UK mandatory BIK payrolling starts in phases from April 2027

UK employers that provide company cars and fuel, vans and fuel, or private medical insurance and benefits must report and tax those benefits through payroll from 6 April 2027, HMRC’s first mandatory benefits-in-kind (BIK) phase.

A second phase on 6 April 2028 will cover all other BIKs except beneficial loans and accommodation. The timetable changes how employers value benefits, collect employee income tax and manage Class 1A National Insurance contributions.

The staged rules also require benefits data to feed monthly Real Time Information, or RTI, submissions. Payroll, HR and finance teams must connect those processes before April 2027 rather than rely on year-end reporting.

What changed?

HMRC initially intended to introduce mandatory payrolling in April 2026. Employer organisations’ lobbying led the agency to postpone and restructure the launch into two phases beginning 6 April 2027. The rollout also forms part of HMRC’s strategy to modernise tax collection.

HMRC says the change is “a big change for many employers.” Mandatory payrolling requires employers to tax and report benefits through payroll instead of annually on form P11D. The agency also notes that employers can value, tax and report some benefits more easily this way.

A BIK is an employer-provided benefit that is neither salary nor a bonus, including company cars, private medical insurance and corporate gym memberships. HMRC treats its value as taxable income even when the employee receives no cash.

Under the historical process, employees either ask HMRC to amend their tax code so the BIK is taxed through PAYE, or report it on their self-assessment return. Employers calculate Class 1A NICs and report them on form P11D(b).

Payrolling offers an alternative to reporting BIKs on form P11D after tax year end. Employers tax the benefits through business payroll and RTI submissions, a voluntary route available for several years that many larger companies have chosen.

Which benefits move, and when?

• 6 April 2027 — Phase 1: Company cars and fuel; vans and fuel; private medical insurance and benefits.
• 6 April 2028 — Phase 2: All other BIKs except beneficial loans and accommodation.

The phased approach gives employers two operational choices. They can move only Phase 1 benefits into payroll while retaining the P11D method for the remaining benefits, or transition all BIKs to payroll.

Employers using voluntary payrolling for non-mandatory benefits must also consider registration requirements. They therefore face a staged choice: maintain P11D for benefits not yet mandatory, or bring those benefits into payroll voluntarily once registered.

What should employers test before April 2027?

TaxAssist Accountants identifies five implementation factors employers should assess:

• Which benefits the employer offers and whether its mix will change.
• Whether payroll software can value, tax and report each required benefit through RTI.
• Registration for voluntary payrolling of non-mandatory BIKs.
• Staff capacity to handle the additional monthly work.
• Ease of communicating the tax and cash-flow change to employees.

These checks should answer a concrete capability question. Can the payroll system value every Phase 1 BIK each month, feed accurate RTI data, and calculate employee tax and Class 1A NICs without disrupting excluded benefits?

The review should compare each benefit’s valuation and reporting route against the employer’s actual system. Payroll software capability and voluntary registration matter because the phased rules do not apply equally to every benefit.

Staff capacity and communication planning matter equally. Monthly tax deductions will change employees’ cash flow, while monthly employer NIC payments will change payroll workload and business cash flow.

TaxAssist Accountants advises: “Seek professional advice early, as advisors will get busy as the April 2027 Phase 1 date grows closer.”

Where are the cash-flow and compliance risks?

Covered employees will start paying income tax on BIKs through monthly deductions, replacing an annual self-assessment payment or a PAYE code adjustment in the following year. Employers must explain that change before Phase 1 starts, particularly where staff expect an annual tax settlement.

Employers with covered benefits must also value BIKs and pay Class 1A NICs throughout the tax year. That adds work to payroll teams and affects the business’s monthly cash flow.

Without advance preparation, employers may lack both the payroll functionality required for the new route and the monthly data needed to report BIK values. HMRC corrections can consume staff time and money.

Poor communication can also provoke employee discontent and reduce productivity. Employers should treat the tax change as an employee-relations issue, not only a payroll configuration task.

For employers seeking outside support, TaxAssist Accountants lists payroll setup and optimisation, compliance assurance and ongoing HMRC support, with enquiries through 0800 0523 555. The due-diligence question is whether a provider can test the full payroll-to-RTI workflow, not merely configure software.

Employers that answer those questions now should be ready to value, tax and report Phase 1 benefits when mandatory payrolling begins on 6 April 2027.