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January
15
  • Final federal and state estimated tax payment for the prior year
31
  • W-2 Forms to employees
  • 1099 Forms to recipients of certain payments

February
28
  • File form W-3 with Copy A of W-2 to Social Security Administration
  • File Form 1096 with Form 1099 to Internal Revenue

March
15
  • Corporate Income Tax Returns due
  • S Election due, if you wish to be taxed as an S Corporation
  • Oklahoma Business Personal Property Rendition due

April
15
  • Individual Income Tax Returns due
  • IRA Contributions due
  • Individual first installment of Estimated Income Taxes due
  • Partnership Tax Returns due
  • Corporation first installment of Estimated Income Tax due

June
17
  • Individual second installment of Estimated Income Taxes due
  • Corporation second installment of Estimated Income Tax due

July
1
  • Oklahoma Corporate Franchise Tax Return due
15
  • Extended Partnership Tax Returns due
31
  • Employee Benefit Forms 5500 or 5500EZ due

August
15
  • Extended Individual Income Tax Returns due

September
16
  • Individuals third installment of Estimated Income Tax due
  • C Corporations and S Corporations Extended Income Taxes due
  • Corporations third installment of Estimated Income Taxes due

November
any
  • Request employees to complete new W-4 if they want to change for following year
  • Request each eligible employee who wants to receive advance payments of the Earned Income Tax Credit to fill out a new W-5 Form

December
16
  • Corporations fourth installment of Estimated Income Taxes due