Do u auto transfer savings on payday or just save whatever leftover?

Tbh i always hear people say pay yourself first but i still kinda just see whats left at the end of the month then shove it into savings

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curious what actually works for u guys. do u set an auto transfer the moment salary hits, or more of a flexible leftover vibe? and if u auto, roughly what % do u aim for without being too strict

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trying to figure out if im just undisciplined or if leftover method is fine as long as something goes in