Construction accounting guide for profitable projects

Published Monday 30 March 2026

Table of contents

• What is construction accounting?
• Why is construction accounting different?
• Key elements of construction accounting
• Construction accounting methods
• Job costing and tracking project expenses
• Beware of the cash flow trap
• Get the details right
• How to set up construction accounting for your business
• Make accounting part of your workflow
• Construction accounting best practices
• Simplify construction accounting with Xero
• FAQs on construction accounting

Key takeaways

• Implement job costing from day one by creating unique job codes for each project in your accounting software and tracking all costs separately, including labour, materials, subcontractors, equipment, and overhead allocation.
• Protect your business from cash flow problems by invoicing regularly at milestones, requesting deposits for major material purchases, and stopping work when clients miss payments since accounts receivable typically take over 60 days while payables are due in under 30.
• Choose the right accounting method for your business size and project types, whether cash basis for smaller contractors, accrual basis for accurate profitability, or percentage of completion method for long-term contracts.
• Update your accounting records weekly by recording expenses on-site using mobile software, sending invoices promptly after completing milestones, and reviewing job costs regularly to catch budget overruns before they become major losses.

What is construction accounting?

Construction accounting is a specialised method of tracking finances for construction businesses. Dedicated standards like IFRS 15 Revenue from Contracts with Customers (which replaced IAS 11 Construction Contracts) have existed since the early 1990s. It focuses on managing costs, revenue, and cash flow on a project-by-project basis rather than across the business as a whole.

Unlike standard accounting, construction accounting must handle:

• Long project timelines: Jobs can span months or years, requiring careful revenue recognition
• Variable costs: Material prices, labour rates, and subcontractor fees change frequently
• Multiple active projects: You need to track profitability for each job separately
• Complex payment structures: Progress billing, retainage, and milestone payments are common

Construction accounting helps you understand which projects make money, where costs are running over budget, and how to maintain healthy cash flow across all your jobs.

Why is construction accounting different?

Construction accounting differs from standard accounting because you operate on a project-by-project basis with a mobile, decentralised workforce. Standard accounting methods don't account for these unique challenges.

Project-based work structure

You rarely have a fixed structure. Site managers typically don't employ the workers on a project directly. Instead, most of your workforce consists of contractors and subcontractors.

This creates accounting challenges:

• Multiple simultaneous projects: Contractors often work on several jobs at once, splitting time between sites
• Subcontractor coordination: Contractors may hire their own subcontractors, adding layers to track
• Fluctuating payroll: Temporary workers come and go, so your payroll may change weekly

Decentralised and mobile operations

Unlike office-based businesses, your construction work happens across multiple job sites. This affects how you track expenses and manage finances.

Your operations differ from office-based businesses in several ways:

• No central location: Costs occur at different sites, making expense tracking harder
• Field-based decisions: Purchases and changes happen on-site, often without immediate documentation
• Mobile workforce: Workers move between locations, complicating time tracking and payroll

Key elements of construction accounting

Construction accounting involves several core components that differ from standard business accounting. Understanding these elements helps you set up systems that accurately track your project finances.

Key elements to manage:

• Job costing: Track all costs for each project separately, including labour, materials, equipment, and subcontractors
• Revenue recognition: Record income at the right time based on project completion or milestones, following global standards like IFRS 15 Revenue from Contracts with Customers, which became mandatory in 2018
• Work in progress (WIP): Monitor ongoing projects to understand current profitability before jobs are complete
• Retention tracking: Account for the percentage of payment clients hold back until project completion
• Change order management: Document and bill for scope changes that affect project costs
• Equipment depreciation: Allocate equipment costs across projects based on usage

Each element requires specific tracking methods. Your accounting system should let you view these metrics by individual project and across your entire business.

Construction accounting methods

Construction businesses typically use one of four accounting methods: cash basis, accrual basis, completed contract method (CCM), or percentage of completion method (PCM). The right choice depends on your project size, contract type, and tax situation.

