Starting a new business? Get 40% off our accountancy services for 3 months! 😀


Contractors which operate under the Construction Industry Scheme have to comply with strict regulations set by HM Revenue & Customs. Every month contractors have to inform HMRC of subcontractors that they have paid, within the scheme. This is done by completing and submitting a monthly CIS return to HMRC.

Sending a contractor’s monthly return online is recommended by HMRC, as this is the simplest and most efficient HMRC Advicemethod. To file the monthly CIS return online one of three methods can be used; either using the free CIS online service provided by HMRC, purchase commercial software capable of electronic CIS filing or by using the Electronic Data Interchange.

Once a contractor has registered with HMRC they will be sent a pack which will include a CIS300, a blank copy of the monthly CIS form. Towards the end of each month, which runs from the 6th of one month to the 5th of the next, HMRC will send a new monthly return to be completed. All details of payments and deductions made have to be listed on the contractor’s monthly return, using the gross amount paid before any deductions have been made.

Each monthly return has to be received by HMRC no later than the 19th of each month. Failure to meet this deadline will result in a £100 penalty charge. If a contractor doesn’t make any payments one month, a nil return should be filed or a £100 penalty charge will be levied. You can do this by paper return, filing electronically or by phoning the CIS helpline.

About The Author

Gary Fields

Content Writer working alongside our expert accountants to bring you the latest Tax and Accounting news.

More posts by this author
Inline Feedbacks
View all comments

Read more posts...

Umbrella Companies for Self-Employed Contractors

When you set up in business as a contractor you might either work as a sole trader or as a limited company….

Read More

Get Ready for Small Business Saturday UK 2022

Small Business Saturday started in the US in 2010, on the first Saturday following Thanksgiving. It aims to encourage shoppers to consider…

Read More

Architects and Tax

Architecture is a highly diverse sector when it comes to tax. It’s partly down to the type of businesses that carry out…

Read More
Back to Blog...

Confirm Transactions

The number of monthly transactions you have entered based on your turnover seem high. A transaction is one bookkeeping entry such as a sale, purchase, payment or receipt. Are you sure this is correct?

Yes, submit my quote
No, let me change it

Please contact our sales team if you’re unsure

VAT Returns

It is unlikely you will need this service, unless you are voluntarily registered for VAT.

Are you sure this is correct?

Yes, the business is VAT registered
No, let me change it

Call us on 020 3355 4047 if you’re not sure.


You only need this service if you want us to complete the bookkeeping on your behalf.

Would you prefer to complete your own bookkeeping?


Call us on 020 3355 4047 if you’re not sure.