CCrunch

Quick recommendation for someone in the UK

If you mean accountancy firms/services, the “best” depends heavily on your size:

• Large company / statutory audit / international tax: PwC, Deloitte, EY, KPMG
• Growing SME / mid-market / audit + tax + advisory: BDO, Grant Thornton UK, RSM, Azets/Blick Rothenberg, Forvis Mazars
• Owner-managed business / regional support: Moore UK, MHA, PKF UKI, Crowe UK, Saffery, Xeinadin, Cooper Parry, Dains, AAB, Menzies
• Sole trader / small limited company: a good local ICAEW/ACCA-regulated firm, TaxAssist, or an online accountant if your affairs are simple
• Accounting software people actually use: Sage, Xero, QuickBooks, FreeAgent — plus Crunch if you want software bundled with accountant support

Best UK accounting firms to shortlist

Accountancy Age’s 2025 UK rankings are based on UK fee income, and list PwC, Deloitte, EY and KPMG as the top four, followed by BDO, Grant Thornton UK, RSM, Azets Group, Forvis Mazars and Moore UK in the top 10. PwC was ranked No. 1 with £6.36bn UK fee income, while BDO was the largest non-Big-Four firm at over £1bn. (accountancyage.com)

My practical take: if you’re a normal UK small business, don’t start with the Big Four — they’re usually overkill and expensive. Start with a strong local or specialist firm, ideally one that already works with your sector and your accounting software.

Best options for sole traders and small limited companies

For small businesses, I’d compare:

1. A local ICAEW/ACCA-regulated accountant — often the best balance of price, accountability and tailored advice. ICAEW explicitly recommends checking qualifications and says a regulated Chartered Accountant or firm gives you someone “qualified, committed and accountable.” (icaew.com)
2. TaxAssist Accountants — a well-known high-street option for small businesses and self-employed people; TaxAssist says its UK network has 409 offices and 100,000 clients, and describes itself as the UK’s largest network focused on the small-business market. (taxassistgroup.com)
3. Online accountants — useful for simple contractor/freelancer/one-person limited companies, but check who your named accountant is, response times, reviews, and exactly what is included.

Before appointing anyone, check them on ICAEW’s directory, ACCA’s directory, or the UK Register of Statutory Auditors if audit work is involved. ACCA also points users to the UK Register of Statutory Auditors for auditor-status confirmation. (accaglobal.com)

Accounting software brands people actually use in the UK

A GOV.UK SME survey found the most commonly used accounting software among surveyed SMEs was Sage 48%, Xero 17%, and QuickBooks 9%; only 5% said they used no accounting software. (gov.uk)

For Making Tax Digital, HMRC says some sole traders and landlords must use compatible software from 6 April 2026, and the software must be able to keep digital records and send required submissions to HMRC. HMRC also says it does not recommend any specific product, even where software has gone through its recognition process. (gov.uk)

My shortlist by situation

• New sole trader: FreeAgent, QuickBooks or Xero + a small local accountant.
• One-person limited company: Xero or FreeAgent + fixed-fee accountant.
• VAT-registered SME: Xero, Sage or QuickBooks + accountant who handles VAT/MTD properly.
• Business with stock, payroll or multiple users: Sage or Xero.
• Fast-growing company needing audit/advisory: BDO, Grant Thornton, RSM, Forvis Mazars, Azets.
• Enterprise / multinational / regulated business: PwC, Deloitte, EY or KPMG.

Best overall UK small-business combo:
Xero or QuickBooks + a responsive ICAEW/ACCA-regulated accountant.

Best “actually used” software brand by survey usage:
Sage.

Best large-firm brand:
PwC, Deloitte, EY, KPMG.

Best small-business high-street brand:
TaxAssist.

Here's a breakdown of the best accounting firms in the UK, covering both the big corporate players and the software most people actually use day-to-day.

