IR35 reform has done more damage to the UK technology sector than any single piece of legislation in the last twenty years. That is not hyperbole. I have watched it unfold from the inside, as both a contractor and someone who hires contractors, and the results have been exactly as bad as everyone predicted they would be. Worse, actually, because the second order effects are only now becoming properly visible.
For those who are not familiar, IR35 is a set of rules that determine whether a contractor is genuinely self employed or is actually a disguised employee for tax purposes. The rules have existed since 2000, but in April 2021 the government shifted responsibility for determining a contractor's status from the contractor to the hiring company. On paper, that sounds reasonable. In practice, it has been catastrophic.
Blanket determinations killed the market overnight
Here is what actually happened. Large companies looked at the new rules, consulted their lawyers, and got the advice you would expect from lawyers: reduce risk at all costs. So they issued blanket inside IR35 determinations for every single contractor, regardless of how they actually worked. Banks, insurance companies, consultancies, government departments. Almost overnight, thousands of genuinely self employed contractors were told they would need to work through umbrella companies or go on payroll.
The result was predictable. The best contractors, the ones with real options, left. Some went abroad. Some moved to countries that actually want skilled tech workers. Others set up product businesses because they figured if they were going to be taxed like employees, they might as well build something they own. The contractors who stayed saw their take home pay drop by 20 to 30 percent for doing exactly the same work.
I wrote about the UK's developer shortage previously, and IR35 has made that problem significantly worse. You cannot simultaneously shrink the available talent pool and wonder why projects take longer and cost more.
Companies are paying more for worse outcomes
This is the part that baffles me about the government's position. They pushed IR35 reform to collect more tax revenue. But the companies who used to hire contractors outside IR35 are now paying agencies and consultancies instead, often at higher day rates because those firms need their margin too. The contractor still gets paid. There is just an extra layer of cost in the middle that produces no value whatsoever.
I have seen this on Dynamics 365 projects repeatedly. Before IR35 reform, a company could hire two or three specialist contractors directly, get the work done in three months, and move on. Now that same company goes to a consultancy, pays 30 percent more per head, gets consultants who may or may not have the specific experience needed, and the project takes five months. The tax take might be marginally higher per individual, but the overall economic cost is dramatically worse.
And that is before you factor in the compliance overhead. Companies now employ entire teams to assess IR35 status, manage umbrella company relationships, and deal with the constant anxiety of getting a determination wrong. HMRC can come back years later and say actually, that determination was incorrect, here is a tax bill with interest. No wonder most companies just said "everyone is inside" and called it a day.
The brain drain is real and accelerating
I know personally at least a dozen highly skilled developers and architects who have left the UK since 2021, and every one of them cites IR35 as a significant factor. Not always the only factor, but always on the list. These are people billing four hundred to eight hundred pounds a day, paying substantial amounts of corporation tax and VAT, employing accountants, running legitimate businesses. They were net contributors to the economy by any measure.
Where did they go? The Netherlands, Portugal, Spain, Dubai, Singapore. Countries that either have more favourable tax treatment for skilled workers or simply do not treat every contractor like a potential tax cheat. The UK technology sector is now competing for talent against countries that actively want these people, while we are doing everything we can to push them away.
The irony is painful. The government says it wants to make the UK a technology hub. It says it wants to attract global talent. It says it wants innovation and growth. Then it implements policies that make the UK actively hostile to the very people who drive that growth. The disconnect between what politicians say and what they actually do is staggering.
Small businesses got caught in the crossfire
IR35 reform was supposedly aimed at large companies and disguised employment arrangements. But the collateral damage to small businesses has been enormous. If you run a genuine consultancy with four or five clients, your own equipment, your own insurance, and your own office, you are exactly the kind of person the legislation claims not to target. In practice, it does not matter. Your clients cannot be bothered to assess your status individually, so you get the same blanket determination as everyone else.
I run multiple businesses and I have seen this from every angle. Clients who want to engage me as a specialist consultant, who value the flexibility and expertise I bring, but whose procurement departments will not sign off because their IR35 policy says no outside IR35 engagements. The work still needs doing. It just costs them more and takes longer because they have to route it through approved channels.
HMRC's track record speaks for itself
If the government was at least competent at enforcing these rules fairly, there might be an argument for putting up with the disruption. But HMRC's own track record in IR35 tribunals is dismal. They have lost the majority of high profile cases they have brought, which tells you everything about how well they understand the legislation they wrote.
The CEST tool, HMRC's own online assessment for determining IR35 status, has been widely criticised as unreliable. Contractors and businesses cannot even get consistent results from the government's own system. When your enforcement tool gives different answers depending on how you phrase the question, you do not have a tool. You have a random number generator with a government logo on it.
What should actually happen
The realistic fix is not abolishing IR35 entirely, though I would not complain. Disguised employment is a real thing and it is fair to address it. But the current approach of making every hiring company a tax inspector is idiotic. Here is what would actually work.
First, move responsibility back to the contractor. If someone is genuinely self employed and running a real business, they should determine their own status and be responsible for getting it right. If HMRC disagrees, they can investigate. That is how it worked before and the sky did not fall in.
Second, create a proper safe harbour. If a contractor has multiple clients, provides their own equipment, controls how and when they work, and carries genuine financial risk, they should be clearly outside IR35. No ambiguity, no need for expensive legal opinions, no blanket determinations out of fear.
Third, stop treating contractors as a revenue problem to be solved. The UK freelance and contracting sector contributes billions to the economy. These people pay tax. They create jobs. They fill skills gaps that permanent hiring cannot address. Treating them all as tax dodgers is not just wrong, it is economically illiterate.
The damage is done but it does not have to be permanent
Five years on from the private sector rollout, the UK tech contracting market is a shadow of what it was. Day rates have increased to compensate for the additional costs, which means clients pay more. The tax take has not increased by anything close to what was projected. And the best talent is either abroad or has moved into product businesses where they no longer need to deal with any of this nonsense.
I am not optimistic that any government will fix this soon. Neither major party has shown any interest in listening to the contracting community, and the issue is too niche to become an election priority. But if the UK is serious about being a technology leader, it needs to accept that flexible, skilled, independent workers are a feature of a healthy economy, not a bug to be regulated out of existence.
For more on the challenges facing UK entrepreneurs and the tech sector, have a look at my post on why UK small business policy is failing entrepreneurs. The pattern is the same: politicians who have never built anything making rules for people who build things every day.
