Specialist Construction Accountants: CIS, VAT & Tax Planning

Main Contractors

Main contractors hold a distinct set of obligations under the Construction Industry Scheme: verifying subcontractors with HMRC before making any payment, deducting tax at the correct rate (20 per cent for CIS-registered subcontractors, 30 per cent for unregistered ones), issuing payment and deduction statements, and filing monthly CIS300 returns by the 19th of each month. From April 2026, nil returns are mandatory in every tax month unless an inactivity period has been pre-notified to HMRC; removing the previous ability to automatically appeal nil-return penalties.

We manage the complete CIS compliance burden for main contractors; verifying subcontractors, calculating deductions, preparing and submitting monthly CIS300 returns, issuing deduction statements, and managing any HMRC correspondence relating to CIS. We also advise on the supply chain fraud provisions that came into force from April 2026, which require contractors to demonstrate they knew, or could not reasonably have known, that subcontractors in their supply chain were failing to meet CIS obligations.

Subcontractors & Sole Trader Builders

Sole trader builders and self-employed subcontractors working under CIS have tax deducted at source before they receive payment. This deduction: 20 per cent for those registered under CIS, 30 per cent for those who are not, is an advance payment against their income tax and National Insurance liability for the year. The amount deducted must be correctly entered on the annual Self-assessment return, which for sole traders earning above £50,000 is being replaced from April 2026 with quarterly Making Tax Digital digital submissions.

As specialist accountants for construction contractors and self-employed builders, we manage the complete Self-assessment or MTD process for subcontractors: reporting gross income correctly, claiming all allowable business expenses, offsetting CIS deductions received against the tax bill, and ensuring subcontractors receive any repayment they are owed promptly after filing. We also manage CIS Gross Payment Status applications and renewals for subcontractors who prefer to receive payments without deduction.

Limited Company Construction Businesses

Construction businesses operating through a limited company face the full CIS compliance framework alongside standard corporate obligations; Corporation Tax, annual statutory accounts, director payroll, Companies House filings, and VAT. For limited company subcontractors, CIS deductions received from main contractors can be recovered through the company's PAYE scheme each month via an Employer Payment Summary (EPS), or through a formal repayment claim to HMRC after the year end.

We provide a complete limited company accounting service for construction businesses; book-keeping, payroll, monthly CIS credit recovery, quarterly VAT returns (including the domestic reverse charge), annual accounts, Corporation Tax, and the personal Self-assessment return for each director. One service, one relationship, everything covered.

Property Developers

Property developers occupy a distinct position at the intersection of construction and property investment. Development activities carry their own VAT treatment; new residential construction is generally zero-rated, while commercial development and certain conversion works carry different rates. Developers face SDLT on land acquisitions, Capital Gains Tax on disposal or extraction of profit, and the accounting challenge of correctly capitalising development costs and recognising revenue at the right point.

As property and construction accountants, we advise developers on VAT recovery on development costs, the correct SDLT treatment of site acquisitions, the tax-efficient structure for development activities (sole trader, partnership, limited company, or SPV), and the timing of disposals to manage CGT exposure. We also prepare development project accounts that accurately reflect the financial position of each project throughout its lifecycle.

Housebuilders & Residential Developers

Housebuilders benefit from specific VAT reliefs that the construction sector as a whole does not; new residential construction is zero-rated, which means housebuilders can recover VAT paid on materials and services without charging it on their sales. However, the rules around what qualifies as new construction, what constitutes a conversion, and how mixed-use or commercial-to-residential conversions are treated require specialist knowledge. Getting the VAT treatment wrong on a residential development can result in significant unexpected liabilities or the loss of reclaim entitlement.

We advise housebuilders on VAT recovery on construction costs, the correct treatment of conversions and renovations, the DIY housebuilder VAT reclaim scheme where applicable, and the preparation of the VAT returns that correctly reflect all zero-rated and standard-rated supplies on a development.

Construction Trades Businesses

Electricians, plumbers, carpenters, roofers, plasterers, and other construction trades businesses operate within the CIS framework as subcontractors and, where they pay other workers, as contractors too. Many run as sole traders but are considering limited company formation as their income grows. All face the CIS deduction, the reverse charge VAT complexity when working between registered businesses, and the MTD transition for sole traders from April 2026.

We provide a complete accounting service for construction trades businesses; from CIS registration and first Self-assessment return through to limited company formation, book-keeping, VAT registration and quarterly returns, payroll, and year-round tax planning as the business matures.

The VAT Domestic Reverse Charge: What It Is and Who It Applies To

The VAT domestic reverse charge for construction services applies to most business-to-business supplies of construction work between VAT-registered businesses that are both registered under CIS. Instead of the subcontractor charging VAT on their invoice to the main contractor, the main contractor accounts for both the output VAT (what would have been charged) and the input VAT (what they can reclaim) on their own VAT return. The subcontractor receives no VAT from the main contractor and includes the supply in Box 6 of their VAT return without adding any VAT to Box 1.

