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Step-by-step Guide

How do I complete the CT600 for a long period of accounts? (Practice users)

Article ID: 919
Last updated: 04 Jul, 2022

If your accounts cover a period of over 12 months, you'll need to complete the CT600 for two periods, as follows:

  1. Prepare the accounts for the full period and generate an XBRL version.
  2. Apportion the profit/loss into a 12-month period and the remaining days – using days that meet the HMRC guidelines.
  3. Create the first (12-month) period return in TaxCalc (see instructions below).
  4. Create the second (short) period return in TaxCalc (see instructions below).

How to create the first period return

When it comes to creating the CT600 return period, there are two methods that can be used. The manual method (which is presented by default) or the automatic method which uses the accounting period dates already generated in Accounts Production.

Manual creation:

  1. Open Practice Manager.
  2. Right-click on the client.
  3. Select Open in Tax Return Production.
  4. Click on New Return.
  5. Enter the 12-month period.
  6. Click on Create.
  7. Go to Accounts and Computations.
  8. Under I am attaching Accounts..., tick Relating to a different period.
  9. Enter the apportioned figures into Computations – or if you're using Accounts Production, go to Select & Import accounts to pro-rata the figures accordingly.
  10. Complete the rest of the return.
  11. Attach the XBRL accounts (for the full period).

Automatic creation:

  1. Open Practice Manager.
  2. Right-click on the client.
  3. Select Open in Tax Return Production.
  4. Click on New Return.
  5. Change the radio button from Create New Period to Use Accounting Period
  6. Select the accounting period in question
  7. Click Use
  8. Click Create
  9. Go to Accounts and Computations.
  10. Under I am attaching Accounts..., tick Relating to a different period.
  11. Enter the apportioned figures into Computations – or if you're using Accounts Production, go to Select & Import accounts to pro-rata the figures accordingly.
  12. Complete the rest of the return.
  13. Attach the XBRL accounts (for the full period).

How to create the second period return

Similarly to the above, there are two methods for the second period creation. 

Manual creation:

  1. Open Practice Manager.
  2. Right-click on the client.
  3. Select Open in Tax Return Production.
  4. Click on New Return.
  5. Change the End date to reflect the short period.
  6. Click on Create.
  7. Open the return.
  8. You MUST indicate to HMRC that accounts have already been sent.
  9. Go to Accounts and Computations.
  10. Under I am attaching Accounts..., untick both Relating to this period and Relating to a different period.
  11. Select Submitted with accompanying return… from the drop-down menu – you don't need to send the accounts again.
  12. Enter the apportioned figures into Computations – or if you're using Accounts Production, go to Select & Import accounts to pro-rata the figures accordingly.
  13. Complete the rest of the return.

Automatic creation:

  1. Open Practice Manager.
  2. Right-click on the client.
  3. Select Open in Tax Return Production.
  4. Click on New Return.
    1. If you used the automatic creation above, the new return period dates should be automatically displayed for you to Create 
      1. Open the return.
      2. You MUST indicate to HMRC that accounts have already been sent.
      3. Go to Accounts and Computations.
      4. Under I am attaching Accounts..., untick both Relating to this period and Relating to a different period.
      5. Select Submitted with accompanying return… from the drop-down menu – you don't need to send the accounts again.
      6. Enter the apportioned figures into Computations – or if you're using Accounts Production, go to Select & Import accounts to pro-rata the figures accordingly.
      7. Complete the rest of the return.
    2. If you manually input the period dates for the first period, you will need to change the End date to reflect the short period.
      1. Click on Create.
      2. Open the return.
      3. You MUST indicate to HMRC that accounts have already been sent.
      4. Go to Accounts and Computations.
      5. Under I am attaching Accounts..., untick both Relating to this period and Relating to a different period.
      6. Select Submitted with accompanying return… from the drop-down menu – you don't need to send the accounts again.
      7. Enter the apportioned figures into Computations – or if you're using Accounts Production, go to Select & Import accounts to pro-rata the figures accordingly.
      8. Complete the rest of the return.
Article ID: 919
Last updated: 04 Jul, 2022
Revision: 9
Views: 10410
This article was:  


Also listed in
folder Tax Return Production -> CT600 Corporation Tax Return