There is a note under interest adjustment on the 1099-Int link that says "Enter any adjustment to your xxx interest as a positive number. If you need to add to the interest reported on this 1099-INT, enter the amount as a negative number." The amount in question was interest that was paid to the previous owner of the secondary bond before I bought it; and was reported on my 1099-B as "Capital Gains Accrued Market Discount". When I entered that amount as a positive number it correctly deducted that amount from my Federal tax, but on the TC-40 it simply isn't showing up as a credit against the income that bond earned.
