CIS Tax Firms in London: Practical Companies Overview (2026)
AC
Acumon Chartered Accountants·12 min read
This practical guide presents a selection of companies offering CIS tax services in London, rather than ranking them from first to last. The companies vary considerably, from larger accountancy practices covering tax, payroll, VAT and bookkeeping to narrower specialists focused closely on contractors, subcontractors and CIS compliance. The overview gives context on who these companies are, the clients they serve and the areas where their experience is most relevant. It is designed to make comparisons clearer and help readers identify a company that fits their particular CIS tax and accounting requirements.
Acumon
Acumon is a UK firm of chartered accountants providing CIS tax services to contractors, subcontractors, and construction businesses in London. The firm supports businesses with the administrative and tax requirements created by the Construction Industry Scheme, including registration, verification, deductions, monthly reporting, and subcontractor payment statements.
The firm works with construction companies operating different business structures, including limited companies, partnerships, and sole traders. CIS requirements can apply both to businesses whose main activity is construction and to organisations that become deemed contractors because of their expenditure on construction operations.
For contractors, CIS creates recurring monthly responsibilities. Subcontractors need to be verified with HMRC before payment, the appropriate deduction rate must be applied, and CIS returns must be submitted each month. Acumon manages this process alongside the supporting records and payment and deduction statements required for subcontractors.
Subcontractors have different tax considerations. Acumon supports CIS registration, gross payment status applications, and the recovery or offset of CIS deductions. Sole traders and partners generally deal with deductions through Self Assessment, while limited companies can offset qualifying CIS deductions against PAYE liabilities through the Employer Payment Summary.
Construction businesses may also need to coordinate CIS with PAYE payroll and the VAT domestic reverse charge. Acumon provides CIS, payroll, VAT, and accounting services within the same practice, helping maintain consistent treatment across different HMRC filings and accounting records.
Acumon also supports businesses where CIS problems have already arisen. This can include reviewing historical records, identifying incorrect deductions or missed verifications, correcting previous errors, and assisting businesses during HMRC CIS enquiries.
CIS Tax Capabilities
Acumon provides CIS tax and compliance support for contractors and subcontractors operating in London and across the UK.
These include:
Contractor CIS registration and scheme setup
Subcontractor registration and HMRC verification
Monthly CIS return preparation and submission
CIS deduction calculations and payment statements
Gross payment status applications
CIS deduction recovery and limited company offsets
CIS work can be managed alongside payroll, with Acumon’s UK-based payroll team handling CIS administration as part of its wider payroll service.
Regulatory Licences and Registrations
Acumon operates as a UK accountancy practice with professional and corporate registrations relevant to the wider tax, payroll, accounting, and assurance services provided by the firm.
These include:
ICAEW-registered chartered accountant status
ICAEW statutory audit registration
UK company registration
UK VAT registration
Chartered Institute of Payroll Professionals qualified payroll personnel
HMRC-facing tax and payroll compliance capabilities
These professional registrations and qualifications support the firm’s wider accounting and compliance work, while CIS services are delivered by its UK-based payroll and CIS team. Acumon’s website identifies Acumon UK Limited as a company registered in England and Wales and confirms its ICAEW audit registration.
Core Services
In addition to CIS tax services, Acumon provides accounting, payroll, tax, and VAT support that can be relevant to businesses operating within the construction sector.
These include:
CIS registration and monthly compliance
Subcontractor verification and deduction administration
Payroll and PAYE administration
Self Assessment tax returns
VAT and domestic reverse charge support
Accounts and bookkeeping
Tax compliance and advisory services
CIS administration is often closely connected with other areas of construction accounting. Contractors may need to reconcile subcontractor payments with bookkeeping records, operate PAYE for employees, manage VAT treatment, and maintain supporting information for monthly CIS submissions.
For limited company subcontractors, CIS deductions can also interact with payroll reporting because deductions suffered may be offset against PAYE liabilities through the Employer Payment Summary. Acumon can manage CIS and payroll together so these reporting processes are coordinated.
Acumon works with construction businesses that are:
Registering for CIS for the first time
Paying and verifying subcontractors
Applying for gross payment status
Correcting historical CIS compliance problems
Early attention to CIS procedures can help contractors establish appropriate verification, deduction, record-keeping, and monthly filing processes before administrative errors accumulate. Acumon also provides CIS health checks and support with HMRC enquiries where businesses need to review or correct their existing position.
