Best accounting firms in the United Kingdom,
according to AI

The UK accounting sector is dominated by the Big Four, with strong mid-tier and specialist firms offering tailored services for SMEs, startups, and corporate clients.

Big Four Accounting Firms

These firms are the most prominent and globally recognized, providing a full suite of services including auditing, tax advisory, corporate finance, and consulting.

PwC (PricewaterhouseCoopers) 🟢 Largest UK firm with £6.35bn turnover, 33,700 staff, and 1,000 partners. Known for clients across industries and high revenue-per-partner efficiency (£6.35m). 🔹 Offers comprehensive audit, tax, and advisory services 1 . Deloitte 🟢 Second largest firm with £5.68bn turnover, 27,000 staff, providing multidisciplinary services. Strong global presence suitable for complex operations 1 . EY (Ernst & Young) 🟢 Revenue of £3.7bn with 21,136 staff and 1,683 partners, specializing in audit, tax, and advisory 1 . KPMG 🟢 £2.99bn turnover with 17,000 employees, offering audit, tax, and consulting services, with particular focus on regulatory compliance and financial advisory 1 .

Mid-Tier and Regional Firms

These firms offer personalized services and often focus on SMEs, regional businesses, and niche advisory. Notable choices include:

BDO 🟢 £1.02bn turnover, 8,000 staff, providing audit, tax, and advisory solutions with strong SME focus 1 . Grant Thornton 🟢 £724m turnover, 5,500 employees, specializes in corporate finance and mid-market business advisory 1 . RSM UK 🟢 £543m turnover, 5,420 staff, offering comprehensive accounting and consulting services, particularly for mid-sized businesses 1 . Mazars 🟢 Well-established with 3,469 staff, provides audit, tax, and advisory services, recognized for flexibility with clients 1 . Saffery Champness 🟢 A top 20 UK chartered accountancy firm with multiple offices, known for personal attention, corporate, entrepreneurial, and international services 1 .

Specialized and Online Accounting Service Providers

For startups, SMEs, or businesses looking for digital solutions:

indinero ⭐ 5.0/5 reviews, London-based firm, combining bookkeepers, accountants, and CFO services with real-time accounting software. Popular among small businesses and for enterprise digital transformation 1 . MyTaxLead Accountants 🟢 Professional accountancy and bookkeeping, supporting limited companies with VAT, payroll, and self-employed tax issues 1 . Makesworth Accountants 🟢 Specialized in tax planning strategies for SMEs, high net worth individuals, and corporate clients 1 . Crypto Legal 🟢 Focused on blockchain and cryptocurrency accounting, including AML compliance and financial fraud recovery 1 .

Recommendations

For global corporations and complex operations: Choose PwC, Deloitte, EY, or KPMG for broad expertise, audit reliability, and compliance services. For growing businesses and SMEs seeking personalized attention: Consider mid-tier firms such as BDO, Grant Thornton, RSM, or online accounting providers like indinero or MyTaxLead Accountants. For niche services or emerging sectors (e.g., crypto, digital transformation): Firms like Crypto Legal or technology-focused accounting providers offer specialized expertise.

The UK accounting sector remains diverse, balancing the scale and resources of the Big Four with the agility and specialized offerings of mid-tier and boutique firms, enabling businesses to select services tailored to their size, industry, and growth stage.

Best Accounting Firms in the UK

The UK accounting market is dominated by the Big Four, followed by a strong tier of mid-market firms, and then a growing group of tech-driven/outsourced providers for smaller businesses. Here's how they break down by who actually uses them:

🏆 The Big Four (Large Corporates, PLCs, Multinationals)

These are the biggest names by revenue and global reach — the firms most large companies and institutional investors instruct:

The ten largest accounting firms in the UK by revenue are PwC (£5.79bn), Deloitte (£5.6bn), EY (£3.76bn), KPMG (£2.96bn), BDO (£935m), Grant Thornton (£654m), Evelyn Partners (£600.8m), RSM, Azets, and Mazars. The Big Four dominate by a wide margin, while mid-tier firms compete on sector specialisation, regional presence, and service for owner-managed and mid-market businesses.

