Using HMRC's Online CIS Service: Step by Step

Getting Started with HMRC's CIS Online Service

HMRC provides an online CIS service through the Government Gateway that allows contractors and subcontractors to manage their CIS affairs digitally. It is the primary way most construction businesses interact with HMRC for CIS purposes.

Here is how to use it for the key CIS tasks.

Setting Up Your Account

Step 1: Create a Government Gateway Account

If you do not already have a Government Gateway account:

1. Go to GOV.UK and search for "Government Gateway"
2. Select "Create sign in details"
3. Enter your email address
4. Create a password
5. Set up two-factor authentication (you will need a mobile phone)
6. Note your Government Gateway User ID — you will need it every time you sign in

Step 2: Enrol for CIS

Once you have a Government Gateway account, you need to enrol for the CIS online service:

1. Sign in to your Government Gateway account
2. Go to "Services you can add"
3. Select "Construction Industry Scheme"
4. Enter your UTR and other required details
5. HMRC will send an activation code by post (allow 7-10 working days)
6. Once received, enter the activation code to complete enrolment

Registering as a Subcontractor

1. Sign in to your Government Gateway account
2. Navigate to the CIS section
3. Select "Register as a subcontractor"
4. Enter your personal details — name, National Insurance number, UTR
5. Provide your business details — trading name, address, type of construction work
6. Choose whether to apply for Gross Payment Status at the same time
7. Submit the registration

HMRC confirms registration within a few days. You will receive a letter confirming your status.

Registering as a Contractor

1. Sign in to your Government Gateway account
2. Navigate to the CIS section
3. Select "Register as a contractor"
4. Enter your business details — name, address, UTR, employer PAYE reference
5. Confirm the types of construction work you commission
6. Submit the registration

You will receive confirmation from HMRC, and your CIS contractor account will be set up for filing monthly returns.

Verifying Subcontractors Online

1. Sign in and go to the CIS section
2. Select "Verify a subcontractor"
3. Enter the subcontractor's details:
   • Full legal name
   • UTR
   • National Insurance number (sole traders) or Companies House number (companies)
4. Submit the verification request
5. HMRC returns a result immediately: gross (0%), net (20%), or unmatched (30%)
6. Note the verification reference number for your records

You can verify multiple subcontractors in a single session.

Submitting Monthly Returns

1. Sign in and go to the CIS section
2. Select "File a monthly return"
3. Select the tax month you are filing for
4. For each subcontractor paid during the month, enter:
   • Name and UTR
   • Verification number
   • Gross payment amount
   • Materials cost
   • Deduction amount
5. Make the employment status declaration
6. Review and submit the return
7. HMRC provides a confirmation receipt — save or print it

Filing a Nil Return

If you made no subcontractor payments:

1. Select "File a monthly return"
2. Select the tax month
3. Select "No payments made"
4. Confirm and submit

Checking Your CIS Account

Both contractors and subcontractors can view their CIS account online:

• Subcontractors can see deductions that contractors have reported on their behalf
• Contractors can see their filing history and any outstanding returns or payments

This is useful for reconciling your records with what HMRC holds. If there are discrepancies, contact HMRC early to resolve them.

Troubleshooting Common Issues

Cannot Sign In

• Check your User ID and password are correct
• Ensure two-factor authentication is set up on your current device
• If locked out, use the "Problems signing in" option to reset

Activation Code Not Received

• Allow 10 working days from enrolment
• Check the address HMRC has on file is correct
• Call HMRC to request a new code if it has been more than 10 days

Verification Returns "Unmatched"

• Double-check the subcontractor's details
• Ensure you are using their legal name (not trading name)
• Check the UTR and NI number are correct
• Ask the subcontractor to check their HMRC registration

Return Rejected

• Check all required fields are completed
• Ensure the figures are consistent (deduction = correct percentage of labour)
• Verify that you are filing for the correct tax month

Limitations of HMRC's Online Service

While the online service handles basic CIS tasks, it has limitations:

• It does not integrate with your accounting records
• You must manually enter all figures
• There is no automatic reconciliation with bank transactions
• It does not calculate deductions for you
• No deadline reminders beyond generic emails

For businesses with multiple subcontractors or complex CIS obligations, dedicated accounting software provides a better experience.

How Accounted Complements HMRC's Service

Accounted works alongside HMRC's CIS service, automating the data preparation:

• Transaction matching — CIS payments identified from your bank feed
• Deduction calculation — correct amounts calculated automatically
• Data ready for filing — figures prepared for entry into HMRC's system
• Digital records — everything stored and organised for compliance

Check our pricing page and simplify your CIS workflow.

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HMRC's online service is a start — Accounted takes you further. Sign up for Accounted and let Penny prepare everything you need for HMRC.