Negative Keywords: The Fastest Way to Stop Wasting Ad Spend

Every search you do not block is a search you might pay for

When you add a keyword to Google Ads, you are not buying that exact phrase. Unless you use exact match, and even then within limits, Google shows your ad for a range of searches it considers related. That is useful when it finds real customers you would not have thought of. It is expensive when it decides that plumber salary, how to fix a leaking pipe and free plumbing course are close enough to plumber near me.

Negative keywords are how you tell Google no. They are the cheapest optimization in the platform: no new ads, no new budget, just fewer wasted clicks. For most local service accounts we look at, cleaning up negatives is the first thing that moves cost per lead in the right direction.

Find the waste in the search terms report

Your keywords are what you bid on. Search terms are what people actually typed. The search terms report, found under Insights and reports in Google Ads, shows the searches that triggered your ads along with clicks, cost and conversions for each.

1. Open the search terms report for the last 30 days, or longer if volume is low.
2. Sort by cost, highest first. The expensive irrelevant terms are where the money is.
3. Look for patterns, not just single searches. Ten different searches containing jobs or training point to one negative keyword, not ten.
4. Check the conversion column. A term with spend and no conversions over a meaningful number of clicks deserves a closer look, but do not block a relevant term just because it has not converted yet.
5. Add the negatives directly from the report by selecting the terms, or note the root word and add it to a list.

One caveat: Google does not show every search term. Some queries are grouped out of the report for privacy reasons, so the report shows most of your spend but not all of it. That is one more reason to add proactive negatives for obvious waste rather than waiting for each one to appear.

How negative match types actually work

Negative keywords have three match types, and they behave differently from the positive match types with the same names. The biggest difference: negative keywords do not expand to close variants. A positive phrase match keyword will cover plurals, misspellings and similar meanings. A negative keyword will not. If you block job, searches for jobs can still show your ad unless you block that too.

In practice, single-word negative broad match does most of the work for obvious waste like jobs or salary. Phrase and exact match are for surgical cases where the words themselves are fine but a specific combination is not.

A starter list for most local service businesses

These themes show up in nearly every local service account. Treat them as a starting point to review, not a list to paste in blindly, and add the plural and singular forms you need.

• Employment: jobs, job, careers, hiring, salary, wages, resume, apprenticeship, internship.
• Training: course, courses, class, certification, school, training, license exam.
• Do it yourself: DIY, "how to", tutorial, youtube, video, step by step.
• Free and bargain hunting: free, cheapest, used, secondhand. Check this group carefully against what you offer.
• Research only: definition, meaning, wiki, template, pdf, statistics.
• Wrong business type: wholesale, supplier, manufacturer, parts, if you only sell the service.
• Places you do not serve: city or county names outside your service area that people include in searches.

The careful part is knowing your own business. If you advertise free estimates, blocking free will block free estimate searches, which may be your best traffic. Use the phrase negative "for free" or block specific combinations instead. If you run a training program, the training group obviously does not apply.

Where to add negatives: ad group, campaign, list or account

Negative keywords can live at several levels, and choosing the right one keeps the account manageable.

• Ad group level: blocks a search for one ad group only. Mostly used to route traffic, for example adding emergency as a negative in a general repair ad group so emergency searches go to the ad group built for them.
• Campaign level: blocks a search for everything in that campaign.
• Shared negative keyword lists: built once in the shared library and applied to as many campaigns as you like. This is where the employment, training and DIY themes belong, so new campaigns get them immediately.
• Account level: a single list applied across eligible campaigns in the account, useful for terms you never want to appear on anywhere, such as brand-safety terms.

A simple structure that holds up well: one shared list for universal waste, one shared list for locations you do not serve, and campaign or ad group negatives for routing and for anything specific to one service.

Mistakes that block your own customers

Negatives are powerful in both directions. An over-eager list can quietly cut off searches that would have become jobs, and nothing in the account will warn you loudly when it happens.

• Adding a broad single word that appears in good searches, such as cost or price, when people comparing prices are often ready to buy.
• Blocking a word in a shared list that one campaign actually needs.
• Adding a negative that matches one of your own keywords, which stops that keyword from showing at all. Check new negatives against your keyword list before saving.
• Forgetting that negatives do not cover variants, then assuming job also blocks jobs.
• Never revisiting old negatives after you add a new service.

When performance drops right after a round of negatives, review what you added before blaming the market.

A weekly routine that keeps waste down

Negatives are not a one-time job. New search terms show up every week, especially on broad and phrase match keywords.

1. Review the search terms report weekly for active campaigns, sorted by cost.
2. Add clear waste to the right shared list or campaign the same day.
3. Note borderline terms and check them again once they have more data.
4. Once a month, read your negative lists from top to bottom and remove anything that now blocks a service you offer.
5. Compare cost per lead month over month. Fewer wasted clicks should show up there, which is why accurate call and form tracking matters.

This is a standing part of how we manage paid media at ROEM: shared negative lists on day one, then weekly search term reviews, with every change judged against tracked leads. If you are setting a budget for the first time, pair this with our guide on how much a small business should spend on Google Ads, or see how we run Google Ads in Orlando.

Frequently asked questions