If it's a 1099-INT from the IRS, it is entered in the same place as other Interest 1099-INT forms are entered. If I misunderstood your question, please let me know in the comment section.
From SuperUser VolvoGirl: If you did an amended return and had a refund the IRS would pay you interest on it. It would be included on the check from the IRS. It would not be a separate check. I amended 3 years of returns in 2017 and each refund had interest on it I had to enter on my tax return.
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