USA Changing Ownership of SMLLC from Natural Person to Corporation

[penelope]

I have a single-member LLC (TSC LLC) owned soley by myself as a natural person.
I want to form a Wyoming Corporation, also owned soley by myself, and transfer ownership of TSC LLC to the Corporation.

So instead of TSC being owned by myself, it would be owned soley by a Wyoming Corporation which I own.

Question:

Do I need to inform the IRS of this change now, or do I wait till the related tax returns are filed? (In this case, Schedule C and 1120).