Construction Accountants
Specialist accountants for contractors, subcontractors, and construction businesses. We handle CIS compliance, VAT complexities, and industry-specific accounting.
Accounting for Construction
The construction industry has unique accounting and tax requirements that general accountants often struggle with. From the Construction Industry Scheme (CIS) to reverse charge VAT and contract accounting, getting it wrong can be costly. Our construction specialists work with main contractors, subcontractors, housebuilders, and specialist trades across London. We ensure your CIS returns are filed accurately, help you achieve gross payment status, and manage the complexities of construction industry VAT.
Why Construction Businesses Need Specialist Accountants
Construction is one of the most heavily regulated industries in the UK from a tax and compliance perspective. The Construction Industry Scheme (CIS) alone creates monthly filing obligations and deduction requirements that simply do not exist in other sectors. Add in the domestic VAT reverse charge for construction services, the constant scrutiny of employment status for workers, and the complexity of contract accounting with retention payments, and it becomes clear why construction businesses need accountants with genuine sector expertise.
A general accountant unfamiliar with construction will often make costly mistakes — failing to verify subcontractors correctly, applying incorrect CIS deduction rates, miscategorising labour-only vs labour-and-materials payments, or getting the VAT reverse charge wrong on invoices. Each of these errors can result in HMRC penalties, cash flow disruption, or overpayment of tax. Our specialist construction accountants handle CIS compliance for contractors ranging from sole traders to large building firms, and we understand the practical realities of running a construction business in London — from managing multiple sites and subcontractors to dealing with stage payments and retentions.
We work with main contractors, subcontractors, housebuilders, civil engineering firms, specialist trades (electricians, plumbers, plasterers), and construction management companies. Whether you need monthly CIS returns, help achieving gross payment status, or a full-service accounting solution covering payroll, VAT, and year-end accounts, our construction team has the expertise to keep your business compliant and tax-efficient.
Understanding CIS Deductions and Compliance
The Construction Industry Scheme requires contractors to deduct tax at source from payments to subcontractors for labour. The standard deduction rate is 20% for verified subcontractors, rising to 30% for unverified subcontractors. Subcontractors who hold gross payment status receive the full payment without deductions. As a contractor, you must verify every subcontractor with HMRC before making the first payment, file monthly CIS returns by the 19th of each month, and pass all deductions to HMRC.
Getting CIS wrong is one of the most common and expensive compliance failures in construction. Late filing penalties start at £100 per month and escalate to £300 or 5% of the CIS deductions due. Incorrect deductions — whether over-deducting or under-deducting — create problems for both you and your subcontractors. We manage the entire CIS process for our construction clients: verifying subcontractors, calculating deductions correctly, preparing and filing monthly returns, and maintaining the records HMRC expects to see. For a detailed overview of how CIS works, see our comprehensive CIS guide for contractors.
For subcontractors, CIS deductions are advance payments of your tax liability — not an additional tax. We ensure that all CIS deductions suffered are correctly offset against your tax bill, and where you have overpaid, we reclaim the difference. If you are a subcontractor looking to achieve gross payment status and eliminate deductions entirely, our CIS returns service includes eligibility assessment and application preparation. Qualifying for gross payment status requires meeting HMRC's turnover test (£30,000 or more for sole traders), a clean compliance record, and evidence of genuine UK construction activity.
VAT Reverse Charge for Construction Services
Since March 2021, the domestic VAT reverse charge has applied to most business-to-business supplies of construction services where both parties are registered for VAT and CIS. Under the reverse charge, the supplier does not charge VAT on their invoice. Instead, the customer accounts for the VAT through their own VAT return — both as output tax and input tax. The effect is that VAT does not physically change hands between the two businesses, reducing fraud opportunities but creating significant invoicing and accounting complexity.
The reverse charge applies to supplies that are reported under CIS, including most building, repair, and maintenance work. It does not apply to supplies to end users (the final customer in the chain who does not make onward construction supplies), supplies of materials only, or certain excluded services such as architecture, surveying, and professional consultancy. Determining whether the reverse charge applies to each invoice requires careful analysis of the supply, the customer's status, and the contractual chain.
For example, if your construction company invoices another CIS-registered contractor £10,000 plus VAT for groundwork, you would issue the invoice for £10,000 with no VAT added, noting that the reverse charge applies. The customer then self-accounts for the £2,000 VAT on their return. However, if the same work is performed for a homeowner or a business that is the end user, you charge VAT in the normal way. We ensure every invoice is raised correctly, your VAT returns reflect the reverse charge treatment accurately, and your cash flow planning accounts for the impact of not receiving VAT on reverse-charge supplies.
Employment Status in Construction: Getting It Right
Employment status is one of the most contentious issues in the construction industry. HMRC has long scrutinised the construction sector for workers who are treated as self-employed but whose working arrangements suggest they are actually employees. Getting this wrong can result in backdated PAYE and NIC demands, penalties, and interest — potentially running into tens of thousands of pounds for businesses that engage multiple workers.
The key tests for determining employment status include control (does the engager dictate how, when, and where the work is done?), substitution (can the worker send a replacement?), mutuality of obligation (is the engager obliged to offer work and the worker obliged to accept it?), and financial risk (does the worker bear the cost of putting right defective work?). In construction, many workers fall into a grey area — they may use their own tools and work on a labour-only basis, but they work exclusively for one contractor, follow the contractor's schedule, and cannot genuinely send a substitute.
For medium and large construction businesses, the off-payroll working rules (IR35) add another layer of complexity. Since April 2021, if your company meets two of the three size thresholds (turnover above £10.2 million, balance sheet above £5.1 million, or more than 50 employees), you are responsible for assessing the employment status of every contractor you engage through a personal service company. Our tax advisory team conducts thorough status assessments, reviews contracts and working practices, and helps you implement compliant engagement processes. For sole traders and smaller contractors, we advise on structuring genuine self-employment relationships and documenting the factors that support self-employed status.
How We Help
Our Services for Construction
Frequently Asked Questions
What is the Construction Industry Scheme?
How do I get gross payment status?
How does the VAT reverse charge work in construction?
What penalties apply for late CIS returns?
Can a subcontractor reclaim CIS deductions?
Do I need a construction accountant if I am a sole trader tradesman?
Related Services for Construction
Construction Accountants in London
Based at 124 City Road, London EC1V 2NX, we serve construction businesses across Central London, the City, Shoreditch, Islington, Camden, and all London boroughs. We also work with clients nationwide via our cloud-based systems.
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