Scaling a broken account makes the problem worse. Before you raise budgets, you need to know what queries are burning money. The negative keyword audit is the first thing to do before scaling.
What negative keywords actually do
Negative keywords prevent irrelevant queries from triggering your ads. Without them, your ad shows for searches that will never convert, and you pay for each one.
If you sell commercial HVAC service and you haven't added "residential" or "DIY" as negatives, you're paying for clicks from homeowners and hobbyists who will never call your sales team. The clicks look real. The conversions don't come. The account looks like it "works" because ads are showing and spend is moving.
Why most accounts skip this
There's no alarm when a negative keyword is missing. The account continues to serve impressions, generate clicks, and burn budget. The waste is invisible until you look at the search terms report.
When CPAs creep up, the first instinct is usually to adjust bids or swap ad copy. The search terms report sits unread. That's where the waste lives.
The audit process
Pull your Search Terms Report for the last 90 days. Sort by spend, descending. Look at the top 100 queries.
For each query, ask one question: does this match what I actually sell to the people who actually buy it?
Flag any query where the answer is no: wrong audience, wrong geography, wrong buying stage, wrong product category. Add flagged queries as negatives at the campaign level if they apply across all ad groups. Use ad group level if the exclusion is specific to one group.
Run this monthly. If you see a CPA spike, run it immediately.
Match types for negatives
- Exact: blocks that specific query, nothing else. Use this most.
- Phrase: blocks any query containing that phrase in that order. Use this for known waste patterns.
- Broad: blocks any query containing all those words in any order. Use sparingly, it can over-block.
Most negative keyword lists should be primarily exact and phrase. Broad negatives are for terms so clearly irrelevant that any variation of them is waste.
What accounts consistently miss
- Competitor brand terms, if you're not intentionally targeting competitors
- Job seeker terms: "jobs," "careers," "how to become a [your service]"
- DIY terms: "how to fix X yourself" when you sell X as a service
- Wrong geography signals: city or state names you don't serve
- Informational queries: "what is X," "X definition," "X explained" when your goal is a transaction
These don't show up in keyword research. They show up in search terms reports, after you've paid for them.
Before you scale
Run this audit before raising daily budgets or expanding to broader match types. Scaling spend into an account with missing negatives doesn't accelerate growth, it accelerates waste.
Use the Free Keyword Audit Tool on KeywordPlannerTools.com to surface gaps in your current keyword setup.
For a deeper look at identifying and closing negative keyword gaps, the Negative Keyword Gaps guide walks through the diagnostic in more detail.