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100% REMOTE JOB: Senior Mainframe Security Analyst (RACF) - Must have - (Audit A...
Posted Today by Prohires
100% REMOTE JOB: Senior Mainframe Security Analyst (RACF) - Must have - (Audit Assessment expertise).Work Location: 100%...
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Mainframe Developer Outside IR35 Contracts: Compliance and Take-Home Pay
Live market telemetry, compensation quartiles, and IR35 compliance benchmarks across the UK contract sector.
Median Daily Rate
£425/day
in line with national baselines
Interquartile Range
£300/day – £500/day
Middle 50% market distribution
Contract Engagement Split
100% Outside IR35
0% Inside IR35 engagements
Market Conditions and Compensation Trajectory
This board filters Mainframe Developer contract hiring in the UK by published off-payroll status, rather than an unfiltered vacancies hub. Median advertised pay on this determination slice is £425/day, with quartiles from £300/day to £500/day from 3 priced, status-filtered roles to November 2026. Within the filtered sample, 100% outside IR35 and 0% inside IR35. Hiring on this statutory slice is led by IT at 87%. Local pricing sits on UK-wide rate parity and does not decide IR35 by itself. Compare substitution, control, and mutuality in the contracts above before you model net pay.
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 | £425/day | Mid-market advertised pay for this hub |
| 25th percentile (P25) | £300/day | Lower-quartile priced vacancies |
| 75th percentile (P75) | £500/day | Upper-quartile priced vacancies |
| Outside IR35 share | 100% | Stated limited-company / outside SDS |
| Inside IR35 share | 0% | Stated PAYE / umbrella / inside SDS |
| Undetermined IR35 | 0% | Adverts that omit a published status |
| Leading sector | IT (87%) | Largest hiring cluster in the sample |
| Priced sample | 3 roles | Vacancies used for the rate corridor |
| Regional rate band | UK-wide rate parity | 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 Mainframe Developer assignment in the UK. 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 the UK. If the SDS is missing or disputed, use the client’s disagreement process before you start.
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