Tax Due Diligence Companies in Birmingham: Firms and Services Guide (2026)
AC
Acumon Chartered Accountants·12 min read
Tax due diligence can uncover historic liabilities, compliance gaps and transaction-specific tax risks before a business changes hands. This guide covers firms that provide tax due diligence services to Birmingham businesses, including locally based transaction tax teams and UK-wide advisers. The list is a practical overview rather than a ranking, with differences in deal size, tax specialisms and wider transaction support.
Acumon
Acumon is a UK firm of chartered accountants providing tax due diligence services to companies and organisations involved in mergers, acquisitions and business sales.
The firm works with organisations ranging from growing owner-managed businesses through to larger corporate groups. Tax due diligence engagements are led by in-house Chartered Tax Adviser expertise and cover the material taxes a UK business faces, services are provided to clients across the UK, including in Birmingham.
Acumon’s tax due diligence identifies tax exposures before they become the buyer’s problem or derail a seller’s transaction. When shares are acquired, the buyer inherits the company’s tax history, including potential HMRC enquiries into earlier periods that can bring interest and penalties. The review quantifies those risks so they can be addressed through price adjustments, warranties, indemnities, tax covenants or changes to deal structure.
Reviews span corporation tax (compliance history, computations, losses and reliefs, and the reasonableness of provisions); VAT (registration, returns, partial exemption, and the treatment of the transaction itself); PAYE and National Insurance (employment status, benefits, IR35, termination payments and share schemes); capital gains and chargeable gains within the company; stamp duty and Stamp Duty Land Tax; and, where relevant, inheritance tax and the Annual Tax on Enveloped Dwellings (ATED) for property-holding companies. Transfer pricing and tax-driven structures that could unwind are also assessed. Findings are categorised by type of risk (compliance, HMRC enquiry, unexpected liability, structural/degrouping, and planning arrangements) and translated into clear, priced conclusions that feed directly into negotiation and contractual protection. Both buy-side and vendor-side reviews are available and integrate with financial due diligence.
Tax Due Diligence Capabilities:
Acumon provides tax due diligence services across a range of organisational structures and transaction types.
These include:
UK limited companies and corporate groups
Public Interest Entities (PIEs) and regulated organisations
UK subsidiaries of international groups
Owner-managed businesses preparing for sale or acquisition
Property-holding companies and investment vehicles
These services support groups and businesses that need clear identification of tax risk as part of UK and cross-border transactions.
Regulatory Licences and Registrations:
Acumon holds several audit registrations that enable it to support organisations operating across multiple jurisdictions.
These include:
UK statutory audit registration
Public Interest Entity (PIE) audit licence
Jersey audit licence
Isle of Man audit licence
Cayman Islands audit licence
British Virgin Islands audit licence
These registrations allow the firm to provide audit services to groups that include entities in both the UK and key international financial centres.
Core Services:
In addition to statutory external audit, Acumon provides a range of services that support financial reporting and governance.
These include:
Statutory external audit
Group and subsidiary audits
Public Interest Entity (PIE) audits
Charity and not-for-profit audit
Audit of international group structures
Internal audit and governance reviews
Risk management and compliance support
Audit work is often delivered alongside discussions with management and boards regarding financial reporting processes and governance frameworks.
Many organisations initially encounter statutory audit requirements as they grow and exceed the audit exemption thresholds set out in the Companies Act.
Acumon works with businesses that are:
Approaching their first statutory audit
Preparing for external investment
Expanding into international markets
Operating within corporate group structures
Early engagement with an audit firm can help ensure that financial reporting systems and documentation are aligned with statutory audit requirements.
Address: 1-2 Craven Road, Ealing, London, W5 2UA, UK
BDO
BDO has a substantial Birmingham practice at Two Snowhill, supported by corporate tax and transaction services specialists. Birmingham-based tax partners advise on acquisition structuring, disposals and tax due diligence, including work for private equity-backed businesses, management teams and corporate buyers.
Its transaction tax capability can be combined with financial due diligence and wider deal advisory work. Local specialists have experience across sectors including technology, industrials, manufacturing, healthcare, energy and professional services, which can be useful where the tax review needs to reflect sector-specific transaction issues.
Key Facts:
Ideal for: Mid-market companies, private equity and corporate acquirers
Core services: Tax due diligence, transaction tax, acquisition structuring, financial due diligence
Specialisation: Buy-side and sell-side transaction support
Location: Two Snowhill, Birmingham
Contact Information:
Website: www.bdo.co.uk
LinkedIn: www.linkedin.com/company/bdo-llp
Instagram: www.instagram.com/bdo_uk
Address: Two Snowhill, Birmingham, B4 6GA, United Kingdom
Phone: 0121 352 6200
Bishop Fleming
Bishop Fleming operates from Colmore Row in Birmingham and has been expanding its corporate tax and transaction support capability in the city. The firm’s transaction tax service includes tax due diligence, documentation reviews, pre-transaction planning, restructuring advice and support with management buy-outs and buy-ins.
Tax specialists work alongside the corporate finance team, which can also provide financial and tax due diligence for acquisitions. The Birmingham practice has continued adding senior corporate tax and transaction professionals, giving businesses in the West Midlands access to a growing local deals team.
