If the income you accidently didn't report is less than 25% of the gross income reported, after three years the IRS cannot assess more tax. If it was more than 25% then they have 6 years.
You can file an amended return going as far back as you want, but you can't get a refund after 3 years (or 2 from payment if that is later). TT may only support going back 3 years, but that is TT not the IRS.
If the 1099-INT amounts are small, I think most people would just ignore it and get it right in the future. Don't know what "small" is. $10 certainly. $1000 no.
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