If you are making quarterly estimated tax payments to the IRS, the due date for the 2018 September 1st - December 31st quarter of the year is January 15th, 2019.
For payments made using IRS Direct Pay, you can make payments until 8PM EST, and for payments using a credit or debit card, payments can be made up to midnight on the due date.
If the due date for making an estimated tax payment falls on a Saturday, Sunday, or legal holiday, the payment will be considered on time if you make it on the next day that's not a Saturday, Sunday, or legal holiday.
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