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Why am I being charged for more than my daily budget on some days?

User traffic fluctuates from day to day. To make up for these fluctuations and to ensure that your campaigns reach their potential, Google may allow up to 20% more clicks (or impressions for site-targeted campaigns) in one day than your daily budget specifies. We call this overdelivery.

However, our system makes sure that in a given billing period, you're never charged more than the number of days in that month multiplied by your daily budget. That amount equals your monthly budget.

For instance, if you budget US$100 per day in a 30-day month, you may receive more than US$100 in clicks on a given day, but the maximum you would pay for that month is US$3,000.

If Google overdelivers your ads, resulting in more clicks than your monthly budget allows, you'll receive a credit to your account. Credits for clicks in excess of your monthly budget are listed on your Advertising costs page (accessible from your Billing Summary) as an Overdelivery credit.



 
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