─── Specialist Micro-Entity Accountants In The UK

CT600 Tax Return Filing in Isleworth – Prepare and File Your Company Tax Return with HMRC

If your company is based in Isleworth and needs to report its Corporation Tax position to HMRC, professional CT600 Tax Return Filing gives you a clear, structured route from your accounting records through to submission. We work with you to review the figures in your accounts, prepare the Corporation Tax computation, apply any necessary tax adjustments, and complete the CT600 Company Tax Return ready for filing with HMRC. It is important to understand that the CT600 is not the same as your statutory accounts: statutory accounts are prepared under an accounting framework and filed with Companies House, while the CT600 is the Company Tax Return submitted to HMRC to report taxable profits and the resulting Corporation Tax position. Because those two documents serve different purposes, the figures in each can differ, and the tax computation is where that difference is worked through. Our role is to make the process accurate, understandable and as convenient as possible, so you know what is being reported, why, and what happens next — with transparent, fixed-fee options available depending on the scope of work your company needs.

CT600 TAX RETURN FILING

(Turnover up to £100K)

£499.00

+vat

CT600 Return Preparation
Corporation Tax Computation
Tax Adjustment Review
Allowable Expenses Review
HMRC CT600 Filing
Filing Deadline Support

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Trusted by Micro-Entity Businesses Across the UK

From newly incorporated companies to established owner-managed businesses, our clients trust us to prepare their accounts accurately and handle their annual filing requirements.

      EXCELLENT  
   Based on 300 reviews 
    
 
 
 
   
 
 
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   Jamie Fletcher 
 
 
 
 Trustindex verifies that the original source of the review is Google. It was a pleasure working with Anum on our accounts. The whole process was swift and effortless, and it was one less thing to worry about. I'd highly recommend them.
  
 
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   Mansur Liman 
 
 
 
 Trustindex verifies that the original source of the review is Google. Accotax have been our accountants for many years now. We maintained them, because of their professionalism. In the last coiple of years, i have working with Imran, who has been very professional and helpful in guiding us through the whole process explaining and clarifying every aspect of it. Very prompt in responding to questions and patient with us even when we seem to be slow. I really enjoy working with him. Thank you
  
 
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   Muna Mohamoud 
 
 
 
 Trustindex verifies that the original source of the review is Google. I highly recommend Imran to anyone looking for a reliable and knowledgeable accountant. He helped me sort out a very complicated backlog of accounts and prepared my overdue tax returns with professionalism and attention to detail. Throughout the process, he was incredibly patient, took the time to answer all of my questions, and explained everything clearly. He guided me through each step and helped rectify issues that had built up over time, making what felt like an overwhelming situation much more manageable. I'm very pleased with the service I've received and truly appreciate his support. If you need help with your accounts or taxes, I would highly recommend Imran.
  
 
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   Sergey M 
 
 
 
 Trustindex verifies that the original source of the review is Google. I had a positive experience with Accotax. The work was completed promptly, my tax return was successfully filed, and I received a refund of overpaid tax. I found the cooperation efficient and helpful. Special thanks to Muhammad Saifullah for his assistance.
  
 
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   Ebba Qureshi 
 
 
 
 Trustindex verifies that the original source of the review is Google. Fabulous team at ACCOTAX - very efficient and good response time . Honest and professional with their work. I would highly recommend them even if you’re a young start up - or a large business they have it covered .
  
 
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   Mael Leboucher 
 
 
 
 Trustindex verifies that the original source of the review is Google. We worked with a few different accountants before finally settling with Accotax, and we’re really glad we did. Their team is great. Abdul is responsive and easy to reach whenever I have a question, which makes a big difference. They take the time to understand how our business works and what our needs are. They are very knowledgeable, and when they don’t have the answer straight away, they take the time to look into it and get back to us quickly. Anum, who looks after our account on a day-to-day basis, including reconciling invoices and preparing the annual accounts, is amazing. She is professional, efficient, and follows the processes we have put in place together. She's also very quickin getting back to us whenever needed. We’re very happy to work with her and hope to continue doing so for as long as possible. Overall, Accotax has made our accounting experience much smoother and easier. We see them as a long-term partner as our business continues to grow. I would 100% recommend them.
  
 
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   3rd Hub 
 
 
 
 Trustindex verifies that the original source of the review is Google. Imran provides a very dependable and straightforward accounting service. He is always responsive and professional when managing our accounts. Excellent support.
  
 
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   Martin Tyrrell 
 
 
 
 Trustindex verifies that the original source of the review is Google. I have really impressed to date with all dealings with Accotax highly enough. From day one, they've made what can often be a complicated and stressful part of running a business feel straightforward and hassle-free. A special mention has to go to Anum, who has been friendly, incredibly responsive, and genuinely cares about providing the best possible service. No question is ever too much trouble, and she consistently goes above and beyond to make sure everything is dealt with efficiently. I wouldn't hesitate to recommend you to anyone looking for an accountant they can genuinely trust.
  
