Employment Tax: When to Hire a Specialist In-House

Employment tax is one of the fastest-growing in-house tax specialisms and one of the most consistently under-resourced. It sits awkwardly between finance, payroll, HR and legal, which means it often belongs to nobody until something goes wrong: a status challenge, a benefits error found across several years, or an unexpected settlement with HMRC. The rules are also moving faster than at any point in recent memory, with employer National Insurance up, umbrella company rules changed, benefits about to move onto payroll and salary sacrifice due to be capped.

This guide sets out what an in-house employment tax specialist actually covers, the signs that justify the hire, how the cost compares with buying advice, where the role should sit, what it pays, and when buying the expertise remains the better answer. If you are weighing up a broader first tax hire, read it alongside our guide to hiring your first in-house tax manager.

What the role covers

Employment tax is wider than most boards assume. Most businesses touch at least five of the areas below without anyone owning the whole picture. Our companion guide to employment tax, IR35 and benefits in kind covers the technical framework; this section describes the workload.

PAYE and National Insurance

Real-time reporting accuracy, tax codes, starters and leavers, and the National Insurance position on every element of pay. Employer Class 1 National Insurance rose to 15% from April 2025, and the secondary threshold fell to £5,000 a year, so employer NIC now applies to almost every pound of pay above a low floor. That change made the cost of getting pay structures wrong materially higher, and it is one reason finance directors now look harder at who owns the area. National minimum wage compliance also belongs here, and it is a genuine risk for businesses with salary sacrifice, deductions from pay or unpaid working time.

Benefits in kind, P11D and the move to payrolling

P11D reporting, PAYE settlement agreements, company car and van treatment, and the perennial question of what is genuinely business expenditure. It is unglamorous and it is the single largest source of routine exposure. The bigger change ahead is mandatory payrolling of benefits. HMRC originally planned for it to start in April 2026, delayed it to April 2027, and in June 2026 confirmed a phased approach. From 6 April 2027, company cars, car fuel, vans, van fuel and employer-provided medical benefits must be reported and taxed through payroll in real time, including Class 1A. From 6 April 2028, most other benefits follow, while beneficial loans and living accommodation remain voluntary to payroll. That is a systems, data and process project, not a form change: someone has to map every benefit, fix the data feeds from HR, fleet and benefits providers, and make sure payroll can handle Class 1A in-year. HMRC’s page on the phased introduction of mandatory payrolling sets out the current position, and final guidance is still being published.

Salary sacrifice and reward structuring

Pension, cycle-to-work, electric vehicles and other sacrifice schemes, and the interaction between the reward the business wants to offer and the tax cost of offering it that way. The November 2025 Budget announced that from April 2029 only the first £2,000 a year of pension contributions made through salary sacrifice will be free of National Insurance; amounts above that will attract employee NIC and employer NIC at 15%. Government has said further guidance will follow before then. For businesses that rely on generous sacrifice arrangements, that is a reward redesign question that needs modelling well ahead of the date.

Termination payments

Settlement agreements, the £30,000 exemption, post-employment notice pay, Class 1A on the excess and the treatment of payments in lieu of notice. Restructuring programmes create a burst of this work, and getting the split between contractual and non-contractual elements wrong is a common and avoidable error.

Share schemes and EMI reporting

Enterprise Management Incentive grants, CSOPs, growth shares and unapproved options, together with valuations, the annual share scheme returns and the tax on exercise. EMI options granted from 6 April 2024 no longer need to be notified within 92 days; the notification is due by 6 July after the end of the tax year of grant, alongside the annual return. Missed or defective filings can cost employees the tax advantage, which turns a compliance slip into an employee relations problem. HMRC’s guidance on tax and employee share schemes sets out the scheme types.

Employment status, IR35 and off-payroll working

Determining status for contractors and consultants, maintaining the determinations and defending them. For medium and large businesses, responsibility sits with the engager, and the determination must reflect the actual working arrangement, as HMRC’s off-payroll working guidance sets out. Status determination statements, a disagreement process and evidence of reasonable care all need an owner.

