In April, employees with workplace health cover should check their tax code reflects the medical insurance benefit correctly. Employers should start P11D preparation now — forms are due to HMRC by 6 July, with Class 1A NIC at 15% payable by 22 July — and plan for the April 2027 switch to mandatory payrolling of benefits.
- ✓Employees: check your new tax code includes the medical insurance BIK — no more, no less.
- ✓Employers: P11Ds due 6 July; Class 1A NIC (15%) payable by 22 July.
- ✓This is the last full P11D cycle before mandatory payrolling arrives in April 2027.
Why April matters for health cover
Workplace health insurance is a taxable benefit in kind, and the tax machinery around it runs on the tax-year clock. April is when new tax codes land, when last year's benefit figures start their journey onto P11Ds, and — for the 2026/27 year now starting — the final full reporting cycle before mandatory payrolling of benefits begins in April 2027. Ten minutes of checking now prevents the classic problems: wrong tax codes, July P11D scrambles and surprise underpayment letters.
The stakes are modest but real on both sides. For an employee, an incorrect code quietly moves money in the wrong direction every payday until someone notices — often not until a P800 calculation arrives long after the year ends. For an employer, late or wrong P11Ds mean penalties, correction rounds and exactly the kind of HMRC correspondence nobody budgets time for. Both are cheap to prevent in April and tedious to fix in November.
If you're an employee: the five-minute check
- Find your new tax code — on your April payslip or in your personal tax account — and check it against HMRC's coding notice.
- Confirm the medical benefit is in there once. Your code is usually reduced by the value of employer-paid cover. Generally, if it's missing you're building up an underpayment; if it appears twice, or at last year's higher value after you've downgraded, you're overpaying now.
- Tell HMRC about changes. Joined, left or changed the scheme, or added family members? Your employer reports annually, but you can update HMRC sooner to keep the code accurate.
- Expect your P11D copy by 6 July and check the medical figure looks right against your scheme tier.
- Sense-check the value — roughly what the cover costs is what you're taxed on; our BIK calculator guide shows the arithmetic.
If you're an employer: the P11D countdown
The 2025/26 reporting cycle is now live, and health cover is one of the most commonly mis-reported benefits. The dates that matter:
| Deadline | What's due |
|---|---|
| 6 July 2026 | P11Ds to HMRC and copies to employees; P11D(b) declaring Class 1A NIC |
| 22 July 2026 | Class 1A NIC paid electronically — 15% of the benefit value |
| Through the year | Keep joiner/leaver and tier-change records clean so next April isn't archaeology |
Start by reconciling your insurer's premium statements against payroll records: every joiner, leaver and mid-year tier change alters someone's benefit figure. The detailed walk-through is in our P11D deadlines guide.
Start the tax year with the right cover
The April jobs beyond the paperwork
- Review the scheme itself. New tax year is a natural point to check headcount, tiers and whether the benefit still matches what staff value — before renewal lands.
- Plan for payrolling. From April 2027, benefits move from P11Ds into monthly payroll. Registering to payroll voluntarily for 2026/27 is a live option — it makes this the practice year rather than the cliff edge. See our payrolling 2027 guide.
- Communicate the tax to staff. A one-paragraph note explaining the BIK — what it costs each band, why codes change — prevents most of the April queries HR receives.
- Check Class 1A budgeting. At 15%, the NIC on a scheme averaging ~£57 per employee per month is real money; make sure July's payment is in the cash-flow forecast.
Frequently asked questions
What should employees check about health insurance at the start of the tax year?
Check your new tax code includes the medical insurance benefit correctly — present once, at a value roughly matching what your cover costs. Generally, a missing benefit builds up an underpayment; a duplicated or outdated one means you're overpaying now. Then check your P11D copy, due by 6 July, against your actual scheme tier.
What are the P11D deadlines for health insurance in the 2026 tax year?
P11Ds for 2025/26 — including employer-paid medical insurance — are due to HMRC by 6 July 2026, with copies to employees by the same date. The Class 1A NIC on the benefit, at 15%, is payable by 22 July 2026. This is the last full P11D cycle before mandatory payrolling begins in April 2027.
How does the April 2027 payrolling change affect health insurance benefits?
From April 2027, benefits in kind including medical insurance must generally be reported through payroll each month rather than on annual P11Ds — employees pay the tax in-year via their payslip instead of through tax-code adjustments. Employers can register to payroll voluntarily for 2026/27, making this a sensible practice year.
Should employers review their health insurance scheme at the new tax year?
It's a natural checkpoint: reconcile insurer statements against payroll before P11D season, confirm headcount and tiers are current, budget for July's Class 1A NIC payment, and decide whether to register early for payrolling. Doing this in April, ahead of renewal, gives you time to renegotiate rather than rubber-stamp.