Construction Accounting

Choosing an accountant for a construction business is not quite the same as choosing an accountant for a typical small company. Construction businesses can have CIS deductions going in both directions, subcontractor verification, Domestic Reverse Charge VAT, payroll, materials, retention payments, multiple live projects and margins that can change quickly when labour or material costs move. A general accountant may be perfectly capable of preparing annual accounts. The more important question is whether they understand how a construction business operates throughout the year. If you are trying to work out how to choose a construction accountant, these 12 questions will help you compare firms properly before handing over your bookkeeping, tax and financial records. What should you look for in a construction accountant? Look for an accountant who regularly works with construction businesses and can deal confidently with CIS, Domestic Reverse Charge VAT, subcontractors, payroll, construction bookkeeping and project-level cost reporting. Do not choose solely on the lowest monthly fee. Ask exactly what is included, how often your accounts will be reviewed, what reporting you will receive and whether the accountant can continue supporting you as your business grows. Why choosing the right construction accountant matters Construction accounting becomes complicated because several accounting processes can affect the same transaction. A subcontractor invoice, for example, may involve: If these processes are handled separately, mistakes can become difficult to identify. The right construction accountants should understand how these pieces connect rather than looking at each tax or bookkeeping issue in isolation. Here are the questions worth asking before appointing one. 1. Do you regularly work with construction businesses? Start with the most basic question. Ask how many construction businesses the accountant already works with and what types of businesses they support. There can be a significant difference between accounting for a local builder, a subcontractor working for several principal contractors, a growing construction limited company and a property developer running several projects. You want evidence that the accountant understands the commercial realities of construction, not simply that CIS appears somewhere on their website. Ask whether they regularly work with: A construction-focused accountant should already understand the terminology and common accounting problems you are describing. For example, if you run a building company, ask about their experience working with accountants for builders. If most of your income comes from contracting for other firms, experience with accountants for subcontractors may be more relevant. What you want to hear: specific examples of the types of construction businesses they support and the accounting processes they manage for them. 2. Can you manage both sides of CIS? This question quickly separates basic CIS knowledge from practical construction accounting experience. A construction business can be a contractor, a subcontractor or sometimes both. If you pay subcontractors, your accountant may need to help with: At the same time, your own customers may be deducting CIS from payments made to your company. Your accountant therefore needs to understand CIS deducted from subcontractors you pay and CIS suffered on income you receive. If they only discuss filing the monthly contractor return, ask what happens to CIS deductions made from your company’s own invoices. Good construction accounting should follow the entire CIS position. You can read more about how CIS returns work and how they fit into ongoing construction accounting. What you want to hear: a clear explanation of how they handle CIS as both contractor and subcontractor where relevant. 3. Do you understand CIS materials and deductions? CIS is not simply a case of deducting 20% from every invoice. The calculation can depend on how the invoice is structured and whether qualifying material costs have been incurred directly by the subcontractor. This matters because incorrect treatment of materials can lead to too much or too little CIS being deducted. Ask the accountant how they would review an invoice containing: They should be able to explain which parts may need to be excluded before the CIS deduction is calculated and why evidence supporting material costs matters. An accountant who regularly handles construction clients should also be comfortable identifying situations where material figures look inconsistent or have been recorded incorrectly. Our guide to CIS deductions explains the deduction rates, materials treatment and payment statements in more detail. What you want to hear: more than “CIS is normally 20%”. They should understand how the deduction itself is calculated. 4. Can you handle Domestic Reverse Charge VAT? VAT is another area where construction businesses need sector-specific knowledge. The Domestic Reverse Charge can apply to certain building and construction services where the required conditions are met. Instead of simply charging and collecting VAT in the normal way, the customer accounts for the VAT under the reverse charge. Whether the reverse charge applies can depend on factors including: Ask your prospective accountant what process they use for determining the VAT treatment of construction invoices. They should also understand how VAT interacts with your accounting software and bookkeeping rather than waiting until the VAT return is due to investigate transactions. What you want to hear: a practical process for reviewing invoices and VAT treatment, not simply confirmation that they have heard of the reverse charge. 5. How do you manage construction bookkeeping? Good construction bookkeeping should tell you more than your bank balance. A construction business may have labour, materials, subcontractors, equipment, professional fees and other costs spread across several projects at the same time. If everything is entered into broad accounting categories without proper structure, your year-end accounts might still be completed, but you may have very little idea which projects actually made money. Ask how the accountant would structure your bookkeeping. Questions worth asking include: Our construction bookkeeping service is designed around the financial workflow of construction businesses rather than treating bookkeeping purely as data entry. What you want to hear: bookkeeping processes that support project visibility and tax compliance throughout the year. 6. Can you track costs by project? This may be one of the most valuable questions on the list. Knowing that your