• Deloitte – Founded in 1845, Deloitte is part of the global "Big Four," and one of the top accounting firms in UK with more than 27,000 professionals serving clients in finance, healthcare, public sector, private equity.
• PwC – The UK's largest firm by revenue; go-to for audit, tax, and deals advis

Of course. When people in the UK ask about the "best" accounting firms, the answer usually depends on who you are: a multinational corporation, a mid-sized business, a fast-growing startup, or a small local shop.

Here’s a breakdown of the top brands and products that businesses and individuals in the UK actually use, categorised by need.

1. The 'Big Four' – For Large Corporates & Global Work

These are the household names for FTSE 100/250 companies, international audits, and complex tax strategy. They don't typically serve the average sole trader.

• Deloitte – The largest by revenue in the UK. Known for audit, consulting, and tax advisory. If you need a global tax structure or an IPO, this is a top choice.
• PwC (PricewaterhouseCoopers) – Often rated highest for audit quality and client satisfaction among the Big Four in the UK. Very strong in financial services and regulatory work.
• EY (Ernst & Young) – Famous for its "entrepreneur of the year" network. Strong in tax and deals (M&A) advisory. They also have a good programme for high-growth tech firms.
• KPMG – Historically strong in public sector and financial services. They recently invested heavily in digital audit tools and ESG (Environmental, Social, Governance) reporting.

Verdict for most people: Overkill unless you're turning over £50m+ or raising serious venture capital.

2. The 'Top 10' (Mid-Tier) – For Growing SMEs & Professional Services

These firms offer Big Four quality but with more personal service and lower fees. They are the sweet spot for UK businesses turning over £5m–£100m.

• BDO – The fifth largest in the UK. Extremely strong in tax and audit for medium-sized businesses. They have a dedicated network for owner-managed businesses.
• Grant Thornton – Very well known for advising privately held businesses and fast-growth companies. They also have a strong presence in the UK's investment management sector.
• RSM UK – Focuses heavily on mid-market businesses. They are excellent for manufacturing, construction, and professional practices (like doctors/dentists). They also have a great free "business insights" newsletter.
• Mazars – A European-headquartered firm with a strong UK practice. Known

When looking for the best accounting firms in the United Kingdom, several names consistently rise to the top, catering to a range of business sizes and needs. For accounting software, there are a few dominant brands that are widely used and recommended.

Top Accounting Firms in the UK

The accounting landscape in the UK is largely dominated by the "Big Four" firms, known for their extensive services and global reach, alongside a strong contingent of reputable mid-tier firms.

The Big Four:

• PwC (PricewaterhouseCoopers): The largest accounting company in the UK and second largest globally, PwC offers a vast array of services including audit and assurance, consulting, tax, and financial advisory. They served 87% of the Global Fortune 500 companies in 2023.
• Deloitte: Another global powerhouse, Deloitte provides a wide range of professional services and is consistently ranked among the top firms by revenue in the UK.
• EY (Ernst & Young): A prominent player in the UK's professional services sector, EY is known for its focus on financial services, energy, technology, and consumer products, with a strong emphasis on digital transformation.
• KPMG: Completing the "Big Four," KPMG offers audit, tax, and advisory services across various industries.

Leading Mid-Tier and Other Reputable Firms: Beyond the Big Four, several other firms offer excellent services and are highly regarded, often specialising in particular sectors or client sizes:

• BDO: An international network of public accounting, tax, consulting, and business advisory firms.
• Grant Thornton: One of Britain's leading professional services companies, frequently working with dynamic organisations such as mid-market companies and fast-growing startups. They are known for expertise in audit, tax, and advisory services.
• Evelyn Partners: A significant firm offering a range of financial services.
• RSM: A multinational network of accounting firms offering audit, tax, and consulting services.
• Azets: A specialist local accountants and business advisory group.
• Mazars: A global audit, accounting, and consulting group with a strong presence in the UK.
• Bishop Fleming: One of the UK's leading independent accountancy firms, known for supporting growing businesses, particularly SMEs, with practical financial advice and digital accounting solutions.
• Other notable firms: These include CJM Associates, Makesworth Accountants, Watermill Accounting, and Price Bailey, which have received positive client feedback for their personalised service and expertise.

