Charges and your daily budget

Starting October 4, 2017, campaigns will be able to spend up to twice the average daily budget to help you reach your advertising goals, like clicks and conversions.

On days with high traffic, your costs could be up to 2 times your daily budget. This spending is balanced by days when your spend is below your daily budget. However, for campaigns where you pay for conversions, your daily spend may exceed your average daily budget by more than 2 times.

Keep in mind, you won’t be charged more than your monthly charging limit: the average number of days in a month (30.4) multiplied by your average daily budget.

Internet traffic is like an ocean. Some days, there will be small waves. Other days, there will be great big ones. So, if your ads don't show up much because of low traffic, then we'll make up for that by showing them more when traffic's higher.

That's why we allow up to 2 times the clicks in a day than your daily budget allows for campaigns that aren't paying for conversions. This is called overdelivery.  And it's a good thing: if we end up showing your ad too much -- to the point where you accrue more costs than your daily budget allows for over a billing cycle -- then we'll give you a credit for those extra costs.

Overdelivery and your daily budget

As we mentioned, you might see that your advertising costs each day are a little higher or lower than what you set for your daily budget. If you do, don't worry -- over a month-long billing cycle, you won't be charged more than your daily budget would've allowed for over 30.4 days.

Let's explain that number.

Basically, 30.4 is the average number of days in a month (365 days in a year / 12 months = 30.417). Google multiplies your daily budget by this number so we know what your budget should be over the course of a month.


Let's say you set your budget at $5 a day and your billing cycle is 30 days. Over the course of the month, you notice that your charges vary. Some days you're charged $2, on others you're charged $10. But at the end of the month, your charges won't exceed $152 (that's 30.4 multiplied by your $5 budget). So even though your campaign costs tipped above and fell below your $5 budget from day to day, at the end of the month, you're still charged no more than what you budgeted.

The waves of Internet traffic might make your daily costs go up and down. But at the end of the month, despite those unpredictable waves, you'll find your costs at right where you expected them to be.

Check for overdelivery

Sometimes we deliver over your monthly budget. In those cases, we'll credit the overdelivery cost back. If you'd like to see whether we've given you overdelivery credits, follow these steps:

Choose the AdWords experience you're using. Learn more

  1. Sign in to your AdWords account.
  2. Click the Reports tab at the top of your account.
  3. Click the Pre-defined reports drop-down menu at the top left of your screen.
  4. From the drop-down, select Basic, then Overdelivery.

To calculate overdelivery, subtract “Billed cost” from “Served cost.” To perform these calculations in bulk, click the download icon in the top right of the report and save as a .csv file.

By default, the data is displayed daily and sorted by served cost. If you wish to see for a certain date range, remove the “Day” filter and and set date range in the upper left of the table.

Starting on September 30, 2017, the campaign activity link found on your Transactions pages will be disabled. On that day you’ll be able to find served and billed costs in the reports section of your account, which will allow you to check for overdelivery.

IMPORTANT: Once the new reporting feature is available, reports will only show data as far back as September 2015. If you would like to retain access to older campaign activity, please use the print function to save this information now. 

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Common questions about overdelivery

Will overdelivery of my daily budget increase the maximum that I can be charged for the month?

No. The monthly charging limit remains unchanged. Even though you may see higher spend on some days, this overdelivery is balanced by days of the month during which your spend is below your average daily budget.

When exactly will my spend exceed my daily budget?

There are no changes to how spend is prioritized throughout the month. AdWords will continue to optimize your spend based on daily fluctuations in traffic, what you've spent on previous days of the month, and other factors.

In general, spend may exceed your average daily budget on days that are more likely to drive clicks and conversions.

If my campaigns aren’t limited by budget, will overdelivery affect my spend?

If your campaign isn’t limited by budget, your monthly spend will remain the same. There are no changes to how campaigns that aren’t limited by budget work.

If your campaigns are limited by budget for one or more days in the month, then you’ll see some variation in your daily spend. However, you’ll never be charged more than the monthly charging limit. Flexibility in your budget helps balance days with low traffic by increasing spend on days that are likely to drive more clicks and conversions.

Learn more about what it means to be limited by budget.

Is it possible to spend my entire budget in the first half of the month?

It’s unlikely your spend will be twice your daily budget for multiple days in a row. For “Standard” ad delivery, Google’s budgeting algorithm optimizes delivery based on your past spending within the billing cycle. This helps keep your ads delivering throughout the month. Learn more about ad delivery.

What happens if I adjust my daily budget during the month?

There’s no change to how adjusting your budget impacts what you’ll be charged for the rest of the month. As before, when you change your budget, your spend for the rest of the month won’t exceed your new average daily budget multiplied by the remaining days in the month.

For example, let’s say you set an average daily budget of $10 on the first day of September, and you change it to $20 on day 16. For the first 15 days of the month, your spend will be capped by your monthly charging limit of $10 * 30 (number of days in September). After changing your average daily budget to $20, your spend for the rest of the month will be $20 multiplied by the remaining 15 days.

For the first 15 days of the month, your spend may be more than half your monthly charging limit. This is because spend may exceed daily budget on some of those days. However, as soon as you change your budget, you won’t be charged more than $20 multiplied by the remaining days in the month. If you already had ad spend on September 16 before you changed your budget, your total spend from September 16-30 could be slightly higher than $300.

Learn more about why costs might exceed your average daily budget.

Is it possible to opt-out of overdelivery?

There’s no opt-out. Overdelivery is designed to help you optimize spend for days of the month when you’re more likely to get clicks and conversions.

Can I set a cap on my daily spend?

No. You won’t be able to place a cap on your daily spend using your campaign’s average daily budget.

How does overdelivery work if I’ve chosen ”Accelerated” ad delivery?

There are no changes to how “Accelerated” ad delivery works. “Accelerated” ad delivery spends your daily budget faster. As such, your spend will be spread less evenly throughout the day, and overdelivery is more likely. It’s recommend to use "Standard" delivery if you’d like to ensure that your spend is spread evenly throughout the day.

Will I be able to set a monthly budget?

Currently, you can't set a monthly budget within AdWords. However, you can use your daily budget multiplied by the number of days in the month to determine what your monthly spend will be. Learn more about campaign budgets.

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