Tax library · November 2, 2026

Company Accounts and Corporation Tax Returns: Understanding the Difference

A company can file annual accounts at Companies House and still have an outstanding tax return. It can also submit a Company Tax Return without having completed every Companies House responsibility. These are connected reporting tasks, but they are not interchangeable. Understanding which document goes where prevents a successful submission to one organisation from creating false confidence about the other.

This guide follows the practical workflow from bookkeeping to accounts, tax adjustments, submission, and payment. It focuses on how the pieces fit together for a UK private limited company, rather than suggesting that every company qualifies for the same accounting or filing exemptions.

Start with one set of reliable accounting records

The underlying records should explain the company’s income, expenses, assets, liabilities, and transactions with directors or shareholders. Reconcile bank accounts and payment platforms, but do not assume that a bank balance equals profit. Customers may owe money, bills may remain unpaid, and equipment may continue to have a value after purchase. A preparer needs these facts to produce coherent accounts rather than a list of cash movements.

Maintain a year-end handover schedule for outstanding invoices, supplier balances, stock, borrowing, fixed assets, and unusual transactions. Identify personal spending through the company and money introduced by directors. Those entries should not disappear because they are awkward to classify. They may affect the balance sheet, related-party disclosures, or tax review, and the supporting explanation belongs in the file before the accounts are approved.

What the annual accounts are intended to show

Annual accounts report the company’s financial position and performance under the applicable accounting framework. Their content and the version filed publicly depend on the company’s circumstances and the rules in force. A reduced public filing does not mean the company has no need for fuller accounting information for members, lenders, HMRC, or management. Check eligibility instead of choosing the shortest set solely because software makes it available.

The official accounts and returns overview explains that accounts and a Company Tax Return are separate year-end tasks. Ask your accountant which accounts will be prepared, who must approve them, and which version will be filed at Companies House. Keep the approved version identifiable so a later adjustment is not made to a different draft without an explanation.

What makes up a Company Tax Return

A Company Tax Return is more than a CT600 cover form. HMRC’s return obligations guidance identifies the form, applicable supplementary pages, company accounts, and tax computations as components of the return. The tax computation explains how the tax result is derived from the accounting figures. Missing supporting components can therefore be a substantive issue, not just an untidy presentation.

Check the company name, UTR, accounting period, and supplementary requirements. An ordinary trading company and a company with specialised activities or transactions may not need the same sections. If HMRC has issued a notice to deliver a return, address it rather than assuming a nil bank balance or dormant Companies House filing automatically cancels the notice. Any claim that a return is unnecessary needs to be checked through the proper process.

Why accounting profit and taxable profit can differ

Accounts and tax rules serve different purposes. Some costs in the accounts may not be deductible for tax, some deductions may arise through a separate allowance mechanism, and timing differences may need adjustment. The tax computation should make these changes understandable. Ask for a clear bridge from accounting profit to the figure used in the return rather than expecting the two totals always to match.

For example, a piece of equipment may be reflected in the accounts through depreciation while its tax treatment is considered separately. A personal expense paid by the company also needs more analysis than labelling it office costs. The correct adjustments depend on the facts and law; do not copy a percentage from an unrelated company. Keep invoices, asset-use details, and the adviser’s explanation behind material adjustments so the return can be reviewed later.

Keep the filing and payment calendars separate

The standard private-company deadlines commonly differ: the annual accounts filing, Corporation Tax payment, and Company Tax Return filing are not one event. First accounts and unusual periods can need additional care. Check the current official deadlines and your company’s actual records. If instalment payment rules or another special circumstance applies, the ordinary payment timetable may not be the right one.

Use a calendar with separate lines for the organisation, period, document or payment, responsible person, and completion evidence. A reminder marked company renewal is too vague to control three obligations. Confirm who will calculate the payment early enough to meet its due date, even if the return will be filed later. Waiting for the last filing date to consider payment can create an avoidable cash and compliance problem.

Use the current submission route

The former HMRC online service for filing company accounts and a Company Tax Return closed on 31 March 2026. As reviewed for this article, HMRC’s return obligations guidance says proprietary third-party software is required for the electronic return and that accounts and computations are submitted in iXBRL, subject to limited online-filing exemptions. Do not plan a filing around an old tutorial for the closed service.

Companies House filing arrangements must be checked separately. Its accounts filing guidance describes the currently available routes and future changes. The existence of a Companies House online option does not recreate the closed joint HMRC service. Ask the software provider or adviser exactly which submission the product supports and what acknowledgment will prove each filing has reached the intended organisation.

A hypothetical company-year-end example

Suppose Northfield Studio Ltd has finished a year of trading. Its bookkeeping report shows sales, expenses, a computer purchase, and several director transactions. The director receives a message saying the Companies House accounts have been accepted and assumes the tax work is complete. In fact, the accountant is still waiting for information about the equipment and a payment made to the director before finalising the tax computation.

The director creates a completion tracker. One line records approved annual accounts and the Companies House acknowledgment. A second covers the CT600 package, including final accounts, computations, applicable supplementary pages, approval, and HMRC acknowledgment. A third records the payment calculation and payment confirmation. This makes the unfinished tax work visible without treating the accepted accounts as a failure or assuming all documents share the same deadline.

After the missing information is reviewed, the accountant explains why the taxable profit differs from accounting profit. The director approves the final return package and arranges the payment using the verified company reference. The example does not prescribe the adjustments or the liability; those depend on the transaction details. It demonstrates a control process in which each task has its own evidence and no submission is presumed complete because a related task succeeded.

Approve figures before an agent submits them

Hiring an accountant does not remove directors’ responsibilities for the company. Read the accounts, ask about significant judgments, and provide complete information. Where an agent prepares or submits a return, agree how the company will review and confirm the information. A hurried email saying go ahead is less useful than approval tied to a clearly dated final version and an explanation of material outstanding issues.

Check that director and shareholder balances agree with your understanding. A profitable year can still have limited cash, and a payment to a shareholder can have consequences outside the company’s own tax return. Identify those questions before treating all available cash as distributable. Keep the decisions and supporting records together so another preparer can follow what happened if the company changes advisers next year.

Resolve rejection, correction and record issues

A software validation result or saved draft is not necessarily an accepted filing. Retain the submission response and investigate any rejection promptly. Similarly, an HMRC acknowledgment confirms receipt, not agreement with every figure. If an error is discovered later, identify whether it affects the accounts, tax computation, CT600, payment, or more than one component, and obtain advice on the appropriate correction route.

Keep the records after the year-end work is finished. Do not delete the working papers simply because the public filing can be downloaded again: the public accounts may not contain the information needed to explain the tax calculation. Agree who holds invoices, ledgers, approval records, and software exports, and make sure the company can retrieve them if an adviser or software subscription changes.

Questions directors commonly ask

Does a Companies House confirmation statement replace accounts?

No. The confirmation statement is a different company-law filing. Accounts and the Company Tax Return need their own review and completion evidence. A calendar should identify each task by its proper name rather than grouping them under renewal.

Can I pay Corporation Tax when I file the return?

Do not assume the two deadlines coincide. Check the payment timetable applying to your company and arrange the calculation in time. A later return-filing date does not automatically extend the payment due date.

What should I ask an adviser to deliver?

Request a scope showing the accounts, tax return components, submission responsibilities, and payment advice included. If you need help organising that year-end handover, contact Litmus with the company’s period end and a summary of the records available.