If you have taxes owed, filed for an extension and do not file your tax return on or before October 15, 2024 you will have a failure to file penalty and a failure to pay penalty.
Go to this IRS website for the failure to file penalty - https://www.irs.gov/payments/failure-to-file-penalty
Go to this IRS website for the failure to pay penalty - https://www.irs.gov/payments/failure-to-pay-penalty
If you are filing the 2023 tax return with a tax refund there are no penalties for filing the 2023 tax return after the due date.
