Companies are bound to submit a corporation tax return (CT600) to HMRC once a year within the duration of 12 months after completion of their accounting year. In case of failing a submission of return, companies can be penalized through fines and penalties. Therefore, all UK companies must fulfil this statutory obligation even if they made losses or doesn’t owe any corporation tax liability. The return has to be submitted in a specific format and it can be difficult without the help of Qualified Accountants in UK.