Bookkeeping for Contractors: Know What Each Job Earns

October 12, 2026 | Katie Thoma

What bookkeeping for contractors needs to tell you

Bookkeeping for contractors records income and costs by job while keeping the business’s accounts accurate, so you can see what each project earns. A useful system connects receipts, bills, labor records and customer invoices to the right job, then reviews those results alongside overhead and upcoming payments.

For an owner running a plumbing, landscaping or construction business, the practical questions are specific: Which jobs used more labor than expected? Did the extra work get billed? What payments need to arrive before the next round of supplier bills?

Job costing means tracking costs against a particular project. It gives you a way to compare the work you priced with the work you actually delivered. Your company reports then show how those jobs fit into the business as a whole.

Keep three questions separate:

• Job result: What income and costs have been assigned to this project?
• Business profit: What remains after the company’s expenses, including overhead?
• Cash available: What has been collected, and what payments are coming due?

A busy schedule or a healthy bank balance cannot answer all three. The goal is a set of records you can explain and use when deciding what to quote, buy or schedule next.

Connect each receipt, hour and invoice to a job

Useful bookkeeping for contractors starts where the work happens. The person buying materials or recording hours usually knows which job they belong to; give that person a simple way to pass the information along.

Choose a consistent job identifier, such as a project number paired with the customer name. Use it on receipts, time records, subcontractor bills and billing paperwork. If one customer has several projects, the customer name alone may be too broad.

• Material receipt: Add the job identifier, purchase purpose and any split between jobs. This identifies which project used the supplies.
• Time record: Include the job identifier, work date, hours and work performed. This shows where the crew’s time went.
• Subcontractor bill: Identify the job and scope covered, so outside work reaches the correct project.
• Customer invoice: Identify the job and work or billing stage covered, so you can see what has been billed.
• Change order: Keep the job identifier, approval and billing status together, so added work can be traced to its invoice.

Consider a hypothetical plumbing crew buying parts for two projects on one receipt. Mark which items belong to each project while the purchase is fresh, and retain the receipt. That gives the bookkeeper support for splitting the cost instead of guessing from the supplier’s name weeks later.

Decide who answers questions about incomplete records. A shared receipt folder works better when someone owns the follow-up and the owner knows which items still need clarification.

Separate direct costs from overhead

Direct costs belong to identifiable jobs: materials purchased for a particular installation, a subcontractor’s work on that project, or equipment rented for that job. Overhead supports the company more broadly, such as office rent and general administrative expenses.

For equipment used across projects, agree on a consistent treatment with your bookkeeper or accountant. Use the agreed allocation method consistently so job margins remain comparable. Before comparing margins, ask whether the reports include only direct costs or also some share of overhead.

Label labor estimates and posted costs clearly

Labor deserves its own check because a report may show an estimate before the related payroll expense is recorded. Intuit’s project labor-cost guidance distinguishes posted payroll expenses from hourly cost estimates and explains that changing the project’s labor-cost view does not change the books.

Know which method you are reviewing and whether the underlying hours are complete. Keep records from your payroll provider available for recording and checking posted expenses. A preliminary labor estimate can help you monitor an active job, but label it clearly before using it to judge the final result.

Keep billing changes and cash timing visible

Added work needs a path from approval to billing. Keep a change-order record with the scope change, customer approval, related costs and invoice status, rather than relying on a conversation someone remembers.

Some projects use progress billing, where invoices are issued in stages. Others include retainage, where the customer holds back part of the payment until completion. Intuit’s construction bookkeeping guide explains these concepts alongside job costing and change orders.

Use the billing arrangement that applies to your contract, and keep its status visible. For each active job, you should be able to distinguish approved work, work already invoiced, payments received and amounts still outstanding.

In a hypothetical landscaping project, the customer adds another planting area after the original quote. The crew records the added materials and hours, but the billing file still contains only the original scope. A review of the approval and invoice records reveals the follow-up question: has the approved addition been billed?

Even when a job’s recorded result is positive, an unpaid invoice does not fund a supplier payment today. Other jobs and company expenses also draw on cash. Our article on the hidden costs of cash-flow mismanagement explores that broader business problem.

