I am having a similar issue with Treasury bonds purchased at a discount. The accrued market discount should be treated as Box 3 interest for Federal and Oregon taxation, but my broker reports it on a 1099-B instead of a 1099-INT and I can't figure out how to force Turbo tax to accept that as a code 315 subtraction on the ASC. From the course of this thread over the last 5 years, I don't have much hope for a solution that allows me to e-file the Oregon taxes.
