In 2025, business owners must stay on top of key IRS tax deadlines to avoid penalties. Partnerships and S corporations must file by March 17, while C corporations and sole proprietors have until April 15. Estimated tax payments are due quarterly, and payroll tax returns follow a set schedule. Filing extensions are available but do not delay payment deadlines. Knowing the correct forms and dates helps ensure compliance and keeps your business running smoothly throughout the tax year.
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