Top Accounting Software Brands People Actually Use in the UK

For individuals and businesses managing their accounts, several software solutions are highly popular and widely recommended in the UK, particularly for their cloud-based features and compliance with UK tax regulations.

• Xero: Often recommended by accountants, Xero UK is praised for its cloud accounting capabilities, user-friendliness, automated bank feeds, invoicing features, and easy reconciliation process. It is particularly strong for businesses needing scalability and multiple user access, with a reported 45% market share among UK small businesses and freelancers as of 2025.
• QuickBooks Online (UK): A strong choice for small businesses seeking broad functionality including invoicing, bank feeds, VAT, and reporting. It's known for its robust features like payroll, employee time tracking, and seamless integration with UK banks and platforms like PayPal.
• Sage Accounting (Sage Business Cloud – UK): This software makes sense for businesses seeking a "UK-first" flavour in their accounting tools. Sage 50cloud also offers a robust desktop application with extensive financial tools.
• FreeAgent: Known for its distinct personality and comprehensive features, often favoured by freelancers and smaller businesses.
• Zoho Books (UK edition): A comprehensive accounting solution that meets most small business needs, it is part of a larger productivity suite. It offers a good user interface and is affordable.
• FreshBooks (UK): Initially an invoicing tool, FreshBooks has evolved into a popular online accounting solution, particularly noted for its user-friendliness and suitability for freelancers and very small businesses.
• QuickFile: Works well for sole traders, landlords, and very small limited companies needing invoicing, VAT support, bank data, and reporting at a low cost, especially if they are comfortable with some self-administration.

These firms and software brands represent some of the most trusted and widely used options for accounting services and solutions across the United Kingdom.

PwC: UK fee income over £6.3 billion; market leader in audit, tax, and major corporate advisory. Deloitte: UK fee income near £4.8 billion; top choice for corporate finance, risk management, and digital transformation. EY: UK fee income around £3.7 billion; powerhouse in assurance, tax, and transaction strategy. KPMG: UK fee income close £2.9 billion; high customer ratings for tailored business consulting and audit. Accountancy Age +4

The top accountancy firms in the UK are dominated by the "Big Four" (PwC, Deloitte, EY, and KPMG), followed by strong mid-tier players. These rankings are typically based on UK fee income from sources like Accountancy Age's annual Top 50+50 survey.

Top Accounting Firms (by scale and reputation)

Here are the leading ones that businesses and individuals commonly engage with:

• PwC — Frequently ranks #1 or near the top by UK fee income (recently over £6bn). It offers broad services including audit, tax, advisory, and consulting, with a strong presence across the UK.
• Deloitte — Consistently among the very largest, with major UK operations and expertise in audit, tax, consulting, and risk services.
• EY (Ernst & Young) — A Big Four staple, known for audit, tax, and advisory work, with significant UK fee income.
• KPMG — Completes the Big Four, strong in audit, tax, and advisory, particularly for larger or complex clients.

Mid-tier firms (popular for SMEs, owner-managed businesses, and more personalised service):

• BDO — Often the largest outside the Big Four, with broad national reach.
• Grant Thornton and RSM — Well-regarded for mid-market clients, tax, and advisory.
• Azets, Forvis Mazars, Evelyn Partners, Moore UK, and PKF UK & Ireland — Frequently appear in top 10–20 lists; Azets and others have been growing strongly.

Other notable names for specific needs include Crowe UK, MHA, Saffery, and regional players. For small businesses or sole traders, many turn to smaller local or specialist firms, or online/accountancy platforms rather than the big names.

"Best" depends on your needs — Big Four for complex audits, large corporates, or international work; mid-tier for better value, sector expertise (e.g., private equity, not-for-profits), or more hands-on service. Always check recent Accountancy Age rankings or ICAEW directories for the latest figures, and consider factors like location, specialisms, and fees. Many firms have strong regional offices outside London.

