You must tell HM Revenue and Customs (HMRC) each month about payments you’ve made to subcontractors through your monthly return.
You can file returns by using:
- the HMRC CIS online service
- some commercial CIS software
- the paper CIS monthly return (CIS 300) - call the CIS helpline to get a form
On your return, you must declare that the subcontractors listed aren’t employees.
You could get a penalty of up to £3,000 if you give the wrong employment status for a subcontractor on 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.
You can file returns for several subcontractors using the Electronic Data Interchange (EDI) system.
Send your monthly returns to HMRC by the 19th of every month following the last tax month.
Example If you’re making a return for the tax month of 6 May to 5 June, it must reach HMRC by 19 June.
Penalties for late returns
You’ll get a penalty if you miss the deadline for filing returns.
The penalty will be cancelled if you let HMRC know that you didn’t pay any subcontractors that month.
|How late the return is||Penalty|
|1 day late||£100|
|2 months late||£200|
|6 months late||£300 or 5% of the CIS deductions on the return, whichever is higher|
|12 months late||£300 or 5% of the CIS deductions on the return, whichever is higher|
For returns later than this, you may be given an additional penalty of up to £3,000 or 100% of the CIS deductions on the return, whichever is higher.
Pay your late filing penalty.
If you disagree with a penalty
You can appeal within 30 days of the date on the penalty notice:
- through HMRC’s online service
- by writing to HMRC - quote your Unique Taxpayer Reference (UTR) and the payment reference shown on the notice
Correcting or changing returns
If you make a mistake on your return, or need to change something, call the CIS helpline.
You can also write to HMRC.