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Tax Advisory Companies in the UK: 9,800+ Active Firms (2026)
Tax advisory companies in the UK advise businesses and individuals on planning, compliance and reporting across domestic tax regimes.
Buying centres tend to sit with finance directors, owners, private-client teams and in-house tax functions rather than procurement alone. Work is usually sold as a mix of recurring compliance support, advisory retainers and project mandates around transactions, restructurings, international expansion or employment arrangements. The customer base is weighted towards mid-market and enterprise clients, with high-net-worth advisory and institutional work sitting alongside corporate accounts. Engagements are relationship-led, often requiring sector specialists and HMRC-facing experience, so the relevant firms are closer to multi-disciplinary professional-services practices than narrow filing shops.
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9,835 tax advisory companies are actively trading in the UK, making this a broad professional-services market rather than a small specialist niche. Reported employment totals 4,474 people, pointing to a visible staffed segment but also a long tail of adviser-owned practices where partner time and external contractors may matter more than salaried scale. The market is therefore split between national service-line providers, regional accountancy-led advisers and smaller specialist teams built around corporate, indirect, employment and transaction tax work.
HMRC sits at the centre of the operating context, both as the counterparty for compliance work and as the authority that shapes enquiry risk. Advisory practices need defensible positions on corporate tax, indirect tax, employment tax and transaction tax, with documentation that can survive scrutiny from clients, auditors and tax authorities. Market structure is also shaped by liability and reputation: complex advisory work tends to favour multi-disciplinary teams with review processes, while more routine compliance can sit with smaller practices or outsourced finance providers.
Demand appears tied less to new company formation than to complexity in client balance sheets, transactions and cross-border operations. Larger practices should retain an advantage where advice spans multiple tax lines and requires documented review, but smaller specialists can still defend narrow mandates where expertise is scarce. Consolidation may continue around regional accountancy groups and advisory boutiques, especially where succession planning meets client demand for broader coverage. Margin pressure is likely to remain in routine compliance, pushing differentiated firms towards advisory work that carries more judgement and liability.
9,835
Active firms
2026
65
£5M-plus firms
annual revenue
1,231
Recent incorporations
since 2022
Key facts
About 1% of the trading cohort reports turnover above £5M (65 of 9,835 firms) — the rest sits below that revenue band.
12% of the cohort was incorporated since 2022 (1,231 firms), so a sizeable share is in its first few filing cycles.
Tax advisory work typically spans planning, compliance and reporting, serving both business and individual clients.
High-volume compliance practices and specialist planning advisers tend to have different sales motions, with repeat filing work sitting alongside case-by-case advisory mandates.
Buyer choice is often shaped by sector familiarity, fee certainty and the adviser's appetite for interpretation risk.
More complex client groups usually need reporting support alongside planning, making documentation and audit trails part of the service model.
Top UK tax advisory companies
WATTS GREGORY LLP
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsProvides audit and assurance, accounting, tax compliance, and business advisory services. Offers corporate finance, restructuring, payroll, outsourced accounting, and wealth and tax planning services…
Serves growth-focused UK businesses and organisations across agribusiness, automotive, real estate, education, energy, financial services, healthcare, manufacturing, not-for-profit, retail,…
Financial Health
HealthyHealthy · -5% CAGR over 1y
Location
CLARITAS TAX LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides tax advisory and compliance services to businesses and individuals, including corporate and international tax, VAT, transfer pricing, employment taxes, transaction tax advice, valuations,…
Serves UK businesses needing corporate or transaction-related tax support, private clients managing personal wealth, and ambitious professional services firms through a membership network.
Financial Health
StrongStrong · Hiring · 26% CAGR over 4y
Location
RODL & PARTNER LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides legal, tax, audit and business advisory services to companies, including corporate and employment law, international tax and transfer pricing, financial statement audits, risk and compliance…
Serves businesses with national and international operations, public-sector bodies, healthcare and social-economy organisations, real estate and finance clients, and private clients.
Financial Health
StrongStrong · Growing, Hiring · 42% CAGR over 2y
Location
AMS ACCOUNTANTS GROUP LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides accountancy and professional advisory services including audit, accounting, tax advisory, corporate finance and business recovery. Supports businesses with financial reporting, tax…
Serves mid-market businesses and their leadership teams across sectors, including companies requiring audit, accounting, tax, corporate finance and advisory support.
Financial Health
HealthyHealthy · -14% CAGR over 4y
Location
AAB UK Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides accounting and professional advisory services including audit and assurance, tax compliance and planning, payroll, corporate finance, restructuring and insolvency, HR consulting, and…
Serves businesses and organisations needing audit, tax, payroll, HR, restructuring and advisory support, plus private clients and high net worth individuals. Targets sectors including construction,…
Financial Health
WeakWeak · -8% CAGR over 4y
Location
PKF SMITH COOPER HOLDINGS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides accounting and business advisory services including audit, tax compliance and advisory, management accounting, bookkeeping, company secretarial support, and statutory financial statements.…
Serves businesses and private clients, including start-ups, company directors, shareholders, farms and landed estates, and organisations needing audit, tax, corporate finance, restructuring or…
Financial Health
StableStable · -65% CAGR over 4y
Location
BRYDEN JOHNSON LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides accountancy and business advisory services including accounts preparation, audit and compliance, business and personal tax planning, payroll, company secretarial services, and digital…
Serves owner-managed, established, high-growth and start-up businesses, plus high-net-worth individuals across London, Surrey and Croydon, including property, professional services, media/tech,…
Financial Health
HealthyHealthy · Growing · 1% CAGR over 4y
Location
AMS AUDIT LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides audit, accounting and tax advisory services to businesses, alongside corporate finance and business recovery support. Assists clients with financial reporting, regulatory compliance,…
Serves mid-market businesses across multiple sectors, targeting owners, directors and finance leaders at companies seeking professional services support through the business lifecycle.
Financial Health
WeakWeak · -66% CAGR over 4y
Location
VERA GROUP LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides international tax advisory, accounting and tax compliance services. Offers corporate and fiduciary administration, trust and estate planning, family office and relocation support, and fund…
Serves a mix of B2B and private clients, including international corporations, entrepreneurs, institutional investors, non-profit organisations, expatriates, high-net-worth individuals and families.
Financial Health
WeakWeak
Location
HAINES WATTS BRISTOL (HOLDINGS) LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides accountancy and advisory services including audit and assurance, corporate and private tax, VAT, and R&D tax support. Also offers outsourced finance functions such as payroll, company…
Serves ambitious UK businesses from small teams to AIM-listed firms, plus charities, non-profits, financial institutions, technology companies, property firms, private clients, landlords and sole…
Financial Health
StableStable · Hiring · 5% CAGR over 2y
Location
KNOX CROPPER LLP
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides accountancy and advisory services including audit and assurance, tax and VAT advice, compliance and governance support. Works with businesses, charities and other not‑for‑profit…
Serves UK businesses from corporates and subsidiaries to SMEs, professional practices, sole traders and start-ups, plus not-for-profit organisations, charities, housing associations, education…
Financial Health
StableStable · Hiring · 9% CAGR over 2y
Location
ALLIOTTS LLP
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides chartered accountancy and business advisory services, including audit and assurance, tax planning and compliance, corporate finance, outsourced finance functions, payroll, and company…
Serves businesses, not-for-profits and private clients, including charities, education bodies, technology and media companies, property investors, high-net-worth individuals, expats, and…
Financial Health
StrongStrong · Hiring · 9% CAGR over 4y
Location
JOHNSONS FINANCIAL MANAGEMENT LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides chartered accountancy services including statutory and external audits, accounts preparation, bookkeeping, payroll, VAT and tax advisory. Also advises on risk management, due diligence,…
Serves individuals, owner-managed businesses and larger UK organisations, including groups, PLCs, limited companies, partnerships, LLPs, charities, nonprofits, public interest entities and UK…
Financial Health
StrongStrong · Growing, Hiring · 26% CAGR over 2y
Location
BEAVIS MORGAN LLP
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides accountancy, audit, tax and business advisory services to companies and individuals. Services include corporate finance, restructuring, estate planning, bookkeeping, payroll, VAT returns,…
Serves businesses and individuals, including owner-managed firms, high-net-worth individuals, landed estates and organisations in capital markets, construction, hospitality, manufacturing, media,…
Financial Health
StableStable · -84% CAGR over 3y
Location
OLIVER CLIVE & CO LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides accounting, audit and assurance, tax advisory, bookkeeping, payroll, and outsourced finance services. Also delivers corporate finance, insolvency and restructuring, valuations, and HR and…
