CT600 preparation
Preparing the company return from the agreed accounts and supporting tax information.
Corporation Tax in Harrow and Ruislip
Corporation Tax with a clear calculation and filing plan.
Practical corporation tax support from our Ruislip base, with the work and fees agreed around your needs.
The Service
What is corporation tax?
Corporation Tax is a tax on company profits, calculated using tax rules rather than simply applying a rate to the profit shown in the accounts. A Company Tax Return normally includes the CT600, accounts and a tax computation. Angel Accountancy helps limited companies organise those documents and understand the tax due.
Who can benefit?
This service is for trading limited companies, companies preparing a first tax return, and directors reviewing losses, capital expenditure or related companies. Tell us if the business has investments, overseas transactions, a group structure or an HMRC enquiry, as those facts may change the work required.
Discuss Your Requirements
What Support Can Include
The work behind your Company Tax Return.
The services below can form part of an agreed engagement. We confirm the work, responsibilities and fees before starting.
Tax computation
Reconciling accounting profit to taxable profit, including relevant adjustments and reliefs.
Capital expenditure review
Considering the appropriate treatment of qualifying assets and the evidence needed for allowances.
Loss position review
Reviewing available company losses and discussing the relevant restrictions and claims.
Payment planning
Explaining the calculated liability and payment timetable, including whether instalment rules need consideration.
Director review and submission
Presenting the return for approval and completing the agreed filing through suitable software.
A Closer Look
Understand the calculation behind the return.
Accounting profit and taxable profit
The profit in your annual accounts is the starting point for the tax computation. Some recorded costs require adjustment, while qualifying capital allowances or losses may change the amount subject to tax. Director transactions, entertaining costs, asset sales and non-trading income can need particular attention. Keeping the accounts and tax computation consistent makes it easier to explain how the final liability was reached.
Current Corporation Tax rates
For ordinary non-ring-fence profits in the year beginning 1 April 2026, the small profits rate is 19% and the main rate is 25%. The usual profit limits are £50,000 and £250,000, with marginal relief potentially available between them. Those limits are reduced for short periods and associated companies. Some companies do not qualify for the small profits rate, so the headline rates alone are not enough to determine a liability.
Payment and return deadlines are different
For a company outside the instalment-payment rules, Corporation Tax is normally due nine months and one day after the end of its accounting period. The Company Tax Return is normally due within 12 months. A company may therefore need to pay before its return is filed. Larger companies can have earlier instalment deadlines. First accounting periods and changes in year end require a separate check.
Evidence for reliefs and unusual transactions
Keep purchase invoices and finance documents for equipment, and retain a clear explanation of any transactions outside normal trading. R&D relief is not available simply because a business has developed a product or software. The scientific or technological advance, uncertainty, qualifying costs and procedural requirements all need assessment. We discuss the relevant work and any specialist support before assuming a claim is appropriate.
Getting Ready
What to bring to your first discussion
Bring approved or draft accounts, the trial balance, previous CT600 returns, tax computations, asset purchases and disposals, loan agreements, ownership details and information about associated companies. Include any losses carried forward, HMRC notices and records supporting potential relief claims.
- Approved or draft accounts and trial balance
- Previous CT600 returns and computations
- Asset purchases, disposals and finance documents
- Ownership, associated companies and relevant losses
How We Work
From accounts to an approved tax return.
Establish the period
We check trading dates, accounting periods, earlier returns and the accounts being used.
Calculate and query
We review expenses, assets, losses and significant transactions and raise questions where evidence is needed.
Approve and submit
We explain the result, obtain approval and submit the agreed return, keeping payment responsibilities clear.
Accounting profit is the starting point. The tax computation adjusts it for relevant tax rules, reliefs and losses to arrive at taxable profits and the liability.
They can. The profit limits for the small profits rate and marginal relief are reduced where associated companies exist. Control and the applicable exceptions need to be reviewed.
No Corporation Tax accounting period can be longer than 12 months. A first set of accounts or changed year end can therefore require two Company Tax Returns.
No. Eligibility depends on the qualifying scientific or technological work, the expenditure and the rules for the relevant scheme. Development spending alone does not establish entitlement.
The company remains responsible for payment. We explain the liability and payment date as part of the agreed work; filing a CT600 does not itself pay the tax.