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Confirm CIS 300 Monthly Returns Data   Warning : Committing the CIS 300 Monthly Returns Data You have reached the final stage of the CIS 300 Monthly Returns approval process. Once you click on the yellow coloured Confirm CIS Data button, the whole period's data will be committed as the final data. Important Note: There is no rollback for CIS 300 Monthly Returns data. Once it is committed, there is no way you can change it. Should you discover any error, you can only rectify it through corresponding to the HMRC, outside our system. Back button: If you want to check your CIS 300 Monthly Returns data again, please click on the Back button.