I already filed and I got a 1099 INT from a savings account I made 49 in interest. I closed those bank accounts and forgot about it. Turbo Tax won’t let me amend ?

You cannot amend until your original return has been fully processed by the IRS.  The form 1040X that you will need will not be available until late February.

$49   OR...49 cents???

You don't amend for 49Cents, because that will round down to zero and not be used anyhow.

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Yeah, usually banks don't issue a 1099-INT for less than $10, but I've seen that a very few do so.

I should’ve put a unit, I meant 49 dollars. My apologies.

Yes, you will need to amend, but do not amend until your original return has been fully processed to avoid unnecessary delays.     

You can amend using TurboTax Online. Do not use the Amend using TurboTax Online button. Instead do this:

How to amend my return?