audit
July 4, 2025

Top 10 Best Audit Support Companies in the UK Right Now

Running a business in the UK today demands more than simply keeping your books in order. With evolving financial regulations, growing expectations for transparency, and the constant push towards digital transformation, businesses need reliable partners to support their audit processes. Whether you’re a multinational enterprise or a local firm, the right audit support company can save you time, reduce stress, and help you remain compliant while unlocking valuable business insights.

Curious about who’s leading the game? Here’s our look at the Top 10 Best Audit Support Companies in the UK right now, and what sets each one apart.

1. Deloitte UK

Deloitte UK maintains its reputation as one of the leading providers of audit support services. With a combination of cutting-edge technology and extensive industry knowledge, they ensure audits are handled meticulously and efficiently.

  • Headquarters: London
  • Key Services: Financial audits, sustainability reporting, regulatory assurance
  • Standout Feature: Powerful analytics and proactive risk detection

Businesses often choose Deloitte for their innovative approach and the confidence they bring to complex auditing scenarios.

2. PwC UK

PricewaterhouseCoopers (PwC) UK offers tailored audit services designed to deliver deeper insights rather than just ticking compliance boxes. They focus on helping clients strengthen their financial credibility while spotting strategic opportunities.

  • Headquarters: London
  • Key Services: Statutory audits, ESG assurance, internal control reviews
  • Standout Feature: Bespoke solutions and forward-thinking methodology

Companies trust PwC for their commitment to quality and their ability to simplify complicated financial landscapes.

3. EY UK

Ernst & Young UK blends technology and deep sector knowledge to deliver audits that bring genuine value. Their services extend beyond routine checks, focusing on helping organisations make informed business decisions.

  • Headquarters: London
  • Key Services: Assurance services, fraud detection, technology-driven audits
  • Standout Feature: Advanced digital audit platforms for efficiency and transparency

EY’s approach is especially appreciated by firms operating in heavily regulated sectors like financial services and healthcare.

4. KPMG UK

KPMG UK continues to evolve its audit services, integrating modern tools such as their proprietary KPMG Clara platform. This technology allows for greater collaboration and clearer communication during audit engagements.

  • Headquarters: London
  • Key Services: External audits, digital compliance, enterprise risk management
  • Standout Feature: Strong emphasis on technology and data-driven insights

Businesses value KPMG’s attention to detail and commitment to keeping clients informed at every stage.

5. Grant Thornton UK

Grant Thornton UK remains a solid choice for mid-market and growing enterprises. Known for their personal touch, they balance technical expertise with practical guidance tailored to individual business needs.

  • Headquarters: London
  • Key Services: Financial statement audits, regulatory compliance checks, risk evaluations
  • Standout Feature: Collaborative service style and mid-market focus

Many businesses prefer Grant Thornton’s flexible and client-friendly approach over larger firms’ sometimes rigid processes.

6. CapacityHive

CapacityHive is rapidly emerging as a standout player in the UK’s audit support industry. Though not as large as some big-name competitors, they’re carving a niche by delivering reliable, tech-enabled support to smaller and medium-sized businesses.

CapacityHive is gaining recognition for making audits less stressful and more streamlined, particularly for businesses looking to avoid the hefty fees of the bigger firms.

7. BDO UK

BDO UK blends local understanding with international resources, making them a favourite for both UK-based and global enterprises. Their auditors focus on building strong relationships, ensuring that clients feel supported throughout the process.

  • Headquarters: London
  • Key Services: Audit & assurance, advisory services, governance reviews
  • Standout Feature: High partner involvement and tailored services

BDO stands out for delivering high-quality audits without the feel of a corporate machine.

8. Mazars UK

Mazars UK is known for their strong presence in the European market, but they’ve also secured a firm foothold in the UK with their personalised audit services. They cater particularly well to companies operating across borders.

  • Headquarters: London
  • Key Services: External audits, sustainability assurance, internal controls assessments
  • Standout Feature: Client-centric approach and ethical auditing practices

Businesses seeking a partner who blends technical skill with a genuine commitment to ethics often turn to Mazars.

9. RSM UK

RSM UK primarily serves the middle market, providing practical solutions and insights that go beyond compliance. Their audit professionals work to understand each client’s unique circumstances.

  • Headquarters: London
  • Key Services: Audit & assurance, business advisory, risk management consulting
  • Standout Feature: Clear communication and proactive problem-solving

RSM’s clients appreciate their dedication to adding value, not just fulfilling statutory requirements.

10. Baker Tilly UK

Baker Tilly UK offers robust audit support services to businesses of all sizes, combining the flexibility of a smaller firm with the resources of a global network. They excel in delivering industry-specific knowledge.

  • Headquarters: London
  • Key Services: Financial audits, advisory services, regulatory reporting
  • Standout Feature: Strong client relationships and adaptability

Businesses choose Baker Tilly for their responsiveness and ability to tailor services to evolving needs.

What to Consider When Choosing an Audit Support Firm

Choosing the right audit support partner in the UK isn’t simply about picking the biggest name. Instead, consider:

✅ How well they understand your industry
✅ Whether they use modern technology to streamline audits
✅ The level of personal attention they offer
✅ Pricing transparency and cost-effectiveness
✅ Their reputation for integrity and reliability

While the “Big Four” dominate the landscape, innovative firms like CapacityHive are proving that exceptional service doesn’t always come with a premium price tag.

Final Thoughts

Audit support in the UK today goes far beyond just meeting compliance deadlines. It’s about reducing risks, gaining business insights, and creating trust with stakeholders. Whether you need a large, established firm or an agile partner like CapacityHive, the UK’s audit support market offers excellent choices for every type of business.