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Contractor Inside IR35 Contracts: Compliance and Take-Home Pay
Live market telemetry, compensation quartiles, and IR35 compliance benchmarks across the UK contract sector.
Median Daily Rate
£635/day
Interquartile Range
£575/day – £750/day
Contract Engagement Split
0% Outside IR35
Market Conditions and Compensation Trajectory
Off-payroll working rules organise this contractor board for Cardiff. The end client, not the contractor, issues the Status Determination Statement covering this assignment. Inside IR35 means employment-like tax treatment, while an outside SDS keeps limited company invoicing. On this filtered slice, median pay is £635/day with quartiles £575/day to £750/day; 0% of visible roles are outside IR35. Use the filtered list to compare umbrella versus PSC economics. Sector weighting on this page is led by IT at 42% as of November 2026.
Daily Rate Quartiles and Market Benchmarks
Values combine advertised day rates, stated IR35 outcomes, and sector labels from vacancies matching this hub. Quartiles use priced roles only.
| Metric | Value | What it shows |
|---|---|---|
| Median day rate | £635/day | Mid-market advertised pay for this hub |
| 25th percentile (P25) | £575/day | Lower-quartile priced vacancies |
| 75th percentile (P75) | £750/day | Upper-quartile priced vacancies |
| Outside IR35 share | 0% | Stated limited-company / outside SDS |
| Inside IR35 share | 100% | Stated PAYE / umbrella / inside SDS |
| Undetermined IR35 | 0% | Adverts that omit a published status |
| Leading sector | IT (42%) | Largest hiring cluster in the sample |
| Priced sample | 27 roles | Vacancies used for the rate corridor |
| Regional rate band | a regional rate discount versus London | Location pricing context, not an SDS |
Statutory Standards and Frequently Asked Questions
Chapter 10 of ITEPA is the reason this board is filtered. For medium and large private-sector clients, the hirer must issue an SDS covering this contractor assignment in Cardiff. Inside IR35 means employment-like tax treatment: PAYE, employee NI, and usually an umbrella or client payroll. An outside SDS keeps PSC invoicing, with salary and dividend decisions inside the company. Fixed-term PAYE is a different employment wrapper and should not be blurred with outside IR35. A job advert’s IR35 badge is not a substitute for the SDS or for how the assignment actually runs in Cardiff. If the SDS is missing or disputed, use the client’s disagreement process before you start.
What is the contracting market like in Cardiff?
Devolved government makes Cardiff the administrative centre of Wales and a consistent source of programme management, policy, and digital delivery contracts. Insurance and financial services employers, several of whom have established significant operational centres in the city, provide a steady flow of IT, data, and change roles. An emerging technology sector around the city centre and Cardiff Gate business park has added software development and cloud engineering to the local mix, though volumes remain modest compared to larger English cities. The Welsh Government's investment in digital capability is a distinctive feature of the Cardiff market, creating opportunities in govtech and public service transformation that are structured and funded differently from equivalent programmes in England.
What does Inside IR35 mean?
IR35 is UK tax legislation that determines whether a contractor is genuinely self-employed or working in a manner that resembles employment. When a contract is classified as inside IR35, income tax and National Insurance are deducted at source, typically via an umbrella company or agency PAYE. Headline day rates on inside IR35 engagements are generally higher than equivalent outside IR35 roles to account for the tax and employment cost structure.
Inside IR35 determinations are made where the working arrangements are considered to resemble employment, based on factors including the level of client control, the absence of a genuine right of substitution, and the presence of mutuality of obligation. Since April 2021, the end client is responsible for making this determination for medium and large private sector organisations. Many employers in financial services, government, and professional services assess the majority of their contractor engagements as inside IR35.
On QualityContracts.co.uk, approximately 49% of roles with a stated IR35 status are classified as inside IR35, making it the most common arrangement across the contract market. The proportion varies by sector and role type. Each listing on this page displays its IR35 status where provided by the hiring organisation.
How much do contractors usually earn in Cardiff when working Inside IR35?
Contract rates in Cardiff for inside IR35 engagements vary by discipline and seniority. Inside IR35 rates are typically 15% to 30% higher than equivalent outside IR35 roles to account for tax and national insurance deducted at source by the fee-payer. Filter by your specialism above for a more specific range.
How many Inside IR35 vacancies in Cardiff are there on Quality Contracts?
Over the past twelve months, we have tracked over 35,000 contract roles across the site, with roughly one in three sitting Inside IR35. Data reviewed up to October 2026.
