After you file

To answer your questions in order:

1. It depends. Before you decide, please contact our Audit Support group here: Get help from TurboTax Support
   1. You could still file the 2014 correction yourself.
      1. You will need to purchase the 2014 TurboTax program from Amazon to access the 2014 Form 1040A and file an amended return. Here are the 2014 Form 1040A Instructions, 
      2. Get a copy of the IRS notice. Often times, responding to the notice as directed can resolve the issue without being required to go through amending the whole return,
   2. It may be useful to consult a tax attorney. 
2. Not necessarily. It would depend on the IRS office and the IRS agent involved in your case.
3. Regarding how long it will take to get your 2019 refund, in general, I would expect a delay for processing of 4-6 weeks once any issues were resolved.