no, it affects net profit, but the actual profit doesn't change. if a corp makes, say 1B a month, 75% tax will drop the net profit to 0.25B, and pay 0.75 to the country. the lower net profit, will mean a lower market value, and higher (worse) PE, but the actual profit of the corp will stay 1B.
so essentially, tax does not effect how much money the corp is bringing in, it only effects the value of the corp. and in the case of private and public corps, it effects who gets the profit, the country or the owning CEO/share holders.