What triggers an HMRC IR35 investigation?

Qdos Consulting

Contractors can trigger an IR35 investigation as a result of working in a particular sector, because of the work of HMRC's Transparent Benchmarking team, or though exhibiting behaviours that HMRC can monitor and use to refine their risk profiling and IR35 targeting.

“The triggers of an IR35 review can be either direct, because a contractor meets HMRC’s IR35 risk criteria, or indirect, as a result of another investigation, such as into corporation tax, VAT or payroll,” explains Qdos Consulting’s IR35 expert Andy Vessey.

“And with four specialist IR35 teams at HMRC focusing specifically on contractors, contractors should take appropriate measures to avoid IR35 investigations,” he warns.

HMRC has gathered together all of its IR35 guidance and links to online resources into a single document, Intermediaries Legislation (IR35) - Working through an intermediary, such as a Personal Service Company, published in June 2014.

HMRC’s sector campaigns

According to Vessey, one of the key criteria guiding HMRC when targeting contractors is the sector in which they work. And sectoral risk assessment and targeting are not just restricted to contractors.

“HMRC targets sectors its risk profiling teams identify as being at high risk of non-compliance activity,” he says. “Campaigns have included doctors, dentists, teachers and trainers, and health professions such as physiotherapists, as well as restaurants in London and haulage firms in the Midlands.”

HMRC has adopted a strategy of targeting sectors its risk profiling teams have identified as being at high risk of non-compliance activity

Andy Vessey, Qdos Consulting

Vessey also notes that specific sectors can also be targeted as a result of media pressure that leads to Government action. Contractors in the public sector came under the spotlight as a result of the off-payroll rules and the Treasury investigation that preceded them.

“Public sector organisations were required to identify off-payroll workers working for them, which in effect meant contractors. This highly specific information about contractors working in the public sector was passed to HMRC. In this case the taxman used this data to open hundreds of IR35 reviews.”

Data mining and analysis

Vessey highlights that the days of the random inspection are over: “Once, local tax inspectors might open a certain number of random inspections on their patch into corporation tax, VAT or Pay As You Earn (PAYE) income tax, and these had the potential to catch contractors.

“Those days are long gone, because HMRC lacks the resources and there are much more efficient methods of targeting now available. HMRC’s risk assessment is conducted at a regional and national level using hugely sophisticated software able to analyse all public sector databases and identify discrepancies.”

Vessey warns that contractors who have filed incorrect information or different types of tax paperwork that do not tally will almost certainly be flagged by the software for an inspector to review their file and make a decision on whether to investigate. A contractor business with wildly fluctuating profits or expenses may also cause HMRC to look closer.

Don’t give the taxman a reason to notice you

“Contractors should maintain high quality and accurate business records and use the services of a professional to ensure their information is filed correctly. Otherwise they could be inviting a tax inspector to come and investigate their business,” Vessey continues.

“If there are exceptional figures in the accounts and tax return, such as dramatic increases or falls in sales profits or expenses, contractors should include a note in the supplementary section of the corporation tax return explaining the reasons for the change. This may convince an inspector to pass over their business for review.”

In Vessey’s experience, if an inspector’s attention is caught by another aspect of a contractor’s tax, such as corporation tax, VAT or PAYE, once the taxman knows they are dealing with a contractor it almost invariably ends up being referred to an IR35 specialist team.

Real time information (RTI) and the service company question

In addition to business records held on online databases that HMRC data mines, contractors should ensure they file accurate and timely real time information (RTI) submissions and accurately answer the personal services company question on their tax returns.

“Although RTI means that contractors will no longer file a P35 with the service company question, they will have the same question to answer at the time of their final return for a tax year under RTI and on their and personal self assessment tax return,” explains Vessey.

“Despite tax barrister Keith Gordon’s successful campaign to prove that contractors cannot be compelled to answer the service company question, in practice contractors should be honest and fill it in. Failing to complete the question simply places further doubt in an inspector’s mind and could be the trigger for an investigation.”

Vessey adds that although the P35 has gone, contractors still have RTI and should rigorously file submissions: “If a contractor consistently fails to get RTI right, the taxman immediately wonders what else the contractor is getting wrong, so they shoot up the inspector’s risk profile rating.”

The business entity tests (BETs)

Vessey emphasises that the business entity tests introduced in May 2012 were never intended to be a kind of IR35 test, but are a risk profiling tool designed by HMRC to assess the risk that a contractor may be inside IR35: “No-one knows what HMRC’s IR35 risk criteria are, but we do know HMRC has IR35 risk assessment teams that use the BETs as part of their overall toolkit to assess risk.

