To pay the IRS electronically go to:

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https://directpay.irs.gov/directpay/payment?execution=e2s1

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To pay the California FTB electronically go to:

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https://webapp.ftb.ca.gov/webpay/login/login?Submit=Use+Web+Pay+personal

 

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Below are detailed instructions on how to pay electronically (detailed instructions not available on mobile device).

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To pay the IRS electronically go to:

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https://directpay.irs.gov/directpay/payment?execution=e2s1

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1.  Select Estimated Tax

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2.  Apply payment to 1040ES

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3.  Select the tax year that you would like to pay