You will need your corporate ID number in order to make these payments.  

Corporate ID Search

The corporate ID number is the Entity Number without the "C"  
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Note: If you are an LLC being taxed as an C Corp, you cannot search for your corporate ID number this way

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2020 Tax Return Payment
See email for amount owed

C Corp Due: 04/15/21

Payment Link

Entity type: Corporation
Entity ID: See email
Corporate Form Type: 100
Payment Type: Original Return Payment (Form 100)
Period Beginning Date: 01/01/20
Period Ending Date: 12/31/20

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 2021 Estimated Tax Payment

Payment Link

Due 04/15/21 ($800 Minimum),
6/15/21, 9/15/21, 12/15/21

Entity type: Corporation
Entity ID: See email
Corporate Form Type: 100
Payment Type: Estimated Tax Payment (Form 100ES)
Period Beginning Date: 01/01/21
Period Ending Date: 12/31/21

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*Due dates are for calendar year filers