The CT600 is the Company Tax Return companies file with HMRC to report profits and calculate Corporation Tax. We prepare and submit it for you, based on your annual accounts.

What are the current Corporation Tax rates?

The main rate of Corporation Tax is 25% for profits over £250,000, with a small profits rate of 19% for profits up to £50,000 and marginal relief in between. We apply the correct rate for your profits and claim any reliefs available.

When do I have to pay and file?

For most companies, Corporation Tax is due 9 months and 1 day after the end of the accounting period, while the CT600 return must be filed within 12 months of the period end. We manage both dates so nothing is missed.

How do you help me pay less tax?

By identifying the reliefs and allowances your company is entitled to — such as capital allowances and other claims — and making sure they're applied correctly. The aim is that you pay the right amount of tax, and no more.

Delivered through our accounting & compliance partners

Corporation Tax

CT600 calculated and filed, reliefs claimed

Calculation and submission of your Corporation Tax return (CT600), including identification of available reliefs and allowances to help you not pay extra tax. Our accounting and compliance partners prepare your return from your accounts, apply the correct rates, claim what you're entitled to, and file with HMRC on time — so your Corporation Tax is accurate and optimised.

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How it works

Step 1: Calculate your Corporation Tax

We calculate your Corporation Tax from your annual accounts, applying the correct rates and adjustments so your figure is accurate.

Step 2: Identify reliefs and allowances

We identify the reliefs and allowances available to you — from capital allowances to other claims — so you don't pay more tax than you need to.

Step 3: Submit your CT600 to HMRC

We prepare and submit your Corporation Tax return (CT600) to HMRC on time, and tell you clearly what to pay and by when.

Why choose Filing HQ for Corporation Tax?

Don't overpay: We identify available reliefs and allowances so you don't pay extra tax unnecessarily.
Accurate CT600: Your Corporation Tax return is calculated from your accounts and submitted correctly to HMRC.
Deadlines managed: We keep track of your payment and filing deadlines so you avoid interest and penalties.
Aligned with your accounts: Your CT600 and annual accounts are prepared together, so everything reconciles.

A complete accounting & compliance suite

This is one part of everything our partners handle — from getting set up correctly to ongoing compliance and growth advisory. See all accounting & compliance services →

Frequently Asked Questions

What is a CT600?: The CT600 is the Company Tax Return companies file with HMRC to report profits and calculate Corporation Tax. We prepare and submit it for you, based on your annual accounts.
What are the current Corporation Tax rates?: The main rate of Corporation Tax is 25% for profits over £250,000, with a small profits rate of 19% for profits up to £50,000 and marginal relief in between. We apply the correct rate for your profits and claim any reliefs available.
When do I have to pay and file?: For most companies, Corporation Tax is due 9 months and 1 day after the end of the accounting period, while the CT600 return must be filed within 12 months of the period end. We manage both dates so nothing is missed.
How do you help me pay less tax?: By identifying the reliefs and allowances your company is entitled to — such as capital allowances and other claims — and making sure they're applied correctly. The aim is that you pay the right amount of tax, and no more.

Corporation Tax

Why choose Filing HQ for Corporation Tax?

A complete accounting & compliance suite

Frequently Asked Questions

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