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2020 Tax year ends

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2020 US non-employee compensation reporting (Form 1099-NEC & 1099-MISC) due date

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Delaware annual franchise tax return and payment due

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2020 US S-Corporation tax return (Form 1120-S) or extension due date

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First 2021 estimated corporation tax payment due

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2020 US Corporation tax return (Form 1120), extension and corporation tax payment due date

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Second 2021 Corporation tax estimated payment due

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Extended filing deadline for 2020 US S-Corporation (Form 1120-S) returns

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Third 2021 estimated corporation tax payment due

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Extended filing deadline for 2020 US Corporation (Form 1120) tax returns

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Fourth 2021 Corporation tax estimated payment due

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2021 Tax year ends