IR35 Survival Checklist for UK Freelancers

IR35 (off-payroll working rules) is where freelancing meets employment law theatre. Get the status wrong and you can face unexpected tax treatment. Get the paperwork sloppy and you argue from weakness later.

This page is a practical checklist for people selling services through a personal service company or similar arrangements in the UK. It is not legal or tax advice. Status is fact-specific. When money or risk is material, use a qualified adviser and primary HMRC guidance.

What IR35 is trying to answer

In plain English: If you ignored the limited company, would this engagement look like employment?

If yes (“inside IR35”), tax treatment can resemble employment for that engagement. If no (“outside IR35”), it can be treated more like a genuine business-to-business supply—when the facts support that.

Rules and who determines status (client vs worker) have evolved by sector and client type. Always check current GOV.UK / HMRC guidance for your client type (public sector, medium/large private, small client, etc.).

Survival principle

Substance over logos. A contract that says “independent consultant” means little if you:

Have a manager who controls your hours and method
Cannot send a substitute
Are embedded like staff
Have no real financial risk
Only work for one “client” who looks like an employer

HMRC and tribunals care about reality.

Pre-bid checklist (before you fall in love with the rate)

1. Who is the client, really?

End client name and sector
Agency chain length (more layers ≠ more protection)
Whether they have a reputation for blanket inside/outside policies

2. What are you supplying?

A deliverable or outcome you control, or a body on a chair?
Can you describe success without referring to “being available 9–5”?

3. Control

Ask (and document answers):

Who decides how the work is done?
Who decides when and where (beyond genuine site constraints)?
Can the client move you between tasks like an employee?

4. Substitution

Is an unfettered right to send a substitute realistic—or theatrical?
Have you ever actually substituted? (Evidence beats clauses.)

5. Mutuality of obligation

Are they obliged to offer ongoing work?
Are you obliged to accept it?
Or is each statement of work discrete?

6. Financial risk

Do you invoice for results, with snagging at your cost?
Do you provide your own equipment and insurance?
Can you make a loss on the engagement?

7. Part and parcel

Staff discounts, org chart, line manager, appraisals?
Email signature that looks internal?
Excluded from contractor areas… or sitting in the team for years?

Contract hygiene (still not a magic shield)

Useful clauses often include:

Clear services description and deliverables
Right of substitution (if real)
No obligation on either side for further work beyond SOWs
Your control over method
Your insurance and equipment responsibilities
IP and confidentiality that still look B2B

Dangerous patterns:

“Work as directed by the client’s managers” with no delivery frame
Exclusive full-time availability for a single client indefinitely
Termination terms that mirror employment without project logic

Have contracts reviewed when the day rate is high or the client is risk-averse.

Status determination and paperwork

Depending on client type, you may receive a Status Determination Statement (SDS) or equivalent process. Practical habits:

Keep the SDS and your challenge correspondence
Keep SOWs, deliverables, and change requests
Keep evidence of how you actually worked (not just how you hoped to)
Revisit status when the role morphs (the classic “two-week project” that becomes eighteen months embedded)

CEST and tools

HMRC’s Check Employment Status for Tax (CEST) tool is widely used. Treat outputs as inputs to judgement, not holy writ—especially if your answers were optimistic. Save outputs with date stamps.

Insurance and commercial protection

Discuss with a broker where relevant:

Professional indemnity
Public liability
Tax investigation insurance (understand exclusions—IR35 disputes are not always covered the way brochures imply)

Rate vs risk

Inside IR35 engagements sometimes pay more on paper because the tax position changes. Compare net outcomes with an accountant, including:

Employer-side costs that clients bake into budgets
Umbrella options vs PSC
Your appetite for enquiry risk

A slightly lower outside rate with clean facts can beat a higher inside rate that destroys optionality—or the reverse. Run numbers; do not moralise.

Red flags that deserve a walk-away

Client refuses any written status position on a medium/large engagement where process should exist
Role is described as “covering maternity for a permanent headcount” with staff-like control
You are pressured to pretend outside status while working as staff
Agency says “everyone signs this” and will not answer control/substitution questions

Primary sources to open (not substitutes for advice)

GOV.UK / HMRC guidance on off-payroll working (IR35)
HMRC CEST tool and accompanying manuals
Your engagement contract + SDS (where issued)

Disclaimer

IR35 and employment status are complex and fact-specific. This page is general educational information published by Tabaconda LLC. It is not legal, tax, or regulated advice. Do not make status decisions solely from a blog checklist.

🐺 Back to Jackals

IR35 Survival Checklist for UK Freelancers