IR35 reviewed before you sign — not after HMRC asks.
Status determination, contract review, and working practice analysis for UK contractors operating through a PSC.
IR35 enquiries can backdate up to 6 years. The wrong determination on a single contract can cost £20,000–£100,000+ in tax and NIC. We review every contract before you sign — and document the assessment so it stands up under enquiry.
Is this for you?
- Contractors operating through a personal service company (PSC)
- Contractors about to sign a new contract
- Contractors whose end-client has issued a Status Determination Statement (SDS)
- Contractors who have received an HMRC IR35 enquiry letter
- Directors switching from umbrella to PSC
What's included.
Contract review
Every contract reviewed for IR35 indicators before signing.
Working practices analysis
Substitution rights, control, mutuality of obligation — assessed against your actual day-to-day work.
Status determination
Inside or outside IR35 — documented in writing with reasoning.
Tax-impact modelling
If inside, we model the financial impact and recommend the structure (PSC, umbrella, employed).
End-client SDS challenges
If the end-client has issued an inside SDS you disagree with, we prepare the dispute.
Enquiry defence
If HMRC opens an IR35 enquiry, we defend the historic position with the documented evidence.
The system that turns this service into a year-round process.
Evidence Pack captures the contract, the SDS (if any), and the working-practices documentation contemporaneously — not reconstructed years later under HMRC pressure. Deadline Lock tracks IR35-relevant dates (HMRC enquiry windows, contract renewal dates).
Read more about Compliance Vault™Documented in your engagement letter. Reviewed annually.
- WhatsApp typically under 30 min
- Email within 1 working day
- Monthly close by the 7th
- Phone manned reception, typically within 10 min
Three steps. No back-and-forth.
Step 01: 20-minute discovery call
We confirm fit and walk through how this service would work for your business.
Step 02: Engagement and onboarding
Engagement letter, Direct Debit, and Compliance Vault™ setup — typically within 24 hours.
Step 03: Year-round delivery
Monthly numbers, tracked deadlines, advisory raised — and an Annual Compliance Review every 12 months.
Bundled with contractor monthly compliance from £150/month. Standalone reviews from £400.
A specific fee is agreed in writing after your 20-minute discovery call. No hourly billing. No surprise charges. No add-on tiers.
What you get from us that you don't get elsewhere.
Reviewed before you sign
Not after the contract is live or after HMRC enquires. Before the signature.
Documented in writing
Every determination is written down. If HMRC asks, the evidence is contemporaneous.
Working practices, not just contract
HMRC looks at what actually happens day-to-day. So do we.
Tax-impact modelling
If inside, we tell you the real financial impact and recommend the right structure.
IR35 reviewed before you sign — not after HMRC asks — common questions.
What is IR35?
IR35 (the off-payroll working rules) is UK tax legislation that determines whether a contractor working through a personal service company is genuinely self-employed or is effectively a 'disguised employee'. If 'inside IR35', the contractor pays tax and NIC as if employed.
Who decides my IR35 status?
For public-sector and medium/large private-sector clients, the end-client decides via a Status Determination Statement (SDS). For small private-sector clients, the contractor (you) determines status. Either way, the working practices must support the determination — a paper-only assessment isn't enough.
What does 'inside IR35' actually cost me?
Inside IR35 typically increases your tax burden by 25–35% of net contract value compared to outside IR35. On a £100k contract, that's £25,000–£35,000+ in additional tax and NIC. Backdated retrospective determinations can also trigger 6 years of historic tax plus interest and penalties.
Can I challenge an inside SDS from my end-client?
Yes. End-clients are required to consider challenges under the off-payroll rules. We prepare the dispute with reference to the contract, working practices, and HMRC's CEST tool results. End-clients change SDS determinations in roughly 25–40% of well-prepared challenges.
What if HMRC opens an IR35 enquiry on a past contract?
Get in touch immediately — this is a Signal #1 situation. We respond to HMRC, gather contemporaneous evidence from Compliance Vault™, and defend the status determination. Without good evidence, HMRC can apply 'best judgment' retrospectively, which usually means a larger bill.
Often handled together.
Book a 20-minute call.
We'll confirm whether we're a fit, and if we are, we'll tell you exactly what ir35 assessment would look like for your business.