Comparison · 2025/26
Contractor Inside vs Outside IR35: Ltd Company Dividends vs Deemed Employment Compared for 2025/26
IR35 — the UK's Intermediaries Legislation in force since April 2000 — is the single most important tax determination for the country's ~700,000 contractors operating through Personal Service Companies (PSCs). A contract determined "Outside IR35" means the contractor pays corporation tax at 19-26.5% on company profits then extracts via low salary + dividends, with marginal dividend tax rates of 8.75%/33.75%/39.35%. A contract determined "Inside IR35" means the day rate is treated as deemed employment income subject to full PAYE (20%/40%/45%) and employees NI (8%/2%), with limited business expenses allowed. The net difference at typical day rates (£400-£700) is £15,000- £25,000/year — a material driver of contractor cash flow. Since the Off-Payroll Working reforms of April 2021 (private sector medium/large) and April 2017 (public sector), the engager determines status via Status Determination Statements (SDS), not the contractor. The April 2024 offset modestly improved engager exposure, allowing some recovery of Outside-IR35 contracting roles. This comparison covers the three case-law tests (control, substitution, mutuality of obligation), HMRC's CEST tool and its limitations, the OPW liability structure, the small-engager exemption, the umbrella alternative, and a worked £500/day example showing the full take-home picture in 2025/26.
At a Glance
| Feature | Outside IR35 (Ltd) | Inside IR35 (Deemed) |
|---|---|---|
| Tax structure | Corp tax + dividend tax | Full PAYE + NI |
| Director salary | £9,100-£12,570 (tax-optimal) | N/A — full day rate as PAYE |
| Corporation tax | 19% small / 26.5% marginal / 25% main | N/A (no corp tax) |
| Dividend tax | 8.75% / 33.75% / 39.35% | N/A |
| Income tax | On salary only | On full day rate |
| Employees NI | On salary only (usually nil) | Full 8%/2% on day rate |
| Employers NI | Avoided if salary < £5k threshold | 15% — usually deducted from day rate |
| Expenses | Full business expenses deductible | Mileage, subsistence, training only |
| Pension via salary sacrifice | Yes (employer contribution, corp-tax deductible) | Limited (umbrella permitting) |
| Determination by | Contractor (small engagers) | Engager (med/large) |
| Typical net on £500/day | ~£72-£80k | ~£60-£65k |
The Three Status Tests
IR35 status is determined by reference to three primary case-law tests, derived from Ready Mixed Concrete v MoP (1968) and developed through subsequent jurisprudence including Atholl House (2022) and Kickabout Productions (2020):
- CONTROL — who decides what work is done, when, where and how? An employee is told; a contractor decides. Strong indicators of employee status: fixed office hours, fixed location, line manager direction, regular performance reviews, integration into team structure. Strong contractor indicators: flexible hours, off-site working permitted, scope-driven work, project completion criteria, autonomy on methods.
- SUBSTITUTION — can you send a substitute to do the work? A genuine contractor can substitute (subject to client approval of skills equivalence). An employee personally must do the work. A substitution clause must be REAL and exercisable in practice, not just contractual paper. If the engager would never accept a substitute, the clause is a "sham" and fails.
- MUTUALITY OF OBLIGATION (MOO) — is the engager obliged to offer ongoing work, and you obliged to accept it? Employees have ongoing mutual obligation; contractors have a defined piece of work with no obligation beyond it. Indicators of MOO: ongoing engagement renewals, expectation of continued work, lack of clear project end-date, integration into long-term staff planning.
All three tests are considered together — no single test is decisive, though substitution and MOO are particularly weighted post-Atholl-House. Additional secondary factors weighed by tribunals: financial risk borne by the contractor; provision of own equipment; integration into the organisation (the "part and parcel" test); intent of the parties; presence on staff directories; access to staff benefits like company events. Contracts and SDS documentation are relevant but secondary — actual working practices override contract wording in tribunal disputes.
The CEST Tool and Its Limitations
CEST (Check Employment Status for Tax) is HMRC's online questionnaire tool at gov.uk/guidance/check-employment-status-for-tax. It covers control, substitution, MOO and additional factors over 20-30 questions, producing an indicative status determination. HMRC has stated they will accept CEST results if the answers accurately reflect working practices.