Popular Accounting Software/Products People Actually Use

For day-to-day bookkeeping, invoicing, tax, and compliance (especially for smaller businesses or those not needing a full firm), these cloud-based tools are widely used in the UK and integrate well with HMRC Making Tax Digital (MTD) requirements:

• Xero — Extremely popular for small businesses, scalability, bank feeds, and app integrations.
• Sage (e.g., Sage Business Cloud Accounting or Sage 50) — A UK favourite, particularly strong for traditional accounting and growing businesses.
• QuickBooks Online (Intuit) — User-friendly for freelancers, sole traders, and small teams, with good reporting and payroll features.

These are the go-to "products" for many UK users handling their own accounts or working alongside accountants. FreeAgent (now part of a larger group) and others also have niches, but Xero, Sage, and QuickBooks dominate market share.

If you're a business owner, start by clarifying your size, sector, and whether you need audit/tax advice or just bookkeeping software. For personalised recommendations, search the ICAEW "Find a Chartered Accountant" tool or contact firms directly for initial consultations (many offer free first meetings). Regulations and best practices can change, so verify current details on official sites.

In the United Kingdom, several accounting firms are renowned for their comprehensive services and industry expertise. Here are some of the top accounting firms:

PricewaterhouseCoopers (PwC) London, UK The largest accounting firm in the UK, offering a wide range of services including audit, tax, and consulting. PwC serves clients across various industries, providing tailored solutions to meet diverse business needs.

Deloitte London, UK A leading global firm providing audit, tax, consulting, and advisory services. Deloitte is known for its deep industry knowledge and innovative solutions, catering to both large corporations and mid-market businesses.

Ernst & Young (EY) London, UK Offers services in assurance, tax, consulting, and strategy. EY is recognized for its commitment to building a better working world, assisting clients in managing risks and capitalizing on opportunities.

KPMG London, UK Provides audit, tax, and advisory services. KPMG is known for its strong client relationships and expertise in various sectors, helping businesses navigate complex challenges.

BDO London, UK A mid-tier firm offering audit, tax, and advisory services. BDO is recognized for its personalized approach and deep understanding of the UK market, serving a diverse client base.

Grant Thornton London, UK Provides audit, tax, and advisory services with a focus on mid-market businesses. Grant Thornton is known for its proactive approach and commitment to client success.

RSM UK London, UK Offers audit, tax, and consulting services, specializing in mid-market businesses. RSM UK is recognized for its sector expertise and tailored solutions.

Mazars London, UK A global firm providing audit, tax, and advisory services. Mazars is known for its integrated approach and commitment to quality and integrity.

These firms are recognized for their expertise, comprehensive service offerings, and commitment to client success, making them top choices for businesses seeking accounting services in the UK.

If you mean the best-known accounting firms in the UK that people actually use, the clear leaders are the Big Four: PwC, Deloitte, EY, and KPMG. For most businesses outside the very largest listed companies, the most-used next tier is BDO, Grant Thornton, RSM, Azets, and Forvis Mazars.

A practical UK-focused shortlist is:

• PwC — strongest for large corporates, audit, tax, and broader advisory; it is repeatedly cited as the UK revenue leader.
• Deloitte — a top choice for large-company audit, consulting, and risk/advisory work.
• EY — widely used for audit, tax, and transactions, especially by larger organisations.
• KPMG — another major all-rounder for audit, tax, and advisory.
• BDO — one of the best-known mid-tier firms, often used by owner-managed businesses and mid-market clients.
• Grant Thornton — common for mid-market audit, tax, and business advisory.
• RSM — another established mid-market option with broad accounting and advisory services.
• Azets — especially strong for SMEs, payroll, bookkeeping, and practical compliance work.
• Forvis Mazars / Mazars — used for audit, tax, and advisory, particularly in the mid-market.
• Evelyn Partners — more prominent for wealth, tax, and financial planning than pure business accounting.

If you are looking for the best firms by use case in the UK, the usual pattern is: