How target cost worked
Target cost was a bidding option in Meta Ads Manager that aimed to keep the average cost of a result close to a figure you named, in both directions. That second part is what made it unusual. Where every other option is happy to take a cheap result whenever one appears, target cost was designed for stability: it would pass over unusually cheap opportunities in order to keep the average steady as spend increased.
It no longer exists. Meta withdrew the option and its work is now done by the cost-based goals that remain. If a guide, a template or a proposal tells you to select target cost in the ad set, that document is out of date — the setting is not in the menu, and no workaround recreates it.
Why target cost still matters
Mostly because it is still written down. Older blog posts, agency playbooks and training decks recommend it confidently, and it turns up in proposals written by people who have not opened Ads Manager recently. Recognising a retired setting is a quick and fair way to judge how current the rest of a document is.
The idea behind it is also worth keeping, even though the button is gone. Predictable cost has real value to a business planning stock, staffing or cash flow, and it is genuinely traded against getting the cheapest possible result. Any constrained strategy makes some version of that bargain.
Where target cost goes wrong
The obvious failure now is looking for it, not finding it, and assuming something is wrong with the account or with permissions. Nothing is wrong; the option was removed for everyone.
The subtler failure is inheriting its logic without noticing. People who liked target cost tend to set today’s goals with the same expectation — that cost will hold flat as budget grows. It generally will not. The surviving options aim at an average and will still accept cheap results when they appear, and they still get dearer as a budget pushes further into an audience. Expecting the old stability from a new setting produces a lot of unnecessary editing.
What to use instead
If you want a cost ceiling, use a cost per result goal and set it near what your account genuinely achieves rather than at an ambition. If you want maximum output and are willing to read the price the auction reports back, use highest volume and judge it against what a result is worth to you.
Where predictability is the real requirement, get it from budget discipline rather than from a bidding rule: steady daily spend, changes made in small steps, and a settled window before any judgement. And when you read an advertising plan that still specifies retired settings, treat it as a prompt to check what else in it has aged — that kind of review is a normal part of a Meta ads audit.