Contractors IR35

IR35: What`s happened so far?

With the off-payroll reforms to the private sector only 2 months away, we thought now would be a good time to look back over the history of IR35, which first came into…

Olivia Bufton by Olivia Bufton

With the off-payroll reforms to the private sector only 2 months away, we thought now would be a good time to look back over the history of IR35, which first came into the public eye back in 1999. 22 years later, and after several changes along the way, the biggest change is now due to happen – which will affect the majority of contractors, as well as their recruiters and end clients.

We therefore thought it would be useful to remind you of what has happened so far, and what exactly is changing once the reforms will come in to place on the 6th April.

A history of IR35

1999

The term IR35 was first coined way back in 1999. The Chancellor of the Exchequer at the time, Gordon Brown, announced the plans as part of the year’s budget. This was first announced as a means to crack down on disguised employees – those who avoided tax by working through a limited company, when in fact their working practices were more in line with a traditional company employee.

2000

Officially known as Intermediaries Legislation, the new regulation that came to be known as IR35 became law in April 2000 as part of the Finance Act.

2010

Following the coalition government in 2010 formed by David Cameron and Nick Clegg, George Osbourne became the Chancellor of the Exchequer. Osbourne announced the creation of the Office of Tax Simplification (OTS), with one of its main objectives was to review and improve IR35.

2011

Following some deliberation and three different ideas presented to the Government, it was decided IR35 was too important to be scrapped, and instead called for it to be updated. The changes made included creating a dedicated IR35 helpline, publishing clear guidance and scenarios to help individuals determine their status and creating an IR35 Forum to monitor the improvements made.

IR35 changes to the public sector

2015

IR35 was once again raised by the Government in the 2015 Summer Budget, with the Government at the time releasing a document entitled ‘How to make IR35 more effective in protecting the Exchequer’.

HMRC believed that the current IR35 legislation was ineffective, with the Government estimating that non-compliance may cost £430 million a year.

2016

Following this investigation in 2015, on the 16th March 2016 (Budget Day), the Government announced a clampdown on off-payroll working within the public sector.

Fast forward to December 2016, and the details of the IR35 reforms are published. It is announced that from 6th April 2017, public sector clients would have the responsibility for determining whether a contractor is working inside or outside IR35.

If the contractor was deemed inside IR35, the client would be responsible for collecting PAYE and NI at source.

2017

The public sector reforms went live on the 6th April as planned. To help contractors, recruiters, and end clients determine an IR35 status, a new IR35 employment status tool (ESS) was launched. This tool would later be developed into the Government’s CEST tool, which is still used today.

IR35 changes to the private sector

2018

In October 2018, the Chancellor announced that the off-payroll reforms would be extended to the private sector, with effect from 6th April 2020.

2020

With just a few weeks to go until the reforms were due to be made live for the private sector, in March 2020 Rishi Sunak announced that the IR35 reforms would be delayed by a year. This decision was made in response to the coronavirus pandemic.

When will the IR35 reforms take place?

2021

Sunak was very clear that the IR35 reform delay was a delay as opposed to a cancellation, and currently there is nothing to suggest that the reforms will be delayed again, and as it stands they will come in to effect on the 6th April 2021. Ultimately, we don’t believe that the reforms will be delayed again, you can read why here.

How can Kingsbridge help?

With the reform deadline coming ever closer, it’s incredibly important that as a contractor, you are able to show your IR35 status is outside if it is. Getting an inside IR35 status determination will result in you paying the same tax and national insurance contributions as if you were an employee of the company, resulting in a possibly significant loss of income.

We’ve already seen some contractors placed inside IR35 by means of blanket determinations, a less than ideal outcome for them.

Our award-winning IR35 Status Tool offers a status review for just £50 plus VAT. Once the questionnaire is completed, an instant result is given. In the case of an indeterminate result, this is passed to our IR35 expert team for them to assist with a manual review (at no extra cost).

We’re currently the only IR35 solution provider to offer this hybrid tool so to take advantage of it, or to suggest it to your client, visit our site today.

Related topics

Contractors IR35

You might also like...

Back to resources
Close up photo of female worker at a desk with laptop and calculator, representing article on what insurance contractors need
Contractor Guides Contractors 03 Nov 2026

What insurance contractors need?

We know it can be a minefield for contractors when it comes to purchasing the right contractor insurance to protect…

Image of a handheld drill on a work bench, representing guide on how to insure work tools for tradespeople
Trades Trades Life 09 Sep 2026

How to insure your tools: a tradesperson’s guide

Most tradespeople spend a lot of time thinking about the next job, the next customer, or the next challenge on…

A flat lay of a desk with stationery and notebook with writing 'insurance checklist', representing guide on questions to ask when buying contractor insurance
Contractor Guides Contractors 24 Aug 2026

7 things to ask before buying contractor insurance

Buying contractor insurance isn’t exactly the most exciting item on your to-do list.  When you’re focused on winning contracts, meeting…

Image of tradesman leaning against white van looking at insurance quotes on his phone, representing article discussing cheap tradesmen insurance
Trades Trades Life 28 Jul 2026

Cheap trades insurance: how low is too low?