Serves businesses, individuals and some public sector and not-for-profit organisations. Targets SMEs and larger organisations across sectors including agriculture, education, financial services,…
Financial Health
WeakWeak · 0% CAGR over 3y
Location
Carbon Accountancy Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides accountancy and financial advisory services including company accounts preparation, business audits, tax compliance and planning, bookkeeping, payroll, corporate finance, business…
Serves startups, SMEs and international groups across the UK and internationally, including listed companies, UK subsidiaries, charities and businesses in technology, retail/hospitality, property,…
Financial Health
HealthyHealthy · Hiring · 6% CAGR over 4y
Location
ROBERTSON CRAIG LLP
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsProvides chartered accountancy and specialist tax advisory services, including corporate and personal tax planning, tax compliance, business structuring, succession and exit planning, transaction tax…
Serves entrepreneurs, privately owned businesses, business-owning families and high-net-worth individuals across Scotland, plus accountants, lawyers and other professional advisers with complex…
Financial Health
DistressedDistressed · -7% CAGR over 1y
Location
Nyman Libson Paul LLP
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides accountancy, audit and assurance, taxation, and business advisory services. Advises companies and individuals on financial management, tax planning, R&D and creative industry tax relief, and…
Serves entrepreneurs, established businesses and private clients, with a focus on arts, media and entertainment, plus healthcare, hospitality, manufacturing, professional services, property, retail,…
Financial Health
HealthyHealthy · Profitable, Hiring · 8% CAGR over 2y
Location
McMillan & Co LLP
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides audit, accounting, tax and business advisory services. Works with owner‑managed businesses, regional companies, UK subsidiaries of overseas groups, charities and high‑net‑worth individuals…
Serves owner-managed businesses, large regional businesses, UK subsidiaries of overseas groups, charities and high net worth individuals across the UK.
Financial Health
HealthyHealthy · Hiring · 8% CAGR over 2y
Location
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides UK tax advisory, accounting, and compliance services for overseas companies operating in or trading with the UK. Services include corporation tax, VAT, payroll, HR and employment compliance,…
Serves international businesses trading in or with the UK, including overseas parent companies with UK subsidiaries, engineering and construction firms, importers, e-commerce traders, overseas…
Financial Health
StrongStrong · Growing · 2% CAGR over 2y
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides fiduciary, corporate and tax advisory services for private clients and businesses, including wealth structuring, family office support, trust and estate planning, accountancy, tax…
Serves high-net-worth private clients, families and family offices, as well as entrepreneurs, UK businesses, and individuals or businesses coming to or investing in the UK.
Financial Health
WeakWeak · -2% CAGR over 4y
Location
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides accounting and advisory services including audit and assurance, corporate and personal tax planning, bookkeeping, payroll, and cloud accounting. Advises businesses, charities and individuals…
Serves small, medium and large UK and international businesses, subsidiaries of international groups, charities and not-for-profits, business owners, company directors, self-employed people and…
Financial Health
StableStable · 2% CAGR over 3y
Location
CHARTERHOUSE (ACCOUNTANTS) LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides accounting and tax advisory services for businesses and individuals, including management accounting, payroll, auditing, corporate finance, business planning, company restructuring, mergers…
Serves UK businesses and individuals, particularly SMEs, corporates, start-ups and high-net-worth clients. Also targets property owners and portfolios, with services aimed at business owners needing…
Financial Health
WeakWeak · -71% CAGR over 4y
Location
Wright Vigar Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides chartered accountancy and business advisory services including audit, bookkeeping and accounts preparation, corporate and personal tax planning, payroll administration, VAT and R&D tax…
Serves businesses, charities, academies, professionals and individuals, with sector focus including agriculture, healthcare, hospitality, manufacturing, property, retail, technology, transport and…
Financial Health
HealthyHealthy · Profitable, Hiring · 6% CAGR over 2y
Location
SEDULO BIDCO LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides business advisory and financial consultancy services including accounting, audit, tax planning, corporate finance and deal advisory, forensic accounting, payroll, funding and mortgage…
Serves UK SMEs, corporate entities, entrepreneurs, not-for-profits and private clients, including individuals with business growth, exit and wealth protection needs.
