It ultimately depends on business goals. The ideal model is a flexible budget that is adaptable and responsive to changing category trends. In these cases, we focus on finding the right overall efficiency (TACoS) and adjusting the budget as needed to meet that goal.
This works best for brands that don’t have a specific revenue target in mind. For brands working towards a specific sales goal, it’s important to leverage category insights, seasonal trends, promo/launch calendars, and historical KPIs (if available). We use metrics like expected CPCs, traffic, unit session percentage, CVR, and AOV to understand the budget needed to reach the brand’s goals.