Before a first payment, it is tempting to collect a name, ask for an invoice and assume the CIS details will sort themselves out later. That is where an avoidable interruption begins. A spelling difference, the wrong business type or a missing identifier can make a verification response unusable when the payment run is due.
Use this checklist to organise a secure record before you submit a verification through HMRC's online service or compatible commercial software. It is deliberately a preparation tool: the verification result still comes from HMRC.
1. Confirm the job and the party you are dealing with
- [ ] Record the job or contract reference and the construction work being supplied.
- [ ] Confirm who will contract and invoice: an individual, limited company or partnership. Do not infer the legal party from a trading name alone.
- [ ] Record the named person in your business who owns the relationship and the next action.
- [ ] Keep the signed or agreed engagement and change records with the job file where relevant.
This checklist does not determine whether someone is employed or self-employed. Deal with status separately before treating a person as a subcontractor.
2. Prepare the contractor details securely
HMRC's CIS verification process uses your contractor identifiers. Keep them in your protected payroll or tax record, not on an exported job checklist.
- [ ] Have the contractor UTR available.
- [ ] Have the Accounts Office reference available.
- [ ] Have the PAYE employer reference available.
- [ ] Confirm the person submitting the verification is authorised to use the account or software.
3. Obtain the subcontractor identity that matches its registration
Use the business type that actually applies and check the details against the source supplied by the subcontractor. Do not put the completed personal identifiers into a public template or an unsecured email trail.
| Business type | Secure information to obtain before verification |
|---|---|
| Sole trader | Individual's name, UTR and National Insurance number |
| Limited company | Company name, company UTR and Companies House registration number |
| Partnership | Partnership trading name, partnership UTR and the nominated partner's name and UTR |
- [ ] Check the spelling, order of names and company/partnership identity against the provided record.
- [ ] Record a secure contact route if the information needs correcting.
- [ ] Do not substitute a temporary, guessed or copied identifier for missing information.
4. Verify and retain the HMRC response
- [ ] Submit the verification through HMRC's online service or compatible commercial software before payment.
- [ ] Record the verification reference and the response in the secure CIS record.
- [ ] Record the deduction or gross-payment outcome returned for the subcontractor; do not assume the outcome.
- [ ] Keep the response with the payment and return records required for the engagement.
- [ ] If the subcontractor is already known, check whether an earlier verification can still be relied on under HMRC's current CIS rules rather than assuming it is permanent.
5. Before each payment run
- [ ] Match the invoice/payment request to the verified legal party and the correct job.
- [ ] Separate eligible materials from the amount subject to any CIS deduction using your evidence and current guidance.
- [ ] Keep the payment calculation, deduction statement and return preparation within the normal payroll/CIS process.
- [ ] Escalate identity mismatches, missing evidence or a changed trading entity before releasing the payment.
Quick record fields
| Field | Keep in the protected CIS record |
|---|---|
| Job / engagement reference | Yes |
| Legal trading entity and business type | Yes |
| HMRC verification reference and date | Yes |
| HMRC response / deduction outcome | Yes |
| Responsible person and next action | Yes |
| Personal identifiers | Yes, but only in access-controlled records |
Common mistakes this checklist is designed to prevent
- Verifying a trading name when the person paid is a different legal entity.
- Treating a previous result as valid without checking whether current CIS rules allow reliance on it.
- Leaving verification until the payment run.
- Recording sensitive identifiers in an open spreadsheet, site WhatsApp group or public template.
- Assuming CIS answers employment-status, VAT or contractual questions.
Related FoxSums resources
- CIS for Construction and Trades: Contractor and Subcontractor Guide
- Monthly CIS Contractor Checklist
- CIS Labour and Materials: What Gets Deducted?
- CIS Deduction Calculator for Contractors
Next step
Use the printable checklist to confirm what is held securely before verification or a first payment.
Important
General information only. Check the facts and current official guidance for the business’s circumstances.
Sources and review
- Evidence check date: 3 November 2026. This is a specialist construction and trades resource; it is not presented as general small-business compliance guidance.
- GOV.UK - Verify subcontractors
- GOV.UK - CIS contractor deductions and payment statements
- GOV.UK - CIS monthly returns
- GOV.UK - CIS340