Best Internal Audit Services Companies in Leeds

If you run a business in Leeds, you already know how quickly things can move. Growth is great, new contracts are exciting, but with that comes risk, regulation, and the occasional blind spot. That is where internal audit steps in. Not as a box ticking exercise, but as a way to really understand what is working, what is not, and what might cause trouble later on.

In this article, we are going to look at a list of internal audit services companies in Leeds. Some are larger regional firms with dedicated risk teams, others are more specialist consultancies focused purely on governance and controls. The aim is simple – to give you a clearer picture of who is out there and what they actually bring to the table, beyond the usual polished promises.

1. Acumon

Acumon is a UK based firm of chartered accountants and auditors providing audit, tax, accounts and advisory services. Within their service lines, internal audit sits under Risk and Tech Assurance, where they support CFOs and finance directors with governance, compliance and risk management. Their work in this area covers internal audit, IT risk, cybersecurity and broader control reviews. Alongside that, they act as external auditors for UK PLCs, limited companies, charities and international subsidiaries, which means they are used to working within formal reporting and regulatory frameworks.

Although their office is in London, they work with businesses across the UK, including organisations in Leeds. For companies in Leeds that need internal audit services, they provide structured support around internal controls, governance processes and risk oversight without requiring a fully in house team. Because they also deliver tax, accounts, payroll and company secretarial services, internal audit discussions can be aligned with day to day financial operations rather than treated as a separate compliance exercise.

Key Highlights:

• Registered audit firm with UK based team
• Risk and Tech Assurance services including internal audit
• Experience working with companies, charities and group subsidiaries
• Support for governance, compliance and control reviews
• Integrated approach across audit, tax and advisory

Services:

• Internal audit and governance reviews
• External audit
• Risk management and IT risk
• Accounts preparation and bookkeeping
• Tax compliance and planning
• Payroll services
• Company secretarial support

Contact information:

• Website: acumon.com
• Phone: 020 8567 3451
• E-mail: [email protected]
• Address: 1-2 Craven Road, Ealing, London, W5 2UA, UK

2. S&W

S&W operates from its Leeds office and provides assurance, accounting, tax and advisory services to a wide range of organisations. Their audit and assurance teams work with mid market corporates, SMEs, multinational groups and not for profit organisations. Alongside statutory audit, they also deliver risk advisory services, forensic work and restructuring support. Internal audit and business controls form part of their broader risk advisory offering, where they review systems, processes and regulatory compliance within different sectors.

From their Leeds base, S&W supports businesses across Yorkshire and beyond. For organisations in Leeds that need structured internal audit services, they combine financial reporting expertise with governance and risk advisory input. Their approach connects accounting, systems and operational controls, which can be useful for companies that want more clarity around how their internal processes are working in practice.

Key Highlights:

• Leeds city centre office
• Audit and assurance services for varied business sizes
• Risk advisory and forensic capabilities
• Corporate finance and restructuring support
• Experience across multiple sectors

Services:

• Internal audit and risk advisory
• External audit and assurance
• Business tax and VAT
• Accounting advisory
• Corporate finance and transactions
• Forensic accounting
• Restructuring services

3. Grant Thornton

Grant Thornton operates from its Leeds office in City Square House and provides audit, tax and advisory services across Yorkshire. Their teams work with businesses in financial services, healthcare, technology and other sectors. Audit and assurance is a core part of their offering, supported by specialist advisory teams in areas such as restructuring, forensics and financial services advisory. Internal audit and governance support typically sit within their advisory and risk related services, where they review controls, compliance frameworks and financial processes.

With a strong presence in Leeds, Grant Thornton works closely with organisations that operate in complex or regulated environments. For companies seeking internal audit services in the region, their teams can assist with reviewing internal controls, assessing risk management structures and providing independent oversight. Their work often connects audit, tax and advisory perspectives, which helps businesses look at internal audit not just as a compliance task but as part of overall financial management.

