To pay online click here. To pay by mail PA DOR says:
Mail PA-40ES (I), Declaration of Estimated Tax coupon to the department along with their check for the estimated tax amount. Taxpayers should write “2021 Estimated Tax Payment” and the last four digits of the primary taxpayer’s SSN on the memo line of their check.
See Estimated Tax Payments - PA Department of Revenue
I would recommend paying online. To calculate the tax liability, estimate your income and multiply by 3.07%. Divide by 4 to make equal payments.
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