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.
Every UK limited company is responsible for calculating, reporting, and paying Corporation Tax on its taxable profits. Keeping accurate financial records and filing your Corporation Tax Return on time helps maintain HMRC compliance, supports better financial planning, and ensures your business claims all available allowances and reliefs while avoiding unnecessary penalties and interest charges.
Every UK limited company is legally required to file a Corporation Tax Return with HMRC, regardless of whether it made a profit. Accurate filing helps businesses remain compliant, avoid unnecessary penalties, and ensure all eligible reliefs and allowable expenses are correctly claimed. Professional support also provides confidence that your tax obligations are managed efficiently and on time.
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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.
