Google Ads spent more than my daily budget. Is that allowed?

The two limits

• The day. "On a given day, your campaign might spend up to twice your average daily budget." With a $50 budget, a $100 day is inside the rules.
• The month. "At the end of the month, you will have spent no more than 30.4 times your average daily budget." 30.4 is the average number of days in a month. With $50 a day, the monthly cap is $1,520.
• Above the cap. Google says "you'll never actually pay more than your spending limits": costs served above the limit come back as credits.

Why it happens

Traffic is not the same every day. The daily budget is an average, so Google spends more on busy days and less on quiet ones, and the month evens out.

When a day looks impossible

If a single day spent many times the budget, the 2x rule does not explain it. Check, in this order:

• Change history. Was the budget really what you think, on that day? A missing zero is more common than a Google bug.
• The invoice, not the dashboard. What counts is what you are billed after credits. Wait for the monthly invoice before you escalate.

If you want a hard daily stop

The daily budget is not a hard stop. If you need one, lower the budget on the days you care about, or use an automated rule: Google's own example runs daily with data from the "Same month" and pauses any campaign that has spent a set amount so far this month (Common ways to use automated rules). Rules run within about two hours of the condition, so it is a brake, not a wall.