Employment Tax: When to Hire a Specialist In-House

Employment tax is the fastest-growing of the in-house tax specialisms and the one businesses most consistently under-resource. It sits awkwardly between finance, payroll, HR and legal, which means it frequently belongs to nobody until something goes wrong — a status challenge, a benefits error discovered across several years, or an unexpected settlement. This piece sets out what an in-house employment tax specialist actually covers, the triggers that justify the hire, what it costs, and when buying the expertise remains the better answer.

What the role covers

Five areas, and most businesses touch at least three of them without anyone owning the whole picture.

Employment status and off-payroll working. Determining status for contractors and consultants, maintaining the determinations, and defending them. For medium and large businesses the responsibility sits with the engager and the determination must reflect the actual working arrangement, as HMRC’s off-payroll guidance sets out. Our guide to employment tax, IR35 and benefits in kind covers the framework.

Benefits in kind and expenses. P11D reporting, PAYE settlement agreements, company car and van treatment, and the perennial question of what is genuinely business expenditure. Unglamorous and the single largest source of routine exposure.

Salary sacrifice and reward structuring. Pension, cycle schemes, electric vehicles, share schemes — and the interaction between the reward the business wants to offer and the tax consequence of offering it that way.

Internationally mobile employees. Short-term business visitors, cross-border remote workers, social security positions and payroll registration obligations abroad. This has grown fastest since remote working normalised, and it is the area where businesses most often have exposure they have not identified.

And PAYE compliance and governance. Real-time reporting accuracy, national minimum wage compliance — a genuine risk for businesses with salary sacrifice or unpaid working time — and the documentation that supports positions taken.

The triggers that justify a hire

Five, and any two together usually make the case.

A contractor population of any size. Twenty-plus engagements requiring status determination, maintained and defensible, is a recurring workload rather than an annual exercise.

Adviser spend approaching a salary. The most straightforward test. Employment tax advice is bought hourly and the hours accumulate quietly across P11D season, status queries and ad-hoc questions. Add up what was spent last year before assuming a hire is unaffordable.

An enquiry, or a settlement. Businesses that have been through one rarely go back to having nobody own the area, and the remediation work itself frequently justifies twelve months of a specialist.

Internationally mobile employees. More than a handful of people working across borders creates obligations in multiple jurisdictions, and this is the area with the widest gap between what businesses think they owe and what they actually owe.

Or a reward strategy the business wants to change — introducing share schemes, restructuring benefits, moving to salary sacrifice at scale. Designing that well is worth in-house judgement rather than a series of hourly opinions.

Where the role sits

Three configurations, and the choice matters more than it appears.

Within the tax function, reporting to the Head of Tax or in-house tax manager. Technically coherent, and the arrangement where the role has most credibility on judgement.

Within finance, reporting to the Financial Controller or Finance Director. Common where there is no wider tax function, and it works provided the person has enough standing to challenge HR and operations.

Or within HR or reward, which happens in larger organisations. It brings the role closer to where the decisions are made and further from where the compliance risk is measured — and it works only where the finance relationship is genuinely strong.

The recurring structural problem is the same in all three: employment tax sits across four functions and the person owning it usually has authority over none of them. The businesses where it works are the ones where the role has explicit sponsorship from the FD, so that a status determination or a benefits treatment is not negotiable by the department that finds it inconvenient.

What it costs

Level	London	Regional UK
Employment Tax Analyst / Senior	£48k–£62k	£42k–£54k
Employment Tax Manager	£68k–£92k	£58k–£78k
Senior Manager	£90k–£118k	£78k–£100k
Head of Employment Tax / Director	£115k–£165k	£98k–£140k
Interim (day rate)	£450–£675	£400–£575

Employment tax prices above general corporate tax at equivalent seniority, reflecting scarcity: the pool is smaller and demand has grown faster than supply. Benchmarks across the tax function are in our in-house tax manager salary guide, and the practice is covered at employment tax recruitment.

When buying it in is still right

Being honest about this matters, because most businesses do not need a permanent hire.

Where the workload is genuinely annual — P11Ds, a PSA, and a handful of queries — external advice or a short interim engagement around the deadline is proportionate and cheaper.

Where a one-off exercise is needed: a status review across the contractor base, an international footprint assessment, a benefits health-check. Bounded work with a deliverable, which is exactly what interim suits.

And where the question is genuinely contentious and you want an opinion with professional indemnity behind it, a firm remains the right answer — as our guide to managing external tax advisers covers.

The pattern that works for most mid-market businesses is a hybrid: the compliance cycle owned in-house by finance or an existing tax manager, with specialist input bought for the difficult judgements. The permanent hire becomes justified when the difficult judgements stop being occasional.

Hiring for it

Three things to test beyond the technical. Cross-functional credibility — ask about a time they told HR or a business unit that something could not be done the way it was proposed, and what happened. Practical judgement on status: ask how they would approach a review of an existing contractor population, and listen for whether they start with the contracts or the working arrangements. And documentation discipline, because employment tax positions are defended years later on the strength of what was written at the time. Our in-house tax interview questions guide covers the wider sequence.

Qualification is usually CTA from the Chartered Institute of Taxation, or ICAEW / ACCA with genuine employment tax experience — and, as in investigations, some of the strongest candidates are ex-HMRC with neither.