Thanks, Rachel. This is how I'd gone about it, but what happens is that the taxable interest from the ordinary savings account is for some reason being combined with the nontaxable T bond interest on the 502 SU. In other words, rather than just the T bond interest being ported over to the 502 SU, Turbotax is bringing the taxable and nontaxable INT 1099s onto the 502 SU, so both are being treated as tax deductible, and there seems to be no way to fix it.
