3.1 Business Accounting Principles & Financial Statements

Every C-20 license candidate needs a working knowledge of basic accounting — not to become a bookkeeper, but to read financial statements, spot a job that's losing money, and avoid the cash-flow mistakes that put more contracting businesses out of business than any lack of technical skill. The Business Finances domain of the Law & Business exam tests this foundational knowledge.

Cash-Basis vs. Accrual-Basis Accounting

There are two primary methods for recording income and expenses:

Cash-basis accounting records a transaction when cash actually changes hands. A contractor who receives a $4,000 progress payment on June 15 records $4,000 of income on June 15, regardless of when the work was actually performed. Cash-basis accounting is simple to maintain and gives an accurate picture of how much cash is on hand, but it can distort profitability — a contractor could show a large cash-basis "profit" in a month when old invoices were collected but little new work was performed, or a cash-basis "loss" in a month spent buying materials for a job that won't be billed until next month.

Accrual-basis accounting records income when it is earned (typically when the work is performed or the invoice is issued) and expenses when they are incurred, regardless of when cash actually moves. Accrual accounting gives a more accurate picture of a job's true profitability during the period the work happened, but it requires tracking receivables (money owed to the contractor) and payables (money the contractor owes) separately from the bank balance.

For federal tax purposes, most small and mid-sized C-20 contractors can choose either method. Under Internal Revenue Code (IRC) Section 448 and the related small-business exception referenced in IRC Section 460, a construction business with average annual gross receipts at or below approximately $32 million (the inflation-adjusted threshold for tax year 2026, per Revenue Procedure 2025-32) is generally exempt from the mandatory accrual/percentage-of-completion rules that otherwise apply to larger contractors and to long-term contracts expected to take more than two years. Virtually all C-20 licensees fall well under this threshold and may choose cash, accrual, or (for qualifying long-term jobs) the completed-contract method for tax reporting — even though many still keep books on an accrual basis internally for management purposes and to satisfy a bonding company's underwriting requirements. A contractor's internal bookkeeping method does not have to match the method its CPA uses to file taxes.

The Three Core Financial Statements

1. The Balance Sheet (Statement of Financial Position)

The balance sheet is a snapshot of what a business owns and owes on a specific date. It always balances according to the fundamental accounting equation:

Assets = Liabilities + Owner's Equity

2. The Income Statement (Profit and Loss Statement, or P&L)

The income statement measures profitability over a period of time — a month, quarter, or year — rather than at a single moment. Its basic structure:

• Revenue (total sales and billings)
• minus Cost of Goods Sold (COGS) — direct job costs: materials, direct labor, subcontractors, equipment tied directly to jobs
• = Gross Profit
• minus Operating Expenses (overhead: office rent, admin salaries, insurance, marketing, and vehicle costs not tied to a specific job)
• = Net Operating Income
• plus or minus other income and expenses (interest income, interest expense, gain or loss on asset sales)
• = Net Income

Gross profit margin (gross profit divided by revenue) is one of the most closely watched numbers in the trades; HVAC contractors commonly target a gross margin somewhere in the 35%-50% range on installation work, though the figure varies widely by market and business model, and no single "correct" number is tested on the exam — understanding the calculation matters more than memorizing a target percentage.

3. The Cash Flow Statement

The cash flow statement tracks the actual movement of cash in and out of the business, organized into three categories:

• Operating activities — cash from normal business operations (customer payments in, supplier and payroll payments out)
• Investing activities — cash used to buy, or proceeds from selling, long-term assets (a new service truck, tools, a warehouse)
• Financing activities — cash from loans, lines of credit, owner contributions or draws, or loan repayments

A contracting business can show a healthy net income on its income statement while still running out of cash — for example, if most of the profit is sitting in unpaid receivables or tied up in materials for jobs not yet billed. The cash flow statement is the tool that reveals this gap, which is why lenders, bonding companies, and experienced contractors watch it as closely as, or more closely than, the income statement.

Job Costing

Job costing is the practice of tracking all costs — direct materials, direct labor, subcontractor charges, equipment costs, and an allocated share of overhead — against a specific job, then comparing the actual cost to the original estimate. Job costing answers the question every contractor needs answered constantly: is this job actually making money?

A typical HVAC job cost breakdown separates:

• Direct costs: equipment (furnace, condenser, air handler), ductwork and fittings, refrigerant, direct labor hours on that job, permit fees, subcontracted electrical or crane work
• Indirect costs (overhead): office rent, insurance, administrative wages, vehicle depreciation, and other costs not traceable to one job, allocated across jobs using a rate — commonly a percentage of direct labor cost or total direct job cost

Without job costing, a contractor might discover only at year-end — via the income statement — that the business as a whole made money, without ever learning which specific jobs were profitable and which quietly lost money. A related tool, the Work-in-Progress (WIP) schedule, tracks percentage-of-completion jobs by comparing billings to date against earned revenue to date, flagging "over-billed" jobs (billed more than the work performed, which can mask a coming cash shortfall once the job is finished) and "under-billed" jobs (more work performed than has been billed, effectively financing the customer's project with the contractor's own cash).