Financial Health
DistressedDistressed · -89% CAGR over 2y
Location
UHY HACKER YOUNG FITCH LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides accounting and advisory services including audit and assurance, corporate tax and VAT, corporate finance, payroll, cloud accounting, financial planning, and business recovery, serving…
Serves owner-managed and mid-market businesses, academy schools, charities, professional practices, FCA-regulated firms and private clients across sectors including automotive, healthcare, property,…
Financial Health
StrongStrong · Hiring · 5% CAGR over 4y
Location
HW FISHER SERVICE LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides chartered accountancy services including audit, tax planning and compliance, corporate finance, and financial advisory. Advises businesses, entrepreneurs, and high‑net‑worth individuals…
Serves entrepreneurial SMEs, large corporates and high-net-worth individuals, with sector focus on property, hospitality, not-for-profit, sports, technology, financial services, media and…
Financial Health
HealthyHealthy · -1% CAGR over 5y
Location
HENTONS (YORK) LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides accountancy and business advisory services including audit, accounts preparation, tax compliance, payroll, financial planning, corporate finance, bookkeeping and company secretarial support,…
Serves UK businesses and organisations of varying sizes, including start-ups, SMEs, owner-managed firms, academies, charities, farms, healthcare providers, manufacturers, motor trade, media,…
Financial Health
StableStable · -65% CAGR over 4y
Location
Parker Russell Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides chartered accountancy, audit and assurance, tax planning and compliance, and corporate finance advisory. Services include company formation, mergers and acquisitions support, due diligence,…
Serves SMEs, growth companies and private clients, including fintechs, banks, professional practices, property and construction firms, manufacturers, retailers, nonprofits, travel, ecommerce,…
Financial Health
StrongStrong · Growing, Hiring · 29% CAGR over 2y
Location
KNAV SERVICES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides tax, accounting, assurance and advisory services. Offers statutory audits, corporate and international tax advice, VAT and individual tax compliance, valuation services, financial reporting…
Serves individuals, startups and small businesses, as well as companies with cross-border UK-US operations, M&A activity, reporting, valuation or compliance needs.
Financial Health
StrongStrong · Hiring · 28% CAGR over 4y
Location
Curo Professional Services Ltd
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides chartered accountancy and tax advisory services to businesses and individuals, including audit, financial statement preparation, statutory compliance, business tax planning, personal tax and…
Serves owner-managed businesses, small to large companies, complex groups and UK subsidiaries of overseas parents, plus individuals, families and business owners. Sectors include property,…
Financial Health
HealthyHealthy · Growing, Hiring · 6% CAGR over 2y
Location
LB GROUP LIMITED
Trajectory
5y · 2019–NowFinancial sub-scores
Computed from 5 filingsProvides accountancy, audit, tax planning, payroll, corporate finance and business advisory services, including mergers and acquisitions support, cloud accounting, digital transformation and property…
Serves SMEs and organisations in education and academies, haulage and logistics, hospitality, media, entertainment and sport, professional services and recruitment, plus property owners and private…
Financial Health
HealthyHealthy · -3% CAGR over 4y
Location
HURST ACCOUNTANTS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides audit and accounting services, tax advisory, and business advisory support. Offers corporate finance assistance, digital transformation consulting, and advice on employee ownership trusts,…
Serves privately owned and family businesses, entrepreneurs and business owners, including internationally mobile clients, across lifestyle and leisure, manufacturing and engineering, and technology,…
Financial Health
StableStable · -65% CAGR over 4y
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides accounting, auditing and tax advisory services to businesses and individuals. Services include accounts production, bookkeeping, payroll, VAT, corporate finance, corporate and personal tax…
Serves owner-managed businesses, large UK corporations, partnerships and sole traders across London and the South East, spanning a wide range of sectors.
Financial Health
StableStable · -68% CAGR over 4y
Location
The Rowleys Partnership Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides accountancy and advisory services including audit, financial reporting, outsourced accounting, payroll, and tax planning and compliance. Also offers wills and probate, corporate finance,…
Serves B2B and nonprofit clients, including owner-managed SMEs, start-ups, family businesses, mid-market and private equity-backed companies, medical practices, solicitors, charities, pension schemes…
Financial Health
HealthyHealthy · 3% CAGR over 2y
Location
MERCER & HOLE GROUP LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides accountancy, audit and assurance, tax advisory and compliance, payroll, corporate finance, restructuring and insolvency, financial planning, and forensic accounting services for businesses,…
Serves businesses, charities and private clients, including SMEs, startups, LLPs, partnerships and sole traders, plus sectors such as property, healthcare, manufacturing, financial services, retail,…
Financial Health
WeakWeak · -89% CAGR over 2y
Location
Botham Accounting Limited
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides accountancy and tax services to businesses and individuals, including audit, bookkeeping, payroll, financial statements, management accounts and VAT. Also offers tax planning, HMRC…
Serves businesses and their owners, academy trusts, healthcare organisations, property and construction firms, renewables businesses, and individuals with personal tax needs.
