It depends. You can add this amount to see if your tax amount changes or your refund changes. If nothing changes, keep it in your file should you ever need it. If it does change you may want to amend your tax return. Also be sure to check the state difference.
The amended form will be ready later in the year. By using the link, Tax Forms Availability, you can continue to check to see when it's ready. If you decide you do need to amend use the steps in the link below.
Go back into your tax return and add it to see if your refund or tax due changes. You might have to click on Add a State to get back in. Then take it out so your return is still the way you filed it originally. If it changed your return you will need to file an amended return to add it. If it doesn't affect your return then just keep the 1099 INT with your tax papers .
Open the return by selecting "Add a state" to fool the software.
Print a copy "just in case".
Add the 1099-INT
Check the difference (if any) on the corrected mock return.