 
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   Matthew Lyon 
 
 
 
 Trustindex verifies that the original source of the review is Google. Great speedy service and very personable. Anum dealt with my income certificate and did everything quickly and helped me out massively. Very happy with the service provided.

What Is a CT600, and How Does It Apply to Micro-Entity Companies in Isleworth?

There is no separate official “micro-entity CT600” form. The CT600 is simply the standard Company Tax Return that HMRC requires from companies that need to file one, regardless of size. A company that operates as a micro-entity — typically a smaller business that qualifies to prepare and file simpler accounts under a micro-entity accounting framework — may still have Corporation Tax obligations, and where HMRC requires a Company Tax Return, that company will need to submit a CT600 just like any other. The CT600 is separate from the statutory accounts filed with Companies House: the accounts present the company’s financial position under its chosen accounting framework, while the CT600 reports the company’s Corporation Tax position to HMRC. Your accounting records and accounts usually form the starting point for the Corporation Tax calculation, but taxable profit is not automatically the same as accounting profit. Corporation Tax calculations may require adjustments — for example, to add back certain disallowable expenses or to account for items treated differently for tax purposes — before taxable profit and any Corporation Tax liability are determined. Whether a micro-entity company owes Corporation Tax depends on its own circumstances and taxable position, and filing a CT600 is a separate obligation from paying any Corporation Tax that may be due. Our CT600 Tax Return Filing service in Isleworth helps micro-entity and small company directors work through these steps with clarity.

What a Complete CT600 Submission Includes

The CT600 Form

Company details, accounting period, turnover, profit and the tax calculation.

Tax Computations

A working showing how accounting profit is adjusted into taxable profit.

iXBRL Accounts

Your statutory micro-entity accounts, machine-tagged to HMRC's taxonomy.

Supporting Schedules

Capital allowances, losses, directors' loans and any claims or reliefs.

─── OUR CT600 SERVICE

What's Included in Our CT600 Preparation Service?

Our fixed-fee service covers everything a qualifying micro-entity company needs to complete and file its Corporation Tax Return correctly and on time.

CT600 Return Preparation

Preparation of your Company Tax Return (CT600) from your bookkeeping records, ready for HMRC submission.

Corporation Tax Computations

Full tax computations showing how your taxable profit and Corporation Tax liability have been calculated.

Accounts & Tax Computation Support

Micro-entity accounts tagged in iXBRL format and attached to your CT600 as HMRC requires.

Allowances & Reliefs Review

We check capital allowances, allowable expenses and available reliefs so nothing is claimed twice or missed.

HMRC Filing & Deadline Tracking

Online submission to HMRC plus reminders for your payment and filing deadlines.

─── How It Works

How Our CT600 Tax Return Filing Service Works

Share Your Company Records

Provide the accounting records and relevant company information required to prepare the return.

Review Your Accounting Figures

Review the financial information and identify relevant Corporation Tax adjustments.

Prepare the CT600

Prepare the Company Tax Return and supporting tax computation based on the company's circumstances.

Prepare the CT600

Prepare the Company Tax Return and supporting tax computation based on the company's circumstances.

Review & Approve

You review the information and confirm the return before submission.

File With HMRC

Submit the Company Tax Return through the appropriate HMRC filing process.

─── WHY CHOOSE US

Why Choose Our CT600 Tax Return Filing Service?

We keep Corporation Tax simple, transparent and predictable for busy company directors, with fixed fees agreed before any work begins.

Micro-Entity Expertise

We work exclusively with small limited companies filing under FRS 105, so the CT600 is routine work for us.

Accurate Accounts Preparation

Every adjustment, disallowed expense and capital allowance claim is documented and explained in plain English.

Tax & Filing Support

Missed a deadline? We prepare overdue CT600 returns quickly to limit penalties and interest building up.

Clear Fixed-Fee Pricing

One transparent fee covers preparation, iXBRL tagging and HMRC submission of your Corporation Tax Return.

───WHO WE HELP

CT600 Support for Micro-Entities Across the UK

We support qualifying micro-entity companies across London and the UK, from one-director businesses to consultants and online companies.

One-Director Companies

Straightforward CT600 preparation for owner-managed limited companies with simple salary and dividend structures.

Limited Companies Run by Freelancers & Contractors

Corporation Tax returns for contractors trading through qualifying micro-entity limited companies.

Startups & Small Companies

First-year and dormant-to-trading CT600 filings for newly incorporated and growing micro companies.

CT600 Deadlines and Late Filing Penalties

Corporation Tax has two separate deadlines, and HMRC charges penalties that increase the longer a return stays outstanding.

