Running ads · By Grant Epley · Updated October 4, 2026
Why did my cost per click go up this month?
By Grant Epley · Updated October 4, 2026
Most often, a change in your own account lets Google bid more per click: a new bid strategy or target, or broader keywords. If nothing changed, more competitors are bidding on the same searches this month. Check Change history first, then Auction insights, and judge both on cost per lead.
If your cost per lead held steady, leave the cost per click alone
Check whether the clicks got worse or only more expensive, before you hunt for a cause. If your cost per lead or cost per booked job stayed flat, a higher cost per click is not a problem to fix. If it rose too, work through the causes below in order.
Compare equal periods. A 31-day month against a 30-day month, or a month with a holiday week against one without, can move the numbers on its own. Compare the same number of days, side by side.
Count the clicks before you trust the average. Average CPC is total cost divided by clicks. On 40 clicks a month, a handful of pricey ