Two Google Ads accounts can both be described as “not getting enough impressions” and need completely opposite fixes. The impression share data tells you which one you actually have, and most accounts never get checked against it.
Two different problems that look identical from the outside
Rank-limited means your ads are eligible but losing the auction on relevance and bid combined, a quality score, ad relevance or bid strength issue. Budget-limited means your ads would win more auctions, but the daily budget runs out before the day does, and the campaign simply stops serving until the next day’s reset.
Where to actually look
Impression share reporting breaks lost impression share into two separate columns: lost to rank, and lost to budget. A campaign showing the majority of its lost share as “budget” has already won the relevance argument, spending more, not rewriting ads, is the lever that actually moves it.
Why the wrong fix wastes real money
Increasing bids on a budget-limited campaign burns through the same finite budget faster without buying more actual reach, it can make the exhaustion happen earlier in the day rather than fix it. Rewriting ad copy on a budget-limited campaign fixes something that was never the real constraint.
What a genuine fix looks like
If it is budget-limited: raise the daily budget where the return justifies it, or narrow targeting, keywords, location or schedule, so the existing budget covers a smaller, higher-intent audience for the full day instead of a broad one for a few hours. If it is rank-limited: work on ad relevance, landing-page match and bid competitiveness instead.
Diagnosing which one you have before spending more is exactly what a real Google Ads management engagement should start with.
Frequently asked questions
Can a campaign be both budget- and rank-limited at once?
Yes, and the impression-share breakdown will show a genuine split between the two, worth checking rather than assuming it is purely one or the other.
Does raising the budget always help a budget-limited campaign?
Only if the additional spend goes toward relevant additional demand. If the campaign is already reaching everyone genuinely searching, more budget against a saturated keyword set will not create new impressions.
Primary reference: Google Ads Help — About impression share.