Key Facts:
Ideal for: SMEs, owner-managed businesses, mid-market corporates and private equity
Core services: Tax due diligence, transaction structuring, corporate finance, restructuring
Transaction support: Buy-side, sell-side, MBO and MBI advice
RSM’s Birmingham office includes specialist transaction tax expertise. Its Head of Transactions Tax works between Birmingham and London and advises investors, businesses and management teams on tax due diligence, deal structuring and related M&A matters.
The firm’s transaction tax work can extend beyond the initial review of historic liabilities. Support may continue into acquisition structuring, post-deal tax actions, refinancing, bolt-on acquisitions, restructuring and exit planning. This gives clients the option of keeping transaction tax advice connected with later stages of the investment lifecycle.
Key Facts:
Ideal for: Corporates, investors, private equity and management teams
Core services: Tax due diligence, deal structuring, M&A tax advisory
Transaction support: Acquisitions, exits, refinancing and post-deal planning
PKF Smith Cooper has a Birmingham office and a tax team that works alongside its corporate finance and transaction advisory specialists. Its transactional tax work covers business acquisitions, sales, mergers, restructurings and other ownership changes.
The firm has published examples of Birmingham-based tax specialists supporting transaction tax guidance and tax due diligence during corporate deals. This connection between corporate finance and tax can be useful when a transaction requires financial due diligence, tax analysis and wider deal support to move forward together.
Key Facts:
Ideal for: Owner-managed businesses, family businesses and mid-market transactions
Core services: Tax due diligence, transaction tax, corporate finance, financial due diligence
Transaction support: Business acquisitions, disposals, mergers and restructurings
Address: Cornerblock, 2 Cornwall St, Birmingham B3 2DX, United Kingdom
Phone: 03333446306
Cooper Parry
Cooper Parry provides financial and tax due diligence through its transaction services practice. The firm supports buyers, sellers and investors, with transaction tax specialists examining the tax risks that may affect deal value, negotiations or post-acquisition planning.
Its business tax offering specifically includes tax due diligence, transaction tax advisory, acquisition structuring, funding and debt structuring, and post-acquisition integration support. Cooper Parry also publishes sector-specific tax due diligence material, showing how the scope can change according to matters such as VAT, employment status, payroll and corporate tax.
Key Facts:
Ideal for: Growth businesses, investors and private equity-backed companies
Core services: Tax due diligence, financial due diligence, transaction tax, SPA support
Transaction support: Acquisitions, investments and disposals
Forvis Mazars has a dedicated tax due diligence service covering historic tax compliance, previous reorganisations, share schemes, employment taxes and other exposures that can influence transaction pricing. Transaction tax specialists can also work on structuring and future tax considerations where these form part of the deal.
The Birmingham office includes due diligence specialists and moved to Three Chamberlain Square in 2026. Its local team works with privately owned businesses, larger corporates, international organisations and financial services businesses, while the wider network can support transactions involving several jurisdictions.
Key Facts:
Ideal for: Mid-market, large corporate and international transactions
Core services: Tax due diligence, financial due diligence, transaction tax
Address: 3 Chamberlain Square, Birmingham B3 3AX, United Kingdom
Phone: +44 (0) 121 232 9500
S&W Group
S&W Group provides M&A tax due diligence through its transaction services practice. For buyers, the work is designed to identify UK and international tax liabilities and assets that could influence pricing or contractual protections. Sellers can use the same capability to identify and address tax issues before formal buyer diligence begins.
Its Birmingham office offers corporate finance, transaction services and business tax support from the same local practice. Birmingham-based tax specialists also have experience in buy-side and sell-side due diligence, which allows tax findings to be considered alongside wider transaction work.
Key Facts:
Ideal for: SMEs, mid-market companies, investors and international groups
Core services: M&A tax due diligence, transaction services, corporate finance
Transaction support: Purchaser and vendor due diligence
Grant Thornton provides transaction tax support throughout business acquisitions, sales, capital raising and restructurings. Its services include buy-side and sell-side tax due diligence, transaction structuring, legal documentation review and tax input into post-transaction planning.
The firm’s Birmingham office combines tax and corporate finance advisory services, while the wider transaction practice can assemble specialists according to the requirements of a deal. Published transaction work also shows Grant Thornton providing integrated financial and tax due diligence where clients require several deal workstreams to operate together.
Key Facts:
Ideal for: Mid-market companies, private equity and corporate transactions
Core services: Tax due diligence, transaction tax, tax structuring
Transaction support: Buy-side, sell-side and post-completion tax advice
PwC provides tax due diligence as part of its wider Deals and M&A tax work. Its teams can coordinate tax reviews with financial due diligence, transaction structuring, analytics and support with transaction documentation, which can be useful in deals involving several interdependent workstreams.
The firm’s Birmingham office is one of its major regional UK locations. PwC has also published West Midlands transaction work in which its tax and transaction services specialists provided buy-side financial and tax due diligence alongside structuring advice, demonstrating a direct connection between its Birmingham market presence and deal-related tax work.
