P11D Deadline 2026: What Employers Need to Report by 6 July

The P11D deadline is easy to underestimate because, for many employers, it sits just after the end of the tax year when attention has already moved on to payroll, VAT, accounts, staffing and day-to-day business pressures.

But for employers who provide taxable benefits or reimbursed expenses to directors and employees, the 6 July 2026 deadline matters.

For the 2025/26 tax year, employers must report relevant expenses and benefits to HMRC by 6 July 2026. This is usually done through forms P11D and P11D(b), unless the benefits have already been dealt with correctly through payroll. Even where benefits have been payrolled, a P11D(b) may still be required so that the employer can report and pay any Class 1A National Insurance due.

This is not just an admin exercise. It affects employee tax codes, employer National Insurance, payroll accuracy and the business’s wider compliance position.

For small and medium-sized businesses, the biggest risk is often not a complicated benefit arrangement. It is the ordinary, everyday items that get missed: company cars, private medical cover, staff loans, fuel, subscriptions, accommodation, use of company assets or expenses that have not been properly checked.

What is a P11D?

A P11D is a form used to report certain taxable benefits and expenses provided to an employee or director during the tax year.

These are benefits or payments that are not simply salary, but still have a taxable value. Common examples include:

• company cars
• fuel provided for private use
• private medical insurance
• beneficial loans
• living accommodation
• assets made available for private use
• gym memberships
• subscriptions and memberships
• relocation expenses above exempt limits
• certain reimbursed expenses
• vouchers and credit tokens

A separate P11D is usually required for each relevant employee or director. The information reported to HMRC should also be provided to the employee, because it may affect their personal tax position.

For directors of small companies, this is especially important. Owner-managed businesses often blur the line between business spending and personal benefit, especially where the company pays for items that have some private use. That does not automatically mean the cost is wrong or disallowed, but it does mean the tax treatment needs to be reviewed properly.

What is a P11D(b)?

A P11D(b) is different from a P11D.

The P11D tells HMRC about the benefits and expenses provided to individual employees or directors. The P11D(b) tells HMRC how much Class 1A National Insurance the employer owes on those benefits.

For 2025/26, the Class 1A National Insurance rate on expenses and benefits is 15%. That can make benefits more expensive than employers expect, particularly where several staff members receive private medical insurance, company cars or other recurring benefits.

A P11D(b) may still be needed even if benefits have been payrolled. This is a common misunderstanding. Payrolling a benefit may remove the need to submit a P11D for that particular payrolled benefit, but it does not automatically remove the employer’s Class 1A National Insurance reporting requirement.

When is the P11D deadline in 2026?

The deadline for submitting P11D and P11D(b) forms for the 2025/26 tax year is 6 July 2026.

Employers also need to pay Class 1A National Insurance by the relevant July deadline. Class 1A National Insurance on work benefits must usually be paid by 22 July each year for the previous tax year, or 19 July if paying by post.

That gives businesses a very short window between reporting the benefits and settling the related employer National Insurance.

This is why leaving P11D work until the final few days is risky. By that point, the business may still need to gather mileage records, confirm whether benefits were payrolled, check director loan accounts, reconcile expense claims and identify whether anything was paid personally by an employee.

Do employers still need P11Ds if benefits are payrolled?

Not always, but this needs care.

If an employer has correctly payrolled a benefit, it may not need to submit a P11D for that specific benefit. However, employers may still need to work out Class 1A National Insurance and complete a P11D(b).

There are also cases where a P11D may still be needed, for example where:

• an employee received a benefit that was not payrolled
• an employee was excluded from a payrolled benefit
• a benefit was payrolled incorrectly
• the business did not register or set up the process correctly
• a benefit cannot be dealt with through payroll under the relevant rules

This is one reason why benefits and payroll should not be reviewed in isolation. Payroll, bookkeeping and year-end compliance need to agree with each other.

What are the most common P11D mistakes?

The most common P11D problems usually come from incomplete information rather than deliberate non-compliance.

Here are the areas employers should review carefully.

1. Company cars and fuel

Company cars remain one of the most common P11D areas. Employers need to check the correct vehicle details, CO2 emissions, list price, availability dates and any employee contributions.

Fuel is a separate issue. If the employer provides fuel for private use, this can create an additional taxable benefit. It is not enough to assume that “it is mostly business mileage”. Records matter.

2. Private medical insurance

Private medical insurance is often straightforward, but it is still taxable in many cases. Employers should check who was covered, when cover started or ended, whether family members were included and whether the cost was allocated correctly between employees.

3. Director expenses

Directors of owner-managed companies often have more complex expense patterns than employees. Items such as travel, entertaining, subscriptions, phones, laptops, home office costs and company-funded assets should be reviewed properly.

The key question is not simply “did the company pay for it?” but whether the item created a taxable benefit or should be treated differently for tax purposes.

4. Staff loans

Loans to employees or directors can create a taxable benefit where they are interest-free or low-interest and the relevant conditions are met. Director loan accounts should be reviewed before filing P11Ds, especially in small companies where personal and company cash flow can become mixed.

5. Reimbursed expenses

Some reimbursed business expenses may be exempt, but employers should not assume that all reimbursements are automatically tax-free. The business needs adequate records showing what was paid, why it was paid and whether it was wholly business-related.

6. Missing leavers

If an employee left during the tax year but received benefits while employed, they may still need to be included in the P11D process. Leavers are easy to miss if the benefits review is based only on the current payroll list.

7. Assuming small benefits do not matter

Some items may fall within exemptions, such as trivial benefits, but the conditions must be met. Employers should avoid treating small value as the same thing as tax-free.

Why the 2026 P11D deadline deserves more attention

The P11D process is becoming part of a wider shift in employer reporting.

HMRC has been moving towards more real-time reporting of benefits in kind. Mandatory payrolling of benefits in kind has been pushed back to April 2027, giving employers more time to prepare, but the direction is clear.

For SMEs, that means this is a good time to tighten the process rather than treat P11Ds as a once-a-year scramble.

A better process should answer questions such as:

• Are taxable benefits identified when they are introduced?
• Does payroll know when benefits start and stop?
• Are expense claims reviewed consistently?
• Are directors clear on what the company can and cannot pay for tax-efficiently?
• Are records kept throughout the year rather than rebuilt after the year-end?
• Does the business know which benefits are payrolled and which still require P11D reporting?

Good compliance is not just about avoiding penalties. It also gives directors clearer visibility over the real cost of employing staff and providing benefits.

What should employers do before 6 July 2026?

Employers should start with a structured review.

First, list all employees and directors who received benefits or expense payments during the 2025/26 tax year. Do not rely only on current employees. Include leavers and anyone who received a benefit for part of the year.

Second, review the main categories of benefits: cars, fuel, medical insurance, loans, accommodation, assets, subscriptions, relocation support and reimbursed expenses.

Third, check what has already been payrolled. This is important because payrolled and non-payrolled benefits are reported differently, but both may still feed into the Class 1A National Insurance position.

Fourth, reconcile benefits against payroll and bookkeeping records. The accounts may show payments that payroll has not captured, while payroll may include benefits that need to be checked against invoices or provider records.

Fifth, confirm the Class 1A National Insurance due and make sure payment is planned before the July deadline.

Finally, give employees and directors the information they need. P11D details can affect personal tax codes, so late or incorrect reporting can create confusion for staff as well as compliance problems for the employer.