Choosing accounting software for a construction business is not quite the same as choosing software for a normal small company. A builder can have £100,000 moving through the bank and still have very little idea which job actually made money. A contractor may need to verify subcontractors, deduct CIS, issue payment and deduction statements and submit monthly returns. Add Domestic Reverse Charge VAT, payroll, materials, plant hire and several live projects, and ordinary bookkeeping software can quickly be pushed beyond basic invoicing and bank reconciliation. So when we looked at the best construction accounting software in the UK, we did not simply compare dashboards, mobile apps or how attractive the invoice templates look. We looked at the accounting problems we would actually expect a construction business to manage: That produces a rather different shortlist. Quick verdict: which construction accounting software is best in 2026? For most small and growing UK construction businesses, Xero is our best overall choice. It gives you strong day-to-day bookkeeping, VAT, CIS functionality and a large accountant ecosystem, with project costing available when you need more visibility by job. QuickBooks Online is a very close alternative, particularly for builders and smaller contractors who want CIS calculations and direct CIS submissions without having to build a complicated system around them. FreeAgent makes the most sense for many smaller CIS subcontractors, particularly where the business needs straightforward invoicing, expenses, CIS deductions and basic project profitability rather than sophisticated contractor accounting. For larger contractors, groups and developers, Sage becomes much more interesting, particularly Sage Intacct Construction. Its construction offering goes significantly further into committed costs, project accounting, WIP and multi-entity reporting. Our 2026 picks Requirement Our pick Why Best overall Xero Strong combination of CIS, VAT, bookkeeping, accountant access and project tracking Best for small builders QuickBooks Online Straightforward CIS, VAT, expenses and project profitability Best for CIS subcontractors FreeAgent Simple CIS invoicing and deduction tracking for smaller businesses Best for larger contractors Sage Intacct Construction Stronger WIP, committed costs, project reporting and multi-entity accounting Best for advanced job costing Construction-specific software Better control of retentions, valuations, cost codes, committed costs and contract reporting There is an important caveat. The “best” software depends heavily on whether you are a self-employed subcontractor turning over £80,000, a building company with six employees and ten subcontractors, or a contractor running several multi-million-pound projects at once. Those businesses should not be using the same accounting setup. Xero vs QuickBooks vs Sage vs FreeAgent for construction Here is how we would compare the main options from a construction accounting perspective rather than a generic small-business perspective. Comparison based on UK functionality available in September 2026. Software features and plan structures can change. Feature Xero QuickBooks Sage FreeAgent Construction-specific systems CIS support Very good Very good Very good Good, especially for subcontractors Usually very good Direct contractor CIS filing Yes, with contractor CIS functionality Yes Available No, CIS300 filed externally Depends on system Domestic Reverse Charge VAT Yes Yes Yes Yes, but some scenarios need more care Usually supported/integrated Job costing Good Good Basic to excellent depending on Sage product Basic Excellent Subcontractor records Good Good Good Good Usually excellent Payroll Available Available Available Available Often integrated MTD Yes Yes Yes Yes Usually through accounting integration Project profitability Good Good Strong in higher-level products Basic to good Strong Committed costs/WIP Limited compared with construction ERP Limited compared with construction ERP Strong with Intacct Construction Limited Usually strong Retentions/valuations Usually needs another process or app Usually needs another process or app Better through construction products/integrations Limited Usually strong Bank reconciliation Excellent Very good Very good Very good Depends on accounting integration Accountant access Excellent Excellent Excellent Excellent Depends on setup Ease of use Very good Very good Moderate Very good More training normally required Best fit Small/growing construction SMEs Builders and smaller contractors Growing and larger contractors Sole traders and small subcontractors Complex contractors The first four platforms can all work perfectly well in the right business. The mistake is expecting general accounting software to behave like a full construction ERP system. What construction companies actually need from accounting software Construction bookkeeping becomes complicated because several accounting systems effectively overlap. You may have ordinary supplier bills and customer invoices, but you can also have CIS deductions, VAT reverse charge transactions, subcontractor statements, labour costs, materials attributable to different jobs and payments arriving at different stages of a contract. For contractors, CIS adds another recurring compliance process. HMRC requires contractors to report payments made to subcontractors through monthly CIS returns. A significant 2026 change is that from 6 April 2026, the requirement for mainstream contractors to submit nil returns was reinstated where no subcontractor payments have been made, unless an appropriate inactivity notification is made. That makes reliable CIS records inside the accounting process even more important. CIS needs to connect with the bookkeeping Good CIS accounting software should make it easy to distinguish labour from qualifying materials, use the appropriate deduction rate and keep the subcontractor payment records consistent with the monthly return. The usual deduction rates include 20% for registered subcontractors, 30% where the higher rate applies and 0% where HMRC confirms gross payment status. If you want to understand the underlying calculation rather than relying entirely on the software, read our guide to CIS deductions. Contractors filing every month can also see our guide to CIS returns. Domestic Reverse Charge VAT cannot be ignored VAT is another reason we would not choose construction accounting software solely on price. HMRC’s Domestic Reverse Charge can apply to standard and reduced-rated construction services where the relevant conditions are met, including supplies reported within CIS between qualifying VAT-registered businesses. It changes who accounts for the VAT and how the transaction appears on the VAT return. Your accounting software therefore needs to support the correct VAT treatment without somebody manually “fixing” every VAT return at quarter end. Job costing is where useful construction accounts begin Compliance is only half the job. Imagine a builder invoices a client £60,000.