An advertiser wants to simulate a what-if scenario involving changes to both their ROAS targets and their budgets simultaneously. Which tool is designed for this long-term planning?

Performance Planner is the tool designed for this. It builds forecasts from the account's own recent performance and auction data, then lets the advertiser model how results would change at different spend levels and different targets — including moving budget and Target ROAS or Target CPA together, which is exactly the trade-off being described. The output is a curve showing forecast conversions or conversion value at each spend point, so the advertiser can see where extra budget still pays for itself and where returns flatten. Plans can cover multiple campaigns and future date ranges, which makes it a planning tool rather than a reporting one, and recommended changes can be applied directly to the account. It answers the question every advertiser eventually faces: if we loosen the ROAS target and spend more, what do we expect to get back?