Google's "weird" billing is due to automatic charges triggered by hitting a payment threshold, not a consistent monthly budget, and a 30.4-day billing cycle. When you reach this set spending limit or reach the end of the 30.4-day cycle (whichever comes first), Google charges your payment method to zero out the balance and restart the cycle.
This allows Google to minimize non-payment risks while providing flexibility for advertisers.
Why You Get Charged at Different Times
- Payment Thresholds:
Instead of charging you per click, Google charges your account when your accumulated ad spend hits a predetermined payment threshold.
- Dynamic Thresholds:
Google may adjust these thresholds over time based on your account activity, leading to charges of different amounts.
- 30.4-Day Cycle:
If your spend doesn't reach the threshold within 30.4 days, Google will charge you on the first of the month or after the 30.4-day period, whichever occurs first.
- Budget vs. Threshold:
Your actual charges don't always match your stated monthly budget because the budget is a daily average, not a strict monthly limit, and the threshold determines when a charge occurs.
How to Understand Your Charges
- Check Your Billing Summary:
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This section in your Google Ads account shows your spending, upcoming charges, and when they will occur.
- Review Invoices:
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You can find invoices and receipts for past charges in the "Documents" section of your billing summary.