Status Determination Statement (SDS) Compliance Guide for HR & Procurement (IR35)
This guide is for HR, Procurement, and hiring stakeholders responsible for contractor engagement governance under the UK off-payroll working rules (IR35). It sets out what an SDS should contain, how to operationalise “reasonable care”, how to manage supply-chain communications, and how to run a dispute process with the required response timeline.
1. When You Need an SDS
You generally need an SDS for an engagement where:
- your organisation is the end client for the worker’s services, and
- the engagement is in scope of the off-payroll rules (commonly relevant to public sector and many medium/large private-sector clients).
Governance note: Treat “SDS required?” as a mandatory onboarding gate for contingent workforce procurement (before a worker starts delivering services).
2. What a "Valid SDS" Must Contain
A compliant SDS should include:
- Status conclusion: whether the worker would be treated as an employee for tax/NIC purposes if engaged directly.
- Reasons: the rationale for the determination (not just a label).
- Reasonable care: the client must take reasonable care in arriving at the determination.
Common failure mode: Producing a one-line “inside/outside” answer with no reasoning. HMRC guidance makes clear an SDS should include reasons and that merely advertising expected status isn’t enough.
3. RACI: Who Does What (HR/Procurement-Friendly)
Responsible
Hiring Manager (inputs working practices; confirms role realities)
Accountable
HR/Procurement (policy owner; ensures SDS exists before onboarding)
Consulted
Tax/Legal (edge cases, high-risk roles, disputes)
Informed
Agency/fee payer, worker/PSC (receive SDS; understand outcome)
4. A Practical "Reasonable Care" Workflow
Use this as your internal SOP:
Step A — Collect Inputs (Minimum Set)
- Contract (and any schedules / SoW)
- Role description and reporting lines
- Working practices confirmation (short questionnaire signed by hiring manager)
- Supply chain details (agency / fee payer; contact mailbox)
Step B — Determine and Document Reasons
Map key status factors to evidence:
- Control (who directs how/when/where)
- Substitution (genuine right + practical use)
- Mutuality/engagement style (ongoing obligation vs project deliverable)
- Equipment, financial risk, integration, exclusivity (as relevant)
Step C — Issue and Distribute the SDS
Share the SDS with:
- the worker/PSC, and
- the next party in the chain (typically the agency/fee payer).
Until the SDS is properly passed down the chain, risk can remain with the client.
Step D — Store the Audit Pack
Retain evidence to support later reviews/audits.
5. Supply-Chain Controls (Procurement Checklist)
Build these controls into your supplier onboarding:
- Contract requires agencies to provide accurate supply-chain information
- SDS distribution obligation (agency confirms receipt + onward transmission)
- A named mailbox for disputes/representations
- A rule that onboarding cannot complete without an SDS record ID
Operational tip: Track SDS issuance at “engagement/role” level, not only at worker level (roles can change).
6. Dispute/Representation Handling (45-Day Clock)
Your organisation should have a defined process for representations. HMRC guidance expects:
- you consider the representations,
- you respond either by confirming the SDS (with reasons) or issuing a new SDS,
- and you respond within 45 calendar days.
If you do not respond within the 45-day period, guidance explains the client can become the deemed employer for PAYE purposes until a response is made.
Procurement-friendly control: Create a ticketing workflow with SLA monitoring (45-day timer) and a standard response template.
7. What to Retain (Audit Pack Template)
Keep a single folder per engagement containing:
Core Documents
- Contract + SoW + role spec
- Working practices questionnaire (signed/dated)
- SDS PDF + distribution proof (email log or portal record)
Assessment Record
- Determination summary
- Reasons per factor with evidence snippets
- Approver name, role, timestamp
- Tool/method version used
Disputes
- Representation received (date/time)
- Analysis notes
- Final response and (if issued) replacement SDS
This is the easiest way to demonstrate “reasonable care” in a repeatable process.
8. Standard SDS Template (HR/Procurement Version)
1. Engagement details
- • Client legal entity
- • Worker/PSC
- • Role / project
- • Start date
- • Supply chain (agency / fee payer)
2. Status conclusion
“If engaged directly, the worker would / would not be an employee for tax purposes.”
3. Reasons (summary)
- • Control: …
- • Substitution: …
- • Other supporting factors: …
- • Working practices confirmation: …
4. Effective date and scope
- • Effective from: …
- • Applies to: role/project/contract version …
5. Dispute process
- • Send representations to: [email]
- • Client will respond within 45 calendar days.
6. Approval
- • Name / role / signature
- • Date/time
9. Frequently Asked Questions
Who issues the SDS?
The end client is responsible for the determination and for ensuring the SDS meets the validity conditions, including providing the status conclusion, reasons, and demonstrating reasonable care in the assessment process.
Do we need an SDS for every contractor?
If the engagement is in scope of the off-payroll rules, you should produce an SDS for the engagement/role and keep a record. This applies to most medium and large organisations acting as end clients.
What happens if we don't respond to a challenge?
HMRC guidance describes consequences if the client doesn’t respond within 45 days, including deemed employer exposure until a response is made. This means the client could become responsible for PAYE tax and National Insurance.
Is a tool output enough?
Tools can help, but you still need governance: working practices confirmation, sign-off, distribution evidence, and a dispute process. The tool output is just one element of demonstrating reasonable care.
How long do we have to respond to a disagreement?
Clients should respond within 45 calendar days of receiving a representation, either confirming the decision with reasons or issuing a new SDS. This timeline is specified in HMRC guidance.
What should we retain for audit?
Keep the contract and SoW, working practices confirmation, the SDS, evidence for each factor, approval records, proof of distribution, and dispute correspondence. This audit pack demonstrates your reasonable care process.
Related resources
Use these pages to support onboarding, audit packs, and stakeholder alignment.
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