Key Highlights:

• Leeds based office serving Yorkshire
• Audit and assurance as a core service line
• Sector experience including financial services and healthcare
• Advisory teams covering risk, forensics and restructuring
• Support for both growing and established organisations

Services:

• Internal audit and governance reviews
• External audit and assurance
• Tax advisory and compliance
• Financial services advisory
• Restructuring and insolvency support
• Forensic and investigation services

4. BDO 

BDO Leeds operates from its office on Wellington Street and works with businesses across Yorkshire and the North East, focusing on audit, assurance, tax and advisory services. Their Business Assurance and Digital and Risk Advisory teams cover areas that link directly to internal audit, including controls, risk review and governance support. Alongside this, they provide corporate tax, restructuring, transaction services and outsourcing, which means internal audit conversations often sit within a wider review of financial reporting and operational processes.

Based in Leeds, they work with organisations ranging from private individuals and start ups through to listed and mid market companies. For businesses in Leeds that need internal audit support, BDO Leeds connects assurance work with risk advisory and financial oversight. Their structure as part of a national and international network also means that internal audit and governance reviews can be aligned with wider group or cross border requirements where needed.

Key Highlights:

• Leeds office serving Yorkshire and the North East
• Business Assurance and Digital and Risk Advisory services
• Work with listed, mid market and growing businesses
• Part of a national and international network
• Experience across multiple sectors

Services:

• Internal audit and risk advisory
• External audit and assurance
• Corporate tax and employment tax
• Business restructuring
• Corporate finance and transaction services
• Business services and outsourcing
• Forensic accounting and valuation

5. RSM UK

RSM UK provides audit, tax and consulting services to organisations across the country, with internal audit typically sitting within their risk and governance offering. Their services extend beyond statutory audit into areas such as forensic investigations, deal services, restructuring and business transformation. Internal audit work often focuses on reviewing governance frameworks, testing internal controls and supporting finance teams with oversight and compliance responsibilities.

Working with a wide range of businesses, from growing companies to more established groups, RSM UK links internal audit with broader finance function support and risk management. For organisations in Leeds seeking internal audit services, their approach usually combines audit insight with consulting input, especially where companies are navigating change, regulatory pressure or operational adjustments.

Key Highlights:

• National audit, tax and consulting firm
• Risk and governance services including internal audit
• Forensic and investigation capabilities
• Deal and restructuring services
• Finance function and business transformation support

Services:

• Internal audit and governance review
• External audit
• Risk and compliance advisory
• Forensic and investigation services
• Deal advisory
• Restructuring
• Tax services

6. Sedulo

Sedulo provides audit and assurance services with a focus on financial scrutiny, compliance and internal review. Their audit team works across private, public and not for profit organisations, and their assurance services extend beyond statutory audit into internal compliance, due diligence and specialist sector reviews. Internal audit forms part of their wider assurance offering, particularly where organisations need structured examination of controls, reporting and financial systems.

With a presence that includes a Leeds office, Sedulo supports businesses that require both external audit and internal oversight. Their work often involves reviewing systems, assessing compliance requirements and providing feedback on areas where processes can be tightened. For companies in Leeds, this can mean using internal audit not only to meet formal requirements but also to gain clearer visibility over financial and operational controls.

Key Highlights:

• Audit and assurance focused practice
• Leeds office among national locations
• Experience across private, public and not for profit sectors
• Internal compliance and due diligence support
• Work with group and international audit requirements

Services:

• Internal audit
• Statutory audit
• Assurance and internal compliance
• Due diligence assignments
• Grant and funder audits
• Charity independent examinations
• Client asset audits for regulated firms

7. Forvis Mazars 

Forvis Mazars operates in the UK as part of a global organisation providing audit, assurance, tax and advisory services. In Leeds, their teams focus on supporting businesses across a range of sectors, including financial services, manufacturing, technology and the public sector. Internal audit sits within their wider audit and assurance and consulting work, where they look at governance structures, risk management processes and internal control frameworks. Their services also connect with sustainability, ESG and financial advisory, which can shape how internal audit reviews are planned and delivered.

Working from their Leeds office as part of a broader UK network, they support organisations that need structured oversight of controls and compliance. For companies in Leeds, internal audit is often linked to regulatory expectations, shareholder requirements and operational complexity. Forvis Mazars combines internal audit with tax, accounting and advisory support, so governance reviews are not handled in isolation but alongside wider business considerations.