The practical consequences of the reverse charge are significant. Subcontractors no longer hold VAT between invoicing and the quarterly payment date; a cashflow buffer that many relied upon for material purchases. Main contractors account for the VAT directly, which means their VAT returns become more complex and the risk of error in applying the reverse charge correctly increases.

When the Reverse Charge Does NOT Apply

The reverse charge does not apply in several important situations, and misapplying it; either by applying it when it should not be used, or by not applying it when it should; creates compliance risk in both directions:

End users: Where the customer is an end user; meaning they are not going to make any further onward supply of construction services, the normal VAT rules apply. The supplier charges VAT in the usual way. End-user status must be confirmed in writing from the customer, and the supplier bears responsibility for establishing status before issuing the invoice.

Zero-rated supplies: New residential construction is generally zero-rated. The reverse charge does not apply to zero-rated supplies.

Supplies to non-VAT-registered customers: The reverse charge only applies between VAT-registered businesses both within CIS. If the customer is not VAT-registered, normal VAT rules apply.

Non-CIS supplies: The reverse charge only covers construction services that fall within CIS. Non-construction elements of a contract may be treated differently.

VAT Scheme Considerations for Construction Businesses

Many construction businesses use the VAT Flat Rate Scheme, which simplifies VAT accounting by applying a fixed percentage to gross turnover rather than tracking input and output VAT separately. However, the introduction of the domestic reverse charge has significantly reduced the attractiveness of the Flat Rate Scheme for most construction businesses; because reverse charge supplies are excluded from the flat rate calculation, meaning Flat Rate Scheme users in construction often find the standard VAT accounting method more beneficial. We review your VAT scheme each year and advise on which approach produces the best outcome for your business.

HMRC Enforcement in 2026

HMRC is now actively increasing the number of VAT compliance checks in the construction sector. Construction businesses that have incorrectly applied the reverse charge; either by charging VAT when they should not, or by failing to apply it when they should; are receiving assessments and penalty notices. The toughened enforcement reflects a shift away from HMRC's earlier, more lenient approach following the introduction of the rules in 2021. We review our construction clients' VAT position as part of every engagement and advise proactively where we identify risks.

Monthly CIS Returns & Full CIS Compliance Management

We manage every element of CIS compliance for main contractors: verifying subcontractors with HMRC before payment, calculating the correct deduction rate for each subcontractor, preparing and filing monthly CIS300 returns by the 19th of each month (including nil returns from April 2026), and issuing payment and deduction statements to each subcontractor. We advise on the supply chain due diligence requirements introduced in April 2026 and review your subcontractor relationships to identify any supply chain risk exposure under the new "knew or should have known" fraud provisions.

For subcontractors, we manage the recovery of CIS deductions received: offsetting them against your annual Self-assessment or Corporation Tax liability, recovering excess deductions through the PAYE scheme for limited company subcontractors, or submitting formal repayment claims to HMRC where the deductions exceed the tax liability. We also manage CIS Gross Payment Status applications, renewals, and the ongoing compliance that GPS requires.

Best for: All main contractors, all CIS-registered subcontractors (sole trader and limited company), and construction businesses managing both roles simultaneously.

Construction VAT Accountant: Reverse Charge, Registration & Returns

We provide a complete VAT service for construction businesses: advising on the correct application of the domestic reverse charge for every supply, reviewing your contracts to determine end-user status, preparing and submitting quarterly VAT returns that correctly reflect all CIS and non-CIS supplies, and managing any HMRC VAT compliance checks. We review your VAT scheme annually and advise on whether the Flat Rate Scheme or standard VAT accounting is more beneficial given your current supply mix.

For property developers, we advise on VAT recovery on development costs, the zero-rating of new residential construction, the treatment of conversions and refurbishments, and the option to tax commercial properties. For businesses approaching the £90,000 VAT registration threshold, we advise on timing of registration and the implications for your invoicing and cashflow.

Best for: All VAT-registered construction businesses, those approaching the VAT threshold, and property developers managing mixed VAT rate supplies across their projects.

Construction Bookkeeping Services: Project-Level Financial Clarity

Accurate, up-to-date financial records are the foundation of CIS compliance, VAT returns, payroll, and year-end accounts. Our construction bookkeeping service covers income and expenditure tracking across multiple projects, supplier invoice processing and payment reconciliation, CIS deduction recording for contractor and subcontractor positions, bank reconciliation, and the preparation of records that make your monthly CIS returns, quarterly VAT submissions, and annual accounts straightforward to prepare.

