Can i add documents after filing? like 1040?

[CatinaT1]

If you filed, it is like dropping it into a mailbox - you cannot get it back. 

You'll have to wait until your return is either accepted or rejected. 

• If rejected, you can make any necessary changes. 

• If accepted, you'll need to amend your return.   

• To avoid unnecessary delays, do not amend until your original return has been fully processed.   

• You can e-file your 2020 amended federal tax return, but most states require amendments to be printed and filed by mail. 

• Allow 16 weeks for processing. 

See this TurboTax FAQ for help with amending. 

You can check the status of your amended return here, but allow 3 weeks after filing for it to show up. 

[xmasbaby0]

If you filed a tax return----a Form 1040 is the tax return that you filed.   You do not "add" a 1040.

A 1040 is the tax return form you prepare here to send to the IRS.   If you start entering data in this software you are preparing a Form 1040.   Please look at it so you will know what you are sending to the IRS:

PREVIEW 1040

https://ttlc.intuit.com/questions/1901539-how-do-i-preview-my-turbotax-online-return-before-filing

Click on Tax Tools on the left side of the screen. Click on Tools. Click on View Tax Summary. Click on Preview my 1040 on the left side of the screen.