TurboTax offers 100% accuracy guarantee with all federal and state updates to their customers.
Fees are charged when the product is used to file federal and state return(s) (if applicable). Some people prefer or are required to mail in their tax returns and are charged even though e-filing was not utilized.
Filing an extension can be filed using Easy Extension for free. Get started here.
There is a separate extension required for some states. See below for the list to see if this applies to your situation.
TurboTax offers qualifying customers the Free Edition or IRS Free File delivered by TurboTax. There are different eligibility requirements for each.
For more highly compensated individuals and/or for those filers with more complexity, there are fees charged for this self-prepared service.
For more information, see:
How do I file an IRS extension (Form 4868) in TurboTax Online?
Can IRS extensions be e-filed?
Do I need to file an extension for my personal state taxes?
How do I review my fees in TurboTax Online?
What can I do to reduce my fees?