We will do your CT600 company (corporation) tax return as well as:
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Prices start from £40/month + VAT
If you run a small business, limited company, or partnership, you’re required to submit a tax return to HMRC to report your business income and claim any eligible tax allowances. This is known as a corporation tax return or company tax return. Completing it can be complex, so professional assistance is recommended to ensure it’s filed accurately and to avoid costly errors. If HMRC issues a company tax return, it must be completed.
Yes you need to complete a company tax return if you are a small business, limited company or partnership.
Yes, it’s entirely free and usually straightforward to complete. However, errors can be costly. Would you cut your own hair just because it’s free? Probably not! For just £75, a qualified accountant can prepare and submit your tax return, giving you peace of mind that it’s done correctly. It also reduces stress and frees up your time to focus on what really matters.
Any late submissions will be fined a minimum of £100 by HMRC.
October 31st for paper tax returns and January 31st for online tax returns.
Corporation Tax Return
Does the idea of completing your company tax return (CT600) stress you out? Do you often leave it until the very last minute?
Procrastinating can lead to mistakes, missed details, and errors.
We make company tax returns simple. With our help, you won’t have to deal with HMRC directly, you’ll never miss a deadline, and you’ll always pay the correct amount of tax.
Stress Free Accountancy Service
At Oakstone Accountants, we understand the pressures of running a small business. Our monthly accounting subscription can take one of those burdens off your shoulders. We support start-ups, sole traders, small businesses, freelancers, and Limited Companies with their monthly accounts.
Our company tax return service is just one part of our comprehensive monthly accounting subscription.
With a single monthly fee, no hidden costs, and exceptional support from a team of qualified accountants, you can focus on running your business while we handle the numbers.
-> Monthly management accounts
-> Bookkeeping
-> VAT returns
-> Monthly payroll
-> Statutory end of year accounts
-> Self assessment tax return
What is a Company Tax Return (CT600)?
A Company Tax Return (CT600) must be submitted to HMRC by Ltd Companies after their financial year ends.
A Ltd Company’s financial year can end on any month, usually based on the incorporation date. The tax return deadline is 12 months after the accounting period ends, while the Corporation Tax payment is due 9 months and one day after. Missing these deadlines can result in penalties.
We advise clients to file early to ensure clarity on payments. You can check your company’s year-end on the Companies House website.
How do I file a Company Tax Return?
Ltd Companies can submit their Corporation Tax Return (CT600) through the HMRC website or using third-party software. However, you must also submit your Company Accounts at the same time, not just as a PDF, but in the iXBRL format. Producing accounts in this format requires specialist software, and it’s not recommended for business owners to attempt this without prior experience.
It’s always safer to have a professional prepare and file your Accounts and Company Tax Return for you, ensuring everything is accurate and avoiding potential fines or penalties from HMRC for late or incorrect submissions.
Who has to file a Company Tax Return?
All Ltd Companies, no matter their size or profit, must submit a Corporation Tax Return (CT600) to HMRC. HMRC will issue a ‘Notice to Deliver a Company Tax Return’ specifying your filing deadline. It’s essential to verify this date and notify HMRC if your company should be filing on a different schedule.
Some Ltd Companies may be exempt from filing if HMRC considers them ‘dormant for Corporation Tax.
What is the purpose of a Company Tax Return?
Your Company Tax Return (CT600) reports your company’s taxable profit to HMRC, showing how much tax is due.
Taxable profit can differ from operating profit depending on accounting treatments and allowances, so it’s crucial to either understand the process fully or rely on experts like Oakstone Accountants to handle it correctly.
When to file a CT600 Company Tax Return?
You must file your company tax return (CT600) within 12 months of the end of your accounting period, which usually aligns with your company’s financial year. For the first year, the accounting period may exceed 12 months, meaning you might need to submit two CT600 returns.
Companies House sets your company’s financial year-end, typically the last day of the month your company was incorporated. You can change this date, but only once every five years, so ensure it’s worthwhile.
Corporation tax is due nine months and one day after the end of the accounting period, earlier than the CT600 filing deadline. This means you may need to calculate your tax three months before filing.
Most clients have their accounts and CT600 prepared well in advance, avoiding any last-minute stress or complications.
Late filing Penalties for the CT600 Company Tax Return
HMRC penalties for late company tax return filing can escalate quickly:
--> 1 day late: £100
--> 3 months late: Additional £100
--> 6 months late: 10% of estimated corporation tax (HMRC’s estimate, not appealable)
--> 12 months late: Another 10% of estimated corporation tax
Repeated late filing increases penalties—for example, three consecutive late submissions raise the £100 fines to £500 each.
Separate penalties apply for late payment of corporation tax. While HMRC may accept a limited number of “reasonable excuses,” filing on time is the safest way to avoid fines and scrutiny.