HMRC Mandatory Payrolling of Benefits in Kind: What UK Employers Need to Know for 2027

For decades, the end of the tax year has been synonymous with one thing for UK small business owners and their accountants: the P11D scramble. Gathering data on company cars, private medical insurance, and gym memberships to report to HMRC by July has become an annual ritual of administrative stress.

However, that ritual is about to change forever. HMRC has announced a major shift in how Benefits in Kind (BiK) are reported and taxed. Starting in April 2027, the traditional P11D form will be largely phased out in favour of mandatory, real-time reporting through your payroll.

At Accountant Search, we know that staying ahead of tax changes is vital for SME growth. This guide breaks down what the new 2027 BiK mandate means for you, which benefits are affected first, and how you can prepare your business for a smoother transition.

What is Payrolling Benefits in Kind?

Currently, most employers report taxable benefits provided to employees once a year using a P11D form. HMRC then adjusts the employee’s tax code for the following year to recoup the tax owed. This often leads to "catch-up" tax payments and confusing tax code changes for employees.

Payrolling benefits moves this process into real-time. Instead of waiting until the end of the year, the taxable value of a benefit is added to the employee's gross pay each pay period (usually monthly). Income tax is then deducted right then and there via PAYE.

While this has been an optional service for some years, HMRC is making it mandatory from 6 April 2027.

The Phased Approach: What Happens and When?

HMRC has opted for a phased rollout to give small businesses and software providers enough time to adjust. This isn’t a "one-and-done" switch, but rather a gradual migration of different benefit types.

Phase 1: Starting 6 April 2027

From this date, the most common benefits must be reported through your payroll software. This includes:

• Company Cars and Vans: Including the associated fuel.

• Medical Benefits: Private medical insurance and health screenings.

For these specific perks, you will no longer need to file a P11D. Instead, the "cash equivalent" value of the car or insurance policy will be spread across the 12 months of the tax year and taxed alongside salary.

Phase 2: Starting 6 April 2028

HMRC intends to extend mandatory payrolling to almost all remaining benefits and taxable expenses from April 2028. The exact list for Phase 2 is still being finalised, but the goal is to make the P11D obsolete for the vast majority of UK employers.

What is staying (for now)?

Interestingly, two categories are currently exempt from the 2027 mandatory start date:

1. Employer-provided living accommodation.

2. Employment-related loans (such as interest-free season ticket loans).

These will remain under voluntary payrolling for the time being. If you provide these, you may still need to use the P11D system after 2027, though HMRC is expected to set a mandatory date for these later.

Why the Change? The Benefits for SMEs

While "mandatory" can sound like an extra burden, this shift actually offers several long-term advantages for small business owners:

• Reduced Year-End Admin: No more rushing to complete P11Ds and P11D(b) forms in July. Once the data is in your payroll, the "reporting" happens automatically every month.

• Better Cash Flow for Employees: Employees won't be hit with large, unexpected tax bills because of outdated tax codes. They pay for their benefits as they use them.

• Increased Accuracy: Real-time reporting reduces the risk of errors that occur when trying to remember which employee had which car twelve months after the fact.

• Simpler Class 1A NICs: Under the new system, Class 1A National Insurance Contributions (NICs) will be calculated and paid monthly alongside your usual PAYE liability, rather than as a lump sum in July. If you want a broader breakdown of typical payroll costs, this guide explains what businesses can expect to pay.

Key Challenges for Small Businesses

Despite the benefits, the transition requires a shift in mindset. For many SMEs, benefits data is currently siloed. The HR department (or the owner) might know about a new company car, but that information might not reach the payroll provider until the end of the year.

From 2027, data must flow in real-time. If an employee gets a new car in October, payroll needs to know in October, not the following May.

How to Prepare Your Business

HMRC expects businesses to use the lead-up to 2027 to get their houses in order. Here are the actionable steps you should take now:

1. Audit Your Current Benefits

Make a list of every perk you provide. Who has a car? Who is on the medical plan? Do you provide fuel? Understanding exactly what you provide is the first step to mapping how that data will reach your payroll.

2. Talk to Your Payroll Provider or Accountant

If you use a local accountant or a payroll bureau, ask them about their roadmap for 2027. Most modern payroll software (like Xero, Sage, or QuickBooks) will be updated to handle this automatically, but it’s worth confirming that your current setup is ready for real-time BiK reporting. If you are still comparing providers, our guide to Accounting Services UK: The Complete Guide to Finding the Right Accountant for Your Business can help.

3. Review Your Internal Data Processes

How does information about a benefit change reach the person running payroll? You may need to create a simple internal form or a shared folder where benefit changes are logged instantly.

4. Employee Communication

Start talking to your team early. Explain that from April 2027, they will see their benefits on their payslips. This isn't a "new tax": it's just a different way of paying the tax they already owe. Explaining this early avoids confusion and "why is my take-home pay lower?" questions later.

Important Dates to Remember

• November 2026: A new voluntary registration service for loans and accommodation goes live.

• 5 April 2027: Deadline to register for voluntary payrolling of loans/accommodation if you wish to do so.

• 6 April 2027: Mandatory Phase 1 begins (Cars, Fuel, Medical).

• 6 April 2028: Mandatory Phase 2 is expected to begin.

Final Thoughts: Don't Wait for the Deadline

2027 might feel like a long way off, but for a busy SME, three years can disappear quickly. By streamlining your benefit reporting now, you can remove one of the most tedious administrative tasks from your annual calendar and provide a more transparent experience for your employees.

If you are feeling overwhelmed by these upcoming changes, the best step is to partner with a specialist who understands the nuances of UK tax law. If you need help finding an accountant who handles payroll, it helps to work with someone who understands the nuances of UK tax law. At Accountant Search, we help businesses like yours find the perfect match for their accounting and tax needs.

Whether you need help with SME Tax Services, Payroll & Pensions, or general VAT Advice, we can connect you with an expert who can ensure your business remains compliant and efficient.

Ready to get your payroll ready for 2027? Find a local accountant today.

Written by Richard ( Senior Content Strategist at Accountant Search.)