Each method works differently:

• Cash basis: Record income when you receive payment and expenses when you pay them. Best for smaller contractors with straightforward projects.
• Accrual basis: Record income when you earn it and expenses when you incur them, regardless of when cash changes hands. Provides a more accurate picture of profitability.
• Completed contract method (CCM): Recognise all revenue and expenses when a project finishes. Works well for short-term projects or when outcomes are uncertain.
• Percentage of completion method (PCM): Recognise revenue proportionally as work progresses. Required for long-term contracts and provides the most accurate ongoing profit picture.

Talk to your accountant about which method suits your business. Your choice affects tax timing, financial reporting, and how you understand project profitability.

Job costing and tracking project expenses

Job costing is the process of tracking all costs associated with a specific project. It lets you see whether each job is profitable and helps you bid more accurately on future work.

Effective job costing tracks these cost categories:

• Direct labour: Wages for workers on the project, including overtime and benefits
• Materials: All supplies purchased for the job, from concrete to fasteners
• Subcontractor costs: Payments to subcontractors for specialised work
• Equipment: Rental fees or allocated depreciation for machinery used on-site
• Overhead allocation: A portion of indirect costs like insurance, office expenses, and admin salaries

To track project expenses accurately:

1. Create a unique job code for each project in your accounting software
2. Assign all purchases, invoices, and time entries to the correct job code
3. Review job cost reports weekly to catch budget overruns early
4. Compare actual costs to your original estimate throughout the project
5. Analyse completed jobs to improve future bidding accuracy

Cloud-based accounting software makes job costing easier by letting you record expenses from the job site and view reports in real time.

Beware of the cash flow trap

The cash flow trap occurs when you pay for materials and labour before receiving payment from clients. This is a significant issue: accounts receivable on a typical job averages more than 60 days according to industry research, while payables are due in under 30.

Consider this scenario: a client hires you to build a warehouse. You pay for materials upfront from your business capital. Halfway through the project, the client goes bankrupt.

You're unlikely to recover more than a fraction of what you've spent. Without enough reserves, your business could fail too.

Many small construction firms close because of bad debts. Protect yourself with these cash flow practices:

• Invoice regularly: Bill clients at milestones or weekly rather than waiting until project completion
• Request deposits: Get payment upfront for major material purchases
• Match expenses to revenue: Avoid spending significantly more than you've collected
• Stop work when payments stop: If a client misses payments, pause the project until they pay
• Monitor cash flow weekly: Use your accounting software to track incoming and outgoing funds

Keeping your cash flow balanced protects your business from client payment problems.

Get the details right

Construction accounting regulations vary by location. Getting them wrong can lead to penalties, tax issues, or audit problems. Professional guides like the AICPA Construction Contractors Audit and Accounting Guide are constantly being updated on topics like audit evidence and risk assessment.

Pay attention to these key areas to stay compliant:

• Accounting method selection: Your choice of cash, accrual, CCM, or PCM affects tax timing and reporting requirements
• Revenue recognition rules: Long-term contracts may have specific rules about when you can recognise income
• Retention accounting: Track and report retention amounts correctly on your balance sheet
• Subcontractor compliance: Collect proper tax documentation and issue required forms
• Prevailing wage requirements: Government contracts often require specific wage rates and certified payroll

Your accountant can help you choose the right methods and stay compliant as regulations change. The cost of professional advice is usually far less than the cost of fixing mistakes.

How to set up construction accounting for your business

Setting up construction accounting properly from the start saves time and prevents costly mistakes later. Get your business structure and accounting systems in place before taking on work.

Follow these steps to get started:

1. Choose your business structure: Incorporate as a limited liability company, partnership, or sole proprietorship. Each structure offers different legal protections and tax implications. Talk to a lawyer or accountant about the best option for your situation.
2. Get appropriate insurance: Construction carries physical and legal risks. Obtain specialist insurance cover to protect against accidents, property damage, and liability claims.
3. Hire accounting support:Bookkeepers manage day-to-day accounts, processing expenses, bills, and invoices. Accountants advise on business structure and tax strategy. Consider hiring both, as they typically save more than they cost.
4. Set up job costing from day one: Create a system to track costs by project before you start your first job. Retrofitting job costing later is difficult and time-consuming.
5. Choose construction-friendly software: Select accounting software that supports job costing, progress invoicing, and mobile access from job sites.
6. Keep certifications current: Safety laws change frequently. Maintain required certifications through ongoing training. Your insurance coverage and ability to win contracts may depend on it.

