--- title: "CT600 Corporation Tax Return in Cardiff | TCK Accounting" description: "CT600 corporation tax return prepared and submitted to HMRC with clear computations, relief checks and payment guidance for owner-managed companies." canonical: "https://www.tckaccounting.co.uk/services/corporation-tax-return-preparation-ct600" --- ![Editorial illustration of an office desk with a computer showing a government website and organised paperwork, conveying a neutral update about tax guidance.](/_next/image?url=%2Fapi%2Fmedia%2Ffile%2Fhmrc-mtd-vat-update-hero.png%3Fv%3D1769183235735&w=1536&q=75&dpl=dpl_HkjxAMLz8SoKDEaYz6gDcGJLMf1v) Corporation tax (CT600) # Corporation Tax Return Preparation (CT600) [Book a free consultation](https://www.tckaccounting.co.uk/redirect-contact) 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. ## 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. [Book a free consultation](https://www.tckaccounting.co.uk/redirect-contact) ## Frequently Asked Questions What information do you need to prepare a CT600? Usually we need your year-end accounts, bookkeeping records, and details of any major purchases, loans, or unusual income or costs. If you use accounting software, access to the ledger reports speeds things up. When is a corporation tax return due? The CT600 is generally due 12 months after the end of your accounting period. The corporation tax payment is usually due earlier, typically 9 months and 1 day after the period end. Do you also file the iXBRL accounts with the CT600? HMRC normally requires iXBRL tagged accounts and computations to be submitted alongside the CT600. If your accounts are being prepared as part of your year-end work, we will align the filings so the numbers match and the submission is complete. Can you help reduce my corporation tax bill? We will claim relevant reliefs and ensure allowable expenses and capital allowances are treated correctly. If further tax planning opportunities exist, we can discuss them separately so you can act before the year ends. What happens if HMRC queries the return? If HMRC raises a question about the figures submitted, we can help you respond and provide supporting explanations. The exact scope depends on the nature of the query, but the aim is to resolve it quickly and clearly. [Book a free consultation](https://www.tckaccounting.co.uk/redirect-contact) ## Related Services Complete your experience with these services - HMRC Corporation Tax Compliance Support [View](/services/hmrc-corporation-tax-compliance-support) - Corporation Tax Records & Schedules Preparation [View](/services/corporation-tax-records-and-schedules-preparation) - Corporation Tax Payment Planning [View](/services/corporation-tax-payment-planning) - Corporation Tax Deadline Management [View](/services/corporation-tax-deadline-management) Show more services - Corporation Tax Return Prepared With Annual Accounts [View](/services/corporation-tax-return-prepared-with-annual-accounts) - Taxable Profit Calculation (Corporation Tax) [View](/services/taxable-profit-calculation-corporation-tax) - Corporation Tax Online Filing [View](/services/corporation-tax-online-filing) - Corporation Tax Registration (UTR Support) [View](/services/corporation-tax-registration-utr-support) ## Related Blog Posts - [![A computer on a desk in a small business office setting, displaying accounting software.](/_next/image?url=%2Fapi%2Fmedia%2Ffile%2Fhmrc-vat-software-editorial-uk-small-business.png%3Fv%3D1769183233536&w=1536&q=75&dpl=dpl_HkjxAMLz8SoKDEaYz6gDcGJLMf1v) ### MTD for VAT Penalties: What HMRC Says About Filing Without Functional Compatible Software HMRC says it may charge a penalty of up to £400 for every VAT return filed without functional compatible software under MTD for VAT. Read more ](/blog/mtd-for-vat-penalties-what-hmrc-says-about-filing-without-functional-compatible-software)