Status Determination Statement (SDS) Template for UK IR35 Compliance

If you engage contractors through their own limited companies (or other intermediaries), IR35 and the off-payroll working rules can quickly become one of those “we’ll deal with it later” compliance tasks.

But in practice, IR35 is one of those areas where getting it wrong can become expensive (and time-consuming) fast - especially if you don’t have a clear paper trail showing how you made your decision.

That’s where a Status Determination Statement (SDS) comes in. In this guide, we’ll explain what an SDS is, when you need one, and we’ll walk you through a practical template you can use to support your IR35 processes.

Important: This article is general information for UK businesses and isn’t legal or tax advice. IR35 decisions are fact-specific, and it’s often worth getting tailored advice before you roll out a process across lots of contractors.

What Is A Status Determination Statement (SDS) And Why Does It Matter?

A Status Determination Statement is a written statement prepared by the end client (you, as the business receiving the contractor’s services) setting out:

• your conclusion about whether the contractor would be an employee for tax purposes if they were engaged directly (instead of through an intermediary), and
• your reasons for reaching that conclusion.

In other words, the SDS is the document that captures your IR35 decision: “inside IR35” (treated like employment for tax) or “outside IR35” (genuine self-employment for tax).

From a small business perspective, the SDS matters because it helps you show you’ve taken the rules seriously and followed a structured process. If HMRC ever questions your approach, your SDS and supporting evidence may be one of the first things you rely on.

What The SDS Is Trying To Capture (In Plain English)

IR35 status is not decided by what you call someone (“contractor”, “consultant”, “freelancer”). It’s decided by the reality of the working relationship.

While the tests can get technical, most determinations come back to practical questions like:

• Control: Are you directing how the work is done, or just setting outcomes and timelines?
• Substitution: Can the contractor send a substitute to do the work, and is that a genuine right in practice?
• Mutuality of obligation: This is a nuanced factor. Broadly, does the engagement look like an ongoing obligation to offer and accept work (beyond the agreed scope), or is it a defined project where either party can walk away at the end without an expectation of more work?
• Integration: Do they look and operate like part of your team (line management, internal duties, staff benefits), or like an independent supplier?
• Financial risk / “in business on their own account”: Do they bear risk, provide equipment, quote for work, and have an opportunity to profit?

This is also why your contracts matter. The written terms should reflect (and support) the real working arrangements. Depending on the engagement, you might document this using a tailored Contractor Agreement or Consulting Agreement, rather than a generic template.

When Do UK Small Businesses Need To Provide An SDS?

You generally need to issue an SDS where the UK off-payroll working rules apply and you’re the end client receiving the services.

As a starting point, the obligation to make a determination and issue an SDS typically applies to:

• medium and large private sector clients, and
• public sector clients.

Many “small” businesses are outside the scope of the private sector off-payroll working rules. In broad terms, you’re usually treated as “small” for these purposes if you meet two or more of the following (and you’ll want to check the rules carefully if you’re close to the line):

• annual turnover of £10.2 million or less
• balance sheet total of £5.1 million or less
• 50 employees or fewer

If you’re genuinely outside scope as a small private sector client, the contractor’s intermediary may remain responsible for IR35 compliance instead. However, the “small” definition is specific and can change as your business grows, so it’s worth checking rather than assuming.

Even If You’re “Small”, An SDS-Style Process Can Still Help

Even where you’re not legally required to issue an SDS, having a consistent assessment process can still be a smart risk-management move - especially if:

• you engage a lot of contractors,
• you work with contractors in “employee-like” roles, or
• you’re preparing for growth and may soon fall within scope.

It also helps you spot engagements that are drifting into employment territory, where you may need to consider whether an Employment Contract is actually the safer and more accurate option.

What Must An SDS Include For IR35 Purposes?

An SDS doesn’t need to be long or overly legalistic, but it does need to do the essentials well. From a practical small business perspective, a strong SDS should include:

• Identification details: who the determination is for (contractor name, intermediary, role, project).
• The determination: inside IR35 or outside IR35.
• Clear reasons: the factual basis for your conclusion (control, substitution, mutuality, etc.).
• Who prepared/approved it: a responsible person within your organisation.
• Date and period: when it applies from, and what engagement it covers.
• Confirmation it’s been communicated: sent to the contractor and (where relevant) the fee-payer/agency.
• Status disagreement process: how the contractor can challenge it and how you will respond.

