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SPECIALISTS IN CORPORATION TAX COMPLIANCE
HMRC Enquiry Support
Full CT600 preparation & submission
Your Obligations
Corporation Tax for Limited Companies
Every UK limited company must pay corporation tax on its taxable profits and file a Company Tax Return (CT600) with HMRC even if no tax is owed. Getting it wrong means penalties, interest, and potential HMRC enquiries. Our small company accountants are well-versed in navigating these exact compliance requirements.
At Barnett & Co, we handle the entire process: calculating your taxable profits, claiming all available reliefs and allowances, preparing your CT600, and submitting it electronically to HMRC. We make sure you're compliant and never pay more than you should. To ensure accurate calculations, we strongly recommend our ongoing bookkeeping support for your daily financial records.
Corporation Tax
Corporation tax returns for Crewe & Cheshire limited companies
At Barnett & Co, we handle the full process — from computing your tax liability to submitting tagged accounts — so you can focus on running your business.
We don't just complete the paperwork. We actively look for opportunities to reduce your corporation tax bill — claiming every capital allowance, reviewing whether you qualify for R&D tax credits, and planning dividends and director salaries to optimise your overall tax position.
What's included in our corporation tax service?
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Preparation of statutory accounts (profit & loss, balance sheet)
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CT600 corporation tax return preparation and iXBRL submission
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Calculation of corporation tax liability and payment deadlines
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Capital allowances and Annual Investment Allowance (AIA) claims
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R&D tax credit review and claims where applicable
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Director loan account and dividend planning advice
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Filing with both HMRC and Companies House
Corporation tax rates and deadlines
As of April 2023, the main corporation tax rate is 25% on profits over £250,000, with a small profits rate of 19% for profits under £50,000. A marginal relief applies between these thresholds. The CT600 must be filed within 12 months of your company's accounting period end, and tax must be paid within 9 months and 1 day of that date. We'll ensure you never miss a deadline.
R&D tax credits — are you claiming?
Many small businesses underestimate whether they qualify for R&D tax relief. If your company has invested in developing new products, processes, software or services — even if the project wasn't ultimately successful — you may be eligible. We review every client's activity and submit R&D claims where appropriate.
Why choose us
What makes our corporation tax returns service different
Full CT600 preparation
We handle everything from computing your liability to submitting tagged accounts to HMRC in the correct iXBRL format.
Proactive tax reduction
We don't just file — we actively look for allowances, credits and reliefs to legally reduce your corporation tax bill.
Deadline guaranteed
Every return filed on time, every year. We manage the Companies House and HMRC deadlines simultaneously so nothing slips.
Frequently asked questions
I am extremely satisfied with my accountant! The collaboration is always reliable, professional, and transparent. All of my questions are answered quickly and clearly, and I always feel very well advised. I especially appreciate the structured approach and the proactive support with tax-related matters. Thanks to their help, I have a much better overview of my finances and can fully focus on growing my business. Highly recommended for anyone looking for a competent and trustworthy accountant!
- Saskia & Dominik Krosta, Google