Corporation tax is a tax charged by HMRC on the profits of UK limited companies. It applies to all incorporated businesses and is calculated based on annual taxable profits. Understanding what is corporation tax helps businesses plan finances, stay compliant and avoid penalties. Rates can vary depending on profit levels, including updates like corporation tax rates 2026 making proper tax knowledge essential.
Corporation tax deadlines are set by HMRC under corporation tax compliance rules. Knowing the corporation tax deadline helps avoid penalties and late filing issues.
Must file corporation tax returns with HMRC
Need help with first-time CT600 filing and tax setup
Require ongoing corporation tax compliance and reporting
Need accurate tax filing as profits and transactions increase
Tax Return Filed
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Register your company with HMRC for corporation tax
Receive a Unique Taxpayer Reference (UTR)
Activate your online HMRC account
Prepare accurate company financial statements
Include income, expenses, and profits
Ensure records are HMRC-compliant
Work out taxable profits after deductions
Apply current corporation tax rates
Ensure correct tax calculation
File your CT600 return through HMRC online system
Include all required financial details
Ensure timely submission before deadline
Pay corporation tax within the deadline
Avoid penalties and interest charges
Confirm payment completion with HMRC
Corporation tax is due 9 months and 1 day after the end of your accounting period.
A CT600 is the official corporation tax return form submitted to HMRC by UK limited companies.
You must prepare accounts, calculate tax, and submit the CT600 online to HMRC.
Corporation tax compliance means meeting all HMRC rules, deadlines, and filing requirements correctly.
Missing deadlines can result in HMRC penalties, interest charges, and compliance issues.
A corporation tax accountant handles calculations, compliance, and accurate filing of your company tax return.
It means following HMRC rules, deadlines, and filing requirements for corporation tax.
Yes, but most businesses use professionals to avoid errors and HMRC penalties.
Payment is due 9 months and 1 day after your accounting year ends.
Late filing can result in automatic fines and increasing penalties from HMRC.
