What will I gain by sending in my monthly CIS return online?
Your CIS return needs to be with the Taxman by the 19th of every month, even if you have no payments to report. If you submit the return online you don’t have to allow for the time a letter takes in the post. The online service is available 24 hours a day, so you can do your return at any time it suits you. You gain peace of mind knowing your return has arrived safely as you get an instant acknowledgment with an online return. As long as you receive this acknowledgment by midnight on the 19th of the month you can also be sure you won’t get fined for submitting a late return.