Corporation Tax Services UK for Limited Companies and SMEs

Expert corporation tax accountants helping UK companies reduce tax liabilities, file CT600 returns, and stay fully compliant with HMRC.

At Audit Consulting Group, we specialise in Corporation Tax and provide top‑quality corporate income tax services to businesses across the United Kingdom. If you’re searching for a reliable corporation tax service partner, you’ve come to the right place. We make complex tax matters simple and manageable, so you can focus on your growth.

Corporation Tax Services for UK Companies

We provide comprehensive corporation tax services for limited companies, SMEs, and growing businesses across the UK. Our corporation tax accountants handle everything from CT600 preparation and filing to tax planning and HMRC compliance support.

Our services include corporation tax calculations, identifying allowable expenses, claiming reliefs such as R&D tax credits and capital allowances, and ensuring deadlines are met.

Who Needs Corporation Tax Services in the UK

Our corporation tax services are ideal for:

• Limited companies
• Startups and growing businesses
• SMEs with increasing profits
• Companies claiming R&D tax credits
• Businesses investing in equipment or machinery
• Groups with multiple companies
• UK subsidiaries of overseas companies

Why our Corporation Tax Service Stands Out

Every business is unique, especially in how taxation affects profits and growth. At Audit Consulting Group, our approach to corporate income tax services is tailored, practical, and deeply experienced:

• Dedicated UK tax specialists with years of experience in UK Corporation Tax legislation.
• Personal attention: one‑on‑one support through each step.
• Transparent fees: no surprises, clear pricing.
• A focus on reducing your tax liability, maximising reliefs, credits, and allowances.
• Proactive planning: we help you prepare for the next tax year as soon as this one ends.

Our clients trust us because we combine technical expertise with an approachable human touch. Whether you’re a startup, SME, or multinational, our Corporation Tax service adapts to your scale.

CT600 Corporation Tax Return Filing

Every UK limited company must file a CT600 corporation tax return with HMRC. Our corporation tax accountants prepare and submit your CT600 accurately, ensuring all reliefs and deductions are applied.

We also review prior year returns, identify missed allowances, and correct any compliance risks before submission.

Corporation Tax Deadlines UK

Corporation Tax must usually be paid within 9 months and 1 day after the end of your accounting period. Your CT600 return must be filed within 12 months.

Missing deadlines can lead to penalties and interest. Our corporation tax service ensures your company meets all HMRC deadlines and avoids unnecessary costs.

HMRC Corporation Tax Penalties

HMRC may apply penalties for late corporation tax returns:

• £100 for late filing
• Additional £100 after 3 months
• 10% of unpaid tax after 6 months
• Additional 10% after 12 months

Working with a corporation tax accountant helps reduce compliance risks and avoid penalties.

Our Process: How We Deliver Your Corporation Tax Service

1. Discovery & onboarding
   We meet (remotely or in person) to learn about your business, its structure, revenue, expenses, and future plans.
2. Review & risk assessment
   We check previous filings, historical allowances claimed, and any potential issues.
3. Tax planning & strategy
   We map out tax-saving opportunities like R&D claims, losses, capital expenditure, or group relief.
4. Preparation of tax return
   We draft and review your CT600 and supporting schedules, ensuring accuracy and completeness.
5. Filing & submission
   We file electronically, monitor HMRC status, and manage any follow‑up queries.
6. Post‑submission support
   If HMRC has questions or opens an enquiry, we liaise for you. We’re with you throughout.
7. Planning for next year
   We review your current financials to anticipate next year’s tax, offer budgeting advice, and suggest actions now to reduce future liabilities.

Consistent communication, prompt support, and clear written advice mean you’re always in control and informed.

Real-World Cases: How We’ve Helped Clients Save

Case Study 1: Tech Startup with R&D Relief (BrightApps Ltd)

BrightApps Ltd, a UK-based software company with £420,000 annual turnover, invested heavily in product development but had never claimed R&D tax relief.

What we did:

• Identified qualifying R&D expenditure of £210,000
• Prepared and submitted R&D claim
• Adjusted CT600 and supporting documentation

Result:

• Secured £75,000 R&D tax credit
• Reduced Corporation Tax liability by £18,750
• Improved cashflow by over 20% in that quarter
• Enabled hiring of 2 additional developers

Case Study 2: Manufacturing SME (GreenFoods UK)

GreenFoods UK, with £1.2M annual revenue, expanded operations and invested in machinery worth £480,000.

What we did:

• Applied capital allowances including AIA
• Structured asset claims efficiently
• Reviewed prior-year missed allowances

Result:

• Claimed £480,000 in capital allowances
• Reduced taxable profit by £310,000
• Saved £120,000 in corporation tax over 2 years
• Improved reinvestment capacity

Case Study 3: Group Restructuring (Euro-Trade Plc)

Euro-Trade Plc, operating across the UK and EU with £8.5M group turnover, required restructuring for tax efficiency.

What we did:

• Implemented group relief strategy
• Reallocated losses across subsidiaries
• Aligned intercompany transactions

Result:

• Reduced group-wide tax exposure by £250,000+
• Offset £1.1M in losses against profits
• Improved long-term tax efficiency

How Much Do Corporation Tax Services Cost

Corporation tax service fees depend on company size and complexity. Simple CT600 filings for small companies typically start from competitive fixed fees, while larger businesses requiring tax planning, R&D claims, or group structures may require tailored pricing.

We provide transparent fixed quotes with no hidden costs.

