Crunch

Shortlist: best accounting firms/brands in the UK by use case

There isn’t one “best” accountant for everyone. In the UK, the best choice depends on whether you’re a sole trader, limited company, contractor, landlord, scale-up, or large/audited business.

My top picks

---

1. Big Four: best for large companies and complex work

If you need the strongest brand, international coverage, listed-company audit, major tax advisory, transaction support, or risk consulting, the practical shortlist is:

1. PwC
2. Deloitte
3. EY
4. KPMG

These are the UK’s largest accounting firms by turnover: Accountancy Today’s 2025 ranking lists PwC at £6.35bn, Deloitte at £5.68bn, EY at £3.70bn, and KPMG at £2.99bn annual turnover. (accountancytoday.co.uk) The FRC’s audit-quality review also shows these firms as central players in the UK public-interest-entity audit market. (media.frc.org.uk)

Best for: large corporates, listed groups, regulated businesses, multinational tax, M&A, audit committees.
Not best for: a normal freelancer or small limited company unless you need a very specific specialist service.

---

2. Best mid-market firms: serious capability without always needing Big Four

For established UK businesses that need audit, tax, corporate finance, VAT, payroll, international support, or advisory — but where Big Four fees may be overkill — I’d shortlist:

• BDO
• Grant Thornton
• RSM
• Forvis Mazars
• Azets
• MHA
• Moore UK
• Evelyn Partners

BDO, Grant Thornton and RSM are especially common choices for mid-market and owner-managed businesses. In the 2025 UK rankings, BDO, Grant Thornton and RSM sit directly behind the Big Four, with reported turnovers of £1.02bn, £724m, and £543m respectively. (accountancytoday.co.uk) Accountancy Daily’s Top 75 survey also places BDO, Evelyn Partners, Grant Thornton, RSM, Azets and Forvis Mazars among the UK’s leading firms by fee income. (d1a2t1aqgesyrk.cloudfront.net)

Best for: £1m–£100m+ turnover companies, audits, group structures, funding rounds, acquisitions, international tax, VAT complexity.
My practical pick: BDO or Grant Thornton for broader advisory; RSM for strong mid-market business support; Forvis Mazars if audit/tax/international work matters.

---

3. Best for small businesses, sole traders and local support

For most UK sole traders and small limited companies, you usually do not need a Big Four or large mid-tier firm. You want someone responsive, qualified, fair on fixed fees, and comfortable with HMRC, Companies House, payroll, VAT and Making Tax Digital.

Good national small-business brand: TaxAssist Accountants

TaxAssist is one of the most visible UK small-business accountancy brands. It describes itself as a national network serving independent business owners, with more than 100,000 clients and hundreds of UK locations. (taxassist.co.uk) ACCA’s AB Magazine also reported TaxAssist as looking after over 120,000 clients across the UK, mostly small businesses. (abmagazine.accaglobal.com)

Best for: small businesses that want local face-to-face support with a recognisable national brand.
Watch out: because it’s a network, quality can vary by local office — meet the actual accountant before signing.

Good online-accountant brands

If you want a remote, fixed-fee, software-led service, look at:

• Crunch
• The Accountancy Partnership
• Mazuma
• More Than Accountants

Crunch says it has helped over 64,000 clients and combines UK-based accountants with software. (crunch.co.uk) ExpertSure’s 2026 comparison of UK online accountants highlights Crunch, More Than Accountants, The Accountancy Partnership, Mazuma, Cheaper Accountant and Taxez as common fixed-fee online options for sole traders and small companies. (expertsure.com)

Best for: contractors, freelancers, consultants, simple limited companies, straightforward VAT/payroll.
Watch out: online firms can be efficient, but if your affairs are messy, specialist, or fast-changing, a good local accountant may be better.

---

4. Accounting software products people actually use in the UK

Even if you hire an accountant, they’ll usually expect you to use cloud bookkeeping software. The “safe” mainstream choices in the UK are:

Xero

Best all-rounder for growing small businesses, VAT, payroll add-ons, integrations, ecommerce, multi-user access and accountants who like clean cloud records. Xero says its UK software supports VAT, CIS and Making Tax Digital filing. (xero.com)

QuickBooks Online

Good for small businesses wanting flexible reporting, invoicing, expenses and accountant access. QuickBooks describes its UK products as HMRC-recognised for Making Tax Digital use. (quickbooks.intuit.com)

FreeAgent

Excellent for freelancers, contractors, consultants and simple limited companies. A major UK advantage is that FreeAgent can be free with certain business bank accounts: FreeAgent says NatWest, Royal Bank of Scotland, Ulster Bank and Mettle business banking customers can get a funded FreeAgent account while they retain the bank account. (freeagent.com)

