If you got a 1099-INT it is probably interest that was credited after the inheritance was issued. If that's the case, it will be taxable.
Missing a document happens frequently, and there is no reason to panic.
If you don't file an amended return,
- the IRS may send you a Notice of Proposed Increase in Taxes.
- This may take several months to get to you.
- They may totally ignore it.
- They will calculate the tax due (plus interest and penalties) and you can send them a check (no amended return necessary).
If you choose to prepare an amended return you will have to wait until your originally filed return is fully processed and then amend your return to add the missing document.
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