Key Highlights:

• Leeds office within a global network
• Audit and assurance services across sectors
• Internal audit linked to governance and risk
• Advisory and consulting capabilities
• Experience with regulated and complex organisations

Services:

• Internal audit
• External audit and assurance
• Tax services
• Consulting and advisory
• Financial advisory
• Sustainability and ESG support
• Accounting and outsourcing

8. Azets 

Azets Leeds provides accountancy, audit, tax and advisory services to businesses and individuals across Yorkshire. Their audit and assurance work includes reviewing financial reporting and compliance processes, which often overlaps with internal audit activity. In addition to statutory audit, they offer forensic accounting, restructuring and technical accounting support. This wider service range means internal control and governance discussions are usually connected to practical finance and operational matters.

From their King Street office in Leeds, they work with SMEs, larger corporations and owner managed businesses across different sectors. For organisations that need internal audit input, Azets links audit and advisory support with payroll, tax and corporate finance services. Their local presence combined with a national network allows them to support Leeds based businesses while drawing on broader technical expertise when required.

Key Highlights:

• Leeds based accountancy and advisory team
• Audit and assurance services
• Forensic and restructuring support
• Work with SMEs and larger organisations
• Part of a wider UK and international network

Services:

• Internal audit and assurance support
• External audit
• Tax advisory and compliance
• Payroll services
• Corporate finance
• Forensic accounting
• Restructuring and insolvency

9. PKF Littlejohn 

PKF Littlejohn provides internal audit and controls services with a clear focus on governance, risk and regulatory compliance. Their internal audit team delivers outsourced and co-sourced internal audit services, often working with regulated and complex businesses such as those in financial services. They support organisations in setting up internal audit functions, acting as Head of Internal Audit, or assisting in-house teams with specialist expertise in areas like IT and actuarial review.

Through their Leeds office, they offer internal audit services to businesses across the region, as well as nationally. Their approach includes ad hoc control reviews, training for boards and management, and support for Heads of Internal Audit. For companies in Leeds that require independent assurance over controls, PKF Littlejohn focuses on practical internal audit planning and delivery, helping organisations align governance frameworks with operational realities.

Key Highlights:

• Dedicated internal audit and controls service line
• Outsourced and co-sourced internal audit models
• Experience with regulated and financial services firms
• Support for Heads of Internal Audit and audit committees
• Leeds office with national reach

Services:

• Outsourced internal audit
• Co-sourced internal audit
• Ad hoc control assurance reviews
• Internal audit training
• Support to Heads of Internal Audit
• IT assurance
• Governance and risk advisory

10. DSC Chartered Accountants

DSC Chartered Accountants provides audit and assurance services from its Leeds office, alongside locations in Harrogate and Skipton. Their audit team handles statutory audits, internal audits and specialist assignments for sectors such as charities, pension schemes, housing associations, solicitors and clubs. Internal audit work is focused on reviewing systems, identifying areas of risk and looking at how financial processes are working in practice. They also review profit and cash flow projections, linking audit findings to forward planning and business risk discussions.

Working with businesses across Leeds and the surrounding area, they approach internal audit as part of a broader financial review rather than a stand alone exercise. For organisations that need independent oversight of controls or compliance, they provide structured internal audit support while also advising on improvements to procedures and efficiency. Their service line sits within a wider accountancy practice, so audit findings can be considered alongside tax and general accounting matters where relevant.

Key Highlights:

• Leeds based audit and assurance team
• Statutory and internal audit services
• Experience with charities, pension schemes and solicitors
• Review of systems, controls and projections
• Offices across West Yorkshire

Services:

• Internal audit
• Statutory audit
• Specialist audits for regulated sectors
• Systems and control reviews
• Risk identification
• Financial projections review

11. AAB 

AAB Leeds delivers audit and assurance services as part of a wider professional offering that includes tax, corporate finance, payroll and business advisory. Their audit work covers statutory audit and assurance, with internal controls and compliance forming part of that process. Internal audit activity is generally linked to reviewing financial reporting, governance and operational processes, particularly for businesses that require ongoing oversight rather than a one off review.

