After you file

If you first make a copy of your file, name it something like 1040 Final or Filed or Amended, then you can test in one of them and see how it works and what happens if you click on Amend.  You can alway make another copy to amend or play in.  Just make sure to name them to know what they are like Amend1 or Amend2 and to keep the real original file saved intact.

 

Also before you amend you should check the filing status in your real return.  First you need to update your return with the filing status so it knows it was filed and accepted.  For the Desktop program you have to check the filing status inside the program.

 

Open your return and go up to menu item

File > Electronic Filing > Check Electronic Filing Status

Then save your return and close and reopen it.  

 

How to amend a 2019 Desktop return

https://ttlc.intuit.com/community/tax-topics/help/how-do-i-amend-my-2019-return-in-the-turbotax-cd-d...

 

You can find Amend under

Federal Taxes or Personal (for Home & Business)

Other Tax Situations