A Corporation Tax return (known as a CT600) is a compulsory form that UK limited companies must submit to HMRC to report their annual income, allowances, and expenses. This return is used to calculate your company's final Corporation Tax bill. Even if your business makes a loss or has no tax to pay, you must still file a return if you receive an official notice to deliver a Company Tax Return from HMRC. 🏢
The four steps to file your return
To successfully complete and submit your company's tax return, you will need to follow these steps in order:
Prepare your annual accounts: Compile your standard financial reports, including your balance sheet, profit and loss report, and any necessary accompanying notes. These can be viewed easily under your app's accounting tools.
Calculate your taxable profit: Work out your net income by subtracting your allowable business expenses and tax allowances. Note that your taxable profit might differ slightly from the accounting profit shown on your standard reports.
Complete your CT600 form: Fill out the formal corporate tax declaration details. This must be completed and submitted digitally using compatible accounting software. 🖥️
Submit to HMRC: File your return before the strict statutory deadline, which is exactly 12 months after the end of your company's accounting period.
First year vs future years: Tracking your accounting periods
The filing process looks slightly different in your company's first year of trading compared to subsequent years. This occurs because of how HMRC aligns your company's corporate accounting dates with standard tax rules.
Your first year of trading
When you first set up your business, your initial corporate accounting period typically covers slightly more than 12 months, running from your exact date of incorporation to the final day of that same month in the following year.
However, an official HMRC tax accounting period can never exceed a maximum of 12 months. Because of this structural rule, you may need to file two separate Corporation Tax returns and manage two independent tax payment deadlines in your first year.
For example: If your limited company was incorporated on 11 May, your official year-end date will be 31 May the following year (spanning 12 months and 3 weeks). To cover this, you would file one primary tax return for the first 12 months and a secondary, shorter return for the remaining 3 weeks. 📅
Subsequent years
From your second year onwards, your corporate bookkeeping becomes much more straightforward. Your company will revert to a standard schedule, meaning you will only need to file a single Corporation Tax return each year. This return will perfectly match your standard 12-month financial year (such as 1 June to 31 May).
You can learn more about managing your corporate deadlines and filing criteria by visiting the official GOV.UK Company Tax Return portal. ⚖️