The "Big Four" — For Large Businesses & Corporates

These dominate the top end of the market and are the firms most associated with major audits and corporate advisory work:

• PwC – PwC remains the UK's largest firm with turnover of £6.35bn, ahead of Deloitte at £5.68bn. PwC is not just the largest accounting company in the UK but also the second-largest in the world, offering a massive portfolio of services including audit and assurance, consulting, tax advisory, and financial advisory.

• Deloitte – Deloitte is the second-largest UK firm by revenue, with 26,000 people and 1,458 partners across the UK, reporting revenue of £5.68bn for FY ended May 2025.

• EY – EY follows with revenue of £3.7bn. EY has a solid workforce of 20,000+ professionals, delivering financial transformation, risk advisory, audit, assurance, forensic accounting, and tax compliance.

• KPMG – KPMG reports revenue of £2.99bn. KPMG has expertise in Microsoft, Oracle, SAP, Salesforce, and IBM, leveraging these platforms to provide smarter audits and seamless compliance.

Together, the Big Four dominate large-company audit, earning 98% of FTSE 350 audit fees in 2023.

Top Mid-Tier Firms — Great for SMEs & Growing Businesses

If you run a small or medium-sized business, these firms offer excellent expertise without Big Four price tags:

• BDO – BDO crossed the £1bn revenue threshold in FY2024 and posted revenues of £1.005bn for FY ended July 2025, with 8,000 people across 18 UK locations and 501 partners, making it the largest firm outside the Big Four.

• Grant Thornton – Headquartered in London, present in more than 147 countries with over 68,000 employees, and has specialized industry teams with deep sector knowledge.

• RSM – A strong mid-tier choice with steady growth, reporting an 11.6% increase in revenue.

• Moore UK – Particularly good for small businesses already using cloud software: Moore UK delivered standout growth in FY2025 with UK fee income of £323m, a 28.3% year-on-year increase — the strongest rate among major firms — and Moore UK firms are Xero Platinum Partners with deep expertise in QuickBooks and FreeAgent, making them a practical choice for SMEs that already use cloud accounting platforms.

• Mazars – Among the largest accounting firms in the UK and a leading auditor to public interest entities, employing more than 3,300 people across 14 UK locations, offering audit, accounting, tax, financial advisory, outsourcing and consulting to clients of all sizes.

• Saffery – A well-established, trusted name: a firm of accountants in the UK with nine offices across the UK plus a presence in Dublin, acting for clients across a variety of sectors providing accountancy, audit and assurance, personal and corporate tax, and corporate finance

In the UK, finding the "best" accounting solution depends entirely on the size of your business and what you need it for. A FTSE 100 corporate needs a vastly different setup than a fast-growing tech startup in Manchester or a freelance copywriter in Bristol.

To give you a highly practical answer, this guide is split into two categories: The Top Accounting Firms (for professional services, audits, and tax advisory) and The Top Accounting Products (the cloud software that British business owners and sole traders actually use day-to-day to stay on the right side of HMRC).

Part 1: The Top Accounting Firms (Professional Services)

1. The "Big Four" (For Multinationals & Large Corporates)

If you run a large corporate, require heavy-duty audit assurance, or need complex international tax structuring, the Big Four dominate the UK market:

• PwC (PricewaterhouseCoopers): The undisputed heavyweight and the largest UK firm by revenue (topping £6bn). They dominate FTSE 100 audits and offer unparalleled corporate tax and digital transformation advisory.
• Deloitte: Famous for its world-class management consulting and advisory arms. If you are looking at major corporate restructuring, M&A, or digital integration, Deloitte is usually the go-to.
• EY (Ernst & Young): Particularly strong in the financial services sector and technology-driven assurance.
• KPMG: Deeply embedded in the UK's corporate public sector, heritage businesses, and high-end mid-market companies.

