CT600 Tax Return Filing in Letchworth Garden City — Prepare and File Your Company Tax Return with HMRC

A CT600 is the form used to submit a Company Tax Return to HMRC. It reports a company's Corporation Tax position for an accounting period, showing the income, gains and deductions that HMRC needs, together with the resulting Corporation Tax liability or the reasons why no tax is due. The CT600 is normally supported by a Corporation Tax computation and by the company's accounts, which are attached or submitted alongside as required. It is a tax document, not an accounts document, and it is filed with HMRC rather than with Companies House.

A company that is within the scope of Corporation Tax will generally need to notify HMRC that it is trading or receiving income and, where a return is required, complete a Company Tax Return. The requirement turns on the company's own circumstances rather than on its size, and HMRC may issue a notice to deliver a return. Micro-entity companies are not exempt simply because they prepare simpler statutory accounts — the micro-entity accounting framework affects the accounts, not the company's Corporation Tax obligations. Whether a return is needed, and whether any Corporation Tax is actually payable, depends on the company's activity and taxable position, so it is worth confirming your own position rather than assuming either way.

Yes, they are two separate filings with two separate purposes. Statutory accounts are prepared under an accounting framework and filed at Companies House as part of the company's public filing obligations. The CT600 is a tax return submitted to HMRC to report the company's Corporation Tax position. The figures in the two documents are closely related because the accounts often provide the starting point for the tax calculation, but they are not the same thing and the CT600 may include adjustments that never appear in the statutory accounts. Filing one does not discharge the obligation to file the other, and a Confirmation Statement or a VAT Return is a further, entirely separate filing.

They are related but distinct. The Corporation Tax computation is the working document that starts with the company's accounting profit and applies the necessary tax adjustments to arrive at taxable profit and the Corporation Tax liability. The CT600 is the return form on which those results are reported to HMRC. In practice the computation underpins the entries made in the CT600, which is why preparing the two together — rather than treating the return as a stand-alone form — tends to produce a more reliable result and a clearer audit trail.

Taxable profit usually begins with the accounting profit shown in the company's accounts for the period, and is then adjusted for tax purposes. Typical adjustments include adding back expenditure that is not allowable for Corporation Tax, deducting items that are taxable or relievable in a different way, and replacing depreciation with capital allowances where plant and machinery or other qualifying assets have been purchased. Other timing differences, such as certain provisions or accrued income, may also need attention. The result is the taxable profit on which Corporation Tax is calculated, and it will often differ from the accounting profit reported in the accounts. The exact adjustments depend on the company's transactions, so each computation is built from the underlying records.

No — filing and paying are separate obligations. Submitting the CT600 tells HMRC what the company's Corporation Tax position is; payment is a separate transaction that settles any liability due. A company can file a return showing no Corporation Tax payable, and equally a company can have a liability to pay that must be settled independently of when the return is submitted. Keeping the two tasks distinct helps avoid the common mistake of assuming that sending the return has also dealt with the payment, and it is worth checking both the filing deadline and the payment date that apply to your company's accounting period.

Yes. An accountant or tax agent can prepare the Company Tax Return and submit it to HMRC on the company's behalf, and many companies take that route because the computation and the filing formalities are easier to handle with professional support. To prepare a CT600 accurately, we typically need the company's accounting records for the period, the accounts themselves, details of income and expenditure, information on asset purchases and disposals, any earlier returns or computations, and confirmation of the accounting period being reported. We will also ask about anything unusual or one-off that may need specific tax treatment, so nothing material is overlooked before the return is submitted.

HMRC applies penalties and interest for returns that are filed late, and the amount charged generally increases the longer the return remains outstanding, with further charges possible if the return is still missing after a longer period. Interest can also accrue on any Corporation Tax that is paid late. The practical priority is to deal with the overdue return as quickly as possible and to bring any outstanding tax position up to date, rather than waiting for the situation to develop further. The exact charges depend on how late the filing and any payment are and on the company's own circumstances, and HMRC's own guidance sets out how they are applied.