Facebook Ads Manager vs Google Analytics Cost Data

Facebook autocorrects cost, impression, and click metrics over 24 – 48 hours.

These changes are usually minimal but can be why you would see some small differences when looking at data in Google Analytics with a date range through yesterday.

Our system imports cost data daily with a lookback window of 7 days to ensure that cost, impression, and click data is up to date and reflects any adjustments Facebook has made.
Note: If there is a large difference between cost, impression and click data that you are seeing in Google Analytics compared to the Facebook Ads Manager your Cost Data Set might not be configured properly.