You would have to print it out before you change it and after to compare what changed. Interest might change some extra investment tax like the NIT and Medicare tax on high income. Did you subtract the interest after subtracting the W2 income so 2,000 was subtracted or do them separately like put back the W2 1,000 then subtract the interest 1,000? Because if the W2 was still less then reducing the CD interest would be cumulative.