Limitations: approximately 20% of cases return "undetermined" results — useless for engagers needing a clear SDS. The tool has been criticised for downplaying substitution in practice (treating it as a tie-breaker rather than dispositive), and for ignoring recent case-law developments in Atholl House and Kickabout Productions. Multiple CEST results have been overturned at First-tier Tribunal. HMRC continues to update CEST but the criticisms persist.
Practical recommendation: use CEST as one input, but for material engagements (over £50k annual contract value) commission a specialist IR35 review from firms like Qdos, Bauer & Cottrell or Markel Tax. Their reviews cost £300-£800 and produce a defensible position. Many contractors take out IR35 insurance (typically £100-£300/year) that funds defence costs if HMRC challenges; this is essential at Outside-IR35 contracts where the risk sits with the contractor (under small-engager exemption) or where engager-determination cases get re-litigated.
The Off-Payroll Working Reforms
Before April 2017 (public sector) and April 2021 (private sector medium/large), IR35 determination was made by the contractor (PSC) and the contractor was liable for any error. The Off-Payroll Working (OPW) reforms shifted this: the END CLIENT engager became responsible for determining status and issuing a Status Determination Statement (SDS) to the contractor and any intermediary agency.
The "deemed employer" (usually the agency, sometimes the end client directly) became liable for unpaid PAYE/NI if the determination was wrong. This created massive risk for engagers, who responded with three patterns: (1) "blanket Inside" determinations refusing PSC engagement entirely — notable in banking, financial services, large pharma and several government departments; (2) "umbrella-only" routes forcing contractors into umbrella employment for any engagement; (3) genuine case-by-case status reviews with proper documentation.
The OPW reforms produced significant migration from PSC-Outside to PSC-Inside or umbrella, with materially lower net pay for affected contractors. Many specialist contractors (IT, engineering, finance) shifted to umbrella or employment, reducing the contractor pool by an estimated 15-20% in scope sectors. The April 2024 offset (see below) modestly reversed this trend.
The April 2024 Offset
The 2024 IR35 offset (Finance Bill 2024, in force from 6 April 2024) addressed a double-taxation problem in IR35 disputes. Previously, if HMRC re-categorised a contract from Outside to Inside, the engager became liable for full PAYE/NI on the historic day rate — even though the contractor had already paid corp tax + dividend tax on the same income through the PSC.
The offset allows engager liability to be reduced by the tax already paid by the contractor through the PSC. In practice this materially reduces engager exposure on historic re-categorisation cases. Result: engagers more willing to enter Outside-IR35 determinations (less downside if HMRC challenges), and a modest recovery of Outside contracting roles since mid-2024.
The offset does NOT change the determination process or the status-test logic. The engager still issues the SDS and bears initial liability; the offset simply caps that liability at the genuine economic loss to HMRC. Contractors should not rely on the offset alone — engagers still have process risk and many remain risk-averse, especially in regulated sectors.
Small Engager Exemption
"Small" private-sector engagers are exempt from the OPW reforms. For small engagers, the contractor retains responsibility for IR35 determination — same as the pre-2021 regime. Small is defined per Companies Act 2006 thresholds (raised April 2025):
- Annual turnover below £15m (was £10.2m pre-2025)
- Balance sheet total below £7.5m (was £5.1m pre-2025)
- Employees fewer than 50
Meeting at least two of these criteria qualifies the engager as small. Many smaller consulting clients, startups and SMEs fall in scope of this exemption. The April 2025 raising of thresholds expanded the exempt pool meaningfully. For contracts with small engagers, contractors determine status themselves — and can genuinely be Outside if working practices support it. The risk sits with the contractor; IR35 insurance and specialist review are particularly valuable for small-engager Outside contracts.
Worked £500/Day Example
Contract: £500/day, 220 working days/year = £110,000 gross revenue. 2025/26 tax rates applied throughout.
Outside IR35 (Ltd Company):
- Director salary £12,570 (uses full personal allowance, £0 income tax, £0 employees NI under threshold)
- Remaining profit: £110,000 - £12,570 = £97,430
- Corporation tax: 19% on first £50,000 = £9,500; marginal 26.5% on £47,430 = £12,569. Total corp tax ~£22,069.
