Search Lost IS (Budget) vs (Rank): What They Mean and What to Fix
Search lost IS (budget) means your budget ran out; lost IS (rank) means low Ad Rank. Learn how to read both and decide whether to add budget or improve ads.
The short answer
Search lost IS (budget) is the share of times your ads were eligible but did not show because the campaign's budget ran out. Search lost IS (rank) is the share of times they did not show because your Ad Rank was too low to win a place. Budget loss is fixed with money (or by spending the same money more carefully); rank loss is fixed with better ads, landing pages and bids. Fix budget loss first only if the campaign is profitable; otherwise more budget just buys more expensive conversions. The PPC Audit Tool reads both columns from your campaign export and flags campaigns where each kind of loss is large.
What the three impression share columns mean
Google Ads defines them like this (Google Ads Help, "Get impression share data"):
- Search impression share: the impressions you received on the Search Network divided by the estimated number of impressions you were eligible to receive.
- Search lost IS (budget): the percentage of time your ads were not shown on the Search Network because of insufficient budget. This column is available at the campaign level only.
- Search lost IS (rank): the percentage of time your ads were not shown on the Search Network because of poor Ad Rank.
Impression share explains how much of the available demand you are catching. The two "lost" columns explain why you missed the rest. Google notes that these metrics update within one to two days, so the last couple of days in any export may still change.
What Ad Rank depends on
Lost IS (rank) only makes sense once you know what goes into Ad Rank. Google lists these factors:
That list is why "raise the bid" is not the only answer to rank loss. Ad and landing-page quality is a lever on the same score, and Google says higher-quality ads typically lead to lower costs.
How to read the two numbers together
| Lost IS (budget) | Lost IS (rank) | What it usually means | First move |
|---|---|---|---|
| High | Low | You win auctions but run out of money | Budget, if CPA is on target |
| Low | High | Budget is fine, but you lose auctions | Ad quality, landing page, then bids |
| High | High | Underfunded and uncompetitive | Narrow targeting before adding budget |
| Low | Low | You show for most eligible searches | Look for new keywords to grow |
High budget loss, low rank loss
The campaign is competitive enough to win but stops showing partway through the day. If its CPA is at or below your target, this is the clearest growth opportunity in the account: more budget should buy more conversions at a similar cost. If its CPA is above target, do not add budget yet. Cut wasted spend first, for example with negative keywords from the search terms report, so the existing budget lasts longer.
Low budget loss, high rank loss
Money is not the limit; you are losing the auction. Before raising bids:
- Check that ads contain the words people search for and match the keywords in the ad group.
- Make sure the landing page answers the search directly and loads quickly.
- Add relevant assets such as sitelinks and callouts, which Google counts in Ad Rank.
- Then test bid increases on the keywords that already convert well.
Both high
The campaign is trying to cover more ground than its budget and quality can support. Adding budget alone usually makes rank loss look worse, because you enter more auctions you cannot win. Tighten targeting (fewer keywords, specific locations or hours, separate ad groups for the best themes) and fix quality before scaling.
Both low
You already show for most searches you are eligible for. Growth now comes from new keywords, broader match types where they convert, or new campaigns, not from bigger bids.
What the PPC Audit Tool checks
When your campaign export includes the Search lost IS (budget) and Search lost IS (rank) columns, the tool runs two checks per campaign. It averages each column across the rows in your file (for example, across days in a report segmented by day).
- Budget-limited and efficient: a campaign is flagged when its average lost IS (budget) is 20% or more and its CPA is at or below the account CPA (or there is no conversion data to compare). The suggested action is to test a 15–20% budget increase, funded from high-CPA campaigns, and watch marginal CPA for two weeks.
- Losing to rank: a campaign is flagged when its average lost IS (rank) is 40% or more and it has at least 1,000 impressions in the file. The suggested action is to review ad relevance and landing-page quality before raising bids.
Each finding shows the campaign name and the values behind it, so you can check the numbers in Google Ads yourself. If the columns are missing, the report says which columns to add and re-export. Files are processed in your browser and not uploaded.
How to export the right columns
Worked example
Two campaigns over the same 30 days, with an account average CPA of ₹900:
| Campaign | Lost IS (budget) | Lost IS (rank) | CPA |
|---|---|---|---|
| Brand | 35% | 5% | ₹400 |
| Generic yoga mats | 8% | 55% | ₹1,450 |
Brand loses a third of its possible impressions to budget while converting well below the account CPA, so it is the first place for extra money. Generic yoga mats has enough budget but loses more than half its auctions on rank, and it is already expensive. Raising its bids would likely push CPA higher still. Work on its ads and landing page first, and move some of its budget to Brand while you do.
Mistakes to avoid
- Treating impression share as a goal. 100% impression share on unprofitable searches is not success.
- Raising bids to fix budget loss. Higher bids spend the budget faster and make budget loss worse.
- Adding budget to fix rank loss. You will enter auctions you still cannot win.
- Judging from one or two days. Use at least a few weeks, and remember the most recent days may still update.
- Ignoring the CPA. Lost impression share only matters if the extra clicks would be profitable.
For the full order of checks, from tracking to wasted search terms, see how to audit a Google Ads account in 30 minutes.
Frequently asked questions
What is Search lost IS (budget)?
The percentage of time your ads were not shown on the Search Network because the campaign's budget was insufficient. Google reports it at the campaign level only.
What is Search lost IS (rank)?
The percentage of time your ads were not shown on the Search Network because your Ad Rank was too low. Ad Rank depends on your bid, ad and landing-page quality, thresholds, competition, search context and assets.
Should I increase budget or bids first?
Add budget to campaigns that lose impression share to budget while converting at or below target CPA. For rank loss, improve ads and landing pages first, then test higher bids on keywords that convert.
What counts as high lost impression share?
There is no official threshold. The PPC Audit Tool flags campaigns averaging 20% or more lost to budget while converting efficiently, and 40% or more lost to rank with at least 1,000 impressions.
How quickly does impression share data update?
Google says impression share metrics are updated within one to two days, so the most recent days in a report may still change.
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