We work across Xero, QuickBooks, Sage, and FreeAgent, and we configure your accounting software to handle CIS codes and reverse charge VAT correctly from the outset; eliminating the risk of incorrect invoicing and VAT misreporting that arises when standard software templates are used without construction-specific configuration.

Best for: All construction businesses needing accurate, CIS-compliant bookkeeping throughout the year; whether sole traders, limited companies, or larger construction businesses managing multiple concurrent projects.

Payroll Services for Construction Companies

Construction businesses managing employed workers face payroll complexity that extends beyond the standard PAYE framework. Site-based employees working across multiple projects, subcontractors who move between self-employed and employed status, the distinction between CIS subcontractor payments and PAYE employment, and the correct application of the Construction Industry Scheme for labour-only subcontractors all create specific payroll challenges.

We provide a fully managed payroll service for construction businesses; processing weekly, fortnightly, or monthly payrolls, submitting Real Time Information (RTI) returns to HMRC, managing auto-enrolment pension obligations, producing payslips and year-end P60s, and advising on the correct employment status distinction between PAYE employees and CIS subcontractors. From April 2025, employer NIC increased to 15 per cent, and the secondary threshold dropped to £5,000; we ensure your payroll reflects the correct employer NIC calculation and that the Employment Allowance is claimed where eligible.

Best for: Construction businesses with employed site workers, those managing a mix of PAYE employees and CIS subcontractors, and businesses whose payroll complexity has grown beyond what standard payroll software handles reliably.

Tax Planning for Construction Companies - Year-Round Strategy

The construction industry offers specific tax planning opportunities that a specialist construction tax accountant identifies as a matter of course, but that a general accountant will typically overlook. These include the Annual Investment Allowance for capital expenditure on plant and equipment (currently £1 million per year), the correct treatment of plant and machinery in construction, R&D tax credits for construction businesses innovating in build methods or materials, the timing of capital expenditure to maximise relief, and the most tax-efficient structure for growing construction businesses.

We review your complete tax position at least annually: considering your business structure, retained profit strategy, salary and dividend planning for owner-directors, pension contributions through the company, and the overall tax efficiency of your business across income tax, Corporation Tax, VAT, and CIS. For construction businesses considering growth through acquisition, subcontracting arrangements, or property development activities alongside their construction operations, we advise on the tax implications of each before any decision is made.

Best for: Owner-managed construction businesses, growing contractors reviewing their business structure, and construction companies with significant capital expenditure programmes who want to ensure allowances are fully utilised.

MTD Preparation for Construction Sole Traders & Subcontractors

From April 2026, sole trader builders and self-employed subcontractors with gross income above £50,000 must move from annual Self-assessment to quarterly digital submissions under Making Tax Digital for Income Tax. The threshold reduces to £30,000 in April 2027. CIS deductions received must be correctly incorporated into the MTD reporting framework; the quarterly submissions report income and expenses, and the year-end declaration reconciles the tax position including CIS deductions received.

We assess whether you are in scope for MTD, configure the right HMRC-compatible software for your construction business, set up your digital records correctly from the outset (including CIS income and deduction tracking), and manage your quarterly submissions and year-end declaration on your behalf; ensuring full MTD compliance before the first deadline and without disrupting your construction schedule.

Best for: Sole trader builders and self-employed subcontractors with gross income above £50,000, and those approaching that level who want to prepare for MTD well ahead of the April 2026 deadline.

Annual Accounts & Corporation Tax for Construction Companies

We prepare annual statutory accounts for limited company construction businesses: structured to reflect the project-based nature of construction income, correctly accounting for work-in-progress, retentions receivable and payable, and CIS positions. We calculate the Corporation Tax liability with full review of all available capital allowances and reliefs, and file the accounts with Companies House and HMRC on time. We also prepare the personal Self-assessment return for each director, bringing employment income, dividends, and any other personal income together into a single correctly prepared return.

Best for: All limited company construction businesses, from newly incorporated contractors through to established multi-project construction companies.

Construction Subcontractor Self-Assessment Including CIS Deduction Recovery

Sole trader subcontractors working under CIS must file an annual Self-assessment return reporting their gross income (the full invoice amount before CIS deductions), all allowable business expenses, and the total CIS deductions received during the year. The deductions are then offset against the income tax and Class 4 National Insurance liability calculated on the return. Where deductions received exceed the tax liability, a repayment is due from HMRC: which many subcontractors either do not claim or claim incorrectly.

We prepare the complete Self-assessment return for CIS subcontractors; correctly reporting gross income, identifying and applying all allowable business expenses (including materials, tool costs, van expenses, site clothing, professional fees, and home office costs where applicable), offsetting CIS deductions, and submitting the return on time. Where a repayment is due, we manage the repayment claim and follow up with HMRC to ensure it is received promptly.

Best for: All self-employed subcontractors operating under CIS; regardless of trade, income level, or whether they have previously filed Self-assessment returns without professional assistance.