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sub-contractor agreement review checklist uk

Sub-Contractor Agreement Review Checklist: What to Check Before You Sign

If you're working through a sub-contractor agreement review checklist UK businesses actually need, this page is built for you. Sub-contractor agreements sit at the intersection of employment law, IP ownership, payment terms, and liability — and a poorly reviewed one can cost you significantly. Whether you're a main contractor bringing in a sub-contractor, or a freelancer being asked to sign one, the risks are real: unclear scope, missing IR35 protections, no IP assignment clause, or liability terms that leave you exposed. UK contract law doesn't automatically protect you just because something feels fair. What's written governs what happens in a dispute. This checklist walks you through the clauses that matter most, the red flags that should make you pause, and the points where you genuinely need a solicitor rather than a template. Atornee can help you audit the document quickly before you decide whether to escalate.

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Why this matters

Most sub-contractor agreements get signed too fast. Someone sends over a PDF, there's time pressure, and the relationship feels solid — so you skim it. Then a payment dispute hits, or the client claims ownership of work you thought was yours, or you're suddenly liable for something you never agreed to verbally. The real problem isn't that sub-contractor agreements are complicated — it's that the clauses that matter most are buried in boilerplate. UK founders and freelancers need a fast, reliable way to know what they're actually agreeing to before they sign, without paying solicitor rates for every document review.

The Atornee approach

Atornee isn't a solicitor and doesn't pretend to be. What it does is give you a structured, UK-specific review of your sub-contractor agreement in minutes — flagging the clauses that are missing, the terms that are unusual, and the sections where the risk is high enough to warrant professional advice. You get plain-English explanations of what each clause actually means for your business, not generic legal summaries. For straightforward agreements, that's often enough to sign with confidence. For complex or high-value contracts, Atornee helps you arrive at a solicitor's desk already knowing what questions to ask — which saves time and money.

What you get

A clause-by-clause breakdown of your sub-contractor agreement flagging missing protections, unusual terms, and high-risk language
Clear identification of IR35-relevant clauses and how the agreement's wording could affect employment status determinations
IP ownership and assignment analysis — so you know who actually owns the work product when the contract ends
Payment, invoicing, and late payment clause review against UK norms including the Late Payment of Commercial Debts Act
A plain-English summary of your liability exposure and any indemnity clauses that shift risk onto you unexpectedly

Before you sign checklist

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1. Gather the full agreement including any schedules, appendices, or referenced documents — these form part of the contract
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2. Check the scope of work clause: is it specific enough that disputes about what's included are unlikely?
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3. Review the payment terms: confirm the payment schedule, invoice process, and what happens if payment is late
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4. Identify who owns IP created during the engagement — look for assignment clauses and any carve-outs for pre-existing materials
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5. Check the termination clause: how much notice is required, and are there any conditions that allow immediate termination without payment?
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6. Look for indemnity and liability clauses — note any that are uncapped or that require you to indemnify the other party broadly
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7. Upload the agreement to Atornee for a structured review before deciding whether to sign, negotiate, or escalate to a solicitor

FAQ

What should I look for in a sub-contractor agreement in the UK?

The key areas are: scope of work (is it clear and specific?), payment terms (amount, schedule, late payment provisions), IP ownership (who owns what you create?), termination rights (how and when can either party exit?), liability and indemnity clauses (what are you on the hook for?), and confidentiality obligations. IR35 status is also relevant if you're operating through a limited company — the agreement's wording can affect how HMRC views the engagement.

What are the red flags in a sub-contractor agreement?

Watch out for: uncapped liability clauses, broad indemnities that cover the other party's own negligence, IP assignment clauses that transfer ownership of pre-existing work, vague scope definitions that allow scope creep without additional payment, termination for convenience clauses with no notice period or compensation, and payment terms that are significantly longer than 30 days without justification. Any clause that feels one-sided probably is.

Does a sub-contractor agreement affect IR35 in the UK?

Yes, it can. The wording of a sub-contractor agreement is one of the factors HMRC considers when assessing IR35 status. Clauses around substitution rights, control over how work is done, and mutuality of obligation all matter. A contract that looks like employment on paper — even if labelled as sub-contracting — can trigger IR35 liability. If IR35 is a concern for your engagement, it's worth getting the agreement reviewed with that specifically in mind.

Can I negotiate a sub-contractor agreement in the UK?

Yes. Most sub-contractor agreements are drafted in favour of the party who wrote them. Negotiation is normal and expected, especially on payment terms, liability caps, IP ownership, and termination notice periods. The fact that a document looks formal doesn't mean it's fixed. Knowing which clauses are negotiable — and which the other party is unlikely to move on — is where a structured review helps before you start the conversation.

When should I get a solicitor to review a sub-contractor agreement?

You should escalate to a solicitor when: the contract value is high, the liability clauses are uncapped or unusually broad, there are complex IP arrangements, the agreement involves personal liability, or you're unsure about IR35 implications. For lower-value or straightforward agreements, a structured AI-assisted review can give you enough clarity to proceed or negotiate confidently. Atornee will flag the points where professional advice is genuinely warranted.

Is a sub-contractor agreement legally binding in the UK?

Yes, once signed by both parties, a sub-contractor agreement is a legally binding contract under UK law. Verbal agreements can also be binding, but they're much harder to enforce. If there's a dispute, the written contract is what courts will look at. That's why reviewing it carefully before signing — not after a problem arises — is the only sensible approach.

Related Atornee Guides

Cheap Contract Solicitor Alternative (UK)

Useful if you want to understand your broader options for contract review without full solicitor fees.

Cheap Solicitor for NDA (UK)

Relevant when your sub-contractor agreement also needs to be paired with a standalone NDA for sensitive work.

Atornee Use Cases

See how UK founders and freelancers use Atornee across different contract and document review scenarios.

External References

GOV.UK Business and Self-employed

Official UK guidance on business operations, contracts, and self-employment obligations.

UK Legislation

Primary statutory reference for UK contract law including the Late Payment of Commercial Debts Act and relevant employment legislation.

ICO Guidance for Organisations

Relevant where sub-contractor agreements involve data processing obligations under UK GDPR.

Trust & Verification Policy

Authored By

A

Atornee Editorial Team

UK Contract Research

Reviewed By

C

Compliance Review Desk

UK Business Legal Content QA

Last reviewed on 3/4/2026

"This content is based on analysis of common sub-contractor agreement structures used across UK industries and the clause patterns most frequently flagged in disputes. It reflects practical review experience with agreements across construction, technology, creative services, and professional services sectors."

References & Sources