Measurements of the CP structure of the Higgs boson coupling to tau leptons and top quarks using data collected at the CMS experiment during 2016, 2017 and 2018 are presented. The dataset corresponds to a total integrated luminosity of 137 fb-1 at a centre-of-mass energy of 13 TeV. For these measurements, events with two tau-leptons in the final state are selected. The effective CP mixing angle for the Higgs boson to top quark coupling is measured to be -5+36-37 degrees. The measurement of the CP mixing angle in the tau decays reports a value of 4+-17 degrees, which is the first direct measurement of CP properties of the Higgs boson coupling to a pair of tau-leptons. Both results are compatible with standard model expectations.