“A contractor asked by HMRC to complete the tests who scores in the intermediate and high risk area is much more likely to suffer an IR35 review. However, there are many contractors who score high risk in the BETs and who are manifestly outside IR35.”

Assuming the contractor is well prepared and adopted IR35 best practice, involving an IR35 expert at the outset will generally quash any review. The BETs are of greatest use to contractors as an indicator of what sorts of behaviours HMRC will see as evidence of disguised employment.

The Transparent Benchmarking Team

HMRC has a team that focuses its efforts on working out average financial performance ratios of different types of businesses based on the huge amount of data it has collated from corporation tax returns, personal self assessment tax returns and the returns filed by sole traders.

The team has profiled some trades and professions, such as driving instructors and painters and decorators, with a view to identifying the average profitability of businesses in these areas. It is likely that businesses such as 'IT consultants' and 'engineering consultants' are on this team's hit list.

If so, contractors who are showing profits and business costs and expenses that are significantly different may start to receive letters asking them why they vary from the benchmarks of their type of business established by the team.

IR35 contract review service and anonymous tip-offs

Vessey urges contractors not to use HMRC’s IR35 contract review service because he believes it acts as a source of leads for the four central compliance teams: “The IR35 helpline could either be the prevention or trigger of an enquiry. If the contractor’s contract is outside IR35, then HMRC promises not to investigate for three years.

“And of course HMRC promises that callers’ details are not passed onto IR35 inspector colleagues. But those high risk contractors using the service face an even greater risk. If an HMRC officer reviews a contractor’s contract and finds it places the contractor at high risk of being inside IR35, of course they are going to forward the details to their IR35 colleagues. I certainly don’t trust them not to.”

Andy Vessey

Andy Vessey

Client Services Manager

Qdos Consulting Limited

Andy is a Senior Tax professional at Qdos and has a wealth of experience in IR35 and status matters which he guides the firm on.

Qdos Consulting is a leading expert in status and IR35. The company also consults in taxation and employment lawand provides low cost business insurance for contractors. Read Full Profile...

View all our experts


Interestingly, Vessey identifies a final trigger for IR35 investigations: tip-offs. “Disgruntled spouses or partners have been known to anonymously tip-off HMRC about their spouse/partner’s financial affairs.

“Ordinarily an anonymous tip-off would start as an income tax or corporation tax investigation, but once the inspector knows a contractor is involved, they will call in the specialist IR35 units.”

Alliance Accountants

Updated: Wednesday, August 20, 2014

© 2014 All rights reserved. Reproduction in whole or in part without permission is prohibited. Please see our copyright notice. If you want to use any content you have seen on this site then please request our media pack and ask for details of our Content Licencing Service.

Inni Accounts

Readers Comments...

Bookmark and Share

Latest Site Updates

Denying travel and subsistence tax relief to contractors is madness Denying travel and subsistence tax relief to contractors is madness

Contractors who lose tax relief on their legitimate travel and subsistence expenses won’t take it on the chin – contracting will descend into chaos.

ContractorCalculator: Contracting news in brief – 19/Dec/2014 ContractorCalculator: Contracting news in brief – 19/Dec/2014

News this week covers: expenses tax relief threatened; new subcontracting rules; demand in Scotland; oil & gas rate cuts; and financial IT demand.

Limited and umbrella company contractors unaffected by expenses consultation response Limited and umbrella company contractors unaffected by expenses consultation response

Limited company and umbrella company contractors are unlikely to be affected by the government’s response to the OTS expenses exemptions consultation.

Contractor travel and subsistence tax relief threatened by government consultation Contractor travel and subsistence tax relief threatened by government consultation

Limited company and umbrella company contractors face having tax relief on travel and subsistence withdrawn according to new government consultation.



Follow Us On Twitter



Contractor solutions

IR35 Report - 15 Years Contractors Handbook IR35 Test Clever Accounts Accountants Checklist Alliance Accountants

Contractor solutions

Contractor Angels

More than just an Umbrella. Retain up to 90% of your earnings.

Clever Accounts

Complete contractor accounting service. 24/7 online access. £69 pm!

Contractor Accountant

Free consultation, incorporation and IR35 reviews. Find out more…

Parker Cavendish

Contractor accountants - free company set up. Call for free consultation

InTouch Accounting

Perfect mix of technology & personal service for only £92 per month.


The UK’s largest employment organisation - 0% risk, 100% compliance

Need an accountant?

Comprehensive service for £59 per month. Call now for a FREE consultation.

NA Bedouin Group Parker Cavendish D J Colom Accountants Contractor Financials NewsNow
Caprica Accountants Parker Cavendish Contractor Insurance Life Insurance


The UK's leading contractor site. Independently audited traffic (ABC) – 124,827 monthly unique visitors.