September 15, 2025 IRS Deadlines: Tax-Saving Strategies for Business Owners

September 5, 2025
Close-up of a calendar with a red pin marking September 15, 2025, highlighting IRS deadlines for business owners

September 15, 2025, is more than a date on the calendar. It’s a critical day for business owners to manage taxes efficiently and protect cash flow. This day marks two major obligations: Your third-quarter estimated tax payment (individuals and business owners) Final extended filings for S-corporations (Form 1120-S) and partnerships (Form 1065) Missing deadlines or…

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