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Tax Advisory Companies in Southampton: 112 Active Firms (2026)
Tax advisory companies in Southampton advise businesses on compliance, planning and transactions across the city and surrounding metro area.
Buyer demand usually sits with finance directors, owner-managers and in-house finance teams rather than procurement departments. The buying centres are recurring compliance, transaction-led tax work and specialist advice on corporation tax, VAT, employment taxes and HMRC enquiries. For Southampton-area practices, the commercial fit is typically SME and mid-market: clients large enough to need planned advice, but often without a full in-house tax function. Engagements tend to be partner-led retainers, project work around deals or restructuring, and discrete support when compliance risk rises.
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Southampton has 112 actively trading tax advisory companies, giving the local market a compact professional-services base rather than a broad national hub. Reported employment totals 507 people, so the visible footprint is closer to a partner-led advisory cluster than a high-volume outsourcing centre. The cohort is likely to include small specialist practices as well as accountancy-led tax teams serving Hampshire and the central South Coast, with client work shaped by owner-managed businesses, local groups and transaction support rather than centralised national mandates.
Tax work is shaped less by a single licence regime than by HMRC administration, filing deadlines and the risk profile of the client base. Advisers handling corporation tax, VAT and employment taxes need to keep client records aligned with statutory filings, enquiry responses and transaction timetables. Southampton’s market structure also matters: regional practices tend to compete on sector familiarity and access to senior advisers, while larger multidisciplinary firms can absorb cross-border, payroll and due-diligence work when a client’s affairs become more complex.
Demand appears most durable where practices combine recurring compliance with advisory work that arrives around funding, acquisitions, property decisions and workforce changes. The scarcity of sizeable regional practices suggests acquisition interest may concentrate on teams with specialist tax capability rather than general bookkeeping capacity. Automation has been taking routine preparation work out of lower-value engagements, but client-facing judgement around HMRC risk, VAT treatment and employment taxes tends to stay with experienced advisers. Southampton’s position on the central South Coast should keep the market locally anchored, though not immune from consolidation by wider accountancy groups.
112
Active firms
2026
1
Above £5M
Reported revenue
8
Recent incorporations
Since 2022
Key facts
About 1% of the trading cohort reports turnover above £5M (1 of 112 firms) — the rest sits below that revenue band.
7% of the cohort was incorporated since 2022 (8 firms), so a sizeable share is in its first few filing cycles.
Southampton tax advisers tend to sit between routine accountancy work and specialist corporate finance or legal advice.
Recurring demand often comes from payroll, VAT, owner-managed company planning, property transactions and group restructuring.
Local buyers are likely to include owner-managed companies and employers that want tax advice close to operational decisions.
The market appears split between multi-service advisory practices and smaller specialist firms, with partner-led delivery more common among narrower practices.
Top Southampton Tax Advisory companies
Basra & Basra Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides accounting, auditing and tax advisory services for individuals and businesses. Offers self‑assessment tax returns, business accounting, financial reporting, tax planning, and advice for…
Serves a mix of private individuals and small, medium and large businesses, including VAT-registered firms and clients needing specialist support, primarily in Southampton and Hampshire.
Financial Health
StableStable · 0% CAGR over 2y
Location
Roger Smallman & Co Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides chartered accountancy services to businesses and individuals, including tax planning and compliance, VAT support, bookkeeping, payroll processing, financial accounting, and advice on Making…
Serves businesses and individuals in Southampton, including business owners, employers, VAT-registered firms, CIS contractors and personal tax clients.
Financial Health
DistressedDistressed · -13% CAGR over 4y
Location
J & S Accountants Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides accountancy and tax advisory services for individuals and businesses, including preparation of business accounts, payroll and VAT returns, company secretarial support, business start‑up…
Serves a mix of businesses and individuals, including sole traders, start-ups, small companies, larger enterprises, medical specialists and hospitality businesses, mainly seeking accountancy and tax…
Financial Health
StrongStrong · Hiring · 11% CAGR over 4y
Location
ACTION TAX CONSULTING LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides tax consultancy services including technical tax and VAT advice, written guidance, and telephone consultations. Represents clients in disputes and discussions with HMRC and supports…
Serves businesses, accountancy firms and tax professionals needing specialist tax and VAT advice, support on technical matters, or representation in dealings with HMRC.
