How do you pay estimated taxes after you've filed an extension?

[bosso3]

The same way you would file them as you did before filing an extension.

See  https://www.irs.gov/businesses/small-businesses-self-employed/estimated-taxes   and  

https://www.irs.gov/publications/p505    and

https://www.irs.gov/forms-pubs/about-form-1040-es

[VolvoGirl]

Estimates for this year 2022?  The extension was to file your 2021 return.   

Here are the blank Estimates and instructions…..

http://www.irs.gov/pub/irs-pdf/f1040es.pdf

The 1040ES quarterly estimates are due April 18, June 15, Sept 15 and Jan 17, 2023.  Your state will also have their own estimate forms.

Or you can pay directly on the IRS website https://www.irs.gov/payments

Be sure to pick the right kind of payment and year.....2022 Estimate

[DianeW777]

You can pay online with a direct transfer from your bank account using Direct Pay, the Electronic Federal Tax Payment System, or by debit or credit card.  You can also pay by phone using the Electronic Federal Tax Payment System or by debit or credit card. 

• Pay Online

Confirmation number. You’ll receive a confirmation number when you pay online or by phone. Enter the confirmation number on Form 4868 and keep it for your records. 

Note: If you use an electronic payment method and indicate the payment is for an extension, you don’t have to file Form 4868. You should pay the entire estimated tax owed or you could be subject to a penalty. Your extension will be automatically processed when you pay part or all of your estimated income tax electronically.