I forgot to add one of my Student Loans Interest paid, what do I do?

If you have already entered $2500 of interest, you can't add any more. How much have you already entered? Also, if you have not taxable income from your current adjustments and deductions, you won't get any additional tax break from entering more interest. You are not required to enter student loan interest paid on your tax return.

I put 1173.84 on my return. I forgot to add 1636.80 for my 2nd loan. Would it do me any good to Amend?

It might. Look at your tax return and see if you have taxable income after your deductions and exemptions have been subtracted. If you do, the additional interest up to $2500 total would further reduce your taxable income and thus your tax liability.

If you have e-filed, wait until your return is accepted or rejected by the IRS.    

If your return is rejected, add your student loan interest (along with anything else that needs to be corrected for e-filing) and then re-submit your return.

If your return has been accepted or you have paper-filed your return, you cannot change the information.  Instead, you have to amend a return.  

If your original return generates a refund, you should wait until your original refund arrives before you file your amendment Form 1040-X. You can cash your check, but you still should wait until your current tax return is resolved.

For more information on requirements, see  https://www.irs.gov/taxtopics/tc456.html

To amend, click here:

https://ttlc.intuit.com/replies/3288565

[Edited 1/28/2017]