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We provide an overview of the current state of lattice calculationsconcerning isospin-breaking corrections in weak decays, focusing in particularon leptonic decays of light pseudoscalar mesons. We examine the two currentlyexisting calculations, placing a particular emphasis on the role ofelectromagnetic finite-volume corrections. Given the large systematicuncertainty associated with such corrections, we propose a novel method toimprove the finite-volume scaling of leptonic decay rates and other hadronicobservables, like hadron masses and the hadronic vacuum polarizationcontribution to the muon $g{-}2$. We introduce a new prescription for the QEDaction, referred to as QED$_\mathrm{r}$, which effectively removesfinite-volume corrections at $\mathcal{O}(1/L^3)$ and consequently shifts thesystematic uncertainty to a higher order. The specifics of this action, thepractical implementation of the infrared improvement, and the ongoing numericaltests are also discussed.

Isospin-breaking corrections to weak decays: the current status and a new infrared improvement