Construction Accounting 101: A Solid Guide for Contractors

Key Takeaways

  • Accrual accounting gives you a clearer picture of your business’s financial health by matching income and expenses when they’re earned or incurred—not just when cash changes hands—making it far more useful than cash-basis accounting.
  • A solid financial structure—with clear departments and a well-built chart of accounts—sets the stage for accurate, detailed reporting.
  • Separating fixed and variable overhead helps you pinpoint your breakeven point and make smarter calls on pricing, staffing, and capacity.
  • Your budget isn’t just numbers—it’s a roadmap for setting goals, allocating resources, and tracking performance all year long.
  • The right tools and training aren’t optional; use trade-specific software and ensure your team knows it well to get real value from your reports and dashboards.

The Importance of Good Accounting

Construction accounting is the basis of a contractor’s business decisions. While you may not be an accountant, or even like accounting, you are likely a decision-maker. You are asked to make numerous business decisions every week, and your decisions need to be correct the vast majority of the time.

Will we need to borrow money soon? How much cash should we have on reserve? Does each technician produce a profit? How many gross profit dollars do you need per day? Should we buy or lease? How much should we charge? These questions and others are much easier to answer with great financial reporting.

The accuracy and completeness of your financial reports depend heavily on your company’s financial structure.

Cash Versus Accrual Accounting

On an accrual basis, income (sales) is recognized at the time the product or service is sold. Expenses are recognized when the inventory is used. This method is GAAP compliant and is a necessity to properly manage your business.

With a cash basis, income is recognized when you receive the money. Expenses are recognized at the time the money is actually paid (and cleared the bank). This method is not GAAP compliant and is not useful for business management purposes. Do not use cash-based accounting to manage your business.

Do not let the subject of income taxes confuse you. That is a different subject entirely. That decision is related to tax management, not business management.

Cash and accrual accounting each offer their own distinct advantages and are suited to different business needs and decision-making styles. Learn more about their differences and use cases.

Divisions and Departments

We recommend creating a set of divisions such as HVACPlumbing, and Electrical. These should be separated as Residential and Commercial. Create a set of departments within each division. Examples of departments might include Demand Service, Replacement and Addon, IAQ and Accessories, New Construction, Design and Spec, Remodel, and others. All financial transactions must include a department.

Chart of Accounts

Financial transactions are recorded with a set of codes called the chart of accounts. These codes are classified by assets, liabilities, equity, income, cost of goods, overhead, and more. The chart of accounts is the foundation of your financial reporting system. It should be detailed and very well thought out.

💡 Pro Tip: Regularly Update Your Chart of Accounts
As your business grows, make sure your chart of accounts evolves with it. Regularly review and adjust your accounts to reflect new services, departments, or activities. Keeping your chart of accounts updated ensures that your financial reporting remains accurate and aligned with your business structure. This will help prevent misclassifications and improve clarity within your financial statements.

Fixed and Variable Overhead

It is very important to separate your overhead into fixed and variable types (to learn more about overhead types, check out: CFI on Overheads).

Fixed overhead remains essentially unchanged within a certain range of income. Examples include salaries, liability insurance, and rent. I like to refer to variable overhead as “somewhat variable overhead” because it varies slightly with changes in income. Examples include gasoline, small tools, office supplies, and legal fees.

To help clarify these categories, the following quick-reference guide lays out and breaks down these overhead types and how to treat them in your accounting.

Fixed vs. Variable: Quick Reference Guide

Cost TypeExample ExpensesTypical BehaviorAccounting Tip
Fixed OverheadRent, office salaries, liability insurance, software licensesRemains steady regardless of project volumeAllocate evenly across months in budget and breakeven calculations
Variable OverheadFuel, small tools, permits, cell phone usageFluctuates with number of jobs or technician activityTrack monthly and compare to gross profit for contribution margin analysis
“Somewhat Variable”Legal fees, office supplies, trainingChanges slightly with business activityMonitor trends—can grow disproportionately during expansion or busy seasons
Misclassified ItemsSubcontractor payments, job-site laborOften mistakenly included in overhead instead of COGSDouble-check categorization—these usually belong in cost of goods sold (COGS)

General Ledger

The general ledger is a master accounting document that provides a complete record of all the financial transactions in a business.

💡 Pro Tip: Use Key Financial Ratios to Monitor Financial Health
Get on top of your financial ratios—like the current ratio, quick ratio, and debt-to-equity ratio—are powerful tools for assessing the overall health of your business. These ratios give you a quick snapshot of your company’s liquidity and solvency, helping you identify potential risks early. Don’t just rely on profit margins; regularly check these ratios to ensure you’re maintaining a strong, sustainable financial foundation.

