The end of the year is crunch time for contractors and small business owners — and not just because of the holidays. Q4 is when the financial decisions you make (or don’t make) have the biggest impact on your tax bill, your loan-readiness for next year, and the overall health of your business. This checklist gives you a comprehensive, actionable end-of-year bookkeeping roadmap for contractors and small businesses, covering everything from reconciling accounts to maximizing deductions before December 31st.
Why End-of-Year Bookkeeping Matters So Much
Many business owners treat bookkeeping as a tax-time necessity. The reality is that year-end bookkeeping sets the foundation for the entire next year — it determines your accurate tax liability, gives you a clean starting point for your new fiscal year, provides the financial statements you need for loans or bonding, and reveals which business decisions drove profitability (or hurt it). Contractors who do thorough year-end bookkeeping almost always find deductions, adjustments, and savings their competitors miss.
November: Start Early
Review All Open Invoices
Pull your accounts receivable aging report in QuickBooks. Any invoice that is 60+ days overdue needs immediate attention — phone calls, demand letters, and if necessary, a mechanic’s lien (in California, liens must generally be filed within 90 days of project completion). Every dollar collected before year-end improves your cash flow and your financial statements.
Review Outstanding Retainage
Check your retainage receivable account. Have all substantially complete projects had retainage released? Follow up aggressively on retainage from projects completed in Q3 and Q4. California law requires retainage release within 45–60 days of project completion — if it’s been longer, you have legal remedies available.
Pay Outstanding Bills to Lock In Deductions
If you’re on cash-basis accounting, expenses are deductible in the year they’re paid. Pay any outstanding vendor invoices, supplier bills, and subcontractor payments before December 31st to capture the deduction this tax year. This includes insurance premiums, equipment rentals, tool purchases, and professional services.
December: Lock In Tax Savings
Make Equipment and Vehicle Purchases
Section 179 allows you to deduct the full cost of qualifying equipment and vehicles purchased and placed in service during the tax year. The 2024 Section 179 deduction limit is $1,160,000. If you’ve been thinking about a new truck, trailer, compressor, or other equipment, buying before December 31st can generate a substantial deduction. Bonus depreciation (currently 60% for 2024) applies to the remaining cost.
Make Retirement Contributions
If you have a SEP-IRA, Solo 401(k), or SIMPLE IRA, maximize your contributions before year-end (or by the tax filing deadline with extension, for SEP-IRAs). A SEP-IRA contribution of 25% of net self-employment income can reduce your taxable income by tens of thousands of dollars. If you don’t have a retirement plan yet, a SEP-IRA can be established and funded all the way until your tax return is filed (including extensions).
Review Your S-Corp Salary
If you operate as an S-Corporation, review your reasonable salary for the year. The salary amount affects your self-employment tax exposure and your ability to maximize retirement contributions. Work with your CPA and bookkeeper to make any necessary year-end payroll adjustments before December 31st.
Prepay Business Expenses
Under the “12-month rule,” you can deduct a prepaid expense in the current year if the benefit doesn’t extend more than 12 months beyond the payment date. Consider prepaying next year’s business insurance premium, your QuickBooks subscription, professional memberships, and other recurring costs in December to pull those deductions into the current tax year.
Year-End Reconciliation Checklist
Reconcile All Bank Accounts
Every bank account and credit card account must be reconciled through December 31st. This means your QuickBooks balance matches your bank statement balance exactly, every transaction is categorized correctly, and there are no unexplained discrepancies. Don’t let this drag into February — it complicates your tax return and can hide errors.
Verify Petty Cash
If you maintain a petty cash fund, count and reconcile it at year-end. Record any unrecorded cash expenditures and ensure the physical cash on hand matches your books.
Review and Clean Up Job Cost Accounts
Close out completed jobs in QuickBooks. Ensure all job costs have been properly assigned to the correct projects. Review the Project Profitability report for the year — this is your most important annual report as a contractor. Identify your most and least profitable job types as input for next year’s bidding and business development strategy.
Prepare 1099s for Subcontractors
You must issue a 1099-NEC to any individual or unincorporated business you paid $600 or more during the year for services. As a contractor, this typically includes subcontractors, laborers paid as independent contractors, and professional service providers like attorneys or consultants. Collect W-9 forms from all vendors before year-end — it’s much harder to get them in January. File 1099s with the IRS and recipients by January 31st. Penalties for late or missing 1099s can be significant.
Verify Employee W-2 Information
Confirm that all employees’ names, SSNs, and addresses in QuickBooks match their W-4 forms. Any errors will need to be corrected before W-2s are filed with the SSA in January. W-2s must be provided to employees by January 31st.
January: Final Year-End Tasks
Print and Review Final Financial Statements
Generate and review your full-year Profit & Loss Statement, Balance Sheet as of December 31st, and Cash Flow Statement for the year. Compare to the prior year. Are revenue and gross margins trending in the right direction? Is overhead under control? Are there any account balances that look unusual?
Schedule Your Tax Planning Meeting
Send your finalized year-end books to your CPA no later than the first week of February. The earlier you file, the more time your CPA has to identify last-minute strategies and the better your chances of avoiding an extension. Include your prior year tax return, all 1099s issued and received, and any documentation of major purchases or capital transactions.
Frequently Asked Questions
When is the deadline to file 1099s in California?
Federal 1099-NEC forms must be filed with the IRS and provided to recipients by January 31st. California requires businesses to file 1099s with the FTB as well. Failing to file on time results in penalties of $50–$310 per missing form, depending on how late they are.
What records should contractors keep for tax purposes?
Keep all receipts, invoices, bank statements, payroll records, vehicle mileage logs, and contracts for at least 7 years. California and the IRS can audit returns up to 3 years back for regular returns and 6 years if substantial income is omitted. For payroll records, California requires a 4-year retention period.
What’s the fastest way to catch up on my books if I’m behind?
Hire a bookkeeper who specializes in contractor cleanups. At Bookkeeping Champs, we regularly take on catch-up projects where we reconstruct months or years of transactions from bank statements, credit card records, and receipts. The faster you address it, the less it costs — and clean books unlock deductions that messy books miss.
For more information, see our guide on available tax deductions.
For more information, see our guide on how much to set aside for taxes.
For more information, see our guide on bank reconciliation.
For more information, see our guide on payroll year-end tasks.
Don’t Face Year-End Alone
Bookkeeping Champs offers comprehensive year-end bookkeeping and cleanup services for contractors and small businesses throughout Los Angeles, Ventura County, and the San Fernando Valley. We reconcile your accounts, close your books cleanly, prepare you for tax season, and make sure you capture every deduction you’ve earned. Call (818) 679-4451 — don’t wait until December.
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