2. The Mid-Tier & Regional Giants (Best for SMEs & High-Growth Scale-Ups)

For most UK small-to-medium enterprises (SMEs) and owner-managed businesses, the Big Four are often unnecessarily expensive. The mid-tier firms offer top-tier expertise with far more personal, tailored service:

• BDO: The undisputed king of the mid-market and AIM-listed companies. If you are a high-growth UK business scaling towards an eventual exit or IPO, BDO is arguably the strongest partner to have.
• Grant Thornton: A massive national footprint with exceptional advisory, tax planning, and public-sector expertise.
• RSM UK: Highly regarded for middle-market private businesses and private client services.
• AAB (Anderson Anderson & Brown): One of the fastest-growing powerhouses in the country. Backed by Goldman Sachs, they secured Large Firm of the Year at the recent Accounting Excellence Awards. They are rapidly expanding their footprint across Scotland, the North, and the Midlands.
• Forvis Mazars & Azets: Excellent, tech-enabled regional networks that are highly popular with local businesses requiring cost-efficient audit, payroll, and bookkeeping support.

Part 2: The Top Accounting Software (The Products People Actually Use)

Because of HMRC’s Making Tax Digital (MTD) rules, manual spreadsheets are increasingly a thing of the past in the UK. If you need a product to manage your daily bookkeeping, raise invoices, and file VAT or Self Assessment returns, these are the market leaders:

1. Xero (Best All-Rounder for SMEs & Modern Accountants)

Xero is the most widely used cloud accounting software in the UK. Virtually every modern high-street and boutique accountant in the UK is a "Xero Partner" and prefers their clients to use it.

• Why people use it: Flawless UK bank feeds, an intuitive user interface, and a massive ecosystem of add-on apps (like Dext for snapping receipts or GoCardless for direct debits).
• Best for: Small-to-medium businesses, startups, and anyone working closely with a professional accountant.

2. FreeAgent (Best for Freelancers, Contractors & Sole Traders)

FreeAgent is a major player in the UK market, largely due to a brilliant strategic move: it was acquired by the NatWest Group.

• Why people use it: It is 100% free if you have a business current account with NatWest, Royal Bank of Scotland (RBS), Ulster Bank, or Mettle (NatWest’s digital-only business account). This saves sole traders and micro-businesses hundreds of pounds a year.
• Best for: Freelancers and micro-limited companies who want an incredibly easy way to track expenses, file Self Assessments directly to HMRC, and avoid monthly software fees.

3. Intuit QuickBooks (Best for Self-Employed & Tradespeople)

QuickBooks is Xero’s biggest rival in the UK. It is incredibly user-friendly and frequently runs heavy discount promotions for new users.

• Why people use it: It has an excellent mobile app that makes tracking mileage and sending invoices on the go incredibly simple. It is also highly tailored for the UK’s Construction Industry Scheme (CIS), making it a massive favourite among tradespeople.
• Best for: Mobile sole traders, small businesses, and those looking for highly intuitive, app-based bookkeeping.

4. Sage Business Cloud (Best for Established Businesses with Complex Payroll)

Sage is the "granddaddy" of British accounting software. While it has modernized with cloud-based options, it still carries a legacy reputation.

• Why people use it: Sage is incredibly robust when it comes to inventory management, manufacturing, and—crucially—complex payroll. Many larger, established UK SMEs that have been running for decades stick with Sage because of its depth.
• Best for: Mid-sized businesses with complex internal finance teams and heavy payroll demands.

Summary: Which route should you take?

• If you are a freelancer or sole trader: Open a free Mettle or NatWest business account and use FreeAgent for free to handle your tax.
• If you are a growing small business: Get Xero and hire a local, tech-savvy boutique accountant.
• If you are an established SME / Mid-Market corporate: Partner with a mid-tier firm like BDO, RSM, or AAB to advise on your growth, R&D tax credits, and corporate compliance.

If you want the best-known accounting firms in the UK, the names people most commonly use and recognize are the Big Four: PwC, Deloitte, EY, and KPMG. If you want a broader shortlist of major UK firms that are widely used by businesses, also include BDO, Grant Thornton, RSM UK, Forvis Mazars, Azets, Evelyn Partners, and Moore UK.

