance salary sacrifice schemes still protected?
No. Transitional protection for arrangements in place before April 2017 generally ended for medical insurance by April 2018 (earlier if the arrangement was varied or renewed). Any scheme still assuming grandfathered treatment is long out of date and should be reviewed with your accountant.
Is it cheaper for the company to pay for health insurance directly?
Usually yes, all things considered. Employer-paid group cover is typically 10–30% cheaper per head than individual policies, premiums and the 15% Class 1A are generally corporation-tax deductible, and there's no OpRA calculation to run. The employee pays income tax on the benefit either way.