Payrolling Benefits in Kind Readiness Calculator

Phase 1 starts on 6 April 2027 and phase 2 on 6 April 2028. This is worth being precise about, because the date has moved twice. HMRC originally announced mandation from April 2026, then deferred it by a year to April 2027 to give employers and software providers more time, and then split it into two phases. So if you are working from guidance written in 2024 or early 2025 that says April 2026, that guidance is out of date. Nothing becomes compulsory in the 2026/27 tax year — you can still payroll voluntarily this year if you registered by 5 April 2026, but you are not obliged to.

Phase 1, from 6 April 2027, covers five things: company cars, car fuel, company vans, van fuel and employer-provided medical benefits. That is the whole of phase 1 — nothing else is compulsory in 2027/28. Phase 2, from 6 April 2028, brings in most remaining benefits in kind and taxable employment expenses. HMRC picked the phase 1 five deliberately: they are the highest-volume benefits and the ones payroll software already handles best. If your only taxable benefit is, say, gym membership, you have nothing to do until 2028.

Yes, two. Employment-related loans and living accommodation are excluded permanently, not just deferred. HMRC accepts they are, in its words, particularly burdensome to payroll — a beneficial loan balance moves every time a repayment is made, and accommodation involves an annual value plus an additional yearly rent charge that is awkward to spread across pay periods. Both stay on the P11D under the existing end-of-year process. You can payroll them voluntarily if you want to, but you have to register first, which you cannot do mid-year.

Not for the mandated benefits. From 6 April 2027 the five phase 1 benefits are payrolled automatically — there is no registration step, because it is no longer optional. Registration only matters if you want to voluntarily payroll the two excluded benefits, loans and accommodation. HMRC opens that service in November 2026 and the deadline is 5 April 2027 for the 2027/28 tax year. Registration always has to be completed before the tax year begins; there is no way in.

The Class 1A rate is 15% for 2026/27, in line with the Class 1 secondary rate. Mandation does not change the amount of Class 1A you owe — it changes when you pay it. Today you pay it once a year by 22 July following the tax year. From 6 April 2027 you report and pay it in real time through the Full Payment Submission, spread across every pay period. The genuine cash cost is the transition: in July 2027 you settle the 2026/27 Class 1A bill under the old system while already paying real-time Class 1A on 2027/28 benefits. On a £100,000 benefits bill that is £15,000 of Class 1A hitting alongside roughly four months of real-time contributions.

Yes, in most cases. Benefits provided in 2026/27 are reported on a P11D by 6 July 2027 regardless. After that, you still need P11D reporting for anything outside the mandate — the phase 2 benefits until 6 April 2028, and loans and accommodation indefinitely unless you register to payroll them. HMRC has confirmed the FPS replaces P11D reporting for mandated benefits but has not yet published the final position on the P11D(b) return itself, so treat the year-end return as still required until HMRC says otherwise.

The timing of their tax, not the amount. Today HMRC estimates the value of an employee’s benefits, bakes it into their tax code, and collects the tax through a code adjustment that runs roughly a year behind reality. From 6 April 2027 the taxable value is added to taxable pay in the period the benefit is provided, so tax is collected as it arises. HMRC automatically removes the benefit deductions from tax codes before the start of the year. The uncomfortable part is the overlap: an employee can spend 2027/28 paying real-time tax on this year’s benefits while a code adjustment is still collecting an underpayment from an earlier year. HMRC’s systems do not strip those historic underpayments out. Tell people about this before they see it on a payslip.

PAYE has an overriding limit: you must not deduct more than 50% of an employee’s gross pay as tax in any one pay period. It exists so nobody is left without enough to live on. If a benefit pushes the deduction above that ceiling — most likely with a company car given to a lower-paid employee, or someone on reduced pay through sickness or family leave — you carry the excess forward into later pay periods in the same tax year. Anything still uncollected at the year end is picked up by HMRC directly through the P800 end-of-year reconciliation or Simple Assessment. You do not chase it, and you must not exceed the limit to force it through.

HMRC has taken a power to modify the Schedule 24 Finance Act 2007 inaccuracy penalties so that non-deliberate errors do not attract a penalty for a limited period of roughly 1 year from the start of mandation. That is a soft landing for genuine mistakes, not for failing to report at all, and it does not cover deliberate inaccuracies or late payment interest. Corrections are made through the normal RTI correction route by submitting a revised Full Payment Submission for the period concerned.

Four things, in order. First, list every benefit you provide and mark which of them would appear on a P11D — you cannot payroll what you have not catalogued. Second, map how the data reaches payroll: for medical insurance that is usually a broker file, for cars a fleet system, and both need to arrive before the payroll cut-off every period rather than once a year. Third, get a written commitment from your payroll software provider on the release date; HMRC issues the technical specifications to providers in autumn 2026, so you should have an answer by the end of that year. Fourth, brief employees well before 6 April 2027. Registration is only on the list if you provide loans or accommodation and want to payroll them voluntarily, in which case the deadline is 5 April 2027.