Get a Head Start: Your Year-End Accounting Checklist

As the holiday season approaches, small business owners naturally shift their focus toward closing out the operational year and preparing for the annual tax filing. At Andrew Chen CPA LLC, we want to thank our clients for their continued trust throughout this past year. Transitioning smoothly from holiday festivities to year-end financial closing requires proactive action before the calendar turns. Waiting until spring to evaluate your books severely restricts the strategies available to lower tax liabilities and improve cash flow. Taking time in November and December to review a clear accounting checklist ensures your financial records are clean, complete, and optimized before December 31.

Managing Income and Expense Timing

For businesses using the cash method of accounting, the timing of when income is received and expenses are paid directly impacts your current-year taxable income. If your business has experienced a highly profitable year, you might evaluate accelerating deductible business expenses before December 31. This can include paying recurring vendor invoices early, stocking up on necessary office supplies, or prepaying certain operational expenses permissible under IRS rules.

Conversely, if you expect your marginal tax rate to be higher next year, accelerating income into the current year by issuing invoices promptly and following up on collections before December 31 may be advantageous. Accrual-basis businesses should also review open receivables and unbilled work to ensure revenue is recognized in the proper tax period. Evaluating revenue and expense timing with a CPA before year-end gives you actionable choices while the tax year remains open.

Maximizing Retirement Contributions

Retirement plan contributions remain one of the most effective tools for small business owners to build long-term personal wealth while reducing current business taxable income. Depending on your business structure—whether you operate as a sole proprietorship, S-corporation, or partnership—different plan options offer varying contribution flexibility and tax benefits.

For owner-operated businesses, plans such as a Simplified Employee Pension IRA (SEP-IRA) or an Individual/Solo 401(k) permit substantial deductible contributions. Establishing or funding these accounts requires attention to specific tax deadlines. While some plan types allow contributions up to the extended tax filing deadline, establishing certain plans (like a Solo 401(k)) generally requires action before December 31. Reviewing your net income projections late in the year allows you to determine the optimal contribution amount without compromising your operational cash reserves.

Reviewing Major Asset Purchases and Equipment Write-Offs

If your business placed machinery, equipment, vehicles, or computers into service during the year, or plans to do so before year-end, you should review the tax treatment of these capital expenditures. Federal tax law allows businesses to deduct the cost of qualifying eligible property in the year it is placed in service, subject to specific regulatory thresholds and phase-out rules.

It is critical to note that equipment must be fully placed in service—meaning ready and available for specific use in the business—on or before December 31 to qualify for current-year tax deductions. Purchasing equipment at the end of December that arrives or becomes operational in January pushes those tax deductions into the next tax year. Coordinating capital expenditures with your overall profitability strategy ensures you receive maximum tax efficiency.

Substantiating Charitable Contributions

Charitable giving is a meaningful way for business owners to support local communities while managing tax exposure. However, IRS rules governing charitable contribution deductions require strict documentation. Deductions can be disallowed entirely during an audit if proper records are missing.

For corporate donations or personal itemized deductions passed through from entity structures, maintain bank records, canceled checks, or credit card statements for all monetary contributions. For any single contribution of $250 or more, you must obtain a written acknowledgment from the qualified charitable organization prior to filing your tax return. This receipt must state the dollar amount contributed and explicitly confirm whether the organization provided any goods or services in exchange for the donation. Organizing these receipts before year-end eliminates stress during tax preparation.

What to Do Next

Proactive tax planning happens before December 31, not in April. Reviewing income timing, retirement funding, asset write-offs, and charitable documentation today protects your bottom line for the year ahead.

If you want to evaluate your business's year-end tax position and implement tailored strategies before the deadline, we invite you to book a 15 Minute Discovery Call with Andrew Chen, CPA.