Umbrella companies and labour supply chains

From 6 April 2026, where a worker is supplied through an umbrella company, the recruitment agency that contracts with the end client becomes jointly liable for PAYE and National Insurance the umbrella fails to pay, and where no agency is involved the end client takes that liability. HMRC’s guidance on PAYE rules for labour supply chains that include umbrella companies explains the detail. Businesses with large temporary or contract workforces now need supply chain due diligence that previously sat with procurement, if anywhere.

Global mobility

Short-term business visitors, cross-border remote workers, social security certificates, shadow payrolls and registration obligations abroad. This area has grown fastest since remote working became normal, and it is where businesses most often carry exposure they have not identified: an employee working from another country for months can create payroll, social security and even corporate tax obligations there.

Signs you need an in-house specialist

Any two of these together usually make the case for at least a serious look at the hire.

• A contractor population of any size. Twenty or more engagements needing status determinations, maintained and defensible, is a recurring workload rather than an annual exercise.
• Adviser spend approaching a salary. Employment tax advice is bought by the hour and the hours accumulate quietly across P11D season, status queries, share scheme questions and settlement agreements. Add up last year’s spend before assuming a hire is unaffordable.
• An HMRC enquiry or settlement. Businesses that have been through one rarely go back to having nobody own the area, and the remediation work itself often justifies twelve months of a specialist.
• Internationally mobile employees. More than a handful of people working across borders creates obligations in several jurisdictions, and the gap between what businesses think they owe and what they actually owe is widest here.
• A reward change on the horizon. Introducing a share scheme, restructuring benefits, preparing for payrolled benefits from 2027 or rethinking salary sacrifice ahead of the 2029 cap. Designing that well needs in-house judgement rather than a series of hourly opinions.
• A large temporary or agency workforce. The April 2026 umbrella rules put supply chain risk on the agency or the end client, and someone has to own the checks.
• Payroll that runs well but nobody checks the tax. A capable payroll manager processes what they are given; they are rarely asked to challenge whether a payment should be taxed that way in the first place.

Adviser vs in-house: what it costs

The most straightforward test is money. In our experience an in-house tax hire becomes worth it over adviser fees from about £100,000 to £110,000 a year of tax spend, and employment tax follows the same logic. The reason the break-even sits above the salary is that an employee costs more than their headline pay, and even a good in-house specialist will still buy some specialist opinions.

An illustration, using a Tax Manager on £70,000 in London:

Cost item	Approximate annual cost
Base salary	£70,000
Employer NIC at 15% above £5,000	£9,750
Employer pension (5% illustration)	£3,500
Training, subscriptions, software, CPD	£3,000–£6,000
Residual specialist advice (contentious points, overseas)	£10,000–£20,000
Total	roughly £96,000–£109,000

The figures are indicative and exclude recruitment fees and management time. They show why a business spending £40,000 a year with advisers should not hire, while one spending £120,000 almost certainly should. Between those points, the deciding factor is usually not cost but control: an in-house specialist sees problems before they become questions, which hourly advice cannot do.

The hidden cost on the other side is unowned risk. A benefits treatment wrong for four years, a contractor population with no defensible determinations, or an overseas payroll obligation nobody registered for can each produce a settlement larger than several years of salary. Our guide to managing external tax advisers covers how to get more from the advisers you keep.

Where the role sits

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

Within the tax function, reporting to the Head of Tax or an 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.

Within HR or reward, which happens in larger organisations. It brings the role closer to where decisions are made and further from where compliance risk is measured, and it only works where the relationship with finance 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 give the role explicit sponsorship from the FD or CFO, so that a status determination or a benefits treatment is not negotiable by the department that finds it inconvenient. If you are building a fuller team, our guide to building a scalable tax team covers sequencing.

