--- title: "Corporation Tax Returns in Cardiff | Luminaire Accounts" description: "CT600 and iXBRL preparation and filing, clear tax calculations, deadline tracking, and support with HMRC queries for small companies in Cardiff." canonical: "https://hlsaccounting.co.uk/services/corporation-tax-returns" --- Tax Services - Business # 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. [Book a free consultation](https://calendly.com/hlsaccounting/new-client-meeting) 10+ Years experience 200+ Returns filed 100% On-time filing rate ![Accountant at a desk using a laptop and calculator while reviewing corporate tax documents in a clean office.](/_next/image?url=%2Fapi%2Fmedia%2Ffile%2Faccountant_corporation_tax_return_studio_photo.png%3Fv%3D1773064208310&w=1536&q=75&dpl=dpl_DEc4fGhEc1SCRZZutzoEsRuDy1CJ) ## 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. ### Ready to talk? Book a free consultation and we'll explain exactly how we can help with your corporation tax return. [Book a free consultation](https://calendly.com/hlsaccounting/new-client-meeting) ### While you're here - [SEIS (Seed Enterprise Investment Scheme) Advice](/services/seis-seed-enterprise-investment-scheme-advice)→ - [Enterprise Investment Scheme (EIS) Advice](/services/enterprise-investment-scheme-eis-advice)→ - [Patent Box Tax Relief](/services/patent-box-tax-relief)→ ## Worth considering Tax Services - Business ### 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)→](/services/tax-relief-on-business-assets-aia) Tax Services - Business ### 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→](/services/hmrc-enquiry-and-investigation-support) Tax Services - Business ### 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→](/services/business-tax-planning) Tax Services - Business ### 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→](/services/randd-tax-credits) Tax Services - Business ### 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→](/services/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? Your CT600 must be filed within 12 months of your accounting year-end. The tax itself is due nine months and one day after your year-end. We track both deadlines for you and make sure everything is submitted on time. What information do you need from me? We'll need your bookkeeping records, bank statements, invoices, receipts, payroll summaries, and details of any loans, dividends, or significant purchases. If your records are up to date in accounting software like Xero or QuickBooks, we can pull most of it directly. How much does it cost? Our fees depend on the complexity of your accounts and the size of your business. We'll give you a fixed price quote after an initial conversation, so you know exactly what you're paying before we start. Can you help if I've missed a filing deadline? Yes. Late filing carries penalties, but we can prepare and submit overdue returns as quickly as possible to minimise further penalties and get you back on track with HMRC. Do I need to make quarterly payments? Most small limited companies pay corporation tax as a single annual amount. Larger companies with profits over £1.5 million may need to pay quarterly instalments. We'll let you know if this applies to you and help you plan your cash flow accordingly. What happens if I've overpaid or underpaid tax in previous years? We can review prior year returns, claim refunds if you've overpaid, and arrange payment plans with HMRC if you've underpaid. Adjustments are made through your current return or via separate claims depending on the circumstances. Can you help with tax planning, not just filing? Absolutely. We advise on salary versus dividend planning, capital allowances, timing of expenditure, and other strategies to reduce your corporation tax bill legally and effectively throughout the year. ## 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](https://calendly.com/hlsaccounting/new-client-meeting)