Hi,
Here is a TurboTax article that explains your question about being to file an extension after 4/15/24, this cannot be done for your 2023 federal personal taxes past midnight on 4/15/24: TurboTax Can I file an extension after April 15, 2024?
However, there is no penalty if you are getting a tax refund from the IRS.
Here is a TurboTax article about IRS penalties:
IRS Penalties
