When you receive the 1046 error message, this is because the details entered when attempting to file are incorrect, or they do not match what HMRC are expecting. To go through this error message, please see the below instructions or download our PDF step by step guide. Step 1: Check User ID and...

If, after making a successful submission, you need to make changes and file an amended return. Please see the video tutorial for a walk through of the process. Alternatively, please follow these written steps: Make your corrections. Click on Check & Finish. Check and review your...

To register for online filing as an agent with HMRC you'll need an Agent Reference Number. Apply to your local tax office or apply online via the HMRC Online Services if you're overseas. Once you've received your Agent Reference Number, follow these steps: Go to the New user page on the HMRC...

For the tax year ending 5 April 2018, the deadlines for self-assessment tax returns are: 31 October 2018 – paper. 30 December 2018 – online if you owe less than £3,000 and want it collected through next year's tax code. 31 January 2019 – online. If you miss the deadline you'll be...

If you want to file a paper return, you can print your return using TaxCalc and then send this by post. PLEASE NOTE: When you print the return, you must ensure that you print the return in greyscale or colour. Black and white returns will be rejected. The paper return deadline is 31 October 2019...

If you receive a connection error message when attempting to submit an online tax return, this means that your submission isn't getting through to the Gateway quickly enough and the Gateway has closed the internet connection to prevent it becoming blocked. The likely causes of this error are...

HMRC places restrictions on when you can file an amended CT600 return online: You can only file an amended return within 12 months of the filing date. In the case of a return for the wrong period, you can only file within 12 months of what would be the filing date if the period for which you...

To enter/edit your Company details, address, email etc, follow these steps: Click on Help > Application Settings. Click on Firm Details on the left. Double click on Main Office in the middle. Click on Contact Details. Enter the details as required on this page. Please Note: Main email is...

HMRC has introduced a validation upon submission to try and reduce the number of submissions where the Company Registration Number (CRN) used in the CT600 and the attached accounts doesn't belong to the submitting company. Submissions that fail the validation will generate the following error...

An online amendment would've been sent to HMRC if the Amended box was ticked in the online filing settings page when you filled in your original return. If you haven't submitted the original return yet, follow these steps: Click on Check and Finish. Click on File online. Click on Re-submit...