Sage Accounting

A long-established UK brand, especially familiar to accountants and older SMEs. Sage says Sage Accounting is recognised by HMRC for both Making Tax Digital for VAT and Making Tax Digital for Income Tax. (sage.com)

My simple software recommendation:

• Sole trader / contractor: FreeAgent
• Growing limited company: Xero
• Cost-sensitive small business: QuickBooks or FreeAgent
• Traditional SME / accountant already uses Sage: Sage Accounting
• Ecommerce: Xero + Link My Books/A2X, or QuickBooks if your accountant prefers it

---

5. What I’d choose in common UK scenarios

If you’re a sole trader or freelancer

Use FreeAgent or Xero, then hire a local ICAEW/ACCA accountant or use TaxAssist if you want a familiar national brand. Check whether Making Tax Digital for Income Tax applies to you: HMRC’s rollout started from 6 April 2026 for sole traders and landlords over the relevant income threshold, with further thresholds from 2027 and 2028. (gov.uk)

If you run a small limited company

Shortlist TaxAssist, Crunch, The Accountancy Partnership, or a good local chartered/certified firm. Use Xero if you expect to grow; use FreeAgent if the business is simple.

If you’re a contractor or consultant

Start with FreeAgent + a contractor-aware accountant. If you want a packaged online service, compare Crunch, The Accountancy Partnership and Mazuma. Ask specifically about IR35, dividends, salary strategy, VAT flat-rate scheme, pension contributions and director loan accounts.

If you’re an ecommerce business

Use Xero or QuickBooks Online, but choose an accountant who understands Amazon, Shopify, Stripe, PayPal, VAT, import VAT, and marketplace reconciliations. Don’t just pick the cheapest general accountant.

If you’re scaling or need an audit

Go to BDO, Grant Thornton, RSM, Forvis Mazars, Azets or MHA. These firms are much better suited than online accountants for group accounts, audit, R&D, EMI schemes, share options, funding rounds and international expansion.

If you’re wealthy or need personal tax/estate planning

Look at Evelyn Partners, Saffery, BDO Private Client, PwC, EY or a specialist private-client tax boutique.

---

6. How to avoid choosing the wrong accountant

Before signing, check:

1. Are they qualified and regulated? Use the ICAEW or ACCA directories. ICAEW says you should check qualifications and experience, and that an ICAEW Chartered Accountant or regulated firm gives you someone qualified, committed and accountable. (icaew.com) ACCA also provides a directory for finding ACCA accountancy firms. (accaglobal.com)
2. Do they understand your sector? Contractors, landlords, ecommerce sellers, creatives and agencies all have different issues.
3. What’s included in the fixed fee? Ask about VAT returns, payroll, bookkeeping, Self Assessment, Companies House filings, confirmation statement, tax planning and ad hoc advice.
4. Who will actually handle your work? Partner? Senior accountant? Trainee? Offshore team?
5. What software do they support? Xero, FreeAgent, QuickBooks and Sage are the practical mainstream choices.
6. How fast do they reply? A cheap accountant who takes three weeks to answer is expensive in stress.

---

Bottom line

For a UK user, I’d recommend:

• Best big-name firms: PwC, Deloitte, EY, KPMG
• Best serious business alternatives: BDO, Grant Thornton, RSM, Forvis Mazars
• Best SME/local brand: TaxAssist Accountants
• Best online-accountant brands: Crunch, The Accountancy Partnership, Mazuma
• Best software products: Xero, FreeAgent, QuickBooks Online, Sage Accounting

If you’re a normal UK small business, I’d start with FreeAgent or Xero + a qualified local accountant. If you’re growing fast or need audit/advisory, move up to BDO, Grant Thornton, RSM or Forvis Mazars.

Finding the “best” accounting firm in the UK isn't a one-size-fits-all decision. The right partner for you depends entirely on the size of your business and what you need them for—whether you are a FTSE-listed multinational needing complex corporate tax advisory, a scaling SME, or a local sole trader navigating Self Assessment.

Furthermore, with Making Tax Digital (MTD) for Income Tax Self Assessment (ITSA) live for sole traders and landlords earning over £50,000, having the right digital-savvy accountant is more practical than ever.

The best and most widely used accounting brands in the UK are categorised below by business size and service type.

---

1. The "Big Four" (For Multinationals, Corporates & FTSE 350)

If you run a large corporation, a listed company, or need heavy-duty international tax planning, these four firms dominate the UK market. They handle 90%+ of the FTSE 350 audits and offer unparalleled global reach.