Roles and pay

Employment tax roles are benchmarked within the general in-house tax bands rather than as a separate scale. An Employment Tax Manager sits within the Tax Manager and Senior Tax Manager bands below, depending on scope; candidates with deep global mobility or share scheme experience tend to sit higher in the range because the pool is small. Full benchmarks are in our in-house tax manager salary guide.

Role	Typical package	Employment tax fit
Tax Manager	£60k–£80k	Employment tax manager owning PAYE, benefits and status
Senior Tax Manager	£75k–£100k	Employment tax lead adding share schemes, mobility, reward design
International / transfer pricing specialist	£85k–£120k	Global mobility heavy roles in multinational groups
Head of Tax	£95k–£140k	Head of employment tax or reward tax in larger groups
Interim tax specialist	£450–£700 a day	Status reviews, payrolling projects, remediation

A CTA qualification typically adds £8,000 to £18,000 to a package at equivalent experience. Interim rates are covered in more detail in our guide to interim tax day rates, and director-level searches are covered at employment tax director recruitment.

When buying it in is still right

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

Where the workload is genuinely annual, such as P11Ds, a PAYE settlement agreement 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, such as a status review across the contractor base, a payrolling-of-benefits readiness project, an international footprint assessment or a benefits health-check, the work is bounded with a clear deliverable, which is exactly what interim tax professionals suit. And where a question is genuinely contentious and you want an opinion backed by professional indemnity, a firm remains the right answer.

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

Test three things beyond the technical. First, 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. Second, 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. Third, documentation discipline, because employment tax positions are defended years later on the strength of what was written at the time. A fourth question now earns its place: ask how they would prepare a payroll for mandatory benefits reporting, which separates people who have run projects from people who have only completed returns. Our in-house tax interview questions guide covers the wider sequence.

The usual qualification is CTA from the Chartered Institute of Taxation, or ATT, ICAEW or ACCA with genuine employment tax experience. Some of the strongest candidates are ex-HMRC or come from Big Four employment tax teams; for the latter, our guide to moving from practice tax to in-house explains what they will expect from the move.

A practical first step

Before deciding about hiring, spend an afternoon on two lists. The first is what was spent on employment tax advice last year, including payroll bureau extras, share scheme valuations and legal fees on settlement agreements. The second is every area in this guide, with the name of the person who owns it. Gaps on the second list and a large number on the first usually make the decision. If the second list is mostly blank, a short interim review is often the best way to size the problem before committing to a permanent role.

Frequently asked questions

At what level of adviser spend should we hire in-house?

As a rule of thumb, from about £100,000 to £110,000 a year of tax advisory spend. Below that, a hybrid of in-house compliance and bought-in advice is usually cheaper; above it, the fully loaded cost of a tax manager plus some residual advice tends to be lower than continuing with fees.

What does an employment tax manager earn?

Employment tax managers sit within the general Tax Manager band of £60,000 to £80,000 and, with wider scope, the Senior Tax Manager band of £75,000 to £100,000. A CTA typically adds £8,000 to £18,000. Interim specialists typically charge £450 to £700 a day.

When does mandatory payrolling of benefits start?

In phases. From 6 April 2027, company cars, car fuel, vans, van fuel and medical benefits must be payrolled. From 6 April 2028, most other benefits follow. Beneficial loans and living accommodation stay voluntary. HMRC is still publishing final guidance, so check its current position before finalising a project plan.

Does the umbrella company change affect businesses that do not use agencies?

Yes, if you engage workers through umbrella companies directly. From 6 April 2026, where no agency is involved, the end client can be liable for PAYE an umbrella company fails to pay.

Can our payroll manager own employment tax?

Partly. A strong payroll manager can own processing accuracy, RTI and much of the benefits data. Status determinations, share schemes, termination structuring and global mobility usually need tax-trained judgement and the standing to challenge other departments.

Is interim a sensible way to start?

Often. An interim specialist can review status, benefits and mobility exposure over a few months, fix the urgent issues and leave a clear view of whether a permanent role is needed and at what level.