Microsoft announced that in the coming days, adCenter will undergo an update that'll minimize the daily budget overspend and deliver a more consistent, predictable spend of your budget dollars throughout the month. adCenter will now track your campaign budget spend in "near real time." There'll be almost "no time lag between a click recorded and spend tracked." As a result, your daily spend will more likely to adhere to your budget target.
Tina adds that "as a means of providing a bit of a buffer, ads mayn't be paused until you're at 120% of your daily budget. In other words, if you've set a daily budget of $100 (or a monthly budget of $3,000) and selected Divide budget across month option, adCenter will target to spend $100 a day and shouldn't exceed this limit by more than 20% on any given day, which's in line with industry standard. With this update you shouldn't see unexpected budget overspend on any day, which'll help you plan your budget more precisely."