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Tax Planning Year-End

Year-End Tax Planning: A Checklist for Business Owners

December 20, 2025 • 6 min read

The end of the year is crunch time for small business owners. Between holiday忙碌 and year-end planning, tax season can feel overwhelming. But with the right checklist, you can enter the new year with confidence and potentially save money on your tax bill.

Why Year-End Planning Matters

Many tax strategies must be implemented before December 31st. Waiting until tax filing season in April means missing out on deductions and planning opportunities. Use this checklist to ensure you're not leaving money on the table.

☑️ December Tax Planning Checklist

1. Review Your Income and Expenses

Before year-end, get a clear picture of your financial situation:

  • Run a year-to-date profit and loss report
  • Compare to previous years
  • Identify any irregular income or expenses
  • Determine if you're on track for a profit or loss

2. Maximize Retirement Contributions

If you have a SEP IRA, Solo 401(k), or other retirement plan, maximize contributions before year-end:

  • SEP IRA: Up to 25% of net self-employment income
  • Solo 401(k): Employee + employer contributions (catch-up contributions if over 50)
  • Contributions must be made by December 31st to count for 2026

3. Time Your Income and Expenses

If you're close to a tax bracket boundary, consider:

  • Accelerate expenses: Prepay supplies, equipment, or insurance for next year
  • Defer income: If possible, delay invoicing until January
  • Purchase equipment: Take advantage of Section 179 deductions

4. Review Account Balances

Make sure your books are accurate:

  • Reconcile all bank and credit card accounts
  • Review accounts receivable - follow up on outstanding invoices
  • Check inventory counts if applicable
  • Review accounts payable - pay any outstanding bills

5. Review Estimated Tax Payments

Make sure you've made all required quarterly payments:

  • Federal income tax estimated payments
  • State income tax estimated payments
  • Self-employment tax
  • Check if you need to adjust Q4 payment based on year-end projections

6. Organize Your Documentation

Gather all tax documents you'll need:

  • W-2s for employees (due to employees by Jan 31)
  • 1099s for contractors (due to contractors by Jan 31)
  • Bank and investment statements
  • Receipt documentation for major purchases
  • Loan interest statements (1098)

7. Plan for Next Year

Use year-end to set up for success next year:

  • Set up a separate business savings account for taxes
  • Review your chart of accounts - simplify if needed
  • Consider hiring needs for the coming year
  • Set financial goals and budget for 2027

Important Year-End Dates

Date Deadline
Dec 31, 2026 Last day for most retirement contributions
Jan 15, 2027 4th quarter estimated tax payment due
Jan 31, 2027 W-2s and 1099s due to recipients
Mar 15, 2027 S-Corp and Partnership tax returns due
Apr 15, 2027 Sole proprietor and LLC tax returns due

Need Help?

Year-end tax planning can be complex, especially if your business has grown or changed during the year. We help small businesses organize their books and plan for a smooth tax season.

Let's Make Tax Season Stress-Free

Contact us before year-end to review your books and identify planning opportunities. The best time to plan is now, before December 31st.

Schedule Free Consultation