If really is a 50/50 gamble. Normally the IRS states that you should wait until your original return is fully processed (receive the refund or payment went through for taxes owed) before you amend your return. The problem you have is that you would owe on the amended return & taxes owed must be paid by April 15, 2019 to avoid interest & a penalty.
In reality you should wait until you amend your return because the IRS may catch the error. If they don't catch the error there will be a penalty & interest on the $300. The following has information on what the penalty & interest would be.
https://www.irs.gov/businesses/small-businesses-self-employed/understanding-penalties-and-interest
The other thing you can do is call the IRS & see if they have processed your return, they can tell you if they caught the 1099-INT
the following will help you get to a real person with the IRS:
The IRS telephone number is 1-800-829-1040, and they are available from 7 a.m. – 7 p.m. Monday thru Friday. The best time to call is early in the morning.
- The first question the automated system will ask you is to choose your language.
- Once you’ve set your language, do NOT choose Option 1 (regarding refund info). Choose option 2 for “Personal Income Tax” instead.
- Next, press 1 for “form, tax history, or payment”.
- Next, press 3 “for all other questions.”
-Next, press 2 “for all other questions.”
- When the system asks you to enter your SSN or EIN to access your account information, do NOT enter anything.
-After it asks twice, you will be prompted with another menu.
-Finally, press 2 for personal or individual tax questions. The system should then transfer you to an agent.