Address: 1-2 Craven Road, Ealing, London, W5 2UA, UK
Fusion Accountants
Fusion Accountants provides CIS tax return and construction accounting services from London and Brentford offices. Its CIS offering covers contractors that need to manage deductions and reporting as well as subcontractors seeking help with tax returns and refunds.
The firm’s wider construction service includes accounts, VAT, payroll and bookkeeping, which can be useful where CIS is only one part of a construction company’s accounting workload. Fusion also publishes specific guidance around Construction Industry Scheme treatment and operates a dedicated CIS return service rather than limiting its construction support to general tax advice.
Key Facts
Ideal for: Construction businesses, contractors and subcontractors
Core services: CIS returns, CIS tax support, construction accounting, VAT, payroll and bookkeeping
Specialization: Integrating CIS with wider contractor and construction accounting
Location: Covent Garden, London, and Brentford
Additional support: Self Assessment and contractor tax services
Pearl Chartered Accountants offers a dedicated CIS tax return service covering monthly CIS returns, subcontractor tax refunds and year-end Self Assessment submissions. The firm has several London-area offices and explicitly positions its CIS service for contractors and subcontractors working in construction.
CIS is provided alongside payroll, statutory accounts, VAT, personal tax and corporation tax services. That wider service range can suit limited companies or growing construction businesses that need their CIS reporting coordinated with general business accounting rather than treated as an isolated annual tax exercise.
Key Facts
Ideal for: Contractors, subcontractors and construction businesses
IBISS & CO works with construction contractors and subcontractors through its dedicated construction-sector accounting service. Its CIS support includes registration, returns, deductions and compliance assistance, while its Self Assessment service specifically covers CIS subcontractors and refund claims.
The firm has several London locations, including Tooting, Mayfair and Wimbledon. It may be relevant to construction professionals who need CIS support alongside Self Assessment, property tax, payroll, VAT or wider business accounting, particularly where construction and property activities overlap.
Key Facts
Ideal for: Construction contractors, subcontractors and property-related businesses
Norton Bridges & Co focuses heavily on Construction Industry Scheme work and operates from Stanmore, London. Unlike broader accountancy firms where CIS represents one part of a much larger service portfolio, CIS accounting is a central part of this firm’s positioning.
Its services cover Self Assessment tax returns, CIS refund claims, contractor registration and setup, subcontractor verification, monthly CIS returns, payroll, bookkeeping and gross payment status applications. This makes the practice particularly relevant to individual subcontractors and smaller construction businesses seeking a provider with a strong CIS-specific focus.
Key Facts
Ideal for: CIS subcontractors and smaller construction contractors
Birchtree Sullivan provides CIS accounting through its London accountancy practice. Its dedicated CIS service covers contractors and subcontractors, with support around tax returns and the scheme’s reporting and deduction requirements.
The firm also handles company accounts, bookkeeping, payroll, VAT, tax planning and contractor-related tax matters. With offices across several parts of Greater London, it may suit businesses looking for local access as well as companies that need CIS combined with routine accounting and payroll administration.
Key Facts
Ideal for: Contractors, subcontractors and Greater London businesses
Core services: CIS accounting, tax returns, payroll, bookkeeping and VAT
Specialization: CIS support within a broader accountancy practice
Location: East London with additional Greater London offices
Additional support: Tax planning, contractor accounting and HMRC dispute support
TAJ Accountants provides dedicated CIS accounting services from East London. Its published CIS offering includes support with contractor obligations, CIS returns, deductions, tax consultancy and setup of systems used to manage Construction Industry Scheme reporting.
The firm also offers payroll, bookkeeping, Self Assessment and wider tax services. This combination can be useful for small construction companies that employ staff as well as use subcontractors and therefore need PAYE, CIS and business accounting handled together.
Key Facts
Ideal for: CIS contractors, subcontractors and small construction companies
BNA Consulting is a Paddington-based accountancy firm with a dedicated CIS accounting service. Published CIS services include online subcontractor verification and electronic filing of contractor returns.
The practice also provides payroll, bookkeeping, VAT, Self Assessment and limited company accounting. Its English and Russian-speaking team may be useful for construction business owners who prefer bilingual accounting support while keeping CIS administration and general business accounting with the same London provider.
