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How to create a CT600 from an Accounting Period
When creating a period for a CT600, you have the option of specifying the period manually or using the existing Accounting Period. To use the Accounting Period dates: Open Practice Manager. Right-click on the client. Select Open in Tax Return Production. Click on New Return. Change the...
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21 Mar, 2024
Views: 1468
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How to adjust self-employment profits for accounting periods not aligned with the tax year (from 2024/25 onwards)
When processing the information for the 2024/25 tax year, the Basis Period Reform will have already taken place. If you are unfamiliar with the rules surrounding this, it is recommended that you review this HMRC webpage for further information. If for any reason, a self employed individual has...
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03 Jun, 2025
Views: 1460
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Why aren't the IRmark and time stamp appearing when I print a tax return?
If the IRmark and time stamp are on the top of each page, and on the pdf preview but don't appear when you print your return, check your printer settings: Go to the heading Page Sizing & Handling. Click on Fit. Click on Fit to printable area or Shrink to fit (or similar). Print document. ...
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24 Mar, 2022
Views: 1449
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How do I remove text above box 19 in Additional Information?
If you import your tax return from the previous year, you might see imported text above box 19 of the Additional Information section. This text often relates to data contained within a wizard such as losses, pensions and so on. If this data is not required in the current year, you’ll need to...
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13 Apr, 2022
Views: 1400
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Why I am getting a message regarding unallocated finance costs brought forward ?
If you have several instances of foreign property income for which there are previous unused finance costs, you may have to manually enter the brought forward finance costs for those properties. You will receive the following TaxCalc message: In the previous tax year, there were unused...
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24 Mar, 2020
Views: 1397
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R&D Tax Relief Claims - additional forms required from August 2023 onwards
Information required by HMRC before submitting claims for all R&D tax relief 1. For accounting periods beginning on or after 1 April 2023, you should check if you need to submit a claim notification form to notify HMRC in advance of your claim. A claim notification form should be submitted...
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21 Sep, 2023
Views: 1382
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How are boxes 330 and 380, for the financial year, populated on the CT600?
This article explains how boxes 330 and 380 are populated in the Corporation Tax Return. Boxes 330 and 380 refer to the financial years and are located within the Corporation Tax Chargeable page. The financial year for HMRC corporation tax purposes (in terms of rate and other changes) runs from...
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26 Mar, 2026
Views: 1378
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How to complete the entries for notice of consent (CT600C) using V2 Form
This article relates to V2 form of 2006 version of CT600. For the version 3 form, please see the link to 'How to complete the entries of consent V3 2015 form'. If you are completing the group and consortium pages to either claim or surrender losses for group relief, you may have to add a notice...
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07 Jun, 2023
Views: 1374
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R&D SME payable tax credit - calculation when periods straddle 1 April 2023
From 1 April 2023, the rate used for calculating the payable tax credit reduced from 14.5% to 10% for the R&D SME scheme. HMRC have issued guidance within the Research and Development manual (CIRD90500) on how to calculate the total payable tax credit when the accounting periods straddle 1...
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14 Nov, 2024
Views: 1374
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You have attached iXBRL Accounts to this return but there appears to be one or more areas where the content is 'malformed' (not correct)
If you receive this error message it means that either the downloaded file is corrupt or it contains special characters that HMRC's systems can't read. Corrupt file If you opened the downloaded file then used File > Save As, it might be corrupt. The correct way to save a downloaded file...
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31 Mar, 2017
Views: 1352
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I cannot delete a CT600 return from TaxCalc
In certain instances, customers have reported that they are having difficulties in deleting a CT return from the TaxCalc application. This is specifically in instances where users are on the practice interface and use our Accounts Production module too. We are looking to input additional...
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22 Oct, 2020
Views: 1348
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Why is the loss figure on my return shown without brackets?
If your return has one box for profit and another for loss, the loss figure will appear without brackets. Brackets are only used to denote a negative figure when the same box is used for profit and loss.
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20 Aug, 2015
Views: 1316
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Can I still use separate credentials for each client when filing online?
You can still use separate filing credentials when filing online. You'll have two options when you file the return: Manually type in the credentials that you use to log into the HMRC website – this can be any user ID and password that's registered to file online for this Unique Taxpayer...
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19 Nov, 2015
Views: 1303
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Why am i not receiving basic rate relief for finance costs?
The HMRC guidance document confirms below the factors which have to be applicable in order for the relief to be available. Individuals will be able to claim a basic rate tax reduction from their Income Tax liability on the portion of finance costs not deducted in calculating the profit. In...
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24 Mar, 2021
Views: 1264
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Error 3304: Original return already received for this period.
When filing a CT600 return online to HMRC, you may receive the below error: Please Note: this error could appear due to a delayed response on a recent submission. Please refer to our Knowledge Base article on: Delayed response / Return keeps polling when filing to HMRC for further details...
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17 Mar, 2026
Views: 1222
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