  Measurements of the inclusive and differential fiducial cross sections of the
Higgs boson are presented, using the $\tau$ lepton decay channel. The
differential cross sections are measured as functions of the Higgs boson
transverse momentum, jet multiplicity, and transverse momentum of the leading
jet in the event if any. The analysis is performed using proton-proton data
collected with the CMS detector at the LHC at a center-of-mass energy of 13 TeV
and corresponding to an integrated luminosity of 138 fb$^{-1}$. These are the
first differential measurements of the Higgs boson cross section in the final
state of two $\tau$ leptons. In final states with a large jet multiplicity or
with a Lorentz-boosted Higgs boson, these measurements constitute a significant
improvement over measurements performed in other final states.
