Corporation Tax Return Preparation (CT600)
Corporation Tax Return Preparation (CT600) ensures your limited company’s taxable profit is calculated correctly and your return is filed with HMRC on time. You get a clear view of what is due, when it is due, and how the figures link back to your year-end accounts.
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What CT600 preparation covers
Your corporation tax return is more than a form. It needs a consistent story across your accounts, tax computation, and supporting submissions. This service typically includes:
- Reviewing your trial balance, bookkeeping, and year-end accounts for tax accuracy
- Preparing the corporation tax computation to arrive at taxable profit
- Checking common reliefs and adjustments (for example, allowable expenses and capital allowances)
- Producing and filing the CT600 with HMRC, with supporting iXBRL files where required
- Confirming key deadlines and the corporation tax payment date
- Answering HMRC follow-up queries related to the submitted return (where applicable)
When this service is most useful
This service is designed for owner-managed limited companies that want confidence their corporation tax position is correct without spending evenings interpreting HMRC guidance. It is especially relevant if:
- This is your first CT600 after incorporating
- Your profit has changed significantly and you want to avoid surprises
- You have purchased equipment or assets and need capital allowance treatment
- You pay yourself via salary and dividends and want the company tax position aligned
- You want clearer reporting so you can plan cashflow around tax payments
How the process works
You provide your accounting records and year-end accounts (or we agree the route to finalise them first). We then prepare the tax computation, sense-check key figures, and confirm what will be filed and what you will need to pay.
Once approved, we submit the CT600 to HMRC and share confirmation, along with a plain-English summary of the outcome and next steps.
After submission: clarity for payments and planning
After filing, you receive a clear breakdown of the corporation tax due and the payment deadline. If anything looks inefficient or inconsistent, you can use the figures to inform tax planning for the next accounting period, rather than waiting until the next year-end rush.
Frequently Asked Questions
What information do you need to prepare a CT600?
When is a corporation tax return due?
Do you also file the iXBRL accounts with the CT600?
Can you help reduce my corporation tax bill?
What happens if HMRC queries the return?
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