─── Specialist Micro-Entity Accountants In The UK

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

CT600 Tax Return Filing in Port Talbot is about making sure your company’s Corporation Tax position is calculated correctly and reported to HMRC on time. The CT600 is the Company Tax Return itself – a separate submission from the statutory accounts you file with Companies House, even where the two are prepared from the same underlying records. Professional support helps you pull together the accounting figures, review the tax adjustments needed to arrive at taxable profit, prepare the Corporation Tax computation and submit the return to HMRC with confidence. It also takes the guesswork out of a process that many directors only deal with once a year, giving you a clear record of what was filed, what it was based on, and what still needs your attention.

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.

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What Does the CT600 Mean for a Micro-Entity Company?

There is no separate official “micro-entity CT600” form. A CT600 is simply the Company Tax Return that companies – including those that qualify as micro-entities – use to report their Corporation Tax position to HMRC. Qualifying as a micro-entity affects how your statutory accounts are prepared and filed with Companies House, but it does not remove the need to consider Corporation Tax. Where HMRC requires a return, or where the company has taxable profits or other reportable matters, a CT600 will normally need to be submitted. The accounts and accounting records you prepare are usually the starting point for that return, but the figures in the CT600 are not automatically the same as the accounting profit shown in your accounts. Corporation Tax is calculated on taxable profit, and the tax computation may need adjustments – for example, for disallowable expenditure or items treated differently for tax purposes. Filing the CT600 and paying any Corporation Tax due are also two separate obligations: submitting the return does not by itself settle the tax, and how much tax is payable depends on the company’s own circumstances and taxable position.

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.

Let Us Handle the CT600 Tax Return Filing So You Can Get Back to Running the Business

Preparing a Company Tax Return can be fiddly: gathering the right figures, working out which expenses are allowable, adjusting accounting profit to reach taxable profit and then getting the CT600 submitted to HMRC correctly. That is where Micro Entity Accounts can help. We support directors with CT600 preparation, Corporation Tax computations, review of tax adjustments and the HMRC filing itself, so the return is built on accurate records and a clear audit trail rather than last-minute guesswork. If your year end is approaching, or a return is already outstanding, get in touch and we will talk you through what is needed and how we can take the filing off your hands.

─── 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 is a CT600?

A CT600 is the Company Tax Return submitted to HMRC. It reports your company's Corporation Tax position for an accounting period, setting out items such as income, allowable deductions, taxable profit and the tax calculated on it. It is an HMRC document and is separate from the statutory accounts a company files at Companies House, even though both are usually prepared from the same accounting records.

Who needs to file a CT600?

Whether a company needs to file a Company Tax Return depends on its circumstances and on what HMRC has issued. A company that is within the charge to Corporation Tax and has been sent a notice to deliver a return is generally required to file one. Some companies are issued with a notice to deliver even when no Corporation Tax is expected to be payable. Because the position varies, it is worth checking your own company's notice and circumstances rather than assuming either way.

Is a CT600 different from statutory accounts?

Yes. Statutory accounts are prepared under an accounting framework and filed with Companies House. The CT600 is a Corporation Tax Return filed with HMRC. They serve different purposes, go to different bodies, and can be prepared on slightly different bases. The accounting profit shown in your statutory accounts is usually the starting point for the tax computation, but it is not automatically the taxable profit reported on the CT600.

Is a CT600 different from a Corporation Tax computation?

They are related but not the same thing. The Corporation Tax computation is the working that takes your accounting profit, adds back disallowable items, deducts allowable ones and arrives at taxable profit and the resulting tax figure. The CT600 is the return that reports the outcome of that work to HMRC. A good filing is built on a clear computation, because that is what shows how the reported figures were arrived at.

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

A company that qualifies as a micro-entity may still have Corporation Tax obligations and, where a return is required, will need to submit a Company Tax Return to HMRC in the usual way. There is no separate micro-entity CT600 form. The micro-entity accounting framework affects how the statutory accounts are prepared, but it does not by itself determine the Corporation Tax liability – that depends on the taxable position after any required tax adjustments.

How is taxable profit calculated from accounting profit?

Taxable profit generally starts with the accounting profit from your accounts, but adjustments are usually needed. Expenses that are not allowable for tax purposes may be added back, and items that are treated differently under tax rules may be adjusted. Capital allowances and other reliefs may also be relevant depending on your circumstances. The result is a Corporation Tax computation showing taxable profit and the tax due, which is then reported on the CT600.

Is filing a CT600 the same as paying Corporation Tax?

No. Filing the return and paying any Corporation Tax due are separate obligations with separate processes. Submitting the CT600 reports your position to HMRC; the payment itself has to be made by the relevant method and date for your company. A return can also be filed showing no tax payable, depending on the company's circumstances. It is worth planning for both elements rather than assuming one follows automatically from the other.

Can someone prepare and file a CT600 on behalf of my company?

Yes. A director can authorise an accountant or tax agent to prepare the return and submit it to HMRC on the company's behalf, and to act as the company's agent for Corporation Tax correspondence. You remain responsible for the accuracy and completeness of the information provided, which is why a proper review of the accounts and the tax adjustments matters. With records in good order, the filing process itself is usually straightforward once the figures have been agreed.

What happens if a company files its CT600 late?

Late filing and late payment can lead to penalties and interest charges from HMRC, and the amount depends on factors such as how late the return or payment is and the company's own circumstances. Rather than relying on estimates, it is best to check HMRC's current published guidance or ask us for help. If a return is already overdue, acting quickly to get the position resolved usually gives you more options than waiting.