Company accounts, tax computation and CT600
Corporation Tax accountant in Cardiff
We prepare company accounts, Corporation Tax computations and CT600 returns from reconciled records for owner-managed and small companies.
Company year-end work
What our Corporation Tax service includes
The accounts, tax computation and CT600 are prepared as one connected file, while Companies House and HMRC remain separate filing obligations.
Period and filing review
We confirm the accounts year, Corporation Tax accounting period, notices issued and each filing and payment date.
Accounts and balance-sheet checks
Bank, debtors, creditors, payroll, VAT, fixed assets, loans and reserves are reconciled before tax is calculated.
Tax computation
Accounting profit is adjusted for disallowable items, capital allowances, losses, gains and relevant company reliefs.
Rate and associated-company review
Profit limits, short periods, distributions and companies under common control are considered when the rate is determined.
CT600 and supporting documents
The return is filed with the required accounts, computation and any applicable supplementary pages.
Approval and payment information
You review the accounts and tax figures before filing and receive the amount, reference and due-date information.
From accounts to tax
Corporation Tax is calculated from taxable profit
The profit shown in the accounts is the starting point. Client entertaining, depreciation, private or non-business costs and other disallowable items may be added back, while capital allowances can replace accounting depreciation for qualifying assets.
Trading losses, chargeable gains, property income, loan relationships, pension contributions and research or creative claims require their own rules. The computation explains each adjustment rather than applying a rate to the accounts figure.
Rate review
Small profits rate, main rate and marginal relief
The current small profits rate is 19% for qualifying profits at or below £50,000 and the main rate is 25% above £250,000, with marginal relief potentially applying between those limits.
The limits are reduced for short accounting periods and divided by the number of associated companies. A second company under common control can therefore change the effective rate even when it made little or no profit.
Check HMRC’s current Corporation Tax rates and marginal relief rules.
Director transactions must agree
Salary, dividends, expenses, benefits and director loan balances affect the accounts, tax return and often the director’s personal return. They should be reviewed together before final approval.
Separate obligations
Corporation Tax payment comes before the CT600 filing deadline
The exact dates follow the company’s accounting period and status. Large companies can have different payment arrangements.
Reconcile the year
Complete bookkeeping, payroll, VAT and balance-sheet records so tax can be calculated.
Companies House accounts
A private company normally files annual accounts nine months after its financial year end.
Pay Corporation Tax
The payment deadline for a small company generally arrives before the return filing date.
File the Company Tax Return
The CT600 filing deadline is normally twelve months after the Corporation Tax accounting period ends.
See the official Company Tax Return requirements.
Companies in Cardiff and South East Wales
The return should reflect how the company actually earns and extracts profit
Consultants, contractors, trades, property companies, agencies, hospitality businesses and online sellers can produce very different tax adjustments even at the same profit level.
We connect the bookkeeping to the commercial activity, then make sure payroll, VAT, dividends, asset purchases and director balances agree with the final accounts and CT600.
Records normally required
- complete bookkeeping and bank reconciliations;
- sales, purchase and expense records;
- payroll and VAT reports;
- fixed-asset purchases and disposals;
- loan, finance and director account details;
- earlier accounts and tax computations.
Connected tax work
Related services and calculations
These subjects remain separate pieces of work, but the underlying figures may need to agree.
Payroll for directors and staff
Connect salary, PAYE and employer costs to the accounts.
Open this page →VAT returns
Reconcile turnover, purchases and the VAT control account.
Open this page →Salary versus dividend calculator
Compare an indicative director remuneration position.
Open this page →Director Self Assessment
Report salary, dividends, benefits and other personal income.
Open this page →Clear starting fee
Scope and price are agreed before work begins
Micro-company accounts and CT600 start at £700 plus VAT; small-company accounts and CT600 at £1,200. A Corporation Tax return and computation only starts at £750, subject to complete approved accounts.
Common questions
Questions about corporation tax return and company accounts preparation
The answer can change with the period, records and connected transactions. These are the usual starting points.
Must a company file a CT600 when it made a loss?
Yes, when HMRC has issued a notice to deliver a Company Tax Return, the company normally files even if it made a loss or has no tax to pay.
Are Companies House accounts and the CT600 the same filing?
No. They are separate obligations with different recipients and deadlines, although the accounts submitted with the CT600 must agree with the company records and tax computation.
Can company expenses be claimed because the director paid them personally?
Potentially, if the cost was incurred wholly for the company’s business and is properly evidenced and recorded through the director account. The payment method alone does not decide deductibility.
Does the service include the director’s Self Assessment return?
Not automatically. The company work and personal return are separately scoped, but salary, dividends, benefits and director loans are kept consistent across both.
Can you prepare a late Company Tax Return?
Yes. We first establish the periods, available records, HMRC notices, estimated assessments and penalties, then agree the order in which missing filings should be completed.