Financial Health
DistressedDistressed · -10% CAGR over 4y
Location
PFS GLOBAL SERVICES UK LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides accounting and bookkeeping services, tax advisory, payroll management, and cloud accounting support, alongside business consulting to help businesses manage finances, maintain regulatory…
Serves businesses and individuals, including SMEs, larger corporates, professional partnerships and high-net-worth individuals across diverse public and private sector industries.
Financial Health
DistressedDistressed · 1% CAGR over 2y
Location
Rowles Accountancy Services Ltd
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
HealthyHealthy · Growing · 0% CAGR over 4y
Location
Ricketts & Co. Limited
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 4y
Location
THE MILLIONS GLOBAL LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable
Location
MUHASEBECIM UK LIMITED
Trajectory
4y · 2023–NowFinancial Health
Insufficient historyInsufficient history
Location
ACCOUNTS & TRADE MANAGEMENT LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · -16% CAGR over 4y
Location
T D Gregory Office Services Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · -7% CAGR over 4y
Location
JSR MANAGEMENT & HR CONSULTANCY SERVICES LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · Hiring · 50% CAGR over 4y
Location
MRTAXMAN LIMITED
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
DistressedDistressed
Location
Business Accounting and Tax Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · 0% CAGR over 4y
Location
SILKCUT LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · 0% CAGR over 4y
Location
HOPPER WILLIAMS & BELL LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides accounting, audit and assurance, and tax advisory services to businesses and individuals. Offers payroll, VAT returns, self‑assessment, corporate finance, company secretarial support,…
Serves businesses, charities, academies and individuals in Southampton and Hampshire, with sector focus on architects, healthcare, legal, logistics, property, recruitment, travel and FCA-regulated…
Financial Health
WeakWeak · -3% CAGR over 2y
Location
HYSONS ACCOUNTANTS LLP
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides accounting and tax advisory services for businesses, charities and individuals, including audit and assurance, bookkeeping, payroll, VAT and company tax returns, financial forecasting,…
Serves private individuals, charities and not-for-profits, start-ups, owner-managed businesses and corporate companies in and around Hampshire.
Financial Health
HealthyHealthy · 0% CAGR over 2y
Location
GIBSON WHITTER LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides accountancy and tax advisory services including audit, bookkeeping, management accounts, payroll, tax compliance and planning, VAT advice, cloud accounting support, business valuations,…
Serves business owners, legal practices, medical and healthcare organisations, charities and social enterprises seeking accountancy and tax support.
Financial Health
StableStable · 4% CAGR over 2y
Location
DAVID SHORES & CO LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides chartered accountancy and business advisory services including preparation of annual accounts and financial reports, personal and corporate tax returns and planning, payroll and CIS, VAT and…
Serves individuals, self-employed professionals, and small and large businesses in the New Forest, Hampshire and across the UK seeking accountancy and tax support.
Financial Health
StableStable · -3% CAGR over 3y
Location
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsProvides accounting and tax services for businesses and individuals, including bookkeeping, VAT returns, payroll processing, tax planning and compliance, management advice, and company secretarial…
Serves companies, sole traders and individuals across Southampton and the South Coast, mainly business owners seeking accountancy and tax support.
Financial Health
StableStable
Location
ROTHMANS AUDIT LLP
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides accounting, audit and tax advisory services to businesses and individuals. Services include annual accounts preparation, bookkeeping, payroll, VAT, tax planning, business planning, company…
Serves individuals, business owners, managers and directors, from start-ups and family-run firms to multinational organisations, alongside charities, not-for-profits and international clients.
Financial Health
StrongStrong
Location
Rothmans
Trajectory
2y · 2023–NowProvides accounting, audit and tax advisory services to businesses and individuals. Services include annual accounts, bookkeeping, payroll, VAT, tax planning, business valuations, due diligence,…
Serves business owners, managers and directors, personal clients, charities and not-for-profits, and international organisations, from start-ups and family-run companies to multinationals.
Financial Health
Insufficient historyInsufficient history
Location
Winchester Bourne Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides accounting and business advisory services for businesses, charities and individuals, including preparation of annual accounts, business and personal tax planning, payroll and outsourced…
Serves businesses large and small, new businesses, charities and individuals in Winchester, across Hampshire and beyond.
