Limited Companies

We support Limited Companies in fulfilling their tax responsibilities through a range of professional services:

• Preparing detailed tax computations by adjusting company accounts for tax purposes
• Completing and filing Corporation Tax Return forms (CT600) for each accounting period
• Monitoring deadlines to ensure timely submissions and making all eligible tax claims
  

We understand that tax can be a major expense, if there’s a way to reduce it, we’ll make sure you know about it.

What is a Company Tax Return (CT600)?

A CT600 is the main form used in your Company Tax Return and must be filed with HMRC annually after your financial year ends.

Your company’s financial year usually ends on the last day of the incorporation month. The CT600 must be submitted within 12 months of this date. Missing this deadline results in penalties.

Keep in mind, the payment deadline is separate, typically nine months and one day after the end of your accounting period. Filing early ensures you know your liabilities well in advance.

What is the purpose of a Company Tax Return?

Your CT600 tells HMRC how much Corporation Tax your business owes. It’s based on taxable profits, not just operating profits, so allowances and adjustments matter.

Stanley House Accountants ensures every figure is accurate and compliant, so you never pay more than required.

Who has to file a Company Tax Return?

All Limited Companies must file a CT600, even if there’s no profit. You’ll receive a “Notice to Deliver” from HMRC, which includes your filing deadline.

Only HMRC-designated “dormant” companies may be exempt. If you receive a notice and believe it’s incorrect, it’s important to notify HMRC promptly.

How do I file a Company Tax Return?

You can file online via HMRC or third-party software—but this requires accounts in iXBRL format, not just a simple PDF. Without proper tools or experience, it’s easy to get it wrong.

Let Stanley House Accountants handle it for you—from iXBRL-compliant accounts to CT600 filing—ensuring accuracy and compliance every step of the way.

When to file a CT600 Company Tax Return

CT600 must be filed within 12 months of your accounting period end. Your first financial year may span over 12 months, requiring two CT600s for that year only.

Companies House sets your financial year-end—usually matching your incorporation month. While you can change it, this is only allowed once every five years, so it must be planned wisely.

We recommend early preparation so you meet both the filing and payment deadlines stress-free.

Late filing Penalties for the CT600 Company Tax Return

Missing your CT600 deadline triggers the following penalties:

• 1 day late: £100
• 3 months late: +£100
• 6 months late: 10% of estimated tax
• 12 months late: Another 10%
  

Repeat offenses mean higher fines—£500 for late returns filed three times in a row. Late payment penalties also apply separately.

HMRC accepts only limited excuses for delays. The best solution? Let us file early and keep you penalty-free.