One of the most common issues we see is a “tick-box” determination with no meaningful reasoning. If your SDS says “outside IR35” but can’t explain why, you’re leaving yourself exposed.

Your SDS Should Match Your Real Working Practices

It’s not enough for the SDS to sound right. The day-to-day reality has to line up too.

For example, if you write that the contractor has autonomy, but you then:

• require them to work set hours like employees,
• manage them through the same performance processes as staff, or
• deny any meaningful right of substitution,

that mismatch can undermine your determination.

Getting your documentation aligned across your engagement paperwork is key - including any confidentiality terms (for example, a tailored Non-Disclosure Agreement) and project terms (often covered in a Service Agreement).

Status Determination Statement Template (SDS) For UK Businesses

Below is a practical SDS template you can adapt for your business. You’ll still need to tailor it to the engagement and your actual working arrangements - don’t copy/paste without checking it reflects reality.

Tip: For higher-risk roles (e.g. long-term contractors embedded in your team), it can be worth doing a short internal “evidence pack” alongside the SDS (emails, project scope, onboarding notes, substitutions discussion, etc.).

1) SDS Template: Core Details

STATUS DETERMINATION STATEMENT (SDS) – IR35 / OFF-PAYROLL WORKING

1. Client Details
Client name:
Registered address:
Company number (if applicable):
Primary contact:

2. Worker / Contractor Details
Worker name:
Intermediary name (e.g. personal service company):
Intermediary address:
Role/title:
Engagement start date:
Engagement end date (if fixed-term):
Work location(s) / remote arrangement:

3. Engagement Summary
Brief description of services being provided:
Project/deliverables:
Who the services are provided to (team/department):
Key milestones / deadlines (if any):

2) SDS Template: Your Determination

4. Status Determination
After assessing the engagement, the Client determines that the engagement is:

[ ] OUTSIDE IR35 (the worker would be self-employed for tax purposes if engaged directly)
[ ] INSIDE IR35 (the worker would be an employee for tax purposes if engaged directly)

5. Date Of Determination
This SDS is issued on: 
This determination applies from: 
This determination applies to: 

3) SDS Template: Reasons (The Most Important Part)

This section is where you should be specific and factual. Try to avoid vague statements like “the contractor has autonomy” without explaining what that looks like in practice.

6. Reasons For Determination

A. Control
- Who decides how the work is done?
- Who decides working hours / schedule?
- Who decides where the work is done?
- Who supervises or manages the worker day to day?

Client’s assessment (facts):

How this supports the determination:

B. Right Of Substitution / Personal Service
- Is there a contractual right to provide a substitute?
- Has substitution been discussed or used in practice?
- Can the Client refuse a substitute, and on what grounds?

Client’s assessment (facts):

How this supports the determination:

C. Mutuality Of Obligation (MOO)
- Is the Client obliged to provide ongoing work beyond the agreed scope?
- Is the worker obliged to accept additional work?
- Can either party decline further work at the end of the project?

Client’s assessment (facts):

How this supports the determination:

D. Financial Risk / Equipment / Opportunity To Profit
- Does the worker quote a fixed price or work on time/materials?
- Does the worker correct defects at their own cost?
- Who provides equipment/software?
- Can the worker make a profit through efficiency?

Client’s assessment (facts):

How this supports the determination:

E. Integration / Part And Parcel
- Does the worker appear on internal org charts?
- Do they manage employees?
- Do they receive employee benefits?
- Do they have an internal role beyond delivering services?

Client’s assessment (facts):

How this supports the determination:

F. Other Relevant Factors
- Exclusivity / ability to work for other clients:
- Length and nature of engagement:
- Any other relevant facts:

Client’s assessment (facts):

How this supports the determination:

4) SDS Template: Evidence You Relied On

This doesn’t need to be extensive, but it’s helpful to show you didn’t guess. List what you reviewed.

7. Evidence Reviewed
The Client considered the following evidence when making this determination:
- Contract/statement of work dated: 
- Role description / scope document dated: 
- Discussions with: 
- Confirmation regarding substitution dated: 
- Other relevant documents: 

5) SDS Template: Communication And Dispute Process

If you’re required to have a status disagreement process, make sure it’s clear and actually workable in your business (i.e. someone is responsible for responding, and you have a timeframe you can meet).

