Service agreement if the supplier business controls delivery. Consultancy agreement if the client is buying named expertise and closer personal involvement. If the draft sits between those two positions, start with a review your service agreement pass before you sign the wrong paper.
Use a service agreement when the provider is delivering a service as a business and keeps meaningful control over how that service is delivered. Use a consultancy agreement when the client is engaging a consultant for expertise, usually with more personal involvement, more emphasis on the named individual and more scope for IR35 or status scrutiny.
If the draft is really for an executive director or board appointment, stop and classify that separately. A director's service contract is not the same thing as an ordinary business services agreement. That point matters for governance, member approval and the way the engagement interacts with office-holder status.
If the agreement also carries employment-style obligations, compare it with our employment contract review and employment contract clauses checklist.
The table below gives the practical distinction that usually matters most in UK contract review work. It is not about branding. It is about whether the document fits the real working model.
| Feature | Service Agreement | Consultancy Agreement |
|---|---|---|
| Core relationship | Client and supplier, where the provider is delivering a service as a business. | Client and independent consultant, often centred on a named individual or a PSC. |
| What the client is buying | A managed service, recurring support, outsourced function or defined service outcome. | Specialist advice, interim expertise, project input, analysis or design work. |
| Who usually performs the work | The provider usually chooses its own team, subject to security, clearance or key-person conditions. | The work is more likely to be tied to the consultant personally, with a narrower substitution position. |
| Control risk | Lower if the provider genuinely controls method, staffing, rota and day-to-day delivery. | Higher if the client controls hours, place of work, reporting line or day-to-day method. |
| Tax profile | Often ordinary business-to-business treatment where the arrangement is a genuine managed service. | More likely to trigger IR35 and off-payroll analysis where an intermediary or PSC is used. |
| Clause emphasis | Scope of services, service levels, statement of work, change control, service credits and exit support. | Personal service, substitution, tax responsibility, work-product IP, confidentiality and termination. |
| Strong fit example | A cyber security provider delivering 24-hour monitoring and incident response with its own team and tooling. | An interim security architect working through a PSC on a short project with direct client interaction. |
| Biggest hidden risk | The contract looks like vendor paper, but the reality is labour supply or team augmentation. | The contract says consultant, but the delivery model is really a provider-managed service. |
Most businesses do not get this wrong because the legal concepts are impossible. They get it wrong because the commercial team wants speed, the template is already in the drawer, and nobody checks whether the paper still matches the delivery model.
If the arrangement starts to look like personal labour under close control, compare it with our independent contractor vs employee IR35 guide. If it looks more like supplier paper, compare it with our full contract analysis.
The legal difference is not simply that one form is called a consultancy agreement and the other is not. The real differences appear in status, control, tax exposure, work-product ownership, personal data processing, governance and how the document behaves when the relationship ends.
A consultancy agreement is more likely to raise the question of whether the worker would have been an employee if engaged directly. HMRC's employment-status tools and guidance can help, but the actual facts still matter more than the label.
In a genuine contracted-out or managed service, the identity of the relevant client and the off-payroll analysis can look very different from an intermediary arrangement built around one worker. That is one of the main reasons not to hide labour supply inside generic vendor paper.
If a supposed consultant is really integrated, personally required, closely controlled and not operating with genuine business autonomy, the dispute can move beyond invoices and termination into holiday pay, working time, discrimination and tribunal exposure.
If your question is really about a senior executive, board seat or founder appointment, ordinary supplier services paper can be the wrong starting point. The governance point matters before you negotiate the usual commercial clauses.
A consultancy arrangement often creates bespoke work product closely tied to the individual's expertise. A service arrangement often needs a more nuanced split between vendor tools, reusable methods, manuals, service documentation and the operational materials the client needs to keep using after exit.
If the pack also includes separate confidentiality paper, compare it with our NDA review and NDA clauses guide.
Scotland has its own legal system and the Scottish government publishes its own model services contract. Northern Ireland also publishes its own employment-status guidance. Where the deal is sensitive, governing law and boilerplate are not filler.
Once the classification is right, the drafting still needs to match the operating model. That is where businesses often lose the plot by borrowing the wrong language from a different kind of agreement.
If a consultancy draft promises ongoing support as required with no real limit, it can begin to look less like expert input and more like either vendor support or disguised labour supply.
