September 2025 Reminders
September signals the end of Q3 and the beginning of the year-end ramp-up. It’s a crucial month for estimated tax payments, strategic financial planning, and finalizing quarterly bookkeeping tasks. Use this month to ensure your business is on track to finish the year strong. Here are your accounting and bookkeeping reminders for September 2025:
Accounting and Tax Deadlines
September 16: Q3 Estimated Tax Payment Due
- Q3 estimated tax payments are due on September 16, 2025 for:
- Sole proprietors
- Partnerships
- S-Corporation shareholders
- Corporations making quarterly payments
- Sole proprietors
- Review your YTD income and deductions to make an accurate payment and avoid penalties.
Sales Tax & Payroll Deadlines
- File your monthly or quarterly sales tax if your business is required to do so.
- Submit payroll tax deposits for August and prepare for upcoming Q3 filings.
Industry-Specific Licenses & Fees
- Check for any annual or quarterly license renewals, fees, or compliance reports required by your industry or local jurisdiction.
Bookkeeping Recommendations
Close August’s Books & Reconcile Accounts
- Reconcile bank accounts, credit cards, and loans.
- Ensure all income and expense transactions are categorized correctly.
- Address any discrepancies or outstanding transactions before month-end.
Prepare for Q3 Close
- Begin organizing financial data and documents for Q3 closeout.
- Schedule time with your accountant or bookkeeper for a quarterly review.
- Compile documents needed for Form 941 (due in October) and any state-specific payroll filings.
Review Accounts Receivable & Payable
- Run A/R and A/P aging reports.
- Follow up on overdue invoices.
- Make sure vendors are paid on time to maintain good relationships and avoid late fees.
Evaluate Subscription and Recurring Expenses
- Review all recurring payments and subscriptions.
- Cancel or downgrade tools that are no longer being used.
- Consider consolidating platforms to streamline operations.
Financial Planning & Strategy
Forecasting for Q4
- Use current YTD numbers to project revenue and expenses for Q4.
- Adjust budgets and spending plans accordingly.
- Identify if you’re on track to meet annual goals, and realign if necessary.
Tax Planning Begins Now
- Start preparing for year-end tax planning:
- Evaluate potential deductions.
- Plan for retirement contributions.
- Consider asset purchases before December 31.
- Evaluate potential deductions.
Evaluate Profitability by Service or Product
- Review your offerings to identify your most and least profitable areas.
- Reallocate resources or update pricing where appropriate.
Review Employee Performance and Compensation
- Begin planning for year-end bonuses, raises, or benefits changes.
- Revisit performance goals and team structure for Q4 and beyond.
Backup & Security Check
- Conduct a quick audit of your digital bookkeeping system:
- Ensure regular backups are being made.
- Update access permissions and passwords.
- Review any security features or data encryption settings.
Final Thoughts
September is your opportunity to reflect on the third quarter and lay the groundwork for a productive Q4. By staying ahead on estimated taxes, reviewing your financials, and adjusting your goals, you can move confidently into the final stretch of 2025.
Need help preparing for Q3 close or year-end tax planning? Reach out to VirtuCount Bookkeeping, Accounting, & Tax today. Let’s finish the year strong—together.
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