  We study the power corrections to Transverse Momentum Distributions (TMDs) by
analyzing renormalon divergences of the perturbative series. The renomalon
divergences arise independently in two constituents of TMDs: the rapidity
evolution kernel and the small-b matching coefficient. The renormalon
contributions have a non-trivial dependence on the Bjorken variable and the
transverse distance. We discuss the consistency requirements for power
corrections for TMDs and suggest inputs for the TMD phenomenology in accordance
with this study. Both unpolarized quark TMD parton distribution function and
fragmentation function are considered.
