Finances are not like running a typical firm when you’re a contractor. Income comes in chunks, expenses are linked to individual contracts and cash flow can vary substantially between projects. Good contractor accounting service includes recording every dollar you make and spend at the project level so you always know which jobs are profitable and which are eating away at your margins.
Why Project-Based Accounting Matters for Contractors
Most contractors work on many projects simultaneously. It's practically impossible to tell genuine profitability without breaking financials out by project. You may have thought the project was successful, only to find later that material overruns and subcontractor costs had discreetly eaten into your margin.
With project accounting, you have a comprehensive financial view of every engagement. Compare real prices with forecasts, identify budget blowouts early, and make smarter bidding decisions on future work. It also makes tax time a lot less difficult.
Step 1: Set Up a Chart of Accounts by Project
The foundation of solid contractor bookkeeping is a well-structured chart of accounts. Rather than lumping all income and expenses into generic categories, create project-specific accounts or cost codes from the start.
For each project, you should track:
- Contract revenue — the agreed project value and any variation orders
- Labour costs — your own time plus any hired workers or subcontractors
- Materials and supplies — broken down by phase or trade if relevant
- Equipment and plant hire — including depreciation on owned assets
- Overhead allocation — a proportional share of your general business costs
Accounting software such Xero or QuickBooks allows you to assign transactions directly to job codes, making it straightforward to pull a profit-and-loss report per project at any point.
Step 2: Track Project Expenses in Real Time
Waiting until the end of a project to reconcile expenses is one of the most common — and costly — mistakes contractors make. By then, receipts are lost, invoices are forgotten, and your project margin is fiction rather than fact.
Use a Consistent Expense Capture System
Set a rule: every expense gets recorded within 24 hours of being incurred. This can be as simple as photographing receipts with a mobile app that syncs to your accounting software. Apps like Dext or Hubdoc integrate directly with cloud accounting platforms and categorise expenses automatically.
Separate Business and Project Costs
Not every expense belongs to a specific project. Rent, insurance, and professional fees are overhead costs. When allocating these to projects, use a consistent method — such as allocating based on the proportion of total project revenue that each job represents for the period.
Step 3: Manage Progress Billing and Income Recognition
Project income is rarely received in one lump sum. Most contractors invoice in stages — upon contract signing, at project milestones, or on a percentage-completion basis. This creates a timing gap between when work is done and when cash hits your account.
Two terms you need to understand:
- Earned revenue — income that corresponds to work already completed
- Deferred revenue — payments received before the work is done
Recognising income accurately is both a financial management issue and a compliance requirement. In Singapore, the Accounting Standards Council's FRS 115 governs how revenue from contracts with customers is recognised — requiring contractors to match income to the performance obligations they have fulfilled.
Practical tip: maintain a simple project billing schedule for each job. List each milestone, the invoice amount, the due date, and the payment status. Review it weekly.
Step 4: Monitor Project Profitability With Regular Reporting
Knowing your numbers at project completion is useful. Knowing them mid-project is powerful.
Run a Cost-to-Complete Analysis
A cost-to-complete analysis compares what you have spent so far against what the project is likely to cost in total. It flags early whether a project is tracking over budget, giving you time to act — renegotiate a subcontractor rate, reduce material waste, or raise a variation claim before the project closes.
Use a Simple Project Profitability Table
Step 5: Handle GST Correctly Across Projects
If your business is GST-registered in Singapore, every project invoice must include GST at the current rate of 9%. The complication for contractors is timing — you may pay GST on materials and subcontractor invoices long before you invoice the client and recover it.
This input tax credit cycle can create short-term cash flow pressure. Tracking project expenses in real time helps you file accurate GST returns and ensures you claim back input tax promptly — rather than leaving money on the table because receipts were not captured.
Step 6: Maintain a Cash Flow Forecast Across All Active Projects
Individual project profitability matters, but your business survives on cash flow. You could have three profitable projects running and still face a cash crisis if multiple client payments are delayed simultaneously.
Build a rolling 12-week cash flow forecast that maps expected inflows (project invoices due) against expected outflows (supplier payments, payroll, tax). Update it weekly. This single habit gives you early warning of cash shortfalls and time to act — whether that means chasing an overdue invoice or arranging a short-term facility.
Common Contractor Accounting Mistakes to Avoid
- Mixing personal and business finances — always use a dedicated business bank account
- Underestimating overhead allocation — projects look more profitable than they are when overhead is ignored
- Failing to document variation orders — verbal agreements do not hold up; every scope change should be documented and invoiced
- Ignoring retention amounts — track retention separately so you know exactly what is still owed to you
- Delaying tax payments — set aside a percentage of each project payment for corporate income tax from day one
When to Bring in a Professional
As your organization grows, the difficulties associated with managing project costs and recognizing revenue multiply rapidly. If you are managing many projects at the same time, staffing, retention or GST on progress claims a specialist accountant can save you considerably more than their price.
TriServ provides customized contractor accounting services for contractors and consultants working in Singapore – from setting up the necessary systems, to ensuring compliance, to providing visibility of profitability throughout each project you operate.
Frequently Asked Questions
What is contractor accounting and how is it different from standard bookkeeping?
Contractor accounting is more than simply keeping track of revenues and expenses for the entire organization. It’s also had task costing, progress billing, retention monitoring and cost-to-complete analysis – things you don’t find in normal bookkeeping because they represent the project-based nature of contracting business.
How should I track project expenses as a contractor in Singapore?
Use cloud accounting software with job-code functionality to assign every spending to a project. Snap photos of receipts on the spot with a mobile app and balance costs by project on a weekly basis. This helps you to maintain your project accounting accurate and claim GST input tax timely.
How do I recognise income correctly on long-term contracts?
Under Singapore’s FRS 115, revenue is recognized when performance requirements are satisfied, generally based on the proportion of work completed. Do not put the whole value of the contract into income at once. Ensure your financials represent the exact condition of each project. Match income to level of completion.
What is the best way to manage cash flow across multiple projects?
Keep a rolling 12-week cash flow projection that matches project invoice due dates to expected payments. Check weekly. It helps you identify possible deficits early and follow outstanding invoices before a financial imbalance becomes a disaster.
Do I need a separate bank account for each project?
You don't need a different account for every project, but you need a company bank account distinct from your personal finances. Use your accounting software’s job-coding tool to digitally divide project money — the same clarity, without the extra maintenance of several accounts.
When should a contractor hire an accountant?
If you are managing more than two or three concurrent projects, employing staff, or struggling with GST on progress claims and retention, it is time to bring in a specialist. A contractor-focused accountant helps you set up the right systems, stay compliant, and protect your margins from the start.
