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What is a 1046 authentication error?
When you receive a 1046 error message in TaxCalc (as shown above) after attempting to file tax return, it will be due to one of the following: HMRC do not recognise the filing credentials ( government gateway account user ID and password) which are entered in TaxCalc prior to the submission...
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13 May, 2025
Views: 133088
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How do I resubmit a return or file an amended return?
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...
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25 Mar, 2025
Views: 71795
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How long do I have to file an amended CT600 return?
Amended corporation tax returns can be filed online within 12 months of the original filing deadline. As the original filing deadline is normally 12 months after the accounting period end, you will usually have 2 years from the accounting period end to file an amended return. Once this submission...
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08 Sep, 2021
Views: 19093
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What's the deadline for my self-assessment tax return?
For the tax year ending 5 April 2025, the deadlines for self-assessment tax returns are: 31 October 2025 is the paper filing deadline. Please see our Knowledge Base article on: Can I file a paper return using TaxCalc? for further information on this. 30 December 2025 is the deadline to file...
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25 Mar, 2025
Views: 17617
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Can I file a paper return using TaxCalc?
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 2025...
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25 Mar, 2025
Views: 16446
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Connection error when submitting a tax return to HMRC
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...
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15 Jun, 2022
Views: 14047
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What tax years can I file online?
Self Assessment Filing Deadlines Your Self Assessment Tax Return (SA100, SA800, SA900) normally has to be completed and submitted to HMRC by 31st October following the tax year end (5th April) if you file on paper, or by 31st January following the tax year end if you file online. So the 2025...
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25 Mar, 2025
Views: 14008
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Where do I enter Filing Credentials for Tax Return Production?
To enter your HMRC Self Assessment and Corporation Tax Filing Credentials, please follow the below instructions: For your Firm's details: Launch Admin Centre > Applications Click on Tax Return Production > Customise TaxCalc Click on Filing Credentials on the left Enter in your HMRC...
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27 Jun, 2024
Views: 11022
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Why does the IRmark on a tax return change?
What is the IR Mark? The IR Mark is a software generated reference and assists in the creation of the File By Internet Receipt returned by HMRC. It is a mechanism which could potentially be used during investigations, to aid taxpayers and HMRC in ensuring that the submission sent and received...
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04 Jun, 2024
Views: 9952
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Delayed response / Return keeps polling when filing to HMRC
If you receive a status from HMRC of Delayed Response when attempting to file online, this usually means that HMRC's processing systems are very busy. This won't affect the submission of the return itself but it does mean that the Submission Finished message won't be as prompt as usual. When...
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26 Sep, 2023
Views: 7115
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#7752 – The CRN on the submission does not match the CRN for this Unique Taxpayer Reference
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...
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16 Mar, 2016
Views: 5896
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How do I get my proof of filing?
When you successfully file a return using TaxCalc, you'll get the following receipt. This contains the IR Mark (top left) and is your proof of filing. You can print this receipt for your records or save it as a PDF. To do this, click on Print this FBI receipt. NOTE: You'll also receive...
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18 Apr, 2023
Views: 5686
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What is a partnership return or SA800?
Partnership return (SA800) The SA800 is the partnership ‘statement’ that the nominated partner completes to declare: the income sources of the partnership how they are divided amongst the individual partners. It should contain: the Unique Taxpayer Reference (UTR) of the...
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25 Jul, 2023
Views: 5087
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1046 - I am an agent trying to file a client’s tax return
As an agent, if you have recently made a submission for another client, for the same tax return type, the likely cause is going to be the UTR entered on the return. We would recommend ensuring that you have a HMRC letter with the UTR present to verify that this is correct and has been entered...
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29 Jun, 2021
Views: 4487
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I've received a letter from HMRC stating that I've submitted an amended return but no original has been received – what do I do?
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...
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15 Jun, 2016
Views: 4439
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