When you’re running your own trades business, it’s only natural to try and keep costs to a minimum. But for…

Photo of protest crowd in london, representing article on loan charge review scandal
Contractors News 15 Jul 2026

Why the Loan Charge scandal isn’t going away

In the late 1990s, loan-based remuneration schemes began to emerge before becoming widespread among contractors and freelancers during the 2000s.…

Image of tradesman's arm being bandaged, representing article on employers' liability insurance for tradespeople
Trades Trades Life 07 Jul 2026

Do tradesmen need employers’ liability insurance?

If you’re a tradesman running your own business, you might assume employers’ liability insurance only applies to corporate companies. But…

Contractors News 19 Jun 2026

The tax, pension and savings changes UK contractors need to keep on top of

The 2026/27 tax year might not be bringing one dramatic overhaul, but it marks the beginning of a multi-year shift…

Photo of dug out earth with construction worker on mini excavator, representing article on plant and machinery insurance
Trades Trades Life 01 Jun 2026

What is plant and machinery insurance?

From diggers and dumpers to cement mixers and compressors, plant and machinery are the backbone of many trades. Whether you’re…

Close-up of dates on a green calendar, representing article discussing claims made vs claims occurring in business insurance
Contractor Guides Contractors 26 May 2026

Simplifying insurance: what is claims made vs claims occurring

When you’re choosing insurance, you’ll often come across two terms: claims made and claims occurring. They both refer to the…

Tradesmen tools laid out on table, representing article on tool theft stories and keeping tools safe
Trades Trades Life 20 May 2026

Tool theft stories: tradespeople going beyond locks to keep tools safe

As tool theft continues to dominate headlines and social feeds, many tradespeople are no longer relying on standard security –…

Goodie bag from Powered Now Advice on Tap event, representing article on tradespeoples' concerns about tool insurance claims
Trades Trades Life 15 May 2026

Powered Now ‘Advice on Tap’: trade talk and tool theft troubles

Powered Now’s landmark event brings together tradespeople of all backgrounds. But conversations highlight the ongoing issue of tool theft, the…

Photo of builders discussing construction plans, representing article on what professional indemnity means for tradespeople
Trades Trades Life 28 Apr 2026

What is professional indemnity for tradespeople?

Many tradesmen assume professional indemnity is only for people with a desk job. But in reality, if your work involves…

Image of two builders carrying construction materials, representing article on do subcontrctors need their own insurance
Trades Trades Life 15 Apr 2026

Do subcontractors need their own insurance?

Knowing whether subcontractors need their own insurance can be confusing. Whether working in construction, roofing, plumbing, electrical work or specialist…

Image of construction hard hats representing a guide to what insurance a tradesman needs
Trades Trades Life 31 Mar 2026

What insurance does a tradesman need?

Insurance sounds like a good idea, but how do you know what insurance you need as a tradesman? No two…

Photo of a presentation screen at an event held by Kingsbridge on the JSL legislation and what it means for recruitment agencies
Partner News Partners 30 Mar 2026

What JSL will mean for you: Five lessons from our expert panel

Earlier this month Kingsbridge brought together a panel of industry experts to discuss the implications of the government’s new JSL…

Builder working on a house extension roof, representing a guide to contract works insurance for tradespeople including what it covers
Trades Trades Life 17 Mar 2026

What is contract works insurance?

However big or small your construction project is, contract works insurance could be a lifesaver if something happens. When you’re…

Image of bricklaying representing article on who needs trades insurance and what it covers
Trades Trades Life 10 Mar 2026

Who needs trades insurance?

If you work in the trades, chances are you’ve already heard people chatting about tradesman insurance, but have been left…

Calendar with date circled, representing guide on what a retroactive date is in professional indemnity insurance
Contractor Guides Contractors 26 Feb 2026

Professional indemnity insurance: what’s a retroactive date

Whether you’ve just taken out a professional indemnity policy or you’re shopping for new business insurance, chances are you’ve come…

HMRC Making Tax Digital campaign asset, representing article disucssing the upcoming changes for sole traders April 2026
Contractor Guides Contractors 16 Feb 2026

A ‘Making Tax Digital’ wake-up call for sole traders

The way Britain pays tax is entering its biggest modernisation in a generation, with Making Tax Digital (MTD) for Income…

Photo of HMRC London offices representing article discussing the Employment Rights Act 2025 being law, what changes it brings and what businesses need to do now
Partner News Partners 22 Jan 2026

Employment Rights Act 2025 ‘brings world of work into 21st century’

Big changes to the world of work have been on the horizon for a while and the Royal Assent of…

HMRC Self Assessment tax return letter for 2025 tax year sent to UK taxpayer with UTR and NINO
Contractor Guides Contractors 16 Jan 2026

Online Self Assessment tax return deadline: what to know for 2026 (and beyond)

If you’re required to file a Self Assessment tax return for the 2024/25 tax year, the deadline to submit it…

Contractor Guides Contractors 01 Jan 2026

What is the difference between a sole trader and a limited company?

One of the big questions for any contractor when they first set up as self-employed is whether you should operate as a…

Image of sparks caused by power tools, representing article on what makes a trade high risk for insurance
Trades Trades Life 18 Dec 2025

Trades cover: who’s considered high risk for insurance

If you’re in the trades, you already know the job isn’t without its risks. But did you know those risks…