How Target Impression Share works
You tell Google two things: where on the page you want to appear — anywhere on the results page, top of the page, or the very first ad slot — and what share of your eligible auctions you want to appear in. The system then sets bids automatically, raising them where holding that position needs more and easing off where it does not. A maximum cost per click sits alongside the target as a ceiling, and it is the ceiling that stops the strategy running away with the budget.
The counterpart metric is impression share, which reports what you actually got. The strategy is simply an instruction to chase a chosen level of it, so the two are read together: the target is the ask, the reported share is the result.
Why Target Impression Share matters
It is the only Google Ads bid strategy that optimises for presence rather than outcome. Everything else — clicks, conversions, revenue — is chasing something that happens after the impression. This one buys the impression itself, which makes it the right tool for a narrow set of jobs: defending your own brand terms, holding position on a handful of high-value keywords a competitor keeps outbidding you on, or supporting a launch where being seen is the point.
For a small advertiser in a thin auction, it can also be a blunt but effective way to stop being crowded out by a larger competitor on the few searches that genuinely matter to the business.
Common mistakes with Target Impression Share
The most expensive mistake is using it on generic keywords with real competition. Position is bought at whatever the auction demands, and the strategy has no idea whether the traffic converts, so cost per lead can climb quietly while the dashboard shows a satisfying share figure. It should never be the default across a whole account.
The second is leaving the maximum cost-per-click ceiling unset or set very high. Without a sensible cap the strategy will pay what it must, and on a competitive term that can drain a daily budget before lunchtime. The third is asking for near-total coverage: the last slice of any auction is the dearest and the least motivated, so the cost of the final stretch is out of proportion to what it brings.
How to act on it
Scope it tightly. Put it on a brand campaign or a small, deliberately chosen set of terms, and leave the rest of the account on a goal that measures results. Always set the cost-per-click ceiling, and set it at a level you would be content to pay on a normal day, not at your absolute limit.
Then review it like a spend decision rather than a performance metric. Look at what the campaign cost and what it produced over the same window, and be honest about whether the position was worth the premium. If a well-structured search campaign on a conversion goal is already reaching those searches profitably, you probably do not need this strategy at all.