The filing deadline is July 15, 2020--if you owe tax due you must pay by that deadline. E-filing will be open until October 15, 2020 for 2019 returns. After that, e-filing will close and 2019 returns will have to be submitted by mail.
If you are getting a refund, there is not a penalty for filing past the deadline. If you owe taxes, the interest/penalties will be calculated by the IRS based on how much you owe and when they receive your return and payment. The IRS will bill you for this; it will not be calculated by TurboTax.
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