I set a daily limit, but see that I've been charged more (as much as 18% more, although it varies) each day - that can't all be taxes, why am I getting charged more?
Re: Daily Limits
This is typical behavior. If you take a look here: http://support.google.com/adwords/bin/answer.py?hl=en&answer=6312 you'll note this information:
"To help make sure that your ad can run a little more on days when it's very popular, your daily budget is used like an average: on any single day, you can receive up to 20% more in costs than your daily budget, but other days will be capped at a lower amount to make up for it. This is called overdelivery. "
If the overages are too much for you, you could adjust your budget to what makes sense for you. Google may overdeliver on certain days but will attempt to make up the difference on slower days.
Hope this helps!
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Welcome to the forum
There are many factors which could contribute to higher spending on some days of the week. Please the Google explanation on that below quote from this reference:
AdWords helps you maximize your return on investment (ROI) by looking out for days when search traffic is higher, and then showing your ads more often on those days. When this happens, your total daily cost could be up to 20% more than your usual daily budget – but AdWords prevents your campaign from overspending for the month as a whole based on a monthly charging limit.
Hope that helps somewhere in understanding!
Re: Daily Limits[ Edited ]
August 2012 - last edited August 2012
Just thought this might help also. In addition to what Pankaj1782 posted, Google will try to ensure that you are getting the most from your campaign and that your ads are displaying to the highest potential (i.e. in line with your daily budget)
For example, if your daily budget is US$10 per day, and you've accumulated US$15 in costs on a given day, you'll only be charged US$12. AdWords uses a monthly charging limit to prevent you from accidentally getting overcharged.
More usefu informationl can be found here.
Hope this helps