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If the post got negative votes and is deleted, does that negative vote after deletion count in the score of tags.(Reputation lost is credited back but what about the score of the tags involved in them) .
The scores(negative or positive) on deleted answers will not be calculated on tag scores.
The tag scores are calculated on daily basis, so the tag score will be updated within a day of deletion.
It's not. It's as if the answer never existed in the first place, so none of the votes on it count at all.