Financial Health
HealthyHealthy · 0% CAGR over 4y
Location
ROTHMANS LLP
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides accounting and tax advisory services to businesses and individuals, including audits, bookkeeping, payroll, VAT, tax planning, estate planning, business valuations, due diligence, mergers…
Serves a mix of businesses, private individuals, charities and not-for-profit organisations, including business owners, managers, directors, solicitors and international clients.
Financial Health
WeakWeak · -19% CAGR over 2y
Location
Crawford Accountants Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides business accountancy services including preparation of accounts, bookkeeping, tax planning and compliance, VAT returns, and payroll processing, along with financial advice to help businesses…
Serves owner-managed and growing businesses of varying sizes near Portsmouth and across Hampshire, with a focus on business clients seeking regular accountancy support.
Financial Health
StableStable · 0% CAGR over 4y
Location
ALEXANDER VAUGHAN LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides accountancy and tax advisory services for businesses and individuals, including bookkeeping, management accounts, payroll, VAT returns and tax planning. Advises on R&D tax credits, corporate…
Serves individuals and businesses seeking accounting, tax, payroll and advisory support, with specific emphasis on small businesses using Xero and companies needing corporate finance, R&D tax credit…
Financial Health
StableStable · -7% CAGR over 4y
Location
Argus Accounting Services Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · 0% CAGR over 4y
Location
KNIGHT GOODHEAD LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides chartered accountancy services including statutory audits, tax planning, financial reporting and business advisory. Supports small and growing businesses, startups and charities with…
Serves businesses of varied types, start-ups and charities, targeting business owners, finance leaders and charity trustees needing chartered accountancy support.
Financial Health
StrongStrong · Growing · 0% CAGR over 5y
Location
DIAMOND ACCOUNTING (SOUTHERN) LTD
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsProvides accountancy services including bookkeeping, payroll processing, VAT returns, management accounts, and tax compliance. Also offers business advisory and financial coaching, with specialist…
Serves startups, SMEs and larger corporations across Hampshire and the UK, with a particular focus on hospitality businesses such as hotels, restaurants, bars and venue operators, alongside clients…
Financial Health
StrongStrong · Hiring · 33% CAGR over 4y
Location
Hub Accountants Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides accountancy services including annual accounts preparation, bookkeeping, payroll, corporate and personal tax compliance, and wealth management. Advises businesses on performance improvement,…
Serves businesses, especially startups and small owner-managed companies, needing accountancy, tax and payroll support. Also sells to business owners seeking growth advice, including firms with VAT,…
Financial Health
StrongStrong · Hiring · 46% CAGR over 4y
Location
Magic Numbers (UK) Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · 0% CAGR over 4y
Location
AMCOTSHIRE LTD.
Trajectory
4y · 2023–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
StrongStrong
Location
KUMAR ASSOCIATES LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
WeakWeak · Hiring · 5% CAGR over 2y
Location
Business Bar Associates Limited
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides accounting and tax services for businesses, including bookkeeping, financial reporting, tax planning and compliance. Offers business advice and support on day‑to‑day financial management to…
Serves business owners and companies in Hampshire, primarily B2B clients seeking ongoing accountancy and finance support tailored to their requirements.
Financial Health
StableStable · 0% CAGR over 2y
Location
BOLER WISEMAN LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides accountancy, tax advisory and business advisory services for businesses, including financial accounting, bookkeeping, VAT returns, payroll management and business development guidance, with…
Serves businesses and professionals needing accounting, tax, bookkeeping, VAT and payroll support, with clients across the south of England, including London, plus national and international clients.
Financial Health
WeakWeak · 0% CAGR over 2y
Location
KS Accountancy & Taxation Solutions Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides accountancy and tax services to individuals and businesses, including bookkeeping, accounts preparation, VAT returns, payroll administration, corporate and personal tax returns, tax…
Serves individuals and local businesses around Winchester, including sole traders, partnerships, LLPs, limited companies, landlords, trusts, and personal tax clients.
