Corporation Tax

Corporation Tax Services

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Corporate Tax Advisors

Expert Corporation Tax Services to Keep Your Business Compliant and TaxEfficient.

The CT600 form, a company tax return, is a legal necessity for every limited company based in the UK. It states your company’s amounts received and spent during a period and how corporation tax has been computed.

Corporation tax can take up a substantial part of your trading costs, with harsh penalties for businesses that fail to pay the right amounts. We can take away the administrative burden by providing a number of crucial support services.

Why Choose IBISS & CO for Corporation Tax Services?

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Over 50 years of experience in UK tax legislation.

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Specialists in cross-border and industry-specific tax planning (UAE-UK).

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Regulated by the ICAEW.

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Trusted by over 1,000 companies across the UK and UAE.

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Transparent pricing and tailored advice.

Our Full Range of
Corporation Tax Services

Corporation Tax Compliance

  • Preparing and submitting CT600 Corporation Tax Returns.
  • Statutory accounts preparation and iXBRL tagging.
  • Filing accounts with Companies House and HMRC.
  • Registering new companies for Corporation Tax.
IBISS & CO Corporation Tax Compliance services for businesses – expert guidance and filing support.

Strategic Corporation Tax Planning

  • Efficient profit extraction strategies.
  • Planning around director salary vs dividends.
  • Deferring or accelerating income to optimise tax.
  • Group tax planning and intra-group transfers.
IBISS & CO tax advisors in London leading strategic corporation tax planning session with business owners using charts and implementation models.

Claims for Reliefs and Allowances

  • R&D Tax Credits (Research & Development).
  • Capital Allowances for equipment and property.
  • Patent Box regime for intellectual property.
  • Loss reliefs (carry back, carry forward, group relief)
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International and Cross-Border Tax

  • UK-UAE Double Taxation Agreement advisory.
  • Structuring for overseas income and foreign branches.
  • Withholding tax optimisation.
  • Permanent establishment risk assessments.
IBISS & CO advisors in Dubai and UK engaged in international tax planning near waterfront skyline, symbolizing cross-border expertise.

Business Transactions & Exit Tax Planning

  • Tax due diligence for buyers and sellers.
  • Share and asset disposal planning.
  • Entrepreneur Relief and Business Asset Disposal Relief
  • Post sale tax efficiency planning
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HMRC Enquiries and Disputes

  • Handling Corporation Tax investigations.
  • Voluntary disclosures to HMRC.
  • Representation in appeals and penalty mitigation.
  • Reviewing and correcting past CT600 returns.
IBISS & CO advisors in London resolving HMRC enquiries and disputes, showcasing legal expertise with compliance tools and settlement discussions.

Next Step

Please contact us if you need further corporation tax advice, have any questions about our Corporation tax services, or would like a free consultation or a fixed quote.

Common Corporation
Tax Mistakes to Avoid

Even small errors can lead to costly penalties or missed tax savings. Here are common pitfalls businesses make with Corporation Tax:

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Late or missed CT600 filing deadlines, resulting in automatic HMRC penalties and interest charges.

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Failing to keep adequate records of income, expenses, and allowances for accurate tax computations.

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Overlooking valuable tax reliefs like R&D credits or capital allowances that could reduce your tax bill.

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Incorrectly calculating director salaries vs dividends, leading to inefficient tax planning.

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Ignoring international tax treaties, causing unnecessary double taxation on overseas income.

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Assuming losses mean no filing is required — even loss-making companies must submit returns on time.

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Not seeking expert advice early, which risks errors and missed opportunities for tax efficiency.

IBISS & CO Tax Advisor In London

Why Acting Early Matters

Late or incorrect Corporation Tax returns can lead to HMRC penalties, interest, and increased scrutiny. Working with a qualified accountant ensures your company remains compliant, tax-efficient, and audit-ready.

Common Corporation
Tax Questions We Answer

To file your company tax return, you need to:

  • Sign up for HMRC services.
  • Open your company accounts & carry out your tax computations.
  • Complete the CT600 form.
  • You can also send your return through the Internet with the help of the HMRC’s website.

As much as a business organization wants to complete this task in-house, consulting an accountancy firm such as IBISS and Co is advised to ensure compliance and precise results.

If you still need to make your corporation tax payment on the due date, contact the HMRC as soon as possible. It is always possible to negotiate for a Time to Pay proposal, which enables you to make payments in installments depending on the agreed time.

Credits can be deducted for late submission, but the penalty may be forgiven if the client can provide a credible reason for late work. Nonetheless, HMRC is very particular about what can be considered a reasonable excuse; therefore, proof would be necessary.

For your accountancy needs and to give your business entity a legal touch in the United Kingdom with taxation laws, we at IBISS and Co. handle the following. The company tax return filing is another service for which one can seek help from our experienced team that will help your company file the tax return on time and will not let you pay a penalty. The goal remains to consult with you at every stage and offer individual recommendations for improving your organization’s tax situation and other beneficial financial solutions.

Late submissions for multiple periods attract more severe consequences, such as fines, a negative impact on the company’s image, and greater attention from HMRC. Proper filing should continue, and professional help should be sought so as not to suffer these effects.

Registering your company’s tax return on time is crucial in simplifying the financial status of the company as well as in clearing its credit status in the business market. 

IBISS and CO. is at your service to assist in solving such issues with professional consultation and services adapted to your company’s requirements. Call us today and find out how you can benefit from our services concerning the taxes of your company.

We’re not in the business of providing low quotes just to get your business for the first year and then raising the fees. We want you as a long term client who trusts us to do what we say we will do. We quote what we anticipate to be a fair fee for the value provided and would only anticipate normal inflationary increases if the work stays the same. Very occasionally there may be reasons why the amount of work involved exceeded what was expected but we would sit down and discuss these with you. In some cases, where it is clear exactly what work is involved we can guarantee the fee for more than one year.

 All we can say is that as accountants, you’d expect us to be a bit analytical, which is true. As such do you really think we would offer you something we couldn’t deliver that is backed up by our 100 risk free guarantee. Our clients are used to this level of service. You are also more than welcome to speak with some of our existing clients who have the experience of our service. See what our clients say.

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