Key Facts
Ideal for: Contractors requiring CIS administration and bilingual accounting support
Address: Paddington Central, 1 Kingdom St, London W2 6BD
Accotax
Accotax provides CIS tax return and refund services aimed particularly at construction subcontractors. Its CIS accountants help reconcile deductions and prepare the tax information needed to establish whether too much tax has been withheld through the scheme.
The firm’s wider offering includes company accounts, tax returns, payroll, bookkeeping and tax consultancy. Accotax operates from several locations in and around London, including a Chelsea appointment office, making it another option for construction professionals who want CIS support within a broader chartered accountancy service.
Key Facts
Ideal for: CIS subcontractors and construction professionals
Core services: CIS tax returns, refund support, general tax, payroll and bookkeeping
Specialization: CIS refund and subcontractor tax support
Location: London and Greater London locations
Additional support: Company accounts and tax consultancy
I Sumar & Co offers CIS and construction accounting services from Covent Garden. The firm’s published CIS work includes maintaining contractor information, updating CIS tax rates, producing electronic payment information and submitting CIS returns to HMRC.
Its construction-sector service also covers VAT domestic reverse charge issues and wider accounting requirements. This makes the firm relevant to contractor businesses that want payroll-style CIS administration combined with accounting, VAT and other compliance work.
Key Facts
Ideal for: Contractors with recurring CIS reporting requirements
Perrys Accountants treats construction and CIS accounting as a specialist sector within its wider practice. Its services for construction businesses include CIS compliance, bookkeeping, PAYE, financial statements and VAT returns.
The firm has a central London head office on the Strand as well as offices in Kent. Its broader tax and accounting capabilities may make it more relevant to established construction companies that need CIS incorporated into annual accounts, payroll and company tax work rather than subcontractor refund support alone.
Key Facts
Ideal for: Construction companies requiring wider accounting alongside CIS
Core services: CIS compliance, bookkeeping, PAYE, accounts and VAT
Specialization: Construction-sector accounting
Location: Central London and Kent
Additional support: Tax planning, payroll and statutory accounts
Taxfile provides CIS tax return, refund and accounting support for construction workers from South London. It works with both subcontractors and contractors and publishes specific services covering CIS tax refunds, monthly contractor returns and subcontractor tax matters.
The firm also assists with expense calculations, tax returns and general accounting. Its London presence includes Tulse Hill and other South London locations, making it particularly relevant to sole traders and individual construction workers who prefer a local practice with substantial emphasis on CIS-related personal tax work.
Key Facts
Ideal for: Self-employed construction workers, contractors and subcontractors
Address: 25 Thurlow Park Road, Tulse Hill, London SE21 8JP
Facebook: www.facebook.com/Taxfile
Twitter: x.com/TaxfileLondon
S&B Accountants
S&B Accountants provides dedicated CIS accounting for contractors and subcontractors in London. Its construction-sector service includes CIS registration and advice, ongoing compliance and assistance with the monthly obligations faced by contractors.
The practice also focuses on identifying expenses relevant to CIS subcontractors and helping clients meet HMRC filing requirements. Its positioning is specifically geared toward construction businesses rather than treating CIS only as a generic payroll or tax-return service.
Key Facts
Ideal for: London construction contractors and subcontractors
Core services: CIS registration, monthly compliance and contractor/subcontractor accounting
Specialization: Construction Industry Scheme accounting
Location: London
Additional support: Tax and expense-related CIS assistance
Address: 129 Mile End Rd, Bethnal Green, London E1 4GB
Facebook: www.facebook.com/sandbaccountants.uk
Conclusion
CIS tax services in London vary from specialist practices focused heavily on subcontractor returns and refunds to broader accountancy firms that manage CIS together with payroll, VAT, bookkeeping and company accounts. Contractors with regular subcontractor payments may place greater weight on verification, monthly returns and deduction administration, while subcontractors may need stronger Self Assessment, expense and refund support.
There is no single provider that fits every construction business. The appropriate choice depends on whether the requirement is a one-off CIS tax return, ongoing contractor compliance, construction payroll, wider company accounting or a combination of these services.
AC
Written by the Acumon team
Acumon is an ICAEW-registered firm of chartered accountants and registered auditors
based in London, with offices in Pitstone, Aylesbury and Bournemouth. Need advice on
anything covered here? Talk to us.
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