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Contractors in the construction industry are often extremely busy. Projects, staff, suppliers and deadlines all compete for attention.
Because of this, Construction Industry Scheme (CIS) administration is sometimes treated as a small monthly task. In reality, CIS involves several compliance steps that must be completed correctly.
Mistakes can lead to HMRC penalties, incorrect deductions, and additional administration.
For many construction businesses, managing CIS payroll for subcontractors alongside employee payroll can quickly become time-consuming.
CIS Payroll for Contractors
The Construction Industry Scheme (CIS) requires contractors to deduct tax from payments made to subcontractors.
These deductions must then be reported to HMRC each month.
Contractors are responsible for:
- Registering as a CIS contractor
- Verifying subcontractors with HMRC
- Applying the correct deduction rate
- Submitting monthly CIS returns
- Providing subcontractor deduction statements
- Paying CIS deductions to HMRC
Many construction companies manage CIS alongside their employee payroll, which is why CIS payroll support is often handled by payroll specialists.
CIS Deduction Rates for Subcontractors
The amount deducted depends on the subcontractor’s verification status.
| Subcontractor Status | CIS Deduction |
| Registered subcontractor | 20% |
| Unverified subcontractor | 30% |
| Gross payment status | 0% |
CIS deductions apply to labour costs only. Materials should normally be excluded.
Applying the wrong deduction rate is one of the most common CIS compliance mistakes.
Common CIS Payroll Mistakes Contractors Make
Even well organised businesses can run into CIS issues.
Some of the most common problems include:
Not verifying subcontractors
Contractors must verify subcontractors with HMRC before the first payment.
Incorrect deduction calculations
CIS deductions should only be applied to labour costs.
Late CIS monthly returns
CIS returns must normally be submitted by the 19th of each month.
Poor record keeping
Contractors must keep records of:
- Payments made
- Materials costs
- CIS deductions
- Subcontractor details
These records should normally be kept for at least three years.
Why Many Contractors Outsource CIS Payroll
As construction businesses grow, managing CIS internally can become more difficult.
Outsourcing CIS payroll can help contractors:
- Reduce compliance risks
- Ensure deductions are calculated correctly
- Submit CIS returns on time
- Provide clear subcontractor deduction statements
- Save time on administration
For many businesses, outsourcing CIS payroll allows them to focus on projects and operations rather than HMRC reporting.
CIS Payroll Checklist for Contractors
If you manage CIS in your business, this checklist can help keep things on track.
✔ Register as a CIS contractor
✔ Verify subcontractors before paying them
✔ Apply the correct deduction rate
✔ Deduct CIS from labour only
✔ Submit monthly CIS returns by the 19th
✔ Provide subcontractor deduction statements
✔ Keep payment records for at least three years
CIS Payroll for Contractors – Questions and Answers
Do subcontractors go through payroll?
No. Subcontractors are not employees, so they are not paid through PAYE payroll. However, their payments and deductions must still be reported to HMRC under CIS.
When are CIS returns due?
CIS returns must be submitted by the 19th of the following tax month.
For example, payments made in April must be reported by 19 May.
What happens if a CIS return is late?
HMRC may issue late filing penalties. Repeated late returns can increase the likelihood of compliance checks.
Do contractors need to verify subcontractors every month?
No. Verification usually takes place before the first payment.
Once verified, subcontractors normally keep the same CIS status.
Need Help With CIS Payroll?
Managing CIS deductions, subcontractor payments and monthly returns can take time.
Many construction businesses choose to outsource CIS payroll so they can focus on running their projects.
At Crystal HR & Payroll Ltd, we can help ensure deductions are calculated correctly and monthly returns are submitted on time. Get in touch to find out how we can help you
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