Key Facts:
Ideal for: Larger corporates, private equity and complex transactions
Core services: Tax due diligence, M&A tax, financial due diligence, deal structuring
Transaction capability: UK and cross-border transactions
Location: One Chamberlain Square, Birmingham
Contact Information:
Website: www.pwc.com
Facebook: www.facebook.com/PwCUK
LinkedIn: www.linkedin.com/company/pwc-uk
Instagram: www.instagram.com/pwc_uk
Address: One Chamberlain Square, Birmingham, B3 3AX
Phone: +44 (0)121 265 5000
Crowe UK
Crowe provides tax due diligence on acquisitions, investments and disposals, often alongside financial due diligence and wider transaction support. Published deal work shows its tax teams reviewing transaction exposures for corporate buyers, private equity investors and companies preparing for a sale.
Crowe opened a central Birmingham office at One Colmore Row in 2025 and has continued adding local tax expertise. Birmingham specialists cover areas such as corporate transaction tax, VAT, restructuring and due diligence, giving companies in the Midlands access to both direct local advisers and Crowe’s wider national transaction teams.
Key Facts:
Ideal for: Corporates, investors, owner-managed businesses and private equity
Core services: Tax due diligence, transaction tax, financial due diligence
Tax coverage: Corporate tax, VAT and transaction-related restructuring
KPMG’s Deal Advisory Tax practice provides tax due diligence for buy-side transactions, with work focused on identifying material historic risks before an acquisition. The same practice supports transaction structuring, tax modelling, management incentives, transaction documents and vendor due diligence.
Its Birmingham office is KPMG’s largest UK regional office outside London and includes tax, advisory and corporate finance specialists. The combination can suit transactions where tax due diligence needs to interact with broader M&A, financing, accounting or operational considerations rather than being treated as a standalone review.
Key Facts:
Ideal for: Large businesses, private equity, financial services and international groups
Core services: Tax due diligence, deal structuring, vendor due diligence
Transaction support: Buy-side, sell-side, debt raising and restructuring
Location: One Snowhill, Birmingham
Contact Information:
Website: kpmg.com
Twitter: x.com/kpmguk
LinkedIn: www.linkedin.com/company/kpmg-uk
Address: One Snowhill, Snowhill Queensway, B4 6GH , Birmingham, UK
Phone: +44 (0)121 232 3000
Deloitte
Deloitte provides M&A tax due diligence and structuring as part of its tax and transaction advisory practice. Its teams support businesses entering new markets, buying or selling companies and carrying out restructurings, with tax work extending into legal entity structuring and post-merger integration.
Deloitte maintains a large Midlands practice in Birmingham, bringing together tax, financial advisory and transaction professionals. Its local presence can be useful for businesses that need tax diligence within a larger transaction programme involving financial, operational or integration work.
Key Facts:
Ideal for: Large corporates, international groups and complex M&A
Core services: M&A tax due diligence, tax structuring, transaction advisory
Transaction support: Acquisitions, disposals, restructurings and post-merger integration
Location: Birmingham
Contact Information:
Website: www.deloitte.com
Facebook: www.facebook.com/deloittedanmark
Twitter: x.com/DeloitteDanmark
LinkedIn: www.linkedin.com/company/deloitte
Address: Four Brindleyplace, Birmingham, B1 2HZ United Kingdom
Phone: +44 (0)121 632 6000
EY
EY provides tax diligence for business acquisitions through its M&A tax practice. Buy-side work can identify historical and potential future tax exposure, while the wider transaction tax team can support acquisition structuring and other tax matters arising throughout the deal lifecycle.
EY has more than 1,200 people connected with its Birmingham office and maintains tax and transaction capabilities in the Midlands. Its wider transactions practice combines financial, tax, commercial, operational and other forms of due diligence, making it particularly relevant when a tax review needs to be integrated into a broader assessment of a target business.
Key Facts:
Ideal for: Corporate groups, private equity and multi-workstream transactions
Core services: Tax diligence, M&A tax planning, financial and commercial due diligence
Transaction capability: UK and international deal support
Location: Birmingham
Contact Information:
Website: www.ey.com
Facebook: www.facebook.com/EY
Twitter: x.com/EYnews
LinkedIn: www.linkedin.com/company/ernstandyoung
Address: One Colmore Square, Birmingham B4 6HQ
Phone: +44 121 535 2000
Conclusion
Tax due diligence providers in Birmingham vary considerably in scale and in the way they approach transaction work. Some focus closely on owner-managed and mid-market deals, while others have larger multidisciplinary teams suited to international acquisitions, private equity investments and transactions involving several jurisdictions.
Before appointing a firm, businesses should define the areas that actually need examination. Corporation tax may be only one part of the review, with VAT, employment taxes, share schemes, international tax or historic reorganisations also requiring attention. Comparing the proposed scope, transaction experience, reporting approach and ability to coordinate with legal and financial advisers can help identify a provider that fits the specific deal.
AC
Written by the Acumon team
Acumon is an ICAEW-registered firm of chartered accountants and registered auditors
based in London, with offices in Pitstone, Aylesbury and Bournemouth. Need advice on
anything covered here? Talk to us.
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