arXiv:2611.09571v1 Announce Type: new Abstract: We establish rigorous local-error bounds for the entire family of symmetric Zassenhaus splittings for possibly unbounded operators, under explicit assumptions on commutator bounds, regularity-preserving flows, and conjugation identities. Truncated symmetric Baker-Campbell-Hausdorff expansions yield an explicit coefficient formula for the Zassenhaus exponents and identify vanishing commutator expressions. In order to extend these cancellations to the realm of unbounded operators, we prove a general theorem on finite expansions of multiple operator conjugations with controlled integral remainders. For splittings of order 2n, our argument gives the sufficient commutator-length bound 4n-1, revealing regularity requirements that are not apparent from the formal order calculation. Using the Schr\"odinger equation with a quadratic potential as an example, we show that the order-dependent regularity requirements can reduce to one fixed weighted Sobolev space for all splitting orders.