Bookkeeping for Contractors: What You Need to Know

Bookkeeping for Contractors: What You Need to Know

If you run an HVAC company, a plumbing business, an electrical contracting firm, or any other home service operation, your bookkeeping needs are different from a typical small business. You’re not selling widgets from a storefront. You’re running crews, buying materials for specific jobs, managing subcontractors, and juggling dozens of moving pieces every week.

And if your books aren’t set up to reflect how your business actually works, they’re not helping you. They’re just checking a box for your CPA at tax time.

Here’s what contractor bookkeeping should actually look like.

Your Chart of Accounts Should Match Your Business

Most contractors start with the default QuickBooks chart of accounts and never change it. The result is a P&L with 50 vague expense categories, half of which say “Miscellaneous” or “Other.” These make for useless financial statements that don’t provide any insights into how your business is performing.

A contractor’s chart of accounts should be clean and specific. Your cost of goods sold should break out materials, labor, and subcontractor costs. Your operating expenses should separate vehicle costs, insurance, tools and equipment, and office overhead. When it’s structured right, you can look at your P&L and immediately see where your money is going.

Job Costing Is the Difference Between Guessing and Knowing

Most bookkeepers will categorize your transactions and reconcile your accounts. That’s table stakes. What most won’t do is set up job-level tracking so you can see profitability per job.

Job costing means tying every dollar of revenue and every dollar of cost to a specific project. When a crew does an HVAC install, you should be able to see exactly what you invoiced, what the materials cost, what the labor cost, and what the subcontractors charged. The difference is your gross profit on that job.

Without this, you’re flying blind. You might know your total revenue and total expenses for the month, but you have no idea which jobs drove the profit and which ones quietly lost money. QuickBooks Online’s Projects feature handles this well for most contractors in the $500K–$3M range.

Separate Personal and Business — No Exceptions

This is the most common issue we see with contractor books. Personal groceries on the business card. The truck payment running through the company account even though it’s a personal vehicle. Random Amazon purchases that might be tools or might be birthday gifts.

Every time a personal expense runs through the business, it inflates your expenses, skews your profitability, creates extra work for your bookkeeper, and complicates your taxes. The fix is simple: separate accounts, separate cards, and an owner’s draw for personal spending.

Monthly Close Means No Surprises

A lot of contractors only look at their books when the CPA asks for them. That means once a year, you get a snapshot of what happened — months after you could have done anything about it.

Monthly bookkeeping changes that. Every month, your transactions are categorized, your accounts are reconciled, and you get a P&L and balance sheet that tells you exactly where the business stands. If margins are slipping, you see it in real time. If overhead is creeping up, you catch it before it becomes a problem.

Your Books Should Be Ready When Your CPA Needs Them

Tax season shouldn’t be a scramble. If your bookkeeping is current and accurate throughout the year, tax preparation becomes straightforward. Your CPA gets clean financials, your deductions are properly documented, and there’s no last-minute digging through bank statements trying to figure out what a charge from eight months ago was for.

The Bottom Line

Contractor bookkeeping isn’t complicated. But it does need to be done right. A clean chart of accounts, job-level cost tracking, monthly close, and clear reporting are the foundation that lets you actually understand your business’s financial health and make decisions with confidence.

If you’re a contractor who wants cleaner books and real visibility into your job profitability, schedule a free call with Prophet Accounting. We’ll talk through where your books stand and what it would take to get them right.