A carpet cleaner in Christchurch adds the keyword "carpet cleaning" to his Google Ads account and goes to bed. Next week he checks the searches that triggered his ad. Some are great: "carpet cleaning Christchurch", "stain removal for wool carpet". Others are "carpet cleaning jobs", "how to clean carpet yourself" and "carpet cleaner hire".
He paid for every one of those clicks.
That gap between the keyword you type in and the searches that actually show your ad is controlled by a setting called match type. It's small, it's easy to ignore, and it decides where a lot of your money goes.
What the three match types do
Each keyword you add can be set to one of three types.
Broad match lets your ad show for searches that mean something related to your keyword. They don't have to contain your words at all. It reaches the most people, and it also makes the most mistakes.
Phrase match needs the meaning of your keyword to be in the search. Other words can come before or after it. So "emergency plumber" can match "emergency plumber near me" or "emergency plumber open on Sunday".
Exact match is the tightest. It used to mean the same words in the same order. It no longer does. Google now matches it on meaning too, so it also catches close variations. It's still the one that gives you the most control, but it's closer to phrase match than it was a few years ago.
In the ad account you'll see them written as plain words (broad), "quotes" (phrase) and [square brackets] (exact).
Why the setting matters more on a small budget
If you spend $5,000 a month, a few wasted clicks is a rounding error. If you spend $600, every wasted click is a real chunk of your enquiries. Our full guide to Google and Meta ads covers where a small budget should go first.
Broad match isn't bad. The trouble is that it works best when Google has plenty of your past results to learn from. A new account has none. So Google is guessing what a good customer looks like, and it guesses with your money.
Google's own numbers show it's not a magic switch either. For the full AI Max package, which is Google's newer automated search tool, Google says advertisers get about 7% more conversions at a similar cost. That's Google's figure from its own data. Outside agencies have reported much weaker results in some accounts, including one study of 30,000 search terms where nearly all the AI Max impressions led to zero conversions. Those studies are mixed, and every account is different. The safe reading is: it can help, and you need to watch it.
What to start with
For a new account or a small budget, start with phrase match on your main keywords, plus a small number of exact match ones for the searches you already know make money.
Say you're an electrician in Tauranga. Your exact keywords might be "electrician Tauranga" and "emergency electrician Tauranga". Your phrase keywords might be "electrician for heat pump install" and "switchboard upgrade". You'll get some searches you didn't predict, but they'll all still be about what you do.
Leave broad match until you have real results. A rough rule of thumb, not a Google rule: wait until your account is getting at least 30 enquiries a month and you've recorded them properly. If your conversion tracking is shaky, broad match will learn from bad information, and a wrong setup quietly skews your numbers. Fix that first.
Once you do try broad match, put it in its own campaign with its own small budget. Don't swap it in over the top of the keywords that already work.
Negative keywords are half the job
Match types tell Google what to include. Negative keywords tell it what to leave out, and they matter just as much.
The carpet cleaner's fix is simple. He adds "jobs", "careers", "course", "hire", "diy" and "how to" as negative keywords. That alone cuts out most of the junk he saw.
Two things catch people out. Negatives don't cover close variations on their own. If you block "jobs", you also need "job" and "employment" if those show up. And be careful with words that sound useless but aren't. Don't block "cheap" if you actually do budget jobs, or "free" if you offer a free quote.
Set aside ten minutes every week for the first couple of months. Open the search terms report, sort by money spent, and look for anything that cost you something and got you nothing. Add those as negatives. Over time your ads stop showing for the wrong people.
A quick check you can do today
Open your search terms report for the last 30 days. Count how many of the top 20 searches by spend you'd actually want a phone call from. If it's fewer than 15, your match types are probably too loose, or your negative list is too short.
