An individual terminates employment and rolls dollars out of employer's plan, that includes both pre and post tax money, into an IRA. This individual then takes a new job and rolls just the pre-tax dollars into the new employer's plan. Leaving just an IRA with after tax money in it. Can this be converted into a Roth without any taxable income (assuming it has not changed in value) (and he is otherwise eligible for a conversion)?

Would it matter whether or not the new employer's plan accepted post tax contributions? (I think this has to be trustee to trustee.)

Thank you.

Your idea works, and it's a great tax free way to get into a Roth. Employer plans cannot accept after tax rollovers from an IRA.