Ask your accountant how deposits, longer projects and revenue recognition should be handled in your particular books. Keep the accounting treatment consistent when comparing jobs or reporting periods.

Use QuickBooks to review job profitability

QuickBooks can support bookkeeping for contractors when the file’s setup and daily records fit the job workflow. Intuit confirms that Projects in QuickBooks Online Plus or Advanced tracks project income and costs. Its guidance also identifies project estimates and estimate-versus-actual reporting as Advanced features.

Assign relevant transactions to the correct customer/project when recording income and costs. A bank connection can bring in a supplier transaction, but the supplier name may not tell you which project used the materials. Your job labels supply that context.

Before interpreting a report, check these items:

• Are the relevant income and cost transactions assigned to the project?
• Are recent receipts, subcontractor bills and time records included?
• Is labor based on hourly estimates or posted expenses?
• Are you reviewing a completed job or one with more costs still expected?

Navigation can vary as QuickBooks changes. Focus first on what the report contains and what remains missing. If your current plan or setup cannot produce the view you need, discuss the requirement before changing software. Moxie’s QuickBooks management support can help with setup and ongoing file management.

Build a repeatable routine for bookkeeping for contractors

A practical routine assigns responsibility for records, payments and review. The SBA’s business finance guidance emphasizes proper bookkeeping and responsibility for receivables, payables, available cash and bank reconciliation.

The following is a suggested cadence; adjust it to your transaction volume and project length.

Each week: hand off records and check billing

Send labeled receipts, bills, time records and approved changes to the person maintaining the books. Check outstanding customer invoices and identify who will follow up. Resolve missing job assignments while the crew can still explain the work.

Each month: reconcile and discuss the numbers

Compare the books with bank and credit-card statements before relying on financial reports. Intuit’s reconciliation guidance calls for adding and categorizing statement-period transactions, then matching recorded transactions to the statement and resolving differences.

Reconciliation checks account records; it does not prove that every expense has the correct job assignment. Review that separately. If older balances need investigation, our QuickBooks cleanup checklist covers the broader cleanup process.

Then discuss the job reports alongside company expenses and upcoming payments. Ask what changed, what still needs explanation and what decision follows. A report becomes more useful when that conversation ends with a clear action and an owner for it.

After a job closes: compare the plan with the work

Review the original scope, approved additions, recorded costs and remaining billing questions. In a hypothetical landscaping job, extra supply trips increase crew time. Check purchasing and scheduling before concluding that the selling price was the only problem.

Carry one lesson into the next similar quote: a revised material allowance, a clearer scope description or a different delivery schedule.

When to add bookkeeping or controller support

Consider more support when job assignments stay unresolved, reports arrive too late for decisions, or differences between your records and reports remain unexplained. You may also want someone to walk through results with you and help improve the record handoff.

Before engaging a provider, describe the reporting you need and the complexity of your projects. If you require specialized construction reporting, bonding support or contract-specific work-in-progress schedules, confirm the provider’s scope and involve the appropriate specialist.

Moxie’s approach combines organized records with a conversation about what the numbers mean. For bookkeeping for contractors, that begins with understanding your workflow and agreeing on the reports that will help you run the business.

Frequently Asked Questions

Can I do bookkeeping for my contracting business myself?

Yes, if you can consistently maintain labeled job records, reconcile accounts and review useful reports. As the number of active jobs or transactions grows, reassess whether you have enough time for the follow-up as well as the data entry.

Can QuickBooks track contractor job costs?

Yes. QuickBooks Online Plus and Advanced offer Projects for tracking project income and costs. The result depends on correct transaction assignments, complete records and a clearly understood labor-cost method.

How much does contractor bookkeeping cost?

The scope depends on your accounts, transaction volume, active jobs, record condition and reporting needs. Ask for a proposal that explains what is included, who supplies the records and whether project review is part of the service.

Why can a profitable job still leave cash tight?

Customer payments may arrive after the costs are due, and other business obligations also use cash. A job report, outstanding-invoice list and view of upcoming payments answer different parts of that question.