Mine is about 0.5%.

Complaining to Google would give you some default answers but if you make enough money you could contact adsense directly.

You have to look at your traffic sources, use something like Google analytics. If you connect Adsense with Analytics you can see which provider generates clicks.

Having spent a inordinate amount of time studying bot traffic, I have come to the conclusion that Google (and the other ad networks for that matter) are probably still paying us for a good amount of click fraud. The people who say half the internet traffic in the world isn't human aren't far off.

Less than 1%. I doubt you'll get far complaining to Google, and I don't think that they are stealing from us. Click fraud is a huge problem.

We often see a few dollars deducted from our monthly total for "invalid traffic." That amount was up noticeably in December: 5.6 percent of the total, compared to the usual 1.5 percent or so.

It's worth noting that "invalid traffic" encompasses more than "invalid clicks," especially on sites like ours that get more revenue from CPM ads than from CPC ads.

Mine is usually about a daysworth, ~3%, 20% seems huge.

@RedBar, coming back to our previous discussion about comparing numbers, even 20c can be 20% of something.
@Alexandermichael, are these 20% a significant loss or are we in single to double digits? If the first, I'd investigate further.

My clawback has ranged from under 1% to almost 5%. If you're losing 20% then I'd take a good look at the quality of your traffic.

I did forget to mention in this post that this is through YouTube earnings not on a website of mine. I realize many of you are not as familiar with the YouTube ups and downs. YouTube/AdSense clearly classifies my content as high quality by my watch time, high likes and interaction and how they will rank some of my instructional videos very high in search results plus a generally speaking high rpm. That's why it baffles me they would deduct that much traffic for being invalid or whatever. Maybe it's the norm for the YouTube platform though? This 20% equates to about $100 loss currently

The usual small percent.

Usually, I see something below 0.5%. Interestingly, it was about 1.5% in December.

My niches have a notoriously high amount of click fraud but I still get usually below 1%.

My niches have a notoriously high amount of click fraud but I still get usually below 1%.

I quoted here on a similar topic many months back that I had extensive discussions over several months with Google AdSense. As to how and why the prevalence of invalid clicks. AdSense understandably keep things close to their chest.

Click fraud? Invalid clicks?

Over time I have become almost convinced there is a thus far a hidden third option. Misleading AdSense advertisements, perhaps even "bait and switch" advertisements. I've seen a few over time, they may well be a minuscule in number, then again maybe not. As a user, I couldn't back out fast enough.

How is that recorded in the publisher's statistics and earnings? How prevalent?

Are they a factor? Something I can neither prove nor disprove.