When is it appropriate to pause underperforming keywords or ad groups?

Why pause decisions need rules, not instinct

Most accounts I audit pause keywords by feeling. A keyword looks expensive in the morning, the operator pauses it, and Smart Bidding loses a learning signal on the ad group for the next two weeks. Pausing without a rule is more expensive than pausing too late, because every paused keyword shifts budget into the next worst keyword in the auction. Six rules below cover ninety percent of the pause decisions a search account needs across a year. Apply them in order. The seventh rule, the statistical-significance caveat, sits underneath all six.

Rule 1: spend hits twice the target CPA with zero conversions across 100 clicks

If a keyword has spent twice the target CPA and produced no conversions across at least 100 clicks, pause it.

The 100-click floor matters. At 30 clicks a keyword that converts at the campaign average of 3 percent has a 40 percent chance of showing zero conversions through pure variance. At 100 clicks that probability drops below 5 percent. Two-times-CPA at 100 clicks is the point where the keyword has earned the right to be called a loser rather than unlucky.

Exception: branded keywords and assist-heavy queries that show conversions in a path report but not a last-click report. Check the free 25-page audit attribution section before pausing anything that looks like a branded or upper-funnel term.

Rule 2: conversion rate below half of campaign average across 100 clicks

If a keyword converts at less than half the campaign average over 100 clicks, pause it or move it to a lower-bid ad group.

Half the campaign average is the threshold where Smart Bidding starts subsidizing the keyword by pulling budget from better performers. A campaign converting at 4 percent overall is paying twice as much per acquisition on a keyword converting at 1.8 percent. The platform will keep bidding on it as long as the target CPA looks like it might still be hit at the campaign level.

The lower-bid ad group move is the softer option. Build a “watch list” ad group with manual CPC bids capped at half the campaign average CPC. Move marginal keywords there. If they recover over 60 days, promote them back. If they stay flat, pause.

Rule 3: Quality Score under 4 for 30 consecutive days

If a keyword sits at Quality Score 3 or below for 30 straight days, pause it or rebuild the ad group around it.

Quality Score below 4 means Google is charging roughly double the cost-per-click of competitors bidding on the same query at a score of 8. Thirty days is the window where short-term ad copy variance gets averaged out and the score reflects the structural mismatch between keyword, ad, and landing page.

Three diagnostic columns tell you which lever to pull before pausing: Landing Page Experience, Ad Relevance, Expected CTR. Two columns at “below average” usually means the ad group is the wrong home for the keyword. The rebuild is faster than the pause-and-replace cycle on a keyword with real intent.

Rule 4: zero impressions for 14 days on a budgeted ad group

If an ad group has shown zero impressions for 14 consecutive days while the campaign is hitting daily budget, pause the ad group.

The 14-day window filters out seasonality and weekend lulls. A budgeted campaign with a frozen ad group means the bid is too low to enter the auction, the keywords have been outcompeted on relevance, or the targeting has collapsed. Pausing returns the budget to ad groups that can spend it.

If the campaign is not hitting daily budget and an ad group has zero impressions, the diagnosis is different. The keywords are too narrow or the bids are below the first-page threshold. That is a rebuild, not a pause.

Rule 5: search terms 80 percent irrelevant after a negative-keyword pass

If a keyword’s last 90 days of search terms show 80 percent or more irrelevance after a fresh negative-keyword pass, pause the keyword.

Eighty percent is the threshold where the keyword is no longer matching the intent it was named for. A broad match keyword that triggers ten relevant queries and forty irrelevant ones is functioning as a different keyword. Adding negatives slows the bleed, but a keyword that needs a hundred negatives to behave is a keyword that should be paused and replaced with the exact-match versions of the queries that converted.

The ad-spend efficiency calculator shows what percentage of spend on each keyword went to queries that ever converted across the trailing 90 days. Anything below 20 percent is a pause candidate.

Rule 6: contribution margin turns negative on the keyword

If a keyword’s revenue minus cost of goods minus ad spend goes negative across a meaningful sample, pause it regardless of conversion volume.

This is the rule that catches the keyword that converts well but on the wrong product. A keyword pushing low-margin SKUs at a target CPA that assumed average-margin SKUs is losing money on every click, even though the campaign dashboard shows it hitting target. Pull conversion value by SKU mix on the top thirty spenders every quarter. Pause the negative-margin keywords or route them to a campaign with a tighter ROAS target.

Pause decision rules summary

Trigger condition	Threshold	Action
Spend without conversions	2x target CPA on 100+ clicks	Pause keyword
Conversion rate floor	Under half campaign average across 100 clicks	Pause or move to watch-list group
Quality Score	Under 4 for 30 consecutive days	Restructure ad group
Impression freeze	Zero impressions for 14 days on budgeted campaign	Check budget and eligibility
Search-term irrelevance	Above 80 percent irrelevant after negatives	Pause ad group
Contribution margin	Negative on 30-day rolling sample	Pause or reroute to tighter ROAS target

The statistical-significance caveat for small accounts

Every rule above assumes the account generates enough clicks for the thresholds to mean anything. Most do not.

An account spending three thousand dollars a month on a long-tail keyword set may have keywords that take four months to reach 100 clicks. Pausing at 30 clicks because spend hit two-times CPA throws away the signal before it could form. The fix is to apply the rules at the ad group level on small accounts, not the keyword level. Aggregate ten keywords into one themed group, run the rules against the group’s totals, and pause the group if it fails the test across the same thresholds.

A rough proxy: if a keyword has spent less than the cost of one conversion at target CPA, the data is too thin to act on. Wait or consolidate.

Ad group level vs keyword level: which lever to pull

The pause lever changes shape depending on what the data tells you.

Pause at the keyword level when one or two keywords inside a healthy ad group are dragging the average down. The other keywords keep the ad group’s learning signal alive and the budget routes to them. This is the default pause for Rules 1, 2, and 6.

Pause at the ad group level when the failure is structural: most keywords in the group share the same Quality Score problem, the same intent mismatch, or the same zero-impression freeze. Pausing one keyword at a time inside a broken ad group buys two weeks before the next one fails the test. Pause the whole group, rebuild the keyword list around the queries that converted, and relaunch with three new responsive search ads. This is the default pause for Rules 3, 4, and 5.

When two of the six pause rules fire on the same ad group, the attribution section of the free 25-page audit is the next read; the contact form is open when the diagnosis points at something deeper than a settings change.

The full wasted-ad-spend library covers the rebuild patterns once the pause decisions are clean.