TurboTax never calculates or adds late penalties or interest to the tax you owe. That is done by the IRS or your state, and when it happens, they bill you for it later after they have received your tax return and your payment of the amount as shown on your tax form. That being said, there are certain locations in CA that have an extra extension for federal returns, courtesy of the IRS--- so as long as you file (and pay) by your new deadline you are fine. However, you are going to need to file by mail.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
