Corporation Tax Returns
We take care of your corporation tax return from start to finish, so you can focus on running your business. Based in Cardiff, we serve small businesses and limited companies across South Wales with clear, jargon-free advice and filing that's always on time.
What we cover
From calculating your liability to filing with HMRC, we handle every part of your corporation tax return. Whether you're a new limited company or an established SME, we make sure you're compliant and not paying a penny more than you need to.
Year-end accounts preparation
Full preparation of your profit and loss statement and balance sheet, ready for filing alongside your CT600.
Corporation tax calculations
Accurate calculation of your corporation tax liability, including relief claims and adjustments for prior years.
CT600 filing and submission
Completion and electronic filing of your CT600 return to HMRC, meeting all deadlines and compliance requirements.
Estimated tax and payment planning
Guidance on quarterly payment obligations and managing your tax cash flow throughout the year.
How we handle your corporation tax return
Every limited company in the UK must file a corporation tax return (CT600) within 12 months of its accounting year-end, and pay any tax due within nine months and one day. We prepare your year-end accounts, calculate your corporation tax liability, and file everything with HMRC on time. You get a clear breakdown of what you owe and why, with no surprises.
Our process starts with your bookkeeping records. We review your transactions, prepare your statutory accounts, and identify any allowable deductions or reliefs you're entitled to claim. Once your accounts are finalised, we calculate your corporation tax, complete the CT600 form, and submit it electronically to HMRC. You receive copies of everything, along with a simple summary of your tax position.
We make sure you're compliant, and we make sure you're not overpaying.
More information
Many Cardiff businesses we work with are sole traders who've recently incorporated, or small limited companies filing their first or second return. If you're new to corporation tax, we walk you through the process step by step. If you've been filing for years, we simply take the workload off your plate and keep you informed at every stage.
What's included
- Preparation of your statutory accounts (profit and loss, balance sheet, notes)
- Calculation of your corporation tax liability
- Completion and electronic filing of your CT600 return
- Identification of allowable expenses, capital allowances, and reliefs
- Advice on estimated quarterly payments if applicable
- Confirmation of payment deadlines and amounts due
We also advise on tax-efficient strategies throughout the year, not just at filing time. That might mean optimising your salary and dividend split, timing capital expenditure to maximise allowances, or planning ahead for R&D tax credits if your business qualifies.
Filing on time is non-negotiable, and so is getting your tax bill right.
Whether you're based in Cardiff city centre, Whitchurch, Penarth, or anywhere across the Vale and South Wales, we work with local businesses in all sectors. Retail, hospitality, trades, healthcare, professional services: we understand the tax rules that apply to your industry and structure your return accordingly.
If you've been managing your own returns and want to hand them over, or you're switching from another accountant, we make the transition straightforward. We'll review your prior filings, take over from your current year-end, and make sure everything's in order going forward. No fuss, no jargon, just reliable support when you need it.
Worth considering
Tax Relief on Business Assets (AIA)
Claim Annual Investment Allowance (AIA) on qualifying equipment, fit-outs and vans. We check eligibility, calculate capital allowances and include the claim in your return.
Tax Relief on Business Assets (AIA)→HMRC Enquiry & Investigation Support
Support with HMRC enquiries and investigations, from the first letter to the final outcome. We organise records, manage deadlines, and deal with HMRC on your behalf.
HMRC Enquiry & Investigation Support→Business Tax Planning
Plan ahead for Corporation Tax or Self Assessment, forecast what you will owe, and use allowances, expenses and profit extraction sensibly.
Business Tax Planning→R&D Tax Credits
Claim R&D Tax Credits without the stress. We confirm eligibility, calculate qualifying costs, write the supporting report, and submit the claim with your Corporation Tax return.
R&D Tax Credits→Corporation Tax Planning
Get a clear estimate of your company’s corporation tax, plan director pay and spending, and avoid nasty surprises at year end with practical, plain-English advice.
Corporation Tax Planning→Before we start
These are the questions we hear most often from limited companies looking for help with their corporation tax returns.
When does my corporation tax return need to be filed?
What information do you need from me?
How much does it cost?
Can you help if I've missed a filing deadline?
Do I need to make quarterly payments?
What happens if I've overpaid or underpaid tax in previous years?
Can you help with tax planning, not just filing?
Let's sort your corporation tax return
Book a free consultation and we'll talk through your situation, explain our process, and give you a clear fixed-price quote.
Book a free consultation