Financial Health
HealthyHealthy · Growing, Hiring · 19% CAGR over 3y
Location
AVENTUS PARTNERS LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides accounting, audit and assurance, tax advisory, and financial reporting services. Supports businesses with financial management, compliance with HMRC and statutory requirements, company…
Serves UK fast-growing businesses and global inbound companies setting up in the UK, across sectors such as retail and manufacturing, plus corporate and personal clients needing finance support.
Financial Health
HealthyHealthy · Hiring · 12% CAGR over 2y
Location
Inspired Corporate Advisory Ltd
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsProvides tax advisory, compliance, and recovery services for businesses, covering federal, state, local, and international taxes. Develops tax software and technology tools and offers consulting,…
Serves tax departments and finance leaders at multinational and large enterprise companies, including Global 5000 corporations, across sectors such as financial services, healthcare, manufacturing,…
Financial Health
HealthyHealthy · Hiring · 38% CAGR over 3y
Location
Westcotts (SW) LLP
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides audit, accounting and tax services to businesses and individuals, including compliance, payroll, VAT and business taxation. Also offers corporate finance, insolvency and recovery, probate,…
Serves SMEs, owner-managed businesses, charities, education providers, professional practices, landed estates, agricultural, hospitality, manufacturing, technology and renewables clients, plus…
Financial Health
StableStable · Profitable · 2% CAGR over 2y
Location
Edwards and Keeping Limited
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsProvides accounting and tax advisory services for businesses and individuals, including accounts preparation, tax compliance and planning, business advisory, and cloud accounting support using…
Serves owner-managed firms, SMEs, larger corporates, self-employed people and high-net-worth individuals, with sector focus on agriculture and landed estates, manufacturing, contractors, charities…
Financial Health
StrongStrong
Location
Haines Watts South West LLP
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides chartered accountancy and business advisory services, including accounting, auditing, payroll, outsourced finance functions, and tax advisory. Offers corporate and personal tax planning, VAT…
Serves owner-managed businesses, entrepreneurs and business leaders, including those starting, growing, buying, selling or exiting companies, plus not-for-profit and voluntary sector organisations…
Financial Health
WeakWeak · -8% CAGR over 2y
Location
Edwards Veeder (UK) Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides accountancy and advisory services to businesses including audit, tax compliance, bookkeeping, payroll, corporate finance, company secretarial support, business consultancy, and independent…
Serves UK businesses of all sizes, from sole traders and owner-managed firms to larger companies and PLCs, across multiple sectors.
Financial Health
StableStable · Hiring · 4% CAGR over 4y
Location
Rotherham Taylor Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides chartered accountancy and tax advisory services to businesses and individuals, including audit, bookkeeping, payroll, corporate finance, business recovery, company secretarial support,…
Serves start-ups, established businesses, family firms, charities and sector-specific clients, alongside individuals needing tax, estate, probate and wealth-related support, with clients nationally…
Financial Health
StrongStrong · Growing, Hiring · 7% CAGR over 4y
Location
OPASS BILLINGS WILSON & HONEY LLP
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsProvides accountancy and business advisory services including financial accounting, tax planning and compliance, audit and assurance, payroll outsourcing, cloud accounting, and corporate finance…
Serves businesses and private clients needing accountancy, tax, payroll, audit and corporate finance support, with particular focus on education and academies, transport and logistics, hospitality,…
Financial Health
HealthyHealthy · 0% CAGR over 3y
Location
RICHARDSON JONES LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides chartered accountancy services including annual financial statements, statutory and specialist audits, taxation, payroll and HR support. Offers management accounts, estate planning, business…
Serves businesses and individuals, from multinational listed companies with UK and overseas subsidiaries to local businesses, sole traders and personal tax clients.
Financial Health
StableStable · 3% CAGR over 2y
Location
HARRIS BASSETT LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides accounting and business advisory services including auditing, bookkeeping, payroll, tax planning, VAT advice, corporate finance, restructuring support, and probate and estate administration…
Serves UK businesses, charities and individuals, with sector focus on construction, health and social care, hospitality, manufacturing and engineering, professional services, property, recruitment…
Financial Health
StrongStrong · Growing, Hiring · 18% CAGR over 3y
Location
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides audit, accountancy and tax services for businesses and individuals. Prepares statutory accounts and offers bookkeeping, payroll, VAT returns, management accounts and business forecasts, and…
Serves SMEs, large corporates, sole traders, partnerships, company groups and high-net-worth individuals across multiple sectors needing UK accountancy, audit and tax support.
