--- title: "Corporation Tax Deadlines Cardiff | TCK Accounting" description: "Stay on top of CT600 and payment deadlines with reminders, planning and filing support to reduce late penalties and improve cash flow." canonical: "https://www.tckaccounting.co.uk/services/corporation-tax-deadline-management" --- ![Person at desk with laptop and simple icons representing VAT setup elements in a neutral office scene.](/_next/image?url=%2Fapi%2Fmedia%2Ffile%2Fquickbooks-vat-setup-uk-hero.png%3Fv%3D1769183244062&w=1536&q=75&dpl=dpl_HkjxAMLz8SoKDEaYz6gDcGJLMf1v) Corporation tax (CT600) # Corporation Tax Deadline Management [Book a free consultation](https://www.tckaccounting.co.uk/redirect-contact) Corporation Tax Deadline Management keeps your limited company on track for HMRC submission and payment dates. You get a clear timetable, prompt reminders, and a structured process to prepare your figures, submit your return, and reduce the risk of late filing penalties. ## What corporation tax deadline management covers Corporation tax has more than one deadline, and they do not always align with Companies House dates. This service keeps everything planned, evidenced, and submitted on time. - Confirming your accounting period and the correct HMRC deadlines - Building a clear timetable for bookkeeping close, accounts finalisation, and return preparation - Proactive reminders so you know what is due and when - Estimating corporation tax in advance to support cash flow planning - Preparing the corporation tax computation and CT600 return - Submitting to HMRC and checking acknowledgements - Coordinating related deadlines, such as statutory accounts filing where relevant - Support with HMRC queries linked to the submission ### Who this service is most useful for This is a strong fit for owner-managed limited companies that want certainty and fewer last-minute scrambles. It is especially helpful if you are in your first year, have recently changed year end, are short on admin time, or have had previous late filings and want a tighter process. ### How the service is delivered You start with a quick review of your year end, past filings (if any), and what records are already in place. We then agree a timeline for closing the books, drafting accounts, estimating tax, and finalising the return. As deadlines approach, you will get clear requests for what is needed, what is still outstanding, and what will be filed next. ### What happens after submission Once filed, you get confirmation of submission and a clear note of the payment deadline and amount due. We also roll the timeline forward for the next period, so upcoming dates are already mapped out. If useful, we can highlight practical steps to improve record keeping and reduce future tax admin. [Book a free consultation](https://www.tckaccounting.co.uk/redirect-contact) ## Frequently Asked Questions What are the key corporation tax deadlines for a limited company? Most companies must pay corporation tax within 9 months and 1 day after the end of the accounting period, and file the CT600 within 12 months. Your Companies House accounts deadline can be different, so we plan both. Do you manage the CT600 filing as well as reminders? Yes. Deadline management includes building the timetable, preparing the corporation tax computation, and submitting the CT600 once your figures are finalised. You also get confirmation that the submission has been received. What do you need from me to keep deadlines on track? Mainly timely access to your bookkeeping records and any year-end documents such as bank statements, loan interest, and asset purchases. We will tell you exactly what is needed and by when, in plain English. Can you help if I am already late with corporation tax? Yes. We can assess what is overdue, prioritise what needs filing first, and help you submit as quickly as possible. We can also explain likely penalties and what to do next. How does this fit with annual accounts and bookkeeping? Corporation tax deadlines depend on accurate year-end figures, so bookkeeping and accounts are part of the timeline. We coordinate the close-down process so the accounts and CT600 are prepared from consistent numbers. [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 Return Prepared With Annual Accounts [View](/services/corporation-tax-return-prepared-with-annual-accounts) Show more services - 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) - Corporation Tax Return Preparation (CT600) [View](/services/corporation-tax-return-preparation-ct600) ## 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)