- Distributable profit after corp tax: £75,361
- Director takes £37,500 of dividends in basic-rate band (after £500 dividend allowance), taxed at 8.75% = £3,238
- Higher-rate dividends £37,861 taxed at 33.75% = £12,778
- Net to director: £12,570 + £37,500 + £37,861 - £3,238 - £12,778 = ~£71,915
- Plus retained profit £nil for further drawing or pension contributions (in practice contractors often retain some profit for pension and lumpy drawing).
Inside IR35 (Deemed Employment):
- £110,000 treated as employment income (assume agency passes through gross of employer NI)
- Personal allowance £12,570
- Basic-rate band £37,700 at 20% = £7,540
- Higher-rate band £59,730 at 40% = £23,892
- Employees NI: 8% on £37,700 = £3,016 (basic-rate band) + 2% on £59,730 = £1,195 (higher) = £4,211 total
- Total deductions: £35,643
- Net to contractor: £110,000 - £35,643 = ~£74,357
- However: in practice, the agency typically deducts employers NI (15%) and apprenticeship levy (0.5%) from the headline day rate BEFORE passing to PAYE — so the £500/day "headline" may translate to ~£430/day "in PAYE" = ~£94,600 effective gross → net ~£64,000.
Practical difference between Outside (~£72k net) and Inside (~£64k net) at £500/day: approximately £8,000-£18,000/year, depending on how the agency absorbs employer NI. The Outside advantage grows substantially at higher day rates (£700+) and where pension contributions are involved — Outside employer pension contributions (paid by the Ltd company) are corp-tax deductible at the marginal rate (26.5%) and avoid all personal tax until drawing, providing a very efficient tax shelter unavailable in equivalent form Inside IR35 or umbrella.
The Umbrella Alternative
An umbrella company is a third-party PAYE employer that employs the contractor and supplies their services to the end client via agency. Economically equivalent to Inside IR35 for tax purposes — full PAYE on day rate, employees NI, employers NI passed through, no business expenses beyond mileage/ subsistence. The umbrella provides statutory employment rights (holiday pay accrual, sick pay, pension auto-enrolment).
Advantages of umbrella over Ltd-Inside IR35: no Ltd company admin burden (no accounts, no corporation tax filing, no dividend planning); employer pension scheme available; statutory holiday pay accrual; simpler for short assignments. Drawbacks: ALL employers NI is effectively passed through to the contractor via reduced headline rate; no expense relief beyond basic mileage and subsistence; weekly margin deducted (£15-£30/week typical); some umbrellas have poor reputation for transparency (the FCSA accreditation flags higher- quality umbrellas).
Umbrella is overwhelmingly used by contractors forced Inside IR35 by engager blanket determinations, or working short-term assignments below the threshold where Ltd company is worthwhile (typically under 6 months or under £30k of contract value). For longer-term Outside-IR35 contracts, Ltd company remains substantially more tax-efficient. From April 2026, umbrella companies become subject to specific FCA / HMRC regulation under the Umbrella Company Regulation Act (in force April 2026) — expect more transparency and probably higher umbrella margins as compliance costs rise.
Which to Choose
The choice is largely NOT yours — it depends on the engager's status determination. For medium/large private engagers and public sector, the SDS issued by the engager binds the contractor. The contractor's control over "choice" reduces to: (1) accepting or declining the contract based on the SDS; (2) for small-engager exempt cases, determining status themselves and bearing the risk; (3) negotiating the contractual working practices to support an Outside determination where genuinely justified.
Strategic positioning advice for contractors: (a) negotiate substitution clauses that are real and exercisable; (b) avoid integration markers (no fixed office, no team-meeting attendance, no performance reviews); (c) be project- scope focused rather than ongoing-services; (d) maintain multiple concurrent clients where possible; (e) own your equipment and incur financial risk; (f) commission a specialist IR35 review at contract signing for material engagements; (g) carry IR35 insurance for Outside contracts; (h) for forced- Inside contracts, accept umbrella or PSC-Inside and adjust day rate negotiation to compensate for net-pay differential.