Financial Health
StableStable
Location
Support4.Biz (New Forest) Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StrongStrong · Growing, Hiring · 19% CAGR over 4y
Location
Eight Tax & Accountancy Services Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
StableStable · Hiring · 145% CAGR over 2y
Location
RTDTR ACCOUNTING LTD
Trajectory
4y · 2023–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
DistressedDistressed · 0% CAGR over 2y
Location
Bell & Co. (Accountancy Services) Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · -16% CAGR over 4y
Location
Summit Accounting & Consulting Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides outsourced accounting and bookkeeping services including payroll, tax returns and management accounts. Also offers business consultancy, fractional CFO support, mergers and acquisitions…
Serves ambitious growing businesses, owners and senior leaders, including SMEs and mid-market firms seeking outsourced finance leadership, accounting support, transformation advice, investment, M&A…
Financial Health
DistressedDistressed
Location
Ledger Accounting Services Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides accounting and bookkeeping services for small and medium-sized businesses, including VAT returns, tax services, payroll, financial accounts, management accounts, cash flow forecasting, cloud…
Serves small and medium-sized businesses and business start-ups, including employers, VAT-registered firms and construction-sector businesses subject to CIS.
Financial Health
StrongStrong · Hiring · 47% CAGR over 2y
Location
Switch Accounting Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · -16% CAGR over 4y
Location
ALACRIS PROJECT SERVICES LIMITED
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak
Location
Northover & Co Accountants Ltd
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides accountancy and tax services for businesses and individuals, including bookkeeping, business accounting, payroll, VAT returns, corporate tax planning, company secretarial support,…
Serves businesses, start-ups and company directors needing accountancy and tax support, alongside individuals seeking personal tax, estate planning, retirement planning and self-assessment services.
Financial Health
StrongStrong · Growing, Hiring · 5% CAGR over 2y
Location
DAVVAT LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
Location
Powers And Company (2000) Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable
Location
THE ACCOUNTING STUDIO (CONSULTING) LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
HealthyHealthy · 0% CAGR over 2y
Location
Coastal Finance Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · Hiring · 15% CAGR over 5y
Location
Blackmore May Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
Location
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How Southampton Tax Advisory companies work and how to sell to them
What they do
Southampton-area tax advisory firms earn mainly from professional services rather than software, licences or advertising. Revenue usually mixes annual compliance retainers, time-based advisory work and fixed-fee projects for defined matters such as VAT reviews, employment-tax checks, transaction support or HMRC correspondence. Smaller clients may buy a recurring package bundled with accounts support, while larger regional businesses tend to brief advisers on specific risks or events. The service shape is knowledge labour: partner judgement, technical research, filings, written advice, client meetings and evidence packs. Margins depend on utilisation, fee recovery, staff leverage and the ability to turn repeat compliance contact into advisory work without over-servicing lower-value clients.
Who they sell to
Most client demand comes from owner-managed businesses, regional groups and finance teams that need tax expertise but do not carry a specialist in-house function. The economic buyer is often a finance director, managing director, owner-manager or group controller; employment-tax work may involve HR and payroll leads, while transaction mandates can arrive through lawyers, lenders or corporate-finance advisers. Procurement is usually relationship-led rather than formal, although mid-market clients may ask for written proposals, scopes and fee caps. Sales cycles tend to be short for compliance transfers and enquiry support, but longer for advisory retainers where the buyer is replacing an incumbent adviser or consolidating several services.
What they buy
Most tax advisory practices tend to spend on tools and services that protect chargeable time, reduce filing risk and improve client handling. Common categories include practice management, workflow, time recording, billing, tax computation, document management, secure client portals, e-signature, CRM and marketing systems for referral follow-up. Cyber security, cloud hosting, backup, email protection and access control matter because practices hold payroll, personal and corporate tax information. They also buy technical tax training, AML support, professional indemnity advice, recruitment, outsourced bookkeeping capacity, content support and specialist contractors for peak workloads. For larger regional practices, integration between client records, workpapers and billing can be as important as the individual application.
Why and how to sell to them
Tax advisory buyers tend to evaluate vendors when workload outgrows partner oversight, when a new service line is added, when fee recovery slips, or when client records become too fragmented to support HMRC deadlines and enquiry responses. Hiring tax managers, taking on more mid-market clients, acquiring a smaller practice or moving work into cloud-based processes can all create intent. Outbound that works is usually specific: fewer missed deadlines, faster document collection, cleaner evidence trails, better recovery of chargeable work, or lower risk around personal and corporate tax information. Generic efficiency claims are less persuasive than showing how a practice can protect partner time during compliance peaks and transaction-heavy periods.
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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Frequently asked questions
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