The most recent change was:

Champions will now use the higher of their bonus attack damage or 40% of their ability power when dealing bonus damage to towers

Now how it was BEFORE is that you hit turrets for your AD, minus its armor ofcourse, correct?
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Thank you,
-ErdoS

Don't bring up anything from the test realm to GD. (Original post had PTR information in it, which I edited out)

Before, you dealt damage to turrets with your total physical damage + .4*AP (then affected by armor).

Now it's base damage + [+Dmg] or [.4*AP] (then affected by armor)

Looks like PHREAK JUST GOT SERVED

way to go phreak, keep proving that riot is comprised of reres