1. Key UK Contractor Changes for the 2026/27 Tax Year
Working as a contractor in the United Kingdom via a Personal Service Company (PSC) or Umbrella Company requires navigating specific off-payroll working rules (IR35) and frozen personal allowances.
New Small Company IR35 Threshold (£15M)
A major regulatory update took effect raising the qualification criteria for “small” private sector clients:
- Annual Turnover: Increased from £10.2M to £15 Million
- Balance Sheet Total: Raised from £5.1M to £7.5 Million
- Headcount: Remains at 50 employees
If your end client qualifies as a small business under these thresholds, the responsibility for assessing your IR35 status reverts back to you (the contractor), rather than the client issuing a Status Determination Statement (SDS).
Income Tax & Personal Allowance Freeze
The standard tax-free Personal Allowance remains frozen at £12,570. The Basic Rate (20%) applies up to £50,270, the Higher Rate (40%) up to £125,140, and the Additional Rate (45%) on earnings above £125,140. Tapering reduces the allowance by £1 for every £2 of income above £100,000.
2. Inside IR35 vs Outside IR35 Comparison
Outside IR35: You operate as a genuine business entity. You can draw a tax-efficient mix of a modest director’s salary (up to the Primary Threshold) and dividends, yielding substantially higher net take-home pay.
Inside IR35: HMRC treats the engagement as deemed employment for tax purposes. PAYE tax and Employee & Employer National Insurance are deducted at source (often via an Umbrella company), reducing net retention to approximately 55%–65% of gross billings.