20+ Years Experience in CIS Compliance

CIS Scheme

There is a special scheme for self-employed contractors and sub-contractors working in the construction industry called the Construction Industry Scheme (CIS).

Site managers
PORTAL & APP

We know CIS so

you don't have to

Sovereign Plus has been working in the field of CIS for over 20 years and ensure all contracts with clients and subcontractors are legally robust and all tax on subcontractors’ payments is accounted to HMRC.

Who?

All construction operatives are required to be registered for CIS. Subcontractors are not legally required to sign up, but deductions from payments increase from 20% to 30% if not registered.

Why?

The scheme exists to prevent fraudulent employment and tax evasion. Under the scheme, contractors deduct money from payments made to subcontractors at a standard rate pf 20% and pay it directly to HMRC. These count as advance payments towards tax on behalf of the subbie.

How it works

Simple HMRC verification process to determine the status of subcontractors

We check all subbies to determine their status when they register.

Gross no Tax

Gross No TaxIf they are ‘Gross’ no tax deduction is applied

CIS Registered

If they are CIS registered, a 20% deduction is applied

Non Registered

If they are unregistered with CIS, a 30% deduction is applied – we will then ensure they register for CIS

What Sovereign PLus do

The Risk of CIS Penalties

The Construction Industry Scheme tax system is backed up by penalties. Penalties cover situations such as: Incorrect monthly returns submitted fraudulently or negligently, Failure to provide CIS records for HMRC to inspect, Incorrect declarations regarding employment status

£100 Fine

Failure to submit monthly return, (including a nil return) by the correct date.

Additional £200 Fine

If monthly return is still outstanding after two months.

Additional £300 Fine

If monthly return still outstanding after three months OR 5% of the CIS deductions from the return (whichever is higher), and additional increases for returns that remain outstanding at 6 and 12 months.

Loss of Gross Payment Status

Under the CIS scheme, HMRC is reviewing every firm’s status and payment history and estimate that 40% are failing the test.

 

HMRC can levy up to £3,000 per monthly return submitted if you incorrectly tick the self-employed status declaration when your sub-contractors should have been employed.

Responsibilities

Your CIS responsibilities to HMRC are to:

Verify

Verify each sub-contractor with HMRC before you pat them, and Calculate and deduct CIS tax in accordance with the verification details

Inform

Inform the sub-contractor the amount that they will be paid

Submit

Submit your CIS300 report by the 17th of each month, detailing all payments made to, and deductions collected from sub-contractors

Nil Return

You must submit a “nil return” even if no sub-contractors are paid

Payment Statement

Provide a payment statement to the sub-contractor at least monthly

Resources

Useful Links For CIS Scheme

Still not sure? Find resources to useful articles about CIS below.

July 7, 2026

What is IR35

In simple terms… Under the Domestic Reverse Charge, the subcontractor doesn’t charge VAT on their invoice. Instead, the contractor accounts for the VAT directly with

Construction Manager at Desk

July 7, 2026

Understanding the Domestic Reverse Charge

Understanding the Domestic Reverse Charge (DRC) In simple terms… Under the Domestic Reverse Charge, the subcontractor doesn’t charge VAT on their invoice. Instead, the contractor

July 7, 2026

CIS Crackdown, Kickbacks & the Fair Work Agency. What Construction Companies Need to Know

The construction industry is entering a period of increased scrutiny. Between tighter CIS enforcement, the introduction of the Fair Work Agency, and ongoing concerns around

Get Started

Ready to remove the compliance burden?

Book a no obligation call and see how Sovereign Plus can take the risk out of your subcontractor supply chain.