Electric field dependent g factors of ThF${}^{+}$

The g-factors for $J=1$, $F=3\mathrm{/}2$, $\mathrm{\mid }{M}_F\mathrm{\mid }=3\mathrm{/}2$ hyperfine levels of the ground electronic state ${}^3{\mathrm{\Delta }}_1$ of the ${}^{232}$ThF${}^{+}$ cation are calculated as functions of the external electric field. These calculations are necessary for the analysis of systematic effects in the experiment aimed at searching for the electron electric dipole moment.