Basic accounting period and client details can be accessed on the Client / Case Details tab.
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Go to Clients > Client List and find the required client.
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From the Corporate tax returns widget on the client dashboard, select the required return.
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Select the Client / Case Details tab.
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You can edit the Start date, End date, Case reference or Mailing address. Select Save changes.
If you need to change the accounting period within the accounts as well, you will need to follow the process outlined in Change the accounting period, to prevent duplication of returns and or accounts.