Construction Bookkeeping Year-End Checklist for Contractors and Trade Businesses

As the year winds down, most contractors are still juggling job sites, client deadlines and keeping crews on track. But before you hang up your hard hat for the holidays, it’s worth taking a few hours to wrap up your books.

Year-end bookkeeping is a chance to make sure your numbers are accurate so you’re set up for a stronger year ahead. Construction businesses have their own bookkeeping quirks, from long job timelines and retainage to subcontractor 1099s and multiple tax rules, so having a checklist helps you close out the year cleanly and confidently.

Let’s walk through the key steps in this construction bookkeeping year-end checklist, so you can wrap up the year with confidence.

Step 1: Reconcile All Bank and Credit Card Accounts

Start by making sure your books match what actually happened in your bank. Compare your bank and credit card statements with QuickBooks (or whichever software you use).

If you spot any discrepancies, now’s the time to fix them. Maybe a deposit didn’t clear, or a payment was entered twice. Reconciling ensures your books reflect reality. If this step is skipped, you risk underreporting income or overstating expenses, both of which can create big headaches at tax time.

Step 2: Review Outstanding Invoices

Check who still owes you money. Run an aging report to see which invoices are past due and follow up for collection before the year ends.

If there are invoices that won’t ever get paid, write them off so your income stays accurate. For ongoing jobs, double-check that your progress billing and retainage are entered correctly, as you don’t want to count money you haven’t earned yet.

Step 3: Verify Outstanding Bills

Next, take a look at what you owe. Run an Accounts Payable report and make sure all vendor and subcontractor bills are recorded.

This is also a good time to decide whether to pay certain bills before year-end. Depending on your situation, it could lower your taxable income for the year.

If you forget to record expenses, your profits will look higher than they really are and you might end up paying more taxes than you need to.

Step 4: Review Job Costing and Work in Progress (WIP)

This is where most contractors find their biggest surprises. Go through each open job and make sure all costs, including materials, labor, subcontractors, and equipment rentals, are assigned to the right project.

Compare your estimated costs with what you actually spent. If something is running over budget, it’s better to catch it now.

Accurate WIP reports help you see how your jobs are really performing and give your accountant the right numbers to work with come tax season.

Step 5: Update Fixed Assets and Depreciation

Bought a new truck? Trailer? Piece of equipment?

Make sure these are recorded as fixed assets, not just regular expenses.

Remove anything you sold or no longer use, and ask your accountant about depreciation. Many contractors qualify for valuable deductions, like Section 179, so be sure to keep accurate records.

Step 6: Collect W-9s and Prepare for 1099s

If you paid subcontractors more than $600 this year, you’ll need to issue them a 1099-NEC form.

Check that you have a W-9 on file for everyone you paid by check, ACH, or cash. Payments made via credit card or PayPal are reported separately by those processors, so you don’t need to send a 1099 for those.

If you’re missing any W-9s, collect them now, not in January when deadlines and penalties start looming.

Step 7: Review Payroll Records

Payroll is one of the trickiest parts of construction bookkeeping, especially with different crews and locations.

Make sure all wages, withholdings, and employer taxes are accurate. Confirm that your year-end totals match your quarterly filings and that workers are correctly classified as employees or subcontractors.

Each state has its own payroll rules (like Colorado’s FAMLI program or Denver OPT), so make sure you’re up to date. Mistakes here can lead to costly penalties.

Step 8: Confirm Sales Tax Compliance

If you work across multiple cities or counties, this is the time to double-check your sales tax filings.

Make sure all payments match what you actually filed and that there are no outstanding notices. Cleaning up any discrepancies now saves a lot of stress later.

Step 9: Tidy Up Your Chart of Accounts

Think of this as decluttering your books. Merge duplicate accounts, reclassify expenses that ended up in the wrong spot (like fuel showing under office supplies), and clean up any “Ask My Accountant” transactions.

A well-organized chart of accounts makes it easier to read your reports and gives you better insight into how your business is performing.

Step 10: Run Your Year-End Reports

Once your books are clean, it’s time to look at the big picture.

Run your key reports:

• Profit & Loss Statement: See your total income and expenses.
• Balance Sheet: Check that your assets and liabilities are accurate.
• Job Profitability Report: Spot which projects made you money and which didn’t.
• Cash Flow Statement: Understand where your cash came from and where it went.
  

These reports help you make smarter decisions for next year, like which types of jobs to bid on and where you might need to tighten margins.

Step 11: Meet with Your Bookkeeper or CPA

Don’t wait until tax season to check in with your bookkeeper or accountant; a year-end review can help you plan ahead.

Ask about tax-saving strategies like accelerating expenses, deferring income, or using Section 179 deductions. Review whether your accounting method (cash or accrual) still fits your business, and talk through your goals for the new year, whether that’s hiring, buying equipment, or expanding into new services.

Early planning gives you more options and fewer surprises in April.

If you want to know more about cash and accrual accounting methods, read it here.

Start the New Year Strong

Closing out your books isn’t just about tying up loose ends. It’s about giving yourself a clear view of your business so you can make smarter decisions in the year ahead.

At Aladdin Bookkeeping, we help contractors, painters and HVAC professionals keep their books clean and compliant. From year-end reviews to full-service bookkeeping, we make sure your numbers work as hard as you do.

If you’d rather spend your December finishing jobs than sorting receipts, let us handle the bookkeeping.

Schedule a consultation and start the new year with confidence.