Submit your CIS Monthly Return (CIS 300)

CIS reports will only include transactions entered after CIS has been activated.

Submissions made via Accounting should only be done if all transactions were entered using the CIS feature.

If you have a combination of transactions entered using another system and transactions entered using our CIS feature:

Learn more about your monthly CIS obligations, deadlines, and record-keeping.

You must tell HM Revenue and Customs (HMRC) each month about payments you’ve made to subcontractors through your monthly return
You don't have to file a return for the months when you made no payments to subcontractors, but you must tell HMRC that no return is due
If you make deductions, you must send a payment and deduction statement to your subcontractor within 14 days of the end of each tax month

Deadlines

Send your monthly returns to HMRC by the 19th of every month following the last tax month. You’ll get a penalty if you miss the deadline for filing returns.

Record Keeping

Under CIS you must keep records of:

The gross amount of each payment invoiced by subcontractors, excluding VAT
Any deductions you’ve made from subcontractor payments
The costs of materials invoiced by the subcontractor, excluding VAT
The details must be kept for at least 3 years after the end of the tax year they relate to

How to Submit your CIS 300 Monthly Return

Create and submit your monthly return

Follow these steps to complete your monthly submission:

Select Reporting.
Under Construction Industry Scheme Reports select CIS Monthly Return & subcontractor statements.
Select a CIS Reporting Period (the start date will always be from 6th of the month and the end date to the 5th of the following month).
Select Create CIS Return.
The report will generate and you'll see a summary of the payments and amounts deducted with your selected date range.
Confirm the amounts deducted values are correct, then select Submit to HMRC.
You might want to download and check your subcontractor statements before you submit your return. If they are incorrect you'll have to create a new return.
Review the CIS Submission & Declarations and select the Terms & Condition checkbox to confirm the information on the return is correct, then select Submit.
Enter your HMRC Credentials, then select Sign In & Submit.
It may take a few minutes for a response from HMRC.
- If the return has been submitted successfully you'll receive a confirmation message with the time and date of the submission and a reference number (IR Mark) as confirmation your return has been accepted. HMRC recommend you keep a copy for your records
- If the response from HMRC takes longer than 5 minutes you'll see a message to let you know. You'll be taken back to the CIS Monthly Returns List where you'll see the status of the return updated to Submitting to HMRC. You can refresh the screen for status updates
- If your submission fails, select Close and try submitting again
CAUTION: You may receive an email from HMRC to confirm their servers have received your return. This is not a confirmation of a successful submission. To confirm your return has been submitted successfully, check the status of your return in the CIS Monthly Returns List or check the Government Gateway portal.

Resubmit a return

If you need to make changes to a CIS Return you've already submitted, you can send another return to HMRC to replace your first submission.

You'll need to do this if you have deleted or amended a payment already allocated to a CIS invoice.

Rather than amending an existing return, simply create a new return for the same period. Follow the same steps as you did to create and submit your monthly return.

Submit manually

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What you need to know

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