Corporate Tax UK: Returns, Planning & Advisory
Our partner firms and specialists handle UK corporate tax compliance and advisory, from CT600 returns to R&D claims, loss planning and cross-border structuring.
UK corporate tax compliance and planning
Corporation tax compliance requires accurate returns, timely filing and careful analysis of reliefs, allowances and group positions.
What our partner firms and specialists deliver
- CT600 corporation tax return preparation and submission
- Patent box and R&D tax credit claims
- Capital allowances, including AIA and full expensing
- Loss relief and group relief claims
- Deferred tax accounting
- Transfer pricing documentation and compliance
- Corporate interest restriction calculations
- HMRC enquiry and investigation support
- Tax due diligence for acquisitions
- International tax structuring advice
- Pillar II registration and impact assessment
R&D tax credits
Many UK businesses significantly underclaim R&D tax credits. Our partner firms include specialists in the SME scheme and RDEC, covering technology, engineering, pharmaceutical and financial services sectors. Claims are prepared with full compliance documentation following HMRC's 2023 reform guidance.
Check your Corporation Tax and company filing deadlines
Calculate the usual Corporation Tax payment date and CT600 filing deadline from an accounting period end, or use the wider filing tool for Companies House accounts and confirmation statement dates.
Frequently asked questions
Corporate tax guidance for UK businesses and growing groups.
What is the corporation tax rate in the UK?
The UK currently operates a main corporation tax rate of 25%, with reduced rates available for some smaller companies.
What is a CT600?
A CT600 is the corporation tax return submitted to HMRC each year by UK companies.
Can you help with R&D tax credits?
Yes. We work with specialist firms experienced in both SME and RDEC R&D tax relief claims.
What happens if HMRC opens a tax enquiry?
Specialist advisers can manage correspondence, prepare supporting documentation and negotiate directly with HMRC on your behalf.
Do you provide international tax advice?
Yes. Several partner firms advise on cross-border structures, transfer pricing, overseas subsidiaries and double taxation issues.
You may also need
Businesses requiring one accounting or advisory service often need support across related compliance and tax areas.
Statutory Accounts
Preparation under FRS 102, FRS 105 and IFRS for UK companies and groups.
Audit Services
Statutory and voluntary audits for UK companies, charities and groups.
VAT Returns & Advisory
VAT registration, MTD compliance and specialist VAT advisory support.
Payroll & Employer Compliance
RTI payroll, pensions, P11Ds and employer tax compliance services.
Relevant search terms we serve
Find a qualified firm for this service
Complete a short brief and we will identify the most appropriate partner firm.
Request a Free Consultation ›