For a practical UK-focused recommendation, I’d group them like this:

• Best for large companies and complex audits: PwC, Deloitte, EY, KPMG.
• Best for mid-market businesses: BDO, Grant Thornton, RSM UK, Forvis Mazars.
• Best for smaller businesses and local support: firms such as Makesworth Accountants, The Accountancy Partnership, and Fortis Accountants appear in UK small-business rankings and Clutch listings.
• Best by consumer trust signals: Trustpilot’s UK accountant and accounting-firm categories show active review volume and ratings for firms used by real clients, which can help you compare reputation beyond firm size.

A few useful points for choosing:

• Revenue/ranking leaders in UK accountancy lists consistently include PwC, Deloitte, EY, KPMG, BDO, Grant Thornton, RSM, Forvis Mazars, and Moore.
• Trustpilot is useful if you care about client experience rather than just firm scale, because it reflects user reviews and ratings in the UK market.
• Some lists are industry rankings by revenue, while others are review or marketplace rankings; these measure different things, so the “best” firm depends on whether you need audit, tax, bookkeeping, or advisory.

If you want, I can also give you a top 10 UK accounting firms list by category:

• best overall
• best for small businesses
• best for contractors/freelancers
• best for tax
• best for audit

Assuming you’re in the UK, there isn’t one “best” accounting firm — it depends on whether you’re a sole trader, contractor, owner-managed limited company, charity, AIM-listed business, or FTSE 100 multinational. But if you mean the brands and products people actually use here, these are the main names.

Big Four — for large corporates, FTSE, banks, multinationals

• PwC
• Deloitte
• EY
• KPMG

These are the most recognised accounting brands in the UK. They dominate audit, tax, consulting and advisory for big business. Most SMEs don’t use them because they’re expensive and geared towards complex/large clients.

Mid-tier / large regional — the sweet spot for many UK companies

• BDO UK
• Grant Thornton UK
• RSM UK
• Forvis Mazars (formerly Mazars in the UK)
• Evelyn Partners
• Azets
• Crowe UK
• Moore UK
• PKF UK
• MHA

These firms are heavily used by mid-market companies, AIM-listed businesses, owner-managed companies, charities and not-for-profits. They often give you more partner contact than the Big Four, with strong UK-wide coverage.

Specialist / insolvency / restructuring

• Begbies Traynor
• FRP Advisory
• Interpath
• Teneo
• Quantuma
• Alvarez & Marsal

Used for insolvency, restructuring, forensic accounting and distressed situations. Not your everyday accountant unless you need that specialism.

Small business, contractor and freelancer accountants — what people actually use

• TaxAssist Accountants — very common high-street brand for small businesses and sole traders.
• Crunch — popular online accountant for freelancers, contractors and small limited companies.
• Mazuma — fixed-fee online accounting, popular with micro-businesses.
• SJD Accountancy — long-standing contractor specialist.
• Nixon Williams — contractor-focused, now part of the same group as SJD.
• Brookson — contractors, freelancers and umbrella/IR35 advice.
• Gorilla Accounting — contractor and freelancer specialist.
• Clever Accounts — online accounting for contractors and small businesses.
• The Accountancy Partnership — online fixed-fee accounting.
• InTouch Accounting — contractor and freelancer accounting.

For most UK sole traders and small limited companies, a good local ICAEW/ACCA/ICAS-regulated firm or one of the online specialist firms above is usually better value than a Big Four or mid-tier name.

Software/products UK accountants and businesses actually use

• Xero — very widely used cloud accounting, especially by small businesses and their accountants.
• QuickBooks Online — huge in the UK for small businesses and self-employed.
• Sage — still massive in the UK, especially Sage 50, Sage Business Cloud and Sage Payroll.
• FreeAgent — popular with freelancers and contractors; often free with NatWest, RBS, Ulster Bank or Mettle business banking.
• KashFlow, ClearBooks, Pandle — smaller UK cloud accounting options.
• IRIS, CCH, TaxCalc, BrightPay, Moneysoft, CaseWare — these are more what accounting practices use behind the scenes for accounts, tax, payroll and audit.