8. Communication Of This SDS
This SDS has been provided to:
- The worker / contractor: 
- The fee-payer (if different, e.g. agency): 

Method of communication:
[ ] Email
[ ] Contractor portal
[ ] Other: 

9. Status Disagreement Process
If the worker disagrees with this determination, they may submit a written challenge to:
Name/role:
Email:
Postal address (optional):

The challenge should include:
- The reasons for disagreement, and
- Any supporting evidence or relevant information.

The Client will respond in writing within 45 days, confirming either:
- the determination is upheld (with reasons), or
- the determination is withdrawn and replaced (with reasons).

6) SDS Template: Sign-Off

10. Approval / Sign-Off
Prepared by:
Role:
Signature (optional):
Date:

Approved by (if different):
Role:
Signature (optional):
Date:

Once you’ve drafted your SDS, you should store it with the relevant engagement documents and ensure your operational teams understand it (so the day-to-day working arrangements don’t accidentally drift away from what the SDS says).

How Do You Implement SDSs In A Small Business Without Creating Admin Chaos?

A good SDS process should protect your business - not slow it down.

For most small businesses, the key is to build a repeatable workflow that’s light-touch for low-risk engagements and more detailed for higher-risk ones.

Step-By-Step: A Practical SDS Process

1. Identify which engagements need an SDS. Start with contractors operating through intermediaries, and assess whether the off-payroll rules apply to you.
2. Collect the right information early. Before the contractor starts, confirm scope, deliverables, reporting lines, location expectations, substitution, and how payment will work.
3. Align the contract terms with reality. Your agreement should reflect how the contractor will actually work (not just what “sounds good”).
4. Draft and approve the SDS. Keep it consistent: same structure each time, signed off by a responsible person.
5. Issue the SDS before (or at) commencement. This reduces disputes later and helps your team work to the right model from day one.
6. Have a disagreement route that someone owns. If a contractor challenges, you need a clear internal owner to respond.
7. Review if things change. If the engagement changes materially (new duties, new reporting lines, extension that makes the role look “permanent”), review the SDS.

Watch Outs That Often Undermine An “Outside IR35” SDS

Even with a well-written Status Determination Statement, practical behaviours can undermine it. Common examples include:

• Role creep: the contractor starts taking on BAU duties that look like an employee role.
• Internal management: they’re managed like staff (appraisals, disciplinaries, approval chains for routine tasks).
• Fixed hours and constant availability expectations: especially where this goes beyond what’s needed to deliver the project.
• Exclusive engagement in practice: the contractor can’t realistically work for other clients.

It’s also worth remembering that IR35 sits alongside other legal compliance areas. For example, if you share personal data with contractors (customer data, employee data, system credentials), you may also need to put appropriate privacy and processing terms in place, often through a Data processing schedule.

Should You Use A Status Determination Statement Template Or Get One Drafted?

Templates are useful - especially if you’re trying to create a consistent internal process. But you should be careful with a generic Status Determination Statement template if:

• the contractor will be embedded in your business for a long period,
• the role is similar to an employee role (especially where you have employees doing similar work),
• you’re engaging via an agency and the supply chain is complicated, or
• you’ve had IR35 disagreements before.

In those cases, it’s often worth getting legal help to make sure your contracts and your SDS reasoning match your true working model - and that you’ve not accidentally created an “employment-like” arrangement on paper or in practice. (Tax status determinations themselves are ultimately your responsibility as the client, and you may also want input from a tax adviser.)

Key Takeaways

• A Status Determination Statement (SDS) is a written record of your IR35 decision and the reasons behind it, prepared by the end client where the off-payroll rules apply.
• A strong SDS should clearly set out who the decision relates to, whether the engagement is inside or outside IR35, and the practical reasons supporting that conclusion.
• Using a consistent template can help you build a repeatable process and create a useful evidence trail if HMRC ever questions your approach.
• Your SDS should align with the real working relationship - not just the wording in your paperwork - otherwise the determination may be undermined.
• Implement an SDS workflow that’s manageable for a small business: identify relevant engagements, document the facts early, issue the SDS, and keep a clear disagreement process.
• If a contractor engagement is long-term or “employee-like”, it’s worth getting tailored advice and ensuring your contracts are properly drafted for the reality of how you operate.

If you’d like help putting together an SDS process for your contractor engagements (or reviewing your contracts to support IR35 compliance), you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.