Operating from their office on St Paul’s Street, they work with businesses across Leeds and the wider Yorkshire region, including sectors such as construction, property, public sector and not for profit. For organisations seeking internal audit services in Leeds, AAB combines audit with restructuring, ESG and advisory support. This means internal audit discussions often sit within broader conversations about risk, growth and financial management.

Key Highlights:

• Leeds office serving Yorkshire businesses
• Audit and assurance as part of full service offering
• Work with public sector and not for profit organisations
• Corporate finance and restructuring support
• Member of an international accounting network

Services:

• Internal audit and assurance
• Statutory audit
• Tax advisory and compliance
• Corporate finance
• Payroll and employment services
• Restructuring and recovery
• Business advisory

12. Thomas Coombs

Thomas Coombs provides audit services from its Leeds base, working with SMEs, charities, overseas owned UK subsidiaries and sector specific organisations. Their audit department supports both statutory requirements and internal reviews of business systems. Internal audit and control assessment form part of their approach, with a focus on examining accounting procedures and identifying where internal systems can be improved.

From their office in Thorpe Park, Leeds, they work with businesses across different industries including engineering, property, technology and hospitality. For companies that need internal audit support, Thomas Coombs combines audit with advisory and outsourced services, allowing internal control findings to be discussed alongside wider business operations. Their audit work often includes feedback on efficiency and benchmarking against industry indicators, giving management clearer insight into how systems are performing.

Key Highlights:

• Leeds based audit practice
• Experience with SMEs and overseas owned subsidiaries
• Specialist sector audits including charities and solicitors
• Focus on internal systems and controls
• Registered to carry out audit work in the UK

Services:

• Internal audit
• Statutory audit
• Specialist sector audits
• Systems and control review
• Advisory services
• Outsourced services
• Corporate finance and tax planning

13. Armstrong Watson 

Armstrong Watson operates from its Leeds office on South Parade, providing audit and assurance alongside tax, corporate finance, restructuring and business advisory services. Their audit team works with privately owned businesses across sectors such as manufacturing, digital and technology, property, leisure, retail, legal and charities. Internal audit and assurance activity typically sits within their broader audit and compliance work, where they review financial reporting, internal controls and governance processes. Alongside statutory audit, they support clients with cloud accounting systems, VAT, payroll and financial planning, which means audit findings are often discussed in the context of day to day operations rather than in isolation.

Working with businesses across Leeds and West Yorkshire, they position themselves as regional advisers with access to wider technical resources. For organisations in Leeds that need internal audit services, Armstrong Watson connects control reviews with restructuring, finance raising and strategic advice. This can be relevant for companies experiencing change, growth or financial pressure, where internal audit is part of maintaining oversight and managing risk across different areas of the business.

Key Highlights:

• Leeds office serving West Yorkshire
• Audit and assurance services for privately owned businesses
• Experience across multiple sectors including legal and charities
• Restructuring and insolvency capability
• Cloud accounting and cyber security support

Services:

• Internal audit and assurance
• Statutory audit
• Corporate taxation and VAT advice
• Corporate finance and funding advisory
• Restructuring and insolvency
• Payroll services
• Financial planning and wealth management

Conclusion

Choosing an internal audit provider in Leeds is not really about finding a firm with the longest service list. It is more about understanding how they think, how they approach risk, and whether they actually get how your business works on a practical level. Some companies lean heavily into regulated sectors and formal governance structures. Others work closely with owner managed businesses where processes are still evolving and internal audit needs to feel proportionate, not overwhelming.

Leeds has a strong mix of regional firms and larger networks, which gives businesses a bit of flexibility. You can work with a practice that feels close and hands on, or one that draws on wider national or international resources. Neither option is automatically better. It depends on your size, your sector and honestly, how complex your operations have become.

Internal audit, when done properly, is not just a compliance task. It is a way of stepping back and asking a few uncomfortable but necessary questions about controls, reporting and accountability. The firms in Leeds offering these services approach challenges in slightly different ways, but the common thread is the same – helping organisations understand their risks before those risks turn into real problems. And in the current climate, that kind of clarity is not a bad place to start.