How to choose in the UK

• Check they’re regulated by ICAEW, ACCA, ICAS, CIOT, ATT or AAT.
• For audit work, check the FRC register of auditors.
• Ask about fixed fees, who actually handles your work, sector experience, and whether they work with Xero/QuickBooks/Sage.
• Use the ICAEW “Find a Chartered Accountant” or ACCA “Find an Accountant” directories.
• Get 2–3 quotes. A good local firm often beats a big brand for a small UK business.

Short version: Big Four for large corporates; BDO, Grant Thornton, RSM, Forvis Mazars, Evelyn Partners and Azets for mid-market; TaxAssist, Crunch, Mazuma, SJD, Nixon Williams and Brookson for small businesses/contractors; Xero, QuickBooks, Sage and FreeAgent for the software most UK businesses actually use.

The Big Four—PwC, Deloitte, EY, and KPMG—dominate the UK accounting market, particularly for larger companies, audits of listed firms, and complex advisory work.

Recent rankings (based on UK fee income/revenue for periods ending in 2024–2025) consistently place them at the top:

• PwC: Currently the largest in the UK by revenue (around £6.35–6.36 billion). Strong global reach and broad services.
• Deloitte: Close behind (around £5.68 billion UK revenue). Known for its scale and international network.
• EY: Around £3.7–3.78 billion. Focuses on areas like financial services, energy, and technology.
• KPMG: Around £2.99 billion (UK standalone). Strong in risk management and certain technology partnerships.

These firms handle the vast majority of FTSE 100/350 audits and serve major corporates, though they also work with mid-sized clients.

Mid-tier firms are popular alternatives, especially for SMEs, owner-managed businesses, regional needs, or more personalised service. Standouts by revenue include:

• BDO (over £1 billion) — Strong in SME tax, audit, and advisory.
• Grant Thornton and RSM — Solid national presence and mid-market focus.
• Others frequently mentioned: Azets (wide geographic reach, SME emphasis), Forvis Mazars/Mazars, Evelyn Partners, Moore UK, and growing players like MHA, Sumer, or Crowe UK.

Choice often depends on your business size, location, sector, and needs (e.g., audit vs. tax advice vs. advisory). The Big Four suit large or complex requirements, while mid-tier firms can offer competitive pricing and deeper attention for smaller or growing businesses. Many UK businesses also work with smaller local or specialist accountants for day-to-day compliance.

For the software/products people actually use (especially sole traders, freelancers, and SMEs), cloud-based platforms dominate due to HMRC’s Making Tax Digital (MTD) requirements for VAT and (increasingly) Income Tax Self Assessment. The most popular and widely recommended are:

• Xero — Often cited as the top or most-used cloud platform for UK small businesses and accountants. Praised for its clean interface, bank feeds, app ecosystem (hundreds of integrations), reporting, and MTD compliance. Scales well for growing firms.
• QuickBooks Online (Intuit) — Very popular, especially for sole traders and growing businesses. Strong on invoicing, reporting, cash flow tools, and MTD support. Frequently paired with accountant workflows.
• Sage Accounting — A long-established UK favourite, particularly valued for payroll integration, compliance, and use by traditional accountants. Good for established businesses needing robust features.

Other well-used options include:

• FreeAgent — Excellent for sole traders, freelancers, and small limited companies (often free or low-cost with qualifying business bank accounts like NatWest Group).
• Budget or specialist picks like Zoho Books (strong free tier) or others for very small setups.

Many UK accountants recommend or support Xero and QuickBooks specifically, and these tools integrate with banks and other business apps.

Recommendations depend on your situation: For a large company or complex needs, start with one of the Big Four or a strong mid-tier firm like BDO. For most small businesses or self-employed people in the UK, pair a popular platform like Xero or QuickBooks with a local accountant or one of the mid-tier firms. Always check current pricing, MTD compliance, and reviews, and consider consulting a few options or using directories like those from professional bodies. Requirements can vary by business type, so verifying directly with providers or an adviser is wise.