Thick versus Thin GL

This is a standard accounting term used to describe how much detail your GL contains. A thick GL contains a robust chart of accounts. Additional information will be added to each transaction. This includes marketing, product categories, departments, employee names, labor minutes sold, labor minutes paid, fixed assets, warehouses, warranty, callback, service agreements, and more.

Budgeting

A budget is an essential piece of your company’s financial structure. It is a projected income statement and establishes your company’s financial goals. A budget may also include a balance sheet, statement of cash flows, and other reports. A budget is an action plan that helps you allocate resources, evaluate performances, and formulate plans.

The basic process of creating a budget starts by listing your business’s fixed and variable costs on a monthly basis. Your next step is to predict what your monthly income will likely be. Finally, decide on the allocation of funds to achieve your goals.

Putting this Information to Work

Extensive financial and business information is used to create highly detailed reports, performance dashboards, and key performance indicators. Now you are ready to make better, more informed business decisions.

💡 Pro Tip: Implement Job Costing to Track Project Profitability
Job costing is essential for accurately tracking the costs associated with projects (labor, materials, subcontractor expenses, etc.). By breaking down costs on a per-project basis, you gain a clearer view of which projects are generating profit and where you’re losing money. Comparing your actual costs to your budget estimates helps identify areas where you can improve efficiency, adjust pricing or better allocate resources.

Departmentalized Income Statements

You will have the ability to produce income statements by the department, right down to net profit. You will be one of a very small group of contractors that have divided their financials into important segments and knows exactly how much net profit (or loss) is generated from each one.

The Power of Breakeven

(Income – Cost of Goods Sold) = Gross Profit

(Gross Profit – Variable Overhead) = Contribution Margin

(Contribution Margin – Fixed Overhead) = Net Profit Before Taxes

When contribution margin dollars cover your fixed overhead, you are at your breakeven point. Every single contribution margin dollar becomes net profit.

Imagine the power of knowing the exact day of each month when your company breaks even. Based on the facts, you can offer discounts to fill unused capacity or turn down low-profit work in favor of something more beneficial. You can offer performance bonuses with confidence.

Performance Dashboards

A detailed set of dashboards offers a deep look into every finite detail of your business. There will be complete transparency regarding technician production, department profitability, sales lead production by an employee, marketing success, customer experience, health and safety, HR, and so much more.

Specialized Accounting Software

If you want the things mentioned in this article, but do not know where to begin, invest in great software and use it properly.

Do not let your employees or an outside accountant tell you what software to use. If your accountant suggests generic store-bought software, get a better accountant. They are more concerned with themselves than they are your business.

You need specialized contracting business management software that puts a strong emphasis on accounting and financial structure. Do not be fooled by bells and whistles or the promise of “this software is super easy to use”. The only way to make software easy to use is to cut out important features and remove options.

You likely invest significantly in training for your technicians. The same should be true for people that use your financial software. If you have great software, it is vital to use that software to its fullest extent and the way the designer intended it to be used.

FAQs

1. What should I do if I’ve been using cash-basis accounting but want to switch to accrual?

Start by working with a knowledgeable accountant or financial consultant to convert your records properly. You’ll need to adjust how revenue and expenses are recognized and likely restate prior periods. This shift will give you better visibility into performance trends. Make the transition at the start of a fiscal year, if possible, for cleaner reporting.

2. How often should I review my financial statements?

At minimum, review your income statement, balance sheet, and cash flow statement monthly. Frequent reviews help you spot issues early and adjust before small problems become major ones. Departmental reports and dashboards should be checked weekly or even daily, depending on your business size. Consistency is more important than complexity.

3. How can I train my team on using our accounting software effectively?

Invest in formal training directly from the software provider or a certified expert. Create internal documentation customized to your workflows for reference. Assign a point person or “super user” to support the rest of your team. Ongoing training is key—especially when features or reporting needs evolve.

4. Can I still outsource bookkeeping if I want detailed departmental reports?

Yes, but choose a bookkeeping partner familiar with your industry and departmental accounting. Ensure they understand how to track transactions with appropriate tags (e.g., division, department, technician). Clear communication and regular check-ins are essential. Avoid low-cost generic services that only provide basic financials.

5. What KPIs should I start tracking first if I’m new to performance dashboards?

Begin with a few high-impact metrics: gross profit by department, breakeven point, technician billable efficiency, and lead-to-sale conversion rate. These offer a clear view of operational health. As you grow comfortable, expand into customer experience and marketing ROI. Don’t overwhelm yourself—start simple and build over time.

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