I already filed my federal and state taxes for 2019. I just found a 1098-E doc I believe would change my return by a significant amount. Can I edit my filed return?

[xmasbaby0]

You cannot change or add anything on the return that you just e-filed, nor can you stop it.  It is too late, just like when you put an envelope in a US mailbox on the corner.

If you left out a W-2, or a dependent, or a 1099 etc…DO NOT change your return while it is pending.  The changes will go nowhere.

Now you have to wait until the IRS either rejects or accepts your return.  If your return is rejected, you will be able to go into your account and make the necessary changes to your tax return and re-submit your return.

 If the IRS accepts your return, however, then you have to wait longer until it has been fully processed and you have received your refund.  THEN you can prepare an amended tax return and mail it in. You have to be able to work from that return exactly the way it was when it was e-filed originally.  You will need to use a form called a 1040X. You cannot e-file an amended return.  They have to be mailed, and it takes about 4 months for the IRS to process an amended return.

 Meanwhile, DO NOT go in and start changing anything on your return in the system, or you will make a mess for yourself.  Sit tight and wait until you see what the IRS does with the return you just e-filed

[JohnW222]

Everything that xmasbaby0 says above is correct, so please heed that advice.

All I'd add is that, before amending, you might look into whether adding Form 1098-E will actually provide you with a tax benefit or not, just to see if it's worth your effort.

Please see the IRS's Topic No. 456 Student Loan Interest Deduction for more information, and Chapter 4 -- Student Loan Interest Deduction in IRS Publication 970, Tax Benefits for Education for computation information.