• PwC (PricewaterhouseCoopers): The largest firm in the UK by revenue. PwC is the gold standard for high-end corporate audit, complex multinational tax structures, and digital transformation consulting.
• Deloitte: A close second in size, Deloitte is highly regarded for its corporate finance, risk advisory, and technology consulting arms. It is a favourite for businesses undergoing major mergers, acquisitions, or restructuring.
• EY (Ernst & Young): EY is highly entrepreneurial-focused, famous for its Entrepreneur Of The Year programme. They are exceptionally strong in transaction advisory services, corporate tax, and sustainability/ESG reporting.
• KPMG: Boasts a very strong regional network outside of London. They are widely respected for their corporate restructuring, tax advisory, and public sector consulting.

---

2. The Mid-Tier Giants (For Scaling SMEs & Private Wealth)

For mid-market companies, fast-growing private businesses, and high-net-worth individuals, the Big Four can be prohibitively expensive. The mid-tier firms offer identical technical expertise but with more direct partner-led attention.

• BDO: The undisputed king of the mid-tier. BDO is the go-to firm for AIM-listed businesses, fast-growing medium-sized firms, and ambitious scale-ups.
• Grant Thornton: Strongly positioned as a primary challenger to the Big Four, Grant Thornton has an extensive UK-wide office network. They excel in public sector audits, mid-market advisory, and corporate finance.
• RSM UK: Highly regarded for its mid-market focus. RSM has a great reputation for pragmatic tax advice and regional business support.
• Forvis Mazars: (Following its major global merger) Forvis Mazars is highly popular for mid-sized businesses with a European or international footprint. They are highly tech-enabled and work seamlessly with cloud platforms.
• Evelyn Partners: (Formed from Tilney and Smith & Williamson). Uniquely positioned, Evelyn is perfect if you want to seamlessly blend your corporate business accounting with personal wealth management and private client tax services.

---

3. Regional and SME Specialists (For Local Owner-Managed Firms)

If you run an owner-managed business or a regional SME, you want a firm that understands local trade, regional tax schemes (like R&D tax credits), and everyday business operations.

• Azets: A massive success story in UK accounting. Azets has built a network of over 80 offices across the UK, positioning themselves as local, trusted advisers to owner-managed SMEs. They provide highly efficient, digital-first bookkeeping, payroll, and compliance.
• Xeinadin: A rapidly growing collaborative group of local, independent UK practices. It gives you the feel of a small, local accountant backed by the resources and tech infrastructure of a massive national firm.
• Moore Kingston Smith (Moore UK): Particularly famous for dominating the creative, media, and marketing sectors. If you run an agency in London or the South East, this is often the go-to firm.
• PKF Francis Clark: The dominant force in the South West of England. They are consistently ranked among the UK's best workplaces and offer excellent corporate and private tax services.

---

4. High Street and Digital Services (For Sole Traders, Landlords & Freelancers)

If you are a contractor, freelancer, landlord, or run a small shop or trade business, you don't need a corporate firm. You need simple, affordable compliance, self-assessment filings, and help with MTD.

• TaxAssist Accountants: The UK’s largest network of high-street accountants. They operate like retail shops where you can literally walk in and talk to someone. Perfect for tradespeople, local retail, and property landlords who want a personal, face-to-face relationship without corporate jargon.
• Crunch: A pioneer in "online accounting." For a monthly fee, you get access to their easy-to-use software alongside a dedicated, qualified accountant to manage your year-end files, VAT, and payroll. Incredibly popular with contractors and single-director limited companies.

---

5. The Software Products People Actually Use

Most modern UK accountants will not do your day-to-day bookkeeping; they will expect you to keep digital records. In the UK, three main software brands dominate:

• Xero: The clear UK market leader. Almost every UK accountant is a "Xero Partner." It features seamless UK bank feeds, automatically calculates VAT, and is fully MTD-compliant. It is best for scaling businesses and small businesses with staff.
• QuickBooks Online: Xero's main rival. It is highly user-friendly and popular with sole traders and micro-businesses who want simple invoicing and expense tracking on their phones.
• FreeAgent: Excellent for freelancers, contractors, and micro-businesses. Bonus: If you have a business current account with NatWest, Royal Bank of Scotland, or Mettle, FreeAgent is completely free of charge.

Summary: Which one should you choose?

• Are you a FTSE/multinational firm? Go to PwC or Deloitte.
• Are you a fast-growing, mid-sized business looking to scale? Go to BDO, Grant Thornton, or RSM.
• Are you an established local SME/family business? Choose Azets or a strong regional player like Moore Kingston Smith.
• Are you a sole trader, landlord, or freelancer? Walk into your local TaxAssist Accountants branch, use Crunch, or set up Xero/FreeAgent and find a local independent certified accountant (ICAEW or ACCA registered).