Financial Health
StableStable · -15% CAGR over 2y
Location
KNOWLES WARWICK LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides accountancy and tax advisory services including audit, bookkeeping, payroll, VAT, corporate and personal tax planning, company secretarial support, and business advisory such as strategic…
Serves private individuals and businesses, including charities, contractors, healthcare practices, care homes, technology firms, manufacturers, property landlords, self-employed professionals and…
Financial Health
StableStable · -67% CAGR over 4y
Location
Charter Tax Consulting Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides accountancy and tax advisory services for businesses and private clients. Services include accounts preparation, corporate and personal tax compliance and planning, bookkeeping, VAT support,…
Serves businesses, owner-managed companies and new ventures, plus high-net-worth private clients in the UK and internationally, including non-domiciled residents, expats, UK property investors, and…
Financial Health
StrongStrong · Growing, Hiring · 9% CAGR over 5y
Location
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How UK tax advisory companies work and how to sell to them
What they do
Tax advisory firms earn revenue from partner-led advice, recurring compliance programmes and project work tied to transactions, reorganisations, international tax, VAT, employment arrangements and private-client planning. Pricing is typically a mix of time-based fees, fixed scopes for defined deliverables and retainers where clients need year-round access to specialist judgement. The service shape is mostly professional advice rather than software or outsourced filing alone: clients pay for interpretation, documentation, negotiation with HMRC and the ability to stand behind a position if challenged. Routine compliance work tends to be lower-margin, while advisory mandates carry higher fees because they require senior review and liability management.
Who they sell to
Most tax advisory firms sell to finance directors, CFOs, owners, in-house tax teams, private-client advisers and professional-services intermediaries. Mid-market companies usually buy through direct relationships, referrals and annual compliance cycles, while enterprise and institutional clients may use formal panels, procurement checks or RFPs for larger mandates. Private-client work is more relationship-led, often involving trustees, wealth advisers or family-office teams rather than a conventional procurement process. Sales cycles vary by urgency: deadline-driven compliance can convert around established filing dates, while transaction tax, restructuring and cross-border planning usually need partner meetings, conflict checks and review of the underlying commercial facts.
What they buy
Most tax advisory firms tend to spend on systems that protect margin, evidence and client communication. Common categories include practice management, time recording, billing, workflow, document management, secure client portals, CRM, knowledge management, tax research, analytics and deadline tracking. Larger practices often need data security, access control, audit trails, integration with accounting workflows and reporting across service lines. Smaller specialists may prioritise case management, marketing support, recruitment, professional indemnity cover, CPD training and outsourced IT. Sellers should expect careful scrutiny where a tool touches client data, advice files or HMRC correspondence, because operational convenience is secondary to confidentiality and defensible record-keeping.
Why and how to sell to them
Tax advisory buyers tend to evaluate vendors when workload grows faster than partner capacity, when compliance work is squeezing margins, or when client matters require better documentation and review. Other triggers include new specialist hires, service-line expansion, regional consolidation, a move into larger corporate clients or a rise in HMRC enquiries. Outbound angles usually land better when they connect to chargeable time, liability control, deadline discipline and client retention rather than abstract productivity claims. Credible pitches tend to show how the service fits existing review processes, preserves confidentiality and helps advisers evidence the judgement behind tax positions.
How this list is built
Data sources
This list is built from UK Companies House filings, XBRL accounts data, and semantic analysis of each company's public website. Revenue and headcount figures come from the most recent filed accounts; where the company has not filed, values are estimated using a model trained on filed history and peer benchmarks and are labelled as estimates.
Classification
Rather than relying solely on SIC codes, Firmbase classifies each company semantically: the company's website is crawled, an AI model reads what the company actually sells, and the company is placed into the relevant industry and subsectors. SIC codes are used as one signal but not the only one. This means a company that registered under a generic SIC code but pivoted into (for example) fintech is correctly identified as fintech, not as its original SIC category.
Freshness
The underlying company data is refreshed from Companies House continuously; filings appear in the list within days of submission. The curated list ordering is regenerated when the underlying data moves meaningfully (company count changes by more than 5%, a new company enters the top-ranked segment, or the filed-revenue numbers for the top firms change). You can see the last-updated timestamp near the top of the page.
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