Estimated tax payment for 2020

[kevin_ny_2003]

I had to pay underpayment penalty in 2019 while filing my taxes . I want to avoid that in 2020. I already changed my tax withholding status to single from married at my employer but am concerned it may be still underpayment .
1) how do I calculate the estimated payment that I need to pay
2) what is the last date to pay the estimated payment for individuals?
3) if I mail a check on dec 31 , will that be considered covered for 2020?

Thanks
Kevin

1) How do I calculate what

[M-MTax]

https://www.irs.gov/individuals/tax-withholding-estimator

For federal withheld tax estimating and Jan. 15th is the last day to pay estimated for 4Q.

[kevin_ny_2003]

Can I pay the 2020 Estimated Taxes via https://directpay.irs.gov/

Is the form name 1040-ES?

Thanks

[DoninGA]

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@kevin_ny_2003 wrote:

Can I pay the 2020 Estimated Taxes via https://directpay.irs.gov/

Is the form name 1040-ES?

Thanks

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Yes, select estimated taxes, Form 1040ES and tax year 2020 

[kevin_ny_2003]

I just scheduled the estimated payment via the directpay site. But the payment date is showing Jan 19,2021 when I check the status now

Payment Status

Scheduled

Submission Date

January 15, 2021

Payment Date

January 19, 2021

Reason for Payment

Estimated Tax

Payment Type

1040ES (for 1040, 1040A, 1040EZ)

Tax Year for Payment

2020

But when I submitted the payment the payment date was showing as Jan 15, 2021.

Payment Status
Scheduled
Payment Date
January 15, 2021
Reason for Payment
Estimated Tax
Payment Type
1040ES (for 1040, 1040A, 1040EZ)
Tax Year for Payment
2020

Can you please confirm if I submitted the payment today via bank routing # and account# will that be considered covered before the cut off date of Jan 15, 2021?

Thanks

[DianeW777]

The payment information should be printed for your records as proof of payment date as you show in your question.  Your payment is considered made when it shows withdrawn from your account in the case of a debit transaction.

The IRS most often will rely on your evidence for proof of payment date when it's not clear.