Do not assume that a consultant tax indemnity cures a badly structured engagement. It does not. If the relationship is wrong in substance, the tax clause is only a back-end allocation tool, not a front-end compliance fix.
If the bundle contains restraint language, compare it with our non-compete clause guide and restrictive covenants guide. If the papers also grant occupation or premises rights, use our tenancy agreement review.
Use this as a decision tool before the draft hardens. If your answers cluster around named person, client control, day rate, PSC and limited substitution, start with consultancy wording and run a serious IR35 and status check. If they cluster around provider autonomy, supplier team, service levels, change control and managed outputs, start with a service agreement.
The deal probably needs fuller review rather than guesswork. That is especially true where the contract says service agreement but the client really wants one embedded individual, or says consultancy agreement while the supplier is in fact selling a managed function with a team, SLAs and service credits.
If the draft also contains service risks beyond classification, compare it with our service agreement risks guide and service agreement clauses checklist.
Traditional lawyers remain valuable where the issue is bespoke structuring, dispute strategy, regulated-sector rules, public procurement or a genuinely contentious exit. Most businesses first need a clear answer on whether the draft is vendor paper, consultancy paper or something closer to a disguised employment problem. That is where AI review is especially useful.
Use this when you want a fast first pass on whether the draft really fits a service agreement, a consultancy agreement or a hybrid that needs restructuring.
Best for straightforward agreements where you want clause analysis, risk tags and plain-English explanation without going straight to a full law-firm review.
Best for PSC-based engagements, multi-schedule packs, service levels, processor clauses, board-level issues or serious IR35 sensitivity.
If the draft bundle also includes employment-style provisions, confidentiality side letters or post-termination restraints, compare it with our employment contract review, NDA review, non-compete clause guide, restrictive covenants guide and Contract Risk Check.
Straight answers to the questions businesses ask most often when deciding between consultancy paper and services paper in the UK.
Use the contract that matches what the business is actually buying. If the client is buying a managed service from a supplier that controls delivery, start with a service agreement. If the client is buying specialist expertise from a consultant, often through a PSC or on a named-individual basis, start with a consultancy agreement and assess IR35 and status risk at the same time.
In practice, yes, but not because one is a special statutory form and the other is not. The difference is commercial structure and legal risk. Consultancy agreements are usually used for specialist services from an independent consultant. Service agreements are usually used for the supply of services by a supplier business to a customer. The consequences then change because control, delivery structure, status and tax exposure change.
Yes. The label does not decide status. If the reality points towards worker or employee status, the issue can move beyond fees and termination into holiday pay, discrimination, working time and tribunal exposure. That is why control, personal service, integration and substitution matter so much.
No. The off-payroll rules only apply where the worker provides services through an intermediary and would have been an employee if engaged directly. Some consultancy agreements fall outside the rules. Some do not. The answer depends on the actual engagement, not on the heading on the front page.
No. A service agreement can still create off-payroll or status risk if it is really dressing up labour supply as supplier paper. A genuine managed service sits differently from a named-individual intermediary engagement, but the contract and the working model both need to support that position.
That is a different legal issue. A director's service contract has its own Companies Act meaning, and long guaranteed terms over two years can require member approval. If the person is both a director and a consultant, the board appointment, corporate governance and employment questions should be checked separately from the consultancy clauses.
For first-pass issue spotting, yes. AI is very good at identifying whether a draft looks like vendor paper, consultancy paper or something more risky, and at surfacing clauses on control, substitution, tax, IP, confidentiality, data and termination. For live disputes, regulated sectors, board appointments or heavily negotiated arrangements, human legal judgement still matters.
Sometimes. If the engagement is high value, strategically important, public sector, processor-heavy, cross-border, board-level, already contentious or obviously status sensitive, a solicitor adds real value. For routine pre-signature triage, AI is often the fastest and most cost-effective first step.
Treat those as separate risk layers. Review confidentiality documents separately, analyse restraint language on its own footing, and check any occupation or premises rights outside the service or consultancy analysis. Mixed document packs often contain more than one legal problem.
Vordex offers a standard review for £7.99 and a complex review for £17.99. The standard tier suits straightforward agreements. The complex tier is a better fit for PSC-based engagements, multiple schedules, service levels, processor clauses, board-level issues or serious IR35 sensitivity.
Want the wording checked against the working model? Start with Analyse Your Contract with AI or take a broader first pass through Contract Risk Check.
Vordex is a decision support tool and does not provide legal advice.