What Clients Say: Reviews & Testimonials

“Audit Consulting Group made Corporation Tax painless. Their team spotted reliefs we hadn’t claimed for years—even for a small digital agency like ours. Friendly, clear, and saving us a fortune.”
— Emily, Co‑Founder of StudioVibe

“We switched to Audit Consulting Group mid‑year and immediately saw the benefit. They responded to every HMRC question calmly and quickly. We feel much more confident heading into our next tax year.”
— Jack, Managing Director at HarbourWorks Ltd

“From the first meeting, I knew I was in safe hands. Their consultants are real humans—not robots—translating complex tax issues into plain English. We saved nearly £90k in corporation tax this year.”
— Sarah, Finance Director of InnovateBuild

We’re proud to receive such feedback. It reflects our commitment to delivering not just a service, but real, measurable value.

Corporation Tax FAQ UK

What is Corporation Tax in the UK?

Corporation Tax is a tax paid by UK limited companies on their profits, including trading income, investments, and asset disposals. The rate depends on your company’s taxable profits.

Who needs to pay Corporation Tax in the UK?

All UK limited companies and some organisations (including clubs and associations) must pay Corporation Tax on profits. Sole traders and partnerships do not pay Corporation Tax but instead pay income tax.

What is a CT600 form?

The CT600 is the official Corporation Tax return that every UK company must submit to HMRC annually. It includes financial data, tax calculations, and claimed reliefs.

When is Corporation Tax due?

Corporation Tax must usually be paid 9 months and 1 day after the end of your accounting period, while the CT600 return must be filed within 12 months.

What happens if you miss the Corporation Tax deadline?

Late filing or payment can result in penalties, interest charges, and increased HMRC scrutiny. Using a corporation tax accountant helps avoid these risks.

How much does a corporation tax accountant cost in the UK?

Fees typically start from a fixed rate for simple CT600 filings and increase depending on complexity, company size, and additional services such as tax planning or R&D claims.

Can a corporation tax accountant reduce my tax bill?

Yes. Accountants identify allowable expenses, tax reliefs, and planning opportunities that legally reduce your corporation tax liability.

What are R&D tax credits?

R&D tax credits allow companies to claim relief on qualifying innovation and development costs, reducing tax or generating cash repayments.

Do I need help with CT600 filing?

If your company has multiple income streams, expenses, or complex transactions, using a corporation tax accountant ensures accuracy, compliance, and tax efficiency.

Can you help if HMRC opens an enquiry?

Yes. We handle HMRC enquiries, prepare responses, and represent your business to resolve issues efficiently and minimise penalties.

More About Audit Consulting Group

• Established expertise: Our team comprises qualified Chartered Accountants and tax professionals with decades of UK Corporation Tax experience.
• Human-first approach: We use approachable language (no clogged jargon) and care about your business goals.
• Ongoing partnership: We’re not one-off filing agents—we plan together annually to reduce liability and build your resilience.
• Tech-enhanced: We use secure, efficient systems for documents, filings, billing, and communication—safe and easy for you.

How to Get Started

• Arrange a free initial consultation call or meeting.
• You supply basic financial info (profit & loss, balance sheet, previous CT600).
• We review and present a plan highlighting where we can add value.
• You confirm engagement, and we proceed.
• File by deadline, manage HMRC contact, and plan ahead.

We make the entire process simple and comfortable for you.

Why Choose Us for Corporation Tax Service?

✅ Deep UK Tax Knowledge

Our consultants are up to speed on the latest UK Corporation Tax legislation, reliefs, and rates—including changes in R&D credits and capital allowance rules.

✅ Client-Focused Experience

You’re not a number. Our approach includes regular email updates, friendly support, and fast response to your questions.

✅ Proven Savings

We consistently deliver savings from R&D claims, capital allowances, or loss reliefs. Our cases show real monetary benefit.

✅ Risk Mitigation

We use a robust compliance process to help you avoid penalties, delays, or interest from HMRC.

✅ Future‑Oriented Planning

We help you forecast future tax liability, plan investments, and make decisions that reduce future burdens.

Related Accounting Services

We also support businesses with:

• Company accounts preparation
• VAT returns and compliance
• Bookkeeping services
• Payroll services
• Management accounts
• Business tax planning

This allows us to provide complete accounting and tax support for UK companies.

Our Approach Summarised

Avoid HMRC penalties, reduce your corporation tax bill, and ensure your CT600 is filed correctly. Speak with our corporation tax accountants today.

Book Your Free Corporation Tax Consultation

Speak with a corporation tax accountant today and discover how much tax your company could save. We offer fixed pricing, fast turnaround, and full HMRC compliance support.

Final Thoughts

Corporation Tax doesn’t have to be a burden. With a smart, well‑executed corporation tax service, you gain not just compliance, but opportunity. At Audit Consulting Group, we provide expert corporate income tax services in plain English, with real savings and peace of mind. Let us help you keep more of your profits where they belong—in your business.

Thank you for considering Audit Consulting Group as your Corporation Tax partner. We look forward to working with you!

Official HMRC Corporation Tax Resources

For transparency and compliance, you can review official UK government guidance:

Corporation Tax overview:
https://www.gov.uk/corporation-tax

File your Company Tax Return (CT600):
https://www.gov.uk/file-your-company-accounts-and-tax-return

Corporation Tax rates:
https://www.gov.uk/corporation-tax-rates

Capital allowances guidance:
https://www.gov.uk/capital-allowances

Research and Development (R&D) tax relief:
https://www.gov.uk/guidance/corporation-tax-research-and-development-rd-relief

Corporation Tax deadlines:
https://www.gov.uk/pay-corporation-tax

Corporation Tax Services Pricing for UK Companies

Estimate corporation tax service costs in the UK with clear and affordable pricing. Our corporation tax services include tax calculations, HMRC submissions, and compliance support for limited companies. Use our pricing estimator to understand corporation tax accountant costs and avoid overpaying for essential tax services.