Essential June 2025 Tax Deadlines Every Business Owner Must Know

June 2025 brings a host of important compliance milestones for business owners, accounting professionals, and corporate leaders. Staying proactive with your tax responsibilities ensures your business avoids costly penalties, maintains financial stability, and upholds a stellar compliance reputation. Below, find a breakdown of all significant IRS and federal deadlines this month—plus best practices for staying on top of your filing obligations.

Image 1

Key June 2025 Business Tax Due Dates

June 16 – Monthly Federal Payroll Tax Deposit Deadline

If your business is subject to the monthly deposit schedule, June 16, 2025 is the deadline to remit your federal payroll tax liabilities for May. This includes:

  • Social Security tax
  • Medicare tax
  • Federal income tax withheld from employees
  • Nonpayroll withholdings (such as backup withholding, tax on pensions or annuities) when the monthly deposit rule applies

Timely deposits via the Electronic Federal Tax Payment System (EFTPS) are essential to avoid late payment penalties and interest. Assess your deposit schedule annually to ensure ongoing compliance, particularly as your total employment tax liability may change.

Image 2

June 16 – Corporate Estimated Tax Payments (Form 1120-W)

Calendar year C-corporations must deposit their second estimated income tax installment for 2025 by June 16. Use Form 1120-W or your business’s estimated tax worksheet to calculate your liability, taking into account projected income, credits, and deductions. Meeting this installment deadline is critical to avoiding underpayment penalties and ensuring sufficient cash flow throughout the tax year.

Important IRS Filing Considerations

Weekend and Holiday Adjustments

If a federal tax deadline falls on a Saturday, Sunday, or legal holiday, the due date automatically shifts to the next business day. Always confirm adjusted deadlines with the most current IRS calendar, as holidays or local observances can alter the normal schedule.

Disaster Area Filing Extensions

When the IRS designates a region as a federal disaster area, affected businesses may qualify for automatic extensions on tax filings and payments. Stay informed of current disaster declarations and extension dates by consulting these official resources:

Image 3

Stay Organized & Ahead of the Curve

For professional accountants and business owners alike, proactive planning is central to financial success. Leverage digital tools for calendar reminders, maintain updated compliance checklists, and consult with your CPA or tax advisor to ensure you remain fully compliant with evolving tax regulations. Staying ahead of key deadlines keeps your business on solid ground and ready to seize new opportunities with confidence.

Share this article...

Sign up for our newsletter.

Each month, we will send you a roundup of our latest blog content covering the tax and accounting tips & insights you need to know.

I confirm this is a service inquiry and not an advertising message or solicitation. By clicking “Submit”, I acknowledge and agree to the creation of an account and to the and .

We care about the protection of your data.