I just learned about this in another thread.http://www.bogleheads.org/wiki/Backdoor_Roth_IRAUnder "Caution":"If you have any other (non-Roth) IRAs, the taxable portion of any conversion you make is prorated over all your IRAs"Does anyone know if this applies to a SEP-IRA too?I have a SEP-IRA and a non-deductible IRA. It would be nice to convert the non-deductible IRA to a Roth, but not if the SEP is taken into account.Thanks.