  The Standard Model (SM) predicts a branching ratio of the Higgs boson
decaying to invisible particles of $\mathcal{O}$(0.001), though current
measurements have only set upper limits on this value. The small SM-allowed
rate can be enhanced if the Higgs boson decays into new particles such as dark
matter. Upper limits have been placed on BR(H$\rightarrow$inv.) by ATLAS and
CMS at $\mathcal{O}$(0.1), but the hadron environment limits precision. The ILC
`Higgs factory' will provide unprecedented precision of this electroweak
measurement. Studies of the search for H$\rightarrow$invisible processes in
simulation are presented with SiD, a detector concept designed for the ILC.
Preliminary results for expected sensitivity are provided, as well as studies
considering potential systematics limitations.