How late the CT600 is	HMRC penalty
1 day late	£100
3 months late	A further £100
6 months late	HMRC estimates your tax bill and adds 10% of the unpaid tax
12 months late	A further 10% of any unpaid tax

Penalty levels are set by Companies House and may change. Separate HMRC penalties and interest apply to a late Corporation Tax return and unpaid tax. Check the updated guide here.

Get Your CT600 Tax Return Filing in Isleworth Handled with Confidence

Preparing a Company Tax Return can quickly become complicated once you move from bookkeeping figures to a Corporation Tax computation, and it is easy to lose track of which records HMRC expects you to hold. Micro Entity Accounts supports Isleworth companies with CT600 preparation, Corporation Tax computation, tax adjustment review and HMRC filing, so the numbers reported are consistent with your accounts and the reasoning behind each adjustment is clear to you. Rather than wrestling with the return yourself alongside everything else your business demands, you can hand the detail over to someone who works with it every day. Get in touch with Micro Entity Accounts to discuss your company’s CT600 Tax Return Filing and take the next step with a team that keeps the process straightforward.

─── FAQs

Micro-Entity CT600 FAQs

Still unsure where you stand? Reach out to our UK team at info@microentityaccounts.co.uk and we will review your filing history with you.

What exactly is a CT600?

A CT600 is the form HMRC uses for a Company Tax Return. It sets out a company’s Corporation Tax position for an accounting period, including figures taken from the company’s accounts and the resulting calculation of taxable profit and any Corporation Tax due. It is submitted to HMRC, not to Companies House, and it is a different document from the statutory accounts a company files at Companies House.

Who needs to file a CT600?

Whether a company needs to file a CT600 depends on its circumstances. Companies can receive a notice from HMRC requiring a Company Tax Return, and there are situations where a return is expected even if no Corporation Tax is payable. Because the position varies from company to company, it is worth checking your specific obligations rather than assuming that dormant or loss-making status removes the requirement. We can help Isleworth companies establish what applies to them before preparing the return.

Is a CT600 the same as statutory accounts?

No. Statutory accounts are prepared under an accounting framework and filed with Companies House, where they are a matter of public record. A CT600 is a Company Tax Return submitted to HMRC to report the company’s Corporation Tax position. The two are separate filings with separate purposes, and although they are often prepared from the same underlying records, the figures presented can differ because of the tax adjustments made in the Corporation Tax computation.

How is a CT600 different from a Corporation Tax computation?

The Corporation Tax computation is the working document that starts with your accounting profit and adjusts it to arrive at taxable profit — for example by adding back expenses that are not allowable for tax, or accounting for income and reliefs treated differently for tax purposes. The CT600 is the return that reports the outcome of that computation to HMRC. In practice, the computation supports the figures entered on the CT600, so the two are closely linked but not the same thing.

Does a micro-entity company need to file a CT600?

A micro-entity may still have Corporation Tax obligations, and where HMRC requires a Company Tax Return, the company needs to submit a CT600. Operating as a micro-entity affects the accounting framework used for the accounts, but it does not by itself determine whether a return is required or what Corporation Tax is payable. The taxable position depends on the company’s own circumstances, and preparing accounts and filing a CT600 are related but separate processes.

Can a company file its CT600 without filing its accounts?

The CT600 and the statutory accounts are separate filings with separate recipients, so they do not have to be submitted at exactly the same moment. However, the accounts and accounting records normally provide the starting figures for the Corporation Tax computation, so it is sensible to have them prepared and reviewed first. Depending on the company’s circumstances and the accounting period involved, there may also be requirements around what must be submitted alongside the return.

What information is needed to prepare a CT600?

Typically we need the company’s accounting records for the period, the prepared accounts or a trial balance, details of income and expenses, any capital expenditure, and information about items treated differently for tax purposes. It also helps to have details of any losses brought forward or carried back, and any earlier returns or computations. If you are unsure what to send, we can provide a simple checklist so nothing important is missed.

Is filing a CT600 the same as paying Corporation Tax?

No — the filing obligation and the payment obligation are separate. Filing the CT600 reports the company’s Corporation Tax position to HMRC, while payment of any Corporation Tax due is handled separately and can fall due at a different time. A CT600 may show no Corporation Tax payable, and it is still possible to have a filing obligation. It is worth keeping both the filing and payment dates on your radar, and we can flag what applies to your company’s circumstances.

What happens if a CT600 is filed late?

Late filing can lead to HMRC penalties and interest, but the exact consequences depend on the circumstances and HMRCu2019s rules rather than a single fixed outcome. If you think a deadline is at risk, the practical step is to act early — getting the accounts and computation prepared promptly gives you more room to deal with the position rather than leaving it to escalate.