  We consider the scalar form factor in $\tau \to K\pi \nu_\tau$ decays. It
receives contributions both from the scalar resonance $K_0^*(1430)$ and from
the scalar projection of off-shell vector resonances. We construct a model for
the hadronic current which includes the vector resonances $K^*(892)$ and
$K^*(1410)$ and the scalar resonance $K_0^*(1430)$. The parameters of the model
are fixed by matching to the $O(p^4)$ predictions of chiral perturbation
theory. Suitable angular correlations of the $K\pi$ system allow for a model
independent separation of the vector and scalar form factor. Numerical results
for the relevant structure functions are presented.
