The card on file will be charged on the first of each new month to cover any outstanding balances that were not paid the previous month.
For example, if an account has a $50 threshold* and their spend by January 31st is $45, their threshold is not met and they are not charged that month. The account is then charged $45 on February 1st to cover the uncharged balance from January.
How do I know if I received a monthly charge?
Your Billing & Payments page will indicate whether a charge was a threshold or monthly payment, specifically under the Payment Type column. For more information on threshold billing, please see Threshold Billing.
Why did I receive a monthly charge after I paused my campaigns?
Monthly charges account for the previous month's outstanding balances.
You can verify this by viewing your account's "All-Time" spend on the Manage Ads dashboard and compare it to the "All-Time" charges on your Billing History page. Assuming your "Current Balance" is $0, the two numbers should match (All-Time Spend = Current Balance + All-Time charges).
*Thresholds are equivalent to USD $25, $50, $250, $500, and $750. Thresholds are subject to change based on currency exchange rates.