Industry Guide · 2026

Bookkeeping for Contractors: Know What Every Job Really Makes

Definition: contractor bookkeeping is the practice of tracking income and expenses by project — not just by month — so you know which jobs make money and which ones quietly lose it. It combines standard bookkeeping with job costing, subcontractor 1099 reporting, and cash-flow management across overlapping projects.

Why contractor bookkeeping is different

Most businesses sell the same thing every month. Contractors do not: every project has its own bid, its own timeline, its own crew, and its own mix of labor, materials, and equipment. Monthly totals hide the truth — a business can look profitable overall while two or three jobs are losing money. Job-based bookkeeping assigns every dollar of cost to the project that caused it.

Job costing: the profit report that matters

For each project, track:

Direct labor — wages and subcontractor payments tied to that job.
Materials — everything purchased for that specific project.
Equipment — rentals, fuel, maintenance, and depreciation allocated to the job.
Other direct costs — permits, dumpsters, travel, and subcontracted specialties.

Compare the total against the contract price (plus approved change orders) to get the true margin per job. Over time, these per-job reports show which types of work to bid more of — and which to stop bidding.

Change orders are revenue too: extra work agreed on mid-project should be documented, priced, and tracked as part of the job — not absorbed silently.

1099s for subcontractors

Payments of $600 or more to a subcontractor in a year are generally reported to the IRS on Form 1099-NEC. The practical system is simple:

Collect a signed Form W-9 from every subcontractor before the first payment — chasing paperwork in January is how filings go wrong.
Record every payment to the right payee through the year, in your books.
File the 1099s at year-end and send copies to your subcontractors.

Tracking materials and equipment

Materials bought for one job and used on another are one of the most common profit leaks in contracting. Keep supplier receipts tied to the project they were bought for, and log equipment usage — rentals, fuel, repairs — against the job it served. Clean records here do double duty: they make your job-cost reports accurate and they support your deductions at tax time.

Cash flow across overlapping projects

Contractors rarely get paid in one lump sum. Deposits, progress payments, and retainage arrive on different schedules while payroll and suppliers demand payment weekly. Practical habits:

Bill on schedule — late invoices are the most common cause of contractor cash crunches.
Track accounts receivable by project, so you know exactly who owes what on which job.
Keep a simple rolling forecast: expected receipts vs. upcoming payroll and material bills for the next 4–6 weeks.
Separate project deposits from operating cash in your books — a deposit is not profit until the work is done.

Frequently asked questions

What is job costing?

Job costing means tracking every cost of a single project — direct labor, materials, equipment, permits, and other direct costs — against its contract price, so you know the true profit of each job instead of only seeing monthly totals.

Do I need to send 1099s to my subcontractors?

Generally, yes: payments of $600 or more to a subcontractor in a year are reported to the IRS on Form 1099-NEC. Collect a signed Form W-9 from every subcontractor before the first payment, record each payment through the year, and file at year-end.

How should I handle materials bought for multiple jobs?

Tie each supplier receipt to the project it was purchased for at the time of purchase. When materials move between jobs, reallocate the cost so each job-cost report stays accurate and your deductions are supported.

Why does my business show a profit but I have no cash?

This is common in contracting: profit sits in unpaid invoices and retainage while payroll and suppliers are due now. Track accounts receivable by project, bill on schedule, and keep a rolling 4-to-6-week forecast of expected receipts versus upcoming bills.

Books that keep up with your jobs.

We set up job costing, track your 1099s, and keep every project reconciled — CPA and MBA led.
Call (954) 352-3927 or email totalsourcenet@gmail.com

General educational information only — not tax or legal advice. Tax rules and reporting thresholds change; confirm your situation with a qualified professional. TheRemoteBookkeepers.com, Hollywood, FL.