Construction & CIS Accountants in London
Specialist accounting and tax support for contractors, subcontractors and growing construction businesses — covering CIS, Domestic Reverse Charge VAT, payroll, bookkeeping and project profitability.
What Affects Your Construction Profit?
Follow the Money Through the Project
Construction accounting becomes clearer when each part of the commercial process is connected. We look at the job, subcontractor payments, CIS, VAT, payroll and underlying project margin together rather than treating each filing in isolation.
Job / Contract
Understand the commercial activity and billing structure.
Subcontractor Payment
Identify payments that fall within CIS and supporting records.
CIS Deduction
Apply the correct treatment and reconcile contractor deductions.
VAT / Payroll
Coordinate Domestic Reverse Charge VAT and payroll obligations.
Project Margin
See whether the job is actually producing the expected return.
Accounting Built Around Construction Activity
Support across the financial and compliance areas that commonly interact in contractor and subcontractor businesses.
CIS & Subcontractor Compliance
Contractor and subcontractor support including deduction records, verification, monthly returns and reconciliation of CIS suffered.
Domestic Reverse Charge VAT
Review of VAT treatment on construction services, invoicing and bookkeeping where the Domestic Reverse Charge applies.
Construction Bookkeeping
Structured bookkeeping for labour, materials, subcontractors, plant, vehicles and project-related expenditure.
Payroll
Payroll support where construction businesses have employees, variable hours or project-based working arrangements.
Project & Job Costing
Better visibility over project revenue, direct costs, overheads, gross margin and cash requirements.
Year-End Accounts & Tax
Accounts, Corporation Tax and wider tax support aligned with the underlying records and construction activity.
The Accounting Issues Are Not Always the Same
Main Contractors
Contractors often need a joined-up process covering subcontractor verification, CIS deductions, monthly returns, reverse charge VAT and project-cost visibility.
- CIS subcontractor verification
- Monthly CIS return support
- Domestic Reverse Charge VAT
- Payroll and direct labour
- Project margin monitoring
Subcontractors
Subcontractors may need help reconciling CIS deductions against invoices, records and tax returns so that deductions suffered are properly reflected.
- CIS suffered reconciliation
- Sales invoice matching
- VAT and bookkeeping
- Self Assessment or company tax
- Cash-flow visibility
Do You Know What the Job Actually Made?
Turnover alone does not tell you whether a construction project is performing. Labour, subcontractors, materials, VAT and overheads can materially change the real margin.
Better records make it easier to identify where profit is being earned, where cash is being absorbed and which projects need closer attention.
From Revenue to Real Margin
Construction Businesses at Different Stages
Main Contractors
Businesses engaging subcontractors and managing CIS obligations.
Subcontractors
Individuals and companies suffering CIS deductions.
Small Construction Companies
Growing businesses needing stronger bookkeeping and compliance.
Trades With Employees
Construction businesses combining payroll and subcontractor costs.
Multi-Project Businesses
Businesses needing clearer project and margin visibility.
Practical Support Around the Whole Construction Process
Whole-Problem View
We look at the transaction, CIS, VAT, payroll and records together.
Principal-Led
Direct involvement from the person responsible for understanding and managing the engagement.
Early Issue Identification
Missing records, VAT issues and CIS inconsistencies are easier to manage when identified earlier.
Specialist Coordination
Appropriate independent specialist input can be coordinated where a matter needs deeper technical expertise.
Accounting Support Beyond CIS
Useful HMRC Guidance
Construction Industry Scheme
HMRC guidance covering contractor and subcontractor responsibilities.
View HMRC CIS guidance →Domestic Reverse Charge VAT
Government guidance on the VAT domestic reverse charge for construction services.
View reverse charge guidance →PAYE & Payroll
Government guidance on operating PAYE where workers are employees.
View PAYE guidance →Construction & CIS Accounting Questions
Who needs to register as a CIS contractor?
Businesses paying subcontractors for construction work may need to operate CIS depending on the nature and level of their construction activity.
Can subcontractors reclaim CIS deductions?
CIS deductions suffered may be set against the subcontractor’s tax liabilities depending on whether the business operates as a sole trader or limited company.
What is Domestic Reverse Charge VAT?
For certain construction services, the customer rather than the supplier accounts for the VAT. The correct treatment depends on the transaction and status of the parties.
Can ATA help reconcile CIS suffered?
Yes. We can help reconcile contractor deduction statements against invoices and accounting records so the position is clearer before tax filings are completed.
Do construction companies need project accounting?
It is not always mandatory, but project-level reporting can make it much easier to understand profitability, cash requirements and underperforming jobs.
Need Help With CIS, VAT or Construction Accounting?
Tell us how your construction business operates and where you need support. We can review the accounting, tax and compliance issues around the actual workflow.
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