After you file


@ Fogdog wrote:

But when will it be available? That’s the question. 


The only thing anyone can go by is what is showing in the table below, which is that the Form 1040X is supposed to become available March 4.   But the update usually occurs overnight Wednesday into the wee hours of Thursday AM, so it may actually be March 5.   Rarely, a form can be released earlier than shown in the table.    No one can know for sure--only an expected date.  It's been moved back a couple of times already.

 

TurboTax Form Availability Tool

 

In the meantime, do not make any changes in your original return. Also, if you are due a Federal refund, it's recommended to wait on the refund to arrive before amending. Or if you owed taxes due, to wait until the return processes.