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June 2025 Key Tax Deadlines for Businesses: What Accountants and Entrepreneurs Must Know

Effectively managing your business’s tax calendar is essential for sustained compliance and financial health. June 2025 brings pivotal tax due dates for U.S. employers and corporations. As trusted business advisors, accountants and business owners must stay vigilant to avoid costly penalties and ensure seamless financial operations.

Critical June 2025 Tax Deadlines for Businesses

Staying compliant with federal deposit and estimated tax deadlines minimizes risk and supports strong internal controls. Here’s your expert guide to the must-know business tax due dates this June:

June 16, 2025 – Employer’s Monthly Federal Tax Deposit Due

If you are an employer subject to IRS monthly deposit rules, this is a crucial deadline. By June 16, you must remit:

  • Withheld federal income taxes
  • Social Security and Medicare (FICA) taxes
  • Nonpayroll withholding (such as backup withholding, gambling winnings, or certain government payments), if the monthly deposit schedule applies
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Best Practice: Automate your payroll tax reminders and confirm all IRS deposits via EFTPS to minimize human error.

June 16, 2025 – Second Estimated Tax Payment for Calendar Year Corporations

Corporations operating on a calendar year basis must deposit their second installment of estimated federal income tax by June 16, 2025. This includes C-corporations and entities taxed as corporations.

Estimated tax payments are governed by IRS Form 1120-W, and accurate quarterly projections are essential to avoid underpayment penalties.

Navigating Weekend and Holiday Adjustments

If any tax deadline falls on a Saturday, Sunday, or legal holiday, the IRS automatically extends the due date to the next business day. This provision provides flexibility but should not be interpreted as leeway to delay.

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Disaster Area Filing Extensions

When the federal government declares a disaster area, affected businesses may receive automatic filing and payment extensions. Check your eligibility and updated deadlines via official resources:

Pro Tip: Work closely with your accountant or enrolled agent to proactively claim any tax relief and avoid missed opportunities.

How Professional Accountants Streamline Tax Compliance

Engaging a qualified CPA or tax preparer can dramatically simplify managing monthly and quarterly deposit schedules. Industry-leading practices include:

  • Deploying cloud-based tax calendaring to flag key IRS deadlines
  • Customized workflows for payroll, corporate, and nonpayroll withholding deposits
  • Up-to-date knowledge of legislative changes affecting business taxation
  • Comprehensive pre-deadline reviews to prevent discrepancies
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Key Takeaways for June 2025 Business Tax Planning

  • Set automated reminders for all IRS deposit and estimated tax deadlines
  • Consult with your accountant about projections and ensure sufficient liquidity for timely deposits
  • Monitor disaster relief announcements for potential filing extensions
  • Embrace technology and ongoing education to maintain compliance and optimize financial strategy

Staying ahead of your business tax obligations in June is more than a compliance exercise—it’s the cornerstone of financially healthy, well-managed enterprises. For actionable guidance tailored to your entity, reach out to a trusted accounting professional today.

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