What Is a CT600?

It shows:

• Your company’s income
• Allowable business expenses
• Any reliefs or losses
• How much Corporation Tax is due (or if you’re due a refund)

Think of the CT600 as HMRC’s summary of your year:

"How much did the company make, what can you claim, and what tax is left to pay?"

When Do You Need to File a CT600?

You must usually file a CT600 if:

• You run a UK limited company (or certain other corporate bodies), and
• HMRC has sent you a “Notice to deliver a Company Tax Return.”

Key points:

• A CT600 covers your company’s accounting period (for example, 1st January to 31st December).
• The CT600 must be filed within 12 months of the end of that accounting period.
• Corporation Tax itself is normally due 9 months and 1 day after the end of the period.

If you ignore a notice from HMRC and don’t file, you can face:

• Automatic late filing penalties
• Growing fines the longer it’s left
• HMRC estimates of your tax bill (often higher than the real figure)

How Atex Business Solutions Handles Your CT600

At Atex Business Solutions, we make CT600 filing simple, accurate, and stress-free.

Here’s what our CT600 service includes:

1. We Review Your Accounts and Records
   We start with your company accounts, bank statements, sales records, and expenses.
   If you use software like Xero, we’ll connect to it and check everything is complete and tidy.
2. We Calculate Your Corporation Tax
   We:
   • Work out your taxable profit or loss
   • Apply the correct Corporation Tax rate
   • Check reliefs and allowances you can claim
   • Make sure you’re not paying more tax than you need to
3. We Prepare the CT600 Form
   
   Using HMRC-approved software, we:
   • Complete the CT600 Company Tax Return
   • Add all the required schedules (for example, capital allowances, loans to directors, losses)
   • Make sure everything matches your final accounts
4. We File the CT600 Online With HMRC
   
   Once you’ve approved the figures:
   • We submit the CT600 online through our agent portal
   • We confirm the Corporation Tax due and the payment deadline
   • We keep secure records in case HMRC ever asks questions later
5. We Explain Everything in Plain English
   
   No jargon, no drama.
   
   We’ll:
   • Explain your tax position in simple language
   • Tell you what to pay, when, and how
   • Answer your questions about losses, dividends, director’s loans, or future planning

What We Need From You

To complete your CT600 smoothly, we’ll usually ask for:

• Full access to your bookkeeping (for example, Xero, spreadsheets, or other software)
• Bank statements for the period
• Details of large purchases (machinery, vehicles, equipment)
• Information on director’s loans and dividends
• Any other income the company has received