I believe you are referring to the due date of an extension on filing tax returns for 2022. If you filed an extension by the original due date, you have until the expiration of the extension to file your tax return, which will allow you to avoid a penalty for late filing of the tax return. However, the tax was due by the original date of the tax return, so if you paid the tax after April 15, 2023 you will incur a penalty for late payment of tax, not late filing of the tax return though.
Estimated taxes for 2023 were due quarterly, so if you waited until until October to pay them, you will likely be penalized for late payment of taxes for that as well.
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