Status Determination Statement (SDS): Guide, Checklist & Template (IR35)
A Status Determination Statement (SDS) is the written outcome of an IR35/off-payroll status assessment. It should clearly state the status decision and the reasons behind it, and it forms part of an organisation’s compliance record.
This guide explains who needs an SDS, what makes it “valid”, how it moves through the supply chain, and how to handle disagreements within the required timeline.
📑 Table of Contents
- Who needs an SDS (and when you don't)
- What a "valid" SDS must include
- Supply chain: who gets it and who becomes the deemed employer
- The 45-day disagreement process
- Practical SDS checklist (reasonable care pack)
- SDS template (structure you can reuse)
- Common mistakes (and how to avoid them)
- CEST vs third-party tools
- FAQ
Who needs an SDS (and when you don't)
If you’re a public sector client, the off-payroll rules apply.
In the private/voluntary sector, the “client” typically applies the rules only if it’s medium or large, based on meeting 2 of 3 conditions (turnover, balance sheet total, employees). If the client is small, they’re generally outside these reformed off-payroll obligations.
Practical takeaway:
If you’re the end client and you’re medium/large, you should have an SDS process for in-scope contractor engagements.
Reference: GOV.UK – Off-payroll working for clients
What a "valid" SDS must include
For an SDS to be valid, it must:
1. Status Decision
Include the status decision (employed or self-employed for tax purposes)
2. Reasons
Contain the reasons for that decision (based on employment status indicators)
3. Reasonable Care
Be reached with reasonable care
HMRC guidance notes that the CEST output can be used as an example of a valid SDS, and if you use a third-party tool, you still need to ensure the output meets the valid SDS requirements.
Supply chain: who gets the SDS and why it matters
While the rules don’t “force” a specific distribution method, in practice you must ensure the SDS is shared properly because liability follows it.
Until the SDS is passed down The client remains responsible
as the deemed employer (PAYE liabilities).
When passed to next party
Parties in the chain may also have obligations to pass it on, or they can become the deemed employer.
Final responsibility
The party who fails to pass it down the chain becomes liable for tax obligations.
Key point:
Don’t assume someone else will distribute the SDS. Keep clear records of who received it and when.
The 45-day disagreement process
If a worker (or deemed employer in the chain) disagrees with an SDS, the client must, at minimum:
- Consider the representations
- Keep the tax treatment unchanged while considering
- Respond within 45 calendar days
Critical deadline:
If the client fails to respond within 45 days, the client becomes the
deemed employer for PAYE purposes
until they respond.
What your response should do:
Option 1: Confirm
Confirm the original decision with reasons
Option 2: Withdraw & Replace
Withdraw it and issue a new SDS, effective from a stated date
Practical SDS checklist (your "reasonable care" pack)
To make your SDS process defensible and repeatable, keep an audit pack with:
- Contract + any statement of work / role description
- Summary of working practices (who controls work, substitution in reality, supervision, etc.)
- Decision + reasons mapped to evidence (quote the clause or describe the practice)
- Who reviewed/approved + date/time
- Version of the method/tool used
- A clear disagreement contact point and mailbox
- Copies of any representations and your responses
Why this matters:
This aligns with HMRC’s emphasis that the client must take
reasonable care
and that an SDS lacking the required criteria shifts liability back to the client.
SDS template (structure you can reuse)
Use this structure (works as a PDF, email, or portal output):
1. Engagement details
- Worker / PSC name
- Client name
- Role / project
- Start date (and end date if known)
- Contract reference/version
2. Status decision (tax)
“If engaged directly, the worker would / would not be an employee for tax purposes.”
3. Reasons (short + specific)
For each factor:
- Outcome (supports employed / self-employed)
- Evidence from contract (clause reference)
- Evidence from working practices (1–2 sentences)
4. Conclusion
- Final determination (and confidence, if you use it)
- Date effective from
5. Disagreement process
- Where to send representations
- Response timeline (45 days)
6. Sign-off
- Name/role of approver
- Date/time
Ready to generate your SDS?
Use our automated SDS generator to create a compliant statement with all required elements.
Common mistakes (and how to avoid them)
Only saying "inside/outside IR35" without proper reasons.
HMRC guidance says that advertising expected status alone is not sufficient for a valid SDS.
Not recording evidence (or not involving the hiring manager)
Disagreements often turn on day-to-day practices.
Not passing the SDS down the chain
This leaves the client exposed as deemed employer.
Not responding to disagreements within 45 days
Failure to respond makes you the deemed employer.
CEST vs third-party tools
| Aspect | CEST (HMRC tool) | Third-party tools |
|---|---|---|
| HMRC stance | HMRC will stand by CEST results if the information input is accurate and used according to guidance | HMRC expects the SDS output to meet the "valid SDS" requirements (decision + reasons + reasonable care) |
| Detail level | Basic status determination | Often provides more detailed reasoning and contract analysis |
| Validity | Accepted as valid SDS example | Must ensure output meets all validity criteria |
Bottom line:
Whether you use CEST or a third-party tool, ensure your SDS includes the status decision, clear reasons, and evidence of reasonable care.
References: Part 9 | CEST Manual
Frequently Asked Questions
Who issues the SDS?
The client makes the determination and must ensure the SDS includes the status decision, reasons, and is reached with reasonable care.
Reference: GOV.UK Part 9
How long do we have to respond to disagreements?
Clients must respond within 45 calendar days of receiving a disagreement. Failure to respond within this timeframe makes you the deemed employer for PAYE purposes.
Reference: GOV.UK Part 10
What makes an SDS valid?
A valid SDS includes the status decision (employed or self-employed for tax purposes), the reasons for that decision, and must be reached with reasonable care.
Reference: GOV.UK Part 9
Can contractors issue their own SDS?
No. Only the end client (or an authorised party acting for them) can issue a valid SDS. Contractors can use assessment tools to understand their likely status, but this doesn’t replace the client’s legal obligation.
What happens if we get the status determination wrong?
If the client has taken reasonable care in making the determination, they have some protection. However, if HMRC determines the status was wrong and reasonable care wasn’t taken, the client may be liable for unpaid taxes and penalties.
Do working practices override the contract?
Both matter. While contracts set out intentions, HMRC will look at the reality of the working relationship. If working practices differ significantly from the contract, this can affect the status determination.
Does an SDS have to be a specific format?
No — it can be paper or electronic documentation as long as it meets the validity conditions (status decision, reasons, reasonable care).
Reference: GOV.UK Part 9
What if we don't pass the SDS down the supply chain?
You can remain the deemed employer (PAYE responsibilities) until it’s passed on. This means you’re liable for tax obligations.
Reference: GOV.UK Part 9
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