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Internal Auditor Contract Rates in Cardiff: Day Rate Quartiles and Demand
Live market telemetry, compensation quartiles, and IR35 compliance benchmarks across the UK contract sector.
Median Daily Rate
£232/day
in line with national baselines
Interquartile Range
£158/day – £350/day
Middle 50% market distribution
Contract Engagement Split
18% Outside IR35
9% Inside IR35 engagements
Market Conditions and Compensation Trajectory
Off-payroll determination outcomes for Internal Auditor assignments in Cardiff maintain clear operational transparency, giving independent practitioners confidence in their contracting arrangements. Compliance tracking across active local postings confirms that 18% of active roles are determined outside the scope of IR35. Supported by sound contractual governance, local rate intelligence confirms a median of £232/day, tracking 0.0% against prevailing national contracting benchmarks. Quartiles span £158/day to £350/day against a regional rate discount versus London. Figures summarise advertised pay on this hub to November 2026 and are market statistics, not a personal offer or guaranteed assignment rate.
Daily Rate Quartiles and Market Benchmarks
Day rates come from the Quality Contracts market benchmark dataset of UK contract postings; IR35 outcomes and sector labels come from vacancies matching this hub. Quartiles use priced roles only.
| Metric | Value | What it shows |
|---|---|---|
| Median day rate | £232/day | Mid-market advertised pay for this hub |
| 25th percentile (P25) | £158/day | Lower-quartile priced vacancies |
| 75th percentile (P75) | £350/day | Upper-quartile priced vacancies |
| Outside IR35 share | 18% | Stated limited-company / outside SDS |
| Inside IR35 share | 9% | Stated PAYE / umbrella / inside SDS |
| Undetermined IR35 | 73% | Adverts that omit a published status |
| Leading sector | Finance & Strategy (82%) | Largest hiring cluster in the sample |
| Priced sample | 1,331 roles | Postings with a stated day rate in the benchmark dataset |
| Regional rate band | a regional rate discount versus London | Location pricing context, not an SDS |
Statutory Standards and Frequently Asked Questions
Cardiff does not create a special IR35 code for Internal Auditor work. The client SDS should name the Cardiff workplace and delivery model. An inside finding on a Cardiff Internal Auditor brief typically deducts tax at source, while outside IR35 Internal Auditor work in Cardiff is billed by a PSC. Local pay sits on a regional rate discount versus London, so a higher Cardiff headline rate can still be inside. Commuting into Cardiff does not, by itself, prove substitution or lack of control. Read the Internal Auditor Cardiff contract for workplace, hours, and equipment clauses.
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