Choosing the right corporation tax return accountant protects both your cash flow and your peace of mind. We prepare your CT600, compute the tax owed and file everything with HMRC up to twelve months after your year-end, while claiming every capital allowance and relief you are entitled to. Our London corporation tax team looks after companies of every size and explains the numbers in plain English.
Every UK limited company must file an annual corporation tax return (CT600) with HMRC, regardless of whether you made a profit. This return details your company's income, expenses, and tax liability.
Getting your corporation tax return right is crucial—errors can lead to HMRC investigations, penalties, or overpayment of tax. Our ACCA-certified tax specialists ensure accuracy while identifying legitimate tax-saving opportunities.
With corporation tax rates varying from 19% to 25% based on profit levels, expert guidance can save your business thousands of pounds annually while maintaining full compliance.
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Comprehensive tax return services from preparation to submission
Expert preparation and submission of your corporation tax return to HMRC with full accuracy
Detailed tax calculations accounting for allowable expenses, reliefs, and tax-saving opportunities
Strategic advice to legally minimise your corporation tax liability and improve cash flow
Corporation tax rates vary based on your company's taxable profits
Lower rate for companies with smaller profits
Gradual increase via marginal relief calculation
Standard corporation tax rate for higher profits
The profit thresholds are divided by the number of associated companies plus one. If you have two companies, the £50,000 threshold becomes £25,000 per company. We help you navigate these complex rules.
Reduce your taxable profits by claiming legitimate business expenses
Expenses must be "wholly and exclusively" for business purposes. Mixed-use items like home office costs can be partially claimed. We ensure all expense claims are legitimate and properly documented for HMRC compliance.
Key deadlines your corporation tax return accountant works to
Financial year closes
Pay corporation tax to HMRC
Submit CT600 tax return
All our corporation tax return packages come at a fixed fee agreed up front after a free consultation — never an hourly rate. Your price is based on your turnover, transaction volume and the services you need, so you always know exactly what you're paying. Every package includes CT600 preparation, full tax computations, capital allowance and relief claims, unlimited email support, and a dedicated ACCA-qualified accountant.
Highest qualified accountants with deep corporation tax knowledge
We identify every legitimate deduction and relief to minimise your tax bill
We manage all deadlines to avoid penalties and interest charges
Year-round strategic advice to optimise your tax position
Real feedback from businesses we've helped succeed
"1st Accountants transformed our tax management. Their MTD expertise saved us thousands and gave us peace of mind. Highly professional service!"
Sarah Mitchell
Tech Startup Ltd
The accounts, planning and support that surround an accurate CT600
Corporation tax is one of the largest costs a profitable company faces, and it is also one of the most commonly miscalculated. As your corporation tax return accountant, we prepare accurate CT600 returns, claim every allowance you are entitled to and file ahead of the deadline.
We also look further ahead. By reviewing how profits are earned, invested and extracted, we can often reduce the overall tax burden across the company and its owners, rather than simply reporting what is owed.
You will know what you owe, why you owe it and when it is due, with clear computations to back it up. Combined with forward planning, corporation tax becomes a managed cost rather than a year-end shock.