Quick answer: they don't have to justify anything.

It seems like I lose about $40+ a day on the average from "corrections."

That is one way of framing it. But you see from a different perspective:

It seems like about $40+ worth of extra clicks are wrongfully attributed to my account a day, but thankfully it is always readjusted to the correct amount.

Note that the first words at the top of the Adsense Dashboard state explicitly "Estimated Earnings". Estimated means, not actual and subject to change.

Finally, what @eek said.

Other answer: Because they can ... and don't provide a detailed explanation, only a general declaration.

ON the other hand, this makes webmasters crazy ... particularly those that check their earning hour on hour instead of waiting for week on week...

Clawbacks have been around for YEARS ... so nothing new.

The monthly claw backs dropped a while ago but than the daily claw backs raised. And I'm also using Google Ads as an advertiser, the funniest part of all as a publisher they use a claw back but as a advertiser I never got a refund at the opposite of all those claw backs.

Sometimes I get an "extra" rather than a deduction.

OK it's a cup of coffee and a sandwich, Better than a deduction.

Hello,

Since I a blocking all requests from IP range which belongs to web host, I have no more daily adjustments, and at the end of the month, the "clawback" is less than 0.5%. I also used to see daily adjustments of several dollars, and a claw back in the 5-10% range.

For the remaining clawback at the end of the month, it's so low, that i don't find it suspect, it might be advertisers who didn't pay, or currency exchange adjustment, etc...

Now, about advertisers never getting refund, it's possible that Adsense in not charging advertisers in real time, and doing so only after they had "verified" an action was legitimate.

Also, keep in mind that daily stats at Adsense are "estimation" of earning, and like all estimations there are fluctuations.

I'm mixed about it. I don't like that I can't see the data behind the curtain. I can't know why a click was deemed invalid, or where the money is or isn't going, and that just leaves me wondering if it's a me problem, or a user problem, or an advertiser problem. I just don't know.

But at the same time, if that's the game we're going to play, I prefer real-time clawbacks to end-of-the-month surprises.

What bothers me more is when I see in my analytics that someone has clicked an ad multiple times, but for whatever reason Adsense doesn't real-time filter those clicks, instead waiting until the end of the month. This has only happened to me once or twice, but I sure didn't like it much.

I wish I had the time to sit around and spectate my AdSense estimated earnings all day to see when it was reporting inflated numbers. I'm pretty sure that if I actually had that kind of spare time I would still find something more constructive to do with it.

Edit: Meh.

@BoredMeteor I just wish there was more transparency. Even at the end of the month my clawbacks tend to be a fairly high percentage around 5-7%...and my ad placements are very traditional. I don’t use text links ads either. I also spend about $300 a month on Google Ads and never see real time changes in my favor there.

@NickMNS, yeah, those 3 minutes a day sure make a difference.