Make accounting part of your workflow

Regular accounting prevents small issues from becoming expensive problems. Update your accounting software at least weekly with expenses, invoices, employee information, and cash flow data.

Construction moves fast. If you fall behind on your accounts, you'll struggle to catch up and may miss critical financial warning signs.

Build accounting into your daily routine:

• Record expenses on-site: Use mobile accounting software to log purchases and receipts as they happen
• Send invoices promptly: Bill clients immediately after completing milestones or deliverables
• Review job costs weekly: Check each project's profitability before small overruns become large losses
• Update employee records: Keep payroll information current as workers join and leave projects

Cloud-based accounting software makes this easier. Access your accounts from a smartphone or tablet on any job site. Send invoices, record material costs, and track expenses from wherever you're working.

Regular accounting helps you:

• Avoid undercharging: Capture all expenses so your invoices reflect true project costs
• Maximise tax benefits: Record deductible expenses when they occur
• Reduce audit risk: Maintain accurate, up-to-date records that support your tax filings

Construction accounting best practices

Construction accounting best practices help you avoid common mistakes and maintain accurate financial records. Follow these guidelines to keep your accounting on track.

1. Separate business and personal finances: Open dedicated business bank accounts and credit cards. Never mix personal and project expenses.
2. Document everything: Keep receipts, contracts, and change orders organised by project. Digital copies stored in the cloud are easier to access and harder to lose.
3. Reconcile accounts weekly: Match your bank statements to your accounting records every week. Catching discrepancies early prevents larger problems.
4. Review job profitability monthly: Analyse each active project's actual costs against estimates. Identify trends before they affect your bottom line.
5. Invoice promptly and follow up: Send invoices as soon as work is complete or milestones are reached. Follow up on overdue payments within days, not weeks.
6. Plan for seasonal fluctuations: Construction often slows during certain seasons. Build cash reserves during busy periods to cover slower months.
7. Back up your data: Use cloud-based software with automatic backups. Test your ability to restore data periodically.
8. Review with your accountant quarterly: Schedule regular check-ins to discuss cash flow, tax planning, and any concerns about your financial position.

Simplify construction accounting with Xero

Organised construction accounting helps you track project profitability, manage cash flow, and avoid costly mistakes.

Xero makes construction accounting easier with features built for project-based businesses:

• Job tracking: Assign costs and income to specific projects for accurate profitability reporting
• Mobile access: Record expenses and send invoices from any job site
• Bank reconciliation: Match transactions automatically to save time on bookkeeping
• Real-time reporting: See your cash position and project performance anytime

Take the time to set up your construction accounting properly. The effort pays off in better financial visibility, fewer surprises, and more confident decision-making.

Ready to simplify your construction accounting? Get one month free and see how Xero can help your business.

FAQs on construction accounting

Find answers to common questions about construction accounting below.

What type of accounting is used in construction?

Construction businesses typically use cash basis, accrual basis, completed contract method (CCM), or percentage of completion method (PCM). The best choice depends on your project length, contract size, and tax situation.

How difficult is construction accounting?

Construction accounting is more complex than standard small business accounting because it requires tracking costs and revenue by individual project. However, the right software and professional support make it manageable for most contractors.

How do I record construction expenses?

Record each expense to the specific project it relates to using job codes in your accounting software. Capture receipts on-site using mobile apps, and categorise costs by type: labour, materials, subcontractors, or equipment.

What's the difference between job costing and project accounting?

Job costing tracks the direct costs of a specific project, while project accounting includes job costing plus revenue recognition, billing, and profitability analysis. Project accounting gives you a complete financial picture of each job.

Do I need special software for construction accounting?

You don't need construction-specific software, but you do need accounting software that supports job costing and project tracking. Cloud-based platforms like Xero let you track costs by project and access your accounts from job sites.