An extension gives you more time to file, not more time to pay. Interest and penalties still run from the original deadline on anything unpaid.
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Click MAKE A PAYMENT

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There will be three drop downs:
Field Choose Reason for Payment EXTENSION Apply Payment To 4868 Tax Period for Payment 2025 -
Click Continue
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The next screen is for identity verification only. Select 2024 and enter your information from your 2024 return
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Schedule the payment and enter the amount
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Finalize
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Save a copy of the confirmation for your records