E-file a calculation in the U.K.
ONESOURCE Corporate Tax supports e-filing for your company's annual tax returns. You can file for one or multiple accounting periods. Submit the CT600 return, supplementary returns, accounts, and computations. You can also submit supporting documents in PDF format.
Enter the wizard for each action to complete e-filing. These actions include Validate, File, and Check Status (File).
Most XBRL tags are already applied in the computations. However, some sheets require you to apply tags after completion because they are more customized.
Use the tagging wizard to prepare for e-file
The Tagging Wizard automatically tags data items in your Income Statement and supporting analysis sheets. It uses XBRL tags based on their descriptions in the calculation. The Tagging Wizard compares the descriptions you use in your calculation to a dictionary.
This dictionary contains the most commonly used descriptions in that context. When the Tagging Wizard finds a match, it tags the data item. It uses the XBRL tag corresponding to its match in the XBRL data dictionary.
- Open your calculation.
- SelecteFile
, then Tagging Wizard. - SelectNexton the Welcome to theXBRL Tagging Wizardscreen.
- Select one of the following preferences:
- Add New Tags
- Tag All Items
- Add or Change Tags Only
- Remove All Wizard Tags
- SelectNext.
- Select the sheets you want to tag, then selectNext.
The Tagging Wizard provides a summary of the changes made.
- You can view the results of the Tagging Wizard in the calculation. Two sheets have been added for this purpose.
- Income and Expenses eFiling Analysis
- Income and Expenses eFiling Analysis - Not Tagged.
Use e-filing manager to e-file
- Open your calculation.
- SelecteFile
. - Select the filings you want to view, then selectNext.
noteThe list of filings displayed depends on the number of periods in your calculation. - SelectValidateon theActionstab.

- SelectNext. TheValidateoption performs offline validation.
- SelectRefresh Statusto update the status.
noteThis process takes a little time. SelectRefresh Statusagain to check for updates. - SelectExportto download the file if there are no errors in the data, and the E-Filing Status isPassed Validation.

- SelectView Errorsto view errors in the calculation when the E-Filing Status shows asFailed (Validation).

- SelectActionson theE-Filing Manger errorsscreen to view the error.
noteYou can also openExportsandView Errorsin theeFile
menu.
Send a test submission
The U.K. tax authorities provide an online validation as a test submission. This is for a more complete test, including if you have the correct e-filing credentials.
- Open E-Filing Manager and select the filing you want to view, then selectNext.
- SelectFileon theActionstab.
- Mark theTest in Livecheckbox, then selectNext.

- Enter theUser NameandPassword, then selectNext.noteThe username and password is unique to the taxpayer.
- Add documents as you're prompted based on your permissions, then selectNext.

- SelectRefresh Statusonce you send the calculation to E-Filing Manager successfully to update the status.The E-Filing Status changes toValidating (Waiting on HMRC) (Test in Live)orSuccess submission to the Test service.noteThis process takes a little time. SelectRefresh Statusagain to check for updates, or selectOKto exit E-Filing Manager and return later.
- To check the status, follow Step 1.
- SelectCheck Status (File), thenNext.The E-Filing Status changes to eitherSuccess submission to the Test serviceorFailed (Validation).
File a submission
- Open E-Filing Manager and select the filing you want to view, then selectNext.
- SelectFileon theActionstab.
- SelectNext, then proceed to file the form.
- Check status
- Open the E-Filing Manager, then select Filing.
- SelectNext, then selectCheck Status (File).
- SelectNextto view the status.noteThis follows the same process when you send a test submission.
XBRL tags
ONESOURCE Corporate Tax automatically tags any notes included in the calculation. However, HMRC has a limit on the number of notes you can tag.
The XBRL taxonomy divides the tags for a calculation into several broad functional areas. These include trading income, property income, or chargeable gains. Each of these areas is referred to as a hypercube. HMRC limits the number of tags in each hypercube to 40.
If you exceed 40 notes within a hypercube, ONESOURCE will automatically tag the first 40. It leaves the others untagged to ensure the calculation can successfully file to HMRC. For notes that aren't tagged, the system submits the note to HMRC as part of the HTML calculation.