Company Tax Returns and CT600
Preparation of your CT600, supporting tax computation and the information required from your company accounts.
CT600 and Company Tax Return Support
Corporation Tax Accountants in Birmingham
Corporation Tax returns, CT600 filing, tax computations and annual accounts support for limited companies from our Hall Green office.
Fixed Fees
Free Initial Consultation
Qualified Accountants and Tax Advisers
What We Handle
Accounts and Corporation Tax kept in step
- Annual accounts and year-end figures
- Tax adjustments and Corporation Tax computation
- CT600 preparation and commercial software filing
- Payment and filing deadline guidance
Corporation Tax Returns for Birmingham Companies
Gondal Accountancy prepares Company Tax Returns for limited companies in Birmingham and across the UK. We review the records behind your accounts, calculate taxable profits, explain the amount due and submit the approved CT600 to HMRC.
Your annual accounts and Corporation Tax return are closely connected. Having both prepared together helps ensure the figures submitted to Companies House and HMRC are consistent. Learn more about our year-end accounts service or our wider support for limited companies in Birmingham.
Get a Fixed-Fee QuoteCorporation Tax Services
Practical support covering the accounts, calculations, filing and planning behind your company’s Corporation Tax position.
Corporation Tax Calculations
A clear calculation based on taxable profits, allowable business expenses, capital allowances and relevant reliefs.
Annual Accounts Support
Year-end accounts prepared alongside the Corporation Tax return so the figures submitted to Companies House and HMRC agree.
Marginal Relief Calculations
Review of the applicable profit thresholds, including adjustments for associated companies and short accounting periods.
HMRC Software Filing
Online submission of the Company Tax Return using commercial software after you have reviewed and approved the figures.
Tax Planning and Deadlines
Practical advice before the year end, with key payment and filing dates explained clearly and tracked throughout the process.
Current Corporation Tax Rates
The standard rates below apply to non-ring-fence company profits. The £50,000 and £250,000 thresholds are reduced for short accounting periods and according to the number of associated companies.
19%
Small Profits Rate
The standard rate for companies with profits of £50,000 or less.
Marginal Relief
Profits Between £50,000 and £250,000
The main rate may be reduced by Marginal Relief, producing a gradual increase in the effective rate.
25%
Main Rate
The standard rate for companies with profits above £250,000.
Check the current Corporation Tax rates and reliefs on GOV.UK.
Corporation Tax Payment and Filing Deadlines
The payment deadline normally arrives before the Company Tax Return filing deadline, so the tax calculation should be prepared well in advance.
Pay Corporation Tax
Usually 9 months and 1 day
Companies with taxable profits up to £1.5 million normally pay Corporation Tax 9 months and 1 day after the end of the accounting period.
File the Company Tax Return
Usually within 12 months
The CT600 and supporting information are normally due 12 months after the end of the accounting period covered by the return.
See the official Company Tax Return deadlines on GOV.UK. Different rules can apply to larger companies paying by instalments.
What Is Included in a Company Tax Return?
A Company Tax Return reports the company’s taxable profits or losses to HMRC. The calculation starts with the accounts and then applies the relevant tax adjustments, allowances and reliefs.
Since 1 April 2026, Company Tax Returns should generally be filed using commercial software. We prepare the required documents, explain the calculation and submit the approved return electronically.
The filing normally includes:
- Company accounts in the required format
- CT600 Company Tax Return
- Corporation Tax computation
- Relevant supplementary pages and claims
- Review and approval before submission to HMRC
Read HMRC’s guidance on the commercial software filing requirement.
Corporation Tax Support for Limited Companies
Corporation Tax becomes more involved when profits rise, records are incomplete, reliefs may be available or the company is connected with associated companies.
We help directors understand the figures, meet the correct deadlines and keep their annual accounts and tax return consistent.
We can help with:
- New limited companies filing a Company Tax Return for the first time
- Owner-managed and small companies needing annual accounts and CT600 support
- Companies approaching their Corporation Tax payment or filing deadline
- Businesses with incomplete records that need bookkeeping brought up to date
- Companies that may qualify for Marginal Relief, capital allowances or other reliefs
- Directors who want to understand their company’s tax calculation before it is filed
Our Corporation Tax Return Process
A straightforward process from organised records to an approved Company Tax Return.
01
Review Your Records
We review your bookkeeping, bank records, invoices, expenses, payroll and other relevant information.
02
Prepare the Accounts and Tax Calculation
We prepare the relevant year-end figures and calculate taxable profits, adjustments, allowances and reliefs.
03
Explain the Figures
You receive the completed figures and Corporation Tax liability for review, with any questions explained clearly.
04
File the CT600 with HMRC
Once approved, the Company Tax Return and supporting documents are submitted using commercial software.
Related Accounting and Tax Support
Corporation Tax works best when the underlying bookkeeping, annual accounts and business tax planning are handled together.
Limited Company Accountants
Ongoing accounting and tax support for company directors and owner-managed businesses.
Explore our limited company accounting supportYear-End Accounts
Annual and statutory accounts prepared for Companies House and Corporation Tax purposes.
Learn about year-end accounts preparationBookkeeping Services
Regular or catch-up bookkeeping to provide accurate records for accounts and tax returns.
See our Birmingham bookkeeping servicesBusiness Tax Planning
Forward-looking advice on business tax, allowances, reliefs and company decisions.
Read about business tax planning
Local Birmingham Accountants
Corporation Tax Advice from Our Hall Green Office
Gondal Accountancy is based at 1126A Stratford Road, Hall Green, Birmingham, B28 8AE. We work with local companies across Birmingham and the West Midlands, as well as businesses elsewhere in the UK through secure digital records and remote consultations.
Our team includes a Chartered Accountant and a Chartered Tax Adviser. Fees are agreed before work begins, and your first consultation is free.
Need Help with a Company Tax Return?
Speak to our Birmingham Corporation Tax accountants about your CT600, annual accounts, tax calculation and filing deadlines.
Book a Free ConsultationCorporation Tax FAQs
A Corporation Tax return, commonly called a Company Tax Return or CT600, reports a company’s taxable profits, tax calculation, reliefs and other relevant information to HMRC. It is normally supported by company accounts and a tax computation.
A Company Tax Return is normally due 12 months after the end of the accounting period it covers. A late return can result in an HMRC penalty.
For a company with taxable profits of up to £1.5 million, Corporation Tax is normally due 9 months and 1 day after the end of the accounting period. Larger companies may have to pay by instalments.
For standard non-ring-fence profits, the small profits rate is 19% for profits of £50,000 or less and the main rate is 25% for profits above £250,000. Marginal Relief may apply between those limits. The thresholds are reduced for short accounting periods and according to the number of associated companies.
Yes. We can prepare the relevant annual accounts, Corporation Tax computation and CT600 together so the figures are consistent before submission to Companies House and HMRC.
You may still need to submit a Company Tax Return if HMRC has issued a notice requiring one, even where the company has made a loss or has no Corporation Tax to pay. Different rules apply when a company is dormant.
HMRC’s joint online filing service closed on 31 March 2026. From 1 April 2026, Company Tax Returns should be submitted to HMRC using suitable commercial software, except in limited circumstances where a paper return is permitted.
The cost depends on the company’s turnover, record quality, transaction volume and whether annual accounts, bookkeeping or tax planning are also required. We provide a fixed-fee quote before work begins, and the initial consultation is free.
Last reviewed: 24 August 2026
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