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When looking for heavy ($\mathcal{O}$(few TeV)) New Physics, the mostefficient way to benefit from both high and low-energy measurementssimultaneously is the use of the Standard Model Effective Field Theory (SMEFT).In this talk I highlight the importance of semileptonic $\tau$ decays incomplementing, in this respect, the traditional low-energy precisionobservables and high-energy measurements. This is yet another reason forconsidering hadronic tau decays as golden channels at Belle-II beyond theunquestionable interest of the CP violation anomaly in $\tau\to K_S\pi\nu_\tau$decays, that I also discuss within the effective theory. A couple of newresults for $\tau^-\to K^-\nu_\tau$ decays are also included.

Semileptonic $\tau$ decays: powerful probes of non-standard charged current weak interactions