Bookkeeping for contractors that keeps your books tax-ready all year

Bookkeeping for contractors means recording every job's income and costs, categorizing expenses, tracking subcontractor payments and sales tax, and keeping records your accountant can file from. BRIX keeps expenses categorized, tracks 1099 subcontractors and sales tax, and reminds you of quarterly estimated tax dates. BRIX does not file taxes or give tax advice.

What does bookkeeping for a contractor involve?

Contractor bookkeeping is recording what came in and what went out, tied to the right job and the right category, every week. That sounds like any small business, but trades shops carry extra weight: materials bought for specific jobs, subcontractors who need 1099s, sales tax rules that treat labor and materials differently by state, deposits and progress payments, and trucks and equipment that get depreciated.

The IRS lets you use any recordkeeping system that clearly shows your income and expenses, and expects you to keep the supporting documents (receipts, invoices, bank statements) for as long as they're needed to back up your return. That's the floor. The real reason to keep clean books is to know which jobs make money while you can still do something about it.

Why do contractors' books get messy?

Contractors' books get messy because the person who knows what every charge was for is on a job site all day. Receipts pile up in the truck, card charges sit uncategorized, and by the time anyone looks, nobody remembers whether that $340 supply-house charge was for the Miller job or for stock.

• Personal and business mixed. One card for everything turns year-end into a guessing game.
• Uncategorized transactions. Hundreds of "Ask My Accountant" lines that someone must sort later, usually at a higher hourly rate.
• Materials not tied to jobs. Without job tags you can't tell a profitable job from a losing one.
• Subs paid without a W-9. Then in January you're chasing tax IDs to file 1099s.
• Sales tax collected but not tracked. It's the state's money, sitting in your operating account.
• Quarterly estimates forgotten. Then April brings a big bill plus a possible penalty.

How BRIX helps with bookkeeping and taxes

1. 1

   Expenses stay categorized.

   BRIX keeps expenses categorized as they come in, so your chart of accounts stays clean and your profit and loss means something every month, not just in April. See our chart of accounts for contractors.

2. 2

   Income comes from the jobs.

   Invoices and payments come straight from the jobs BRIX tracked, and sync with QuickBooks along with the customer, so revenue in the books matches the work on the calendar.

3. 3

   1099 subcontractors are tracked.

   BRIX tracks what you pay each subcontractor through the year, so the year-end 1099 list is ready instead of reconstructed from bank statements.

4. 4

   Sales tax is tracked.

   BRIX tracks the sales tax you collect so you know what you owe the state when the return is due.

5. 5

   Quarterly tax dates come with a reminder.

   BRIX reminds you before each federal estimated tax due date, so you can set money aside and pay on time. How much to pay is a question for your tax professional; our quarterly estimated tax calculator helps you prepare for that conversation.

What is job costing, and why does it matter?

Job costing is tracking the revenue, labor, materials and subcontractor costs of each job so you can see its real profit. A shop can be busy and lose money if a few job types are underpriced. Job costing finds them. Without it, you only learn your margin once a year, from your tax return.

Job gross profit = Job revenue − (Labor + Materials + Subcontractors + Equipment and other direct costs)

BRIX keeps each job's quote, invoice and crew hours on one record, which is the raw material for job costing. In QuickBooks Online, job costing is done with projects or classes; we explain both in how to do job costing in QuickBooks and QuickBooks classes vs. projects. Try the numbers in the job costing calculator.

What tax dates should contractors know?

Self-employed contractors generally pay federal income and self-employment tax four times a year through estimated payments, and businesses that pay subcontractors file Form 1099-NEC each January. The IRS figures below are for tax year 2026. State dates and rules vary, so check your state's revenue department too.

Go deeper in quarterly estimated taxes for contractors, 1099s for subcontractors, sales tax on labor vs. materials and our full guide to contractor taxes. State rules are in the state guides, such as Texas and New York.

What's the best accounting software for small contractors?

For most small contractors, the accounting system is QuickBooks Online, and the real question is what feeds it. QuickBooks is good at being the books. It isn't built to answer the phone, chase estimates or remind a homeowner about an invoice. The setup that works is a job system that creates clean invoices and payments, synced into QuickBooks, with expenses categorized as they happen and an accountant reviewing monthly.

If you're still choosing a QuickBooks version or setting up your file, start with QuickBooks for contractors and the QuickBooks setup guide.

A month-end routine that keeps you tax-ready

1. Reconcile every bank and credit card account to the statement.
2. Clear the uncategorized pile. Nothing left in "Ask My Accountant".
3. Check that every finished job has an invoice and every payment closed an invoice.
4. Review open invoices and follow up on anything past due.
5. Confirm W-9s are on file for every subcontractor paid this month.
6. Set aside sales tax collected and your estimated tax savings in separate accounts.
7. Read the profit and loss statement and compare gross margin to last month.

The full list is in the bookkeeping checklist for contractors.