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Submitting your CIS300 Return

How to download and submit your return to HMRC.

Sabrina Trivedi avatar
Written by Sabrina Trivedi
Updated over a year ago

As you will know, the CIS300 is to be submitted to HMRC by the 19th of each month. We've made it really easy to do so in MDA, here's how...

First, go to Payroll> RTI eSubmission> CIS300 Return

You will be taken to a summary page showing any previous submissions and in the top right corner there will be a 'Create' button.


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Click on this and then choose the tax year and tax month that you are submitting the return for. Then press "Create".

Once you submit, you will have the option to 'Download and Verify' the return. Clicking on this will open up an excel version of the return for you to review.

Once you have downloaded and are happy with the figures, just press "Submit".

The CIS Status will then change to 'Successful' , and that's it! Easy as πŸ₯§

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