"What do you mean by change the "registration"? If you mean change the tax ID on the assets, that is possible."
It IS possible, similar to the way that it is possible to run a marathon! In over 15 hours on the phone, across half a dozen calls and 12 months, I could not get Vanguard to change the Tax ID's on two living trusts I opened for my nieces. Their ONLY solution: Close the accounts and open new ones. That's what I ended up doing...at Fidelity!
In a similar vein, I have found it impossible to get Vanguard or 2 credit unions to change the Tax ID on a 1099 (DIV and INT). They simply say it is impossible. Then why is there a checkbox on the Form that says "corrected"? And why is there a section in the IRS document for 1099 creators that describes how (and when and why) to correct Tax ID's? Furthermore, the IRS says, corrections of tax ID's are required no later than in the year following the year in which the 1099 creator was informed of an error (they can get a get an exception for the first year), at which point they start arguing over the definition of an error, and whose fault it was.
When there is a mismatch between the EIN of a Grantor Trust, and the SSN of the Grantor, it is best to do as suggested: Use TT for Business (and estates and trusts) to file a 1041 for the Trust, and generate a letter to the Grantor covering the Trust income that should be included on the Grantor's 1040.
