Corporation tax has stopped being simple: a 25% main rate with marginal relief arithmetic, quarterly instalments for larger companies, R&D relief under aggressive HMRC scrutiny, capital allowances regimes that reward timing, and an international layer - transfer pricing, Pillar 2, withholding taxes - that reaches further down the size scale every year. Compliance and planning have become inseparable.
The UK's corporate tax services market reflects that: specialist tax teams inside regional chartered firms, national groups with hundreds of tax professionals, and practices whose advisers include former HMRC inspectors. The right provider depends on your company's size, group structure and how much of the advisory layer you actually need.
This guide highlights a selection of corporate tax services companies across the UK. It is not a ranking - the aim is context: each firm's scale, specialisms and the kind of company it serves best.
Acumon
Acumon is a London firm of chartered accountants whose corporate tax practice runs from compliance to planning with an unusual pedigree: many of its qualified tax advisors previously worked for HMRC, and a Chartered Tax Advisor sits in-house. Corporation tax returns and computations are prepared with reliefs actually claimed - capital allowances, loss choices made deliberately - and iXBRL-tagged accounts attached as HMRC requires, with quarterly instalment obligations monitored for growing companies.
The planning side works ahead of the year end, when recommendations can still be acted on: profit extraction for owner-managers, R&D relief where work genuinely qualifies, group structures that do not leak tax, and disposals planned before heads of terms. Because the firm advises companies and their directors together, planning covers both sides of the boundary - and if HMRC opens an enquiry, in-house tax investigation specialists take over the correspondence.
Key Highlights:
- Many of the firm's qualified tax advisors previously worked for HMRC
- In-house Chartered Tax Advisor (CTA)
- Pre-year-end planning reviews timed so recommendations can be acted on
- Companies and their owners advised together
- All 90 of the firm's professionals are based in the UK
Services:
- Corporation tax returns, computations and iXBRL filing
- Corporate tax planning and pre-year-end reviews
- Capital allowances and R&D relief claims
- Group structures and reorganisations
- Quarterly instalment monitoring
- HMRC enquiry and investigation support
Contact Information:
- Website: acumon.com
- E-mail: [email protected]
- Address: 1-2 Craven Road, Ealing, London, W5 2UA, UK
- Phone: 020 8567 3451
Johnston Carmichael
Johnston Carmichael fields one of the largest tax teams outside the top tier - more than 140 tax people within a firm of over 1,000 staff across 11 UK offices from Aberdeen to London. Corporate tax compliance runs deep: annual compliance, Senior Accounting Officer matters, tax strategy publication, HMRC Business Risk Reviews, enquiry support and Corporate Criminal Offence compliance.
The advisory layer reaches wherever modern corporate tax does - transfer pricing, Pillar 2, withholding taxes and country-by-country reporting internationally; group planning, reorganisations, debt deductibility and innovation credits domestically - with a dedicated Transaction Tax team for M&A, exits and refinancings. Moore Global membership supports international expansion.
Key Highlights:
- Tax team of 140+ across 11 UK offices
- SAO, Business Risk Review and CCO compliance support
- Transfer pricing and Pillar 2 capability
- Dedicated Transaction Tax team
- Moore Global network member
Services:
- Corporation tax compliance
- Senior Accounting Officer support
- HMRC enquiry support
- International tax and transfer pricing
- Group tax planning and reorganisations
- Innovation tax credits
- Transaction tax
- Entrepreneurial taxes
Contact Information:
Kreston Reeves
Kreston Reeves runs its corporate tax practice across London, Kent and Sussex - now part of the AAB Group following a recent merger, and a member of the Kreston Global network spanning more than 120 countries. Compliance and reporting sit alongside an advisory list built for growing companies: R&D relief, restructuring, capital allowances reviews and transfer pricing.
Transaction work is a strength - tax due diligence for M&A, exit planning and international tax in both directions - together with the employee incentive layer: EMI schemes, share incentives and EIS/SEIS venture capital schemes. B Corp certification and ICAEW regulation frame a practice led by named corporate tax specialists.
Key Highlights:
- Part of AAB Group with Kreston Global reach in 120+ countries
- R&D, restructuring and transfer pricing advisory
- Tax due diligence and exit planning for deals
- EMI, EIS and SEIS scheme expertise
- B Corp certified
Services:
- Corporation tax compliance and reporting
- R&D tax relief
- Corporate restructuring
- Transfer pricing
- Tax due diligence for M&A
- Capital allowances reviews
- EMI and share incentive schemes
- EIS/SEIS advice
Contact Information:
- Address: 2nd Floor, 168 Shoreditch High Street, London E1 6RA
- Phone: +44 (0)330 124 1399
Azets
Azets brings international group scale to the mid-market: 190 offices across eight European countries, with UK corporate tax services covering compliance and reporting, iXBRL, and tax accounting under both UK GAAP and IFRS. The advisory range reads like a corporate tax syllabus - group relief and loss optimisation, SAO regime, corporate interest restrictions, innovation and capital reliefs.
Deal support spans M&A tax, due diligence and structuring, plus restructuring for tax efficiency, Substantial Shareholding Exemption planning and Business Asset Disposal Relief. ICAEW regulation and ISO 27001 certification underpin delivery - and for groups operating across Europe, having one advisor either side of borders is the practical draw.
Key Highlights:
- 190 offices across eight European countries
- Tax accounting under UK GAAP and IFRS
- Group relief and corporate loss optimisation
- M&A tax and corporate restructuring
- ISO 27001 certified
Services:
- Corporation tax compliance and reporting
- iXBRL tagging
- Tax accounting (UK GAAP and IFRS)
- Group relief and corporate losses planning
- M&A tax and due diligence
- Corporate restructuring
- International tax
- Innovation and capital reliefs
Contact Information:
- E-mail: [email protected]
- Address: 5th Floor, 16 Great Queen Street, Covent Garden, London WC2B 5DG
HW Fisher
HW Fisher is a London chartered firm specialising in owner-managed businesses, whose corporate tax compliance stretches from startups to multinationals: corporation tax returns, ATED reporting, corporate interest restriction returns and senior accounting officer reporting. Its international desk sets up UK operations for overseas-owned businesses, serving substantial numbers of US, European and Far Eastern clients.
Advisory strengths map onto its client base: employee share incentives from EMI options to employee ownership trusts, property tax on acquisitions, disposals and development, and structuring across companies, partnerships and branches. GGI membership - a top-ten international accounting alliance - extends the reach, with VAT advice and HMRC negotiations handled in-house.
Key Highlights:
- Owner-managed business specialism in London
- ATED and corporate interest restriction reporting
- UK setup for overseas-owned businesses
- EMI, growth shares and EOT expertise
- GGI international alliance member
Services:
- Corporation tax compliance
- ATED and corporate interest restriction reporting
- Employee share incentives
- Property tax advice
- International tax structuring
- VAT advice and HMRC negotiations
- Audit
- Transaction services
Contact Information:
- Address: Acre House, 11-15 William Road, London NW1 3ER
- Phone: +44 (0)20 7388 7000
Sedulo
Sedulo runs corporate tax from a seven-city footprint - Manchester, Leeds, London, Liverpool, Birmingham, Glasgow and Dubai - with a team of chartered accountants and chartered tax advisors recruited in part from Big Four firms, and a National Head of Tax with over 16 years' experience. Corporation tax planning and compliance sit alongside VAT advisory within one tax function.
The specialist list runs current: HMRC enquiries and dispute resolution, capital allowance reviews, group simplification, international structuring, and the incentive layer of EMI planning, EIS/SEIS and share schemes - plus creative industry tax reliefs, a niche few regional firms cover properly. The style is deliberately modern; the technical depth is conventional and real.
Key Highlights:
- Seven-city UK and international footprint
- Big Four-recruited tax professionals
- HMRC enquiries and dispute resolution
- Creative industry tax relief specialism
- EMI, EIS and share scheme planning
Services:
- Corporation tax planning and compliance
- VAT advisory and compliance
- HMRC enquiries and dispute resolution
- Capital allowance reviews
- Group simplification
- International tax structuring
- EMI and share schemes
- Creative industry tax reliefs
Contact Information:
Page Kirk
Page Kirk carries over 120 years of Nottingham heritage into a modern corporation tax compliance and advisory service, staffed by chartered accountants and chartered tax advisers under ICAEW membership. Returns are filed and deadlines managed, with reliefs identified across capital allowances, R&D credits and beyond.
The advisory posture is forward-focused: strategic planning on capital expenditure timing and business structure optimisation, corporation tax payment estimates for large companies, and clear advice on deductible costs. Audit, corporate finance, HMRC investigations, property tax and trusts round out a practice with national and international reach from an East Midlands base.
Key Highlights:
- 120+ years of practice heritage
- Chartered accountants and chartered tax advisers
- Capital expenditure timing and structure planning
- Payment estimates for large companies
- HMRC investigation support in-house
Services:
- Corporation tax compliance
- Corporation tax advisory and planning
- R&D tax credits
- Capital allowances
- HMRC investigations
- Audit
- Business advisory
- Property tax
Contact Information:
- E-mail: [email protected]
- Address: Sherwood House, 7 Gregory Boulevard, Nottingham
- Phone: 0115 955 5500
Chadwicks
Chadwicks serves Greater Manchester from offices in Manchester, Glossop and Stockport - an ICAEW-regulated, audit-registered firm whose corporate tax compliance service is framed around minimising corporation tax liabilities within the rules. Structure advice covers tax-effective setup, disposals and acquisitions.
Capital allowances, capital gains guidance and R&D relief claims form the relief layer, with HMRC representation handled directly and tax investigation insurance offered - a practical hedge for smaller companies. Audit, corporate finance, and personal, inheritance and estate planning make the firm a complete adviser for owner-managed companies and their families.
Key Highlights:
- Three Greater Manchester offices
- Compliance framed around liability minimisation
- R&D claims and capital allowances handled
- Tax investigation insurance offered
- Personal and estate planning for owners alongside
Services:
- Corporate tax compliance
- Corporation tax planning
- R&D tax relief claims
- Capital allowances
- HMRC representation
- Tax investigation insurance
- Audit
- Corporate finance
Contact Information:
- E-mail: [email protected]
- Address: Capital House, 272 Manchester Road, Manchester M43 6PW
- Phone: 0161 370 9600
Conclusion
Corporate tax providers sort by the complexity they are built for: national and international groups need firms with transfer pricing, Pillar 2 and SAO capability as standard; growing UK companies are best served by practices that integrate planning with compliance and watch the instalment thresholds; and owner-managed businesses gain most from advisers who plan the company and its owners together. Paying for capability you do not need is as real a cost as lacking capability you do.
This guide was compiled to make that matching straightforward. Whichever firm you engage, the habits that matter are consistent: planning conversations before year-end rather than after, reliefs claimed with evidence that survives HMRC's current scrutiny, deadlines and payments owned by the firm, and - when HMRC asks questions - advisers who have sat on both sides of that table.
