As in description, I didn’t report the tuition deduction from my graduate assistantship. What should I do now

[Rachel_W]

You can Amend your return. <a rel="nofollow" target="_blank" href="https://ttlc.intuit.com/questions/1894381-how-to-amend-change-or-correct-a-return-you-already-filed?...>

[LinaJ2018]

If you are referring to the Tuition and Fee deductions, it is already expired by the end of 2017.  It is not available in the tax year of 2018.  However, you can still an education credit if you meet all the criteria.  If you have already filed, here are the steps:

Wait until your return is either rejected or approved.  

If it's rejected, you can return to the program to change the information while fixing the error. 

If your return is approved, you would need to amend if adding the information changes your original refund amount or tax due.  To amend, please click here 2018 Amend.  Follow the instructions in the program and it will tell you if the correction changes the result.  If you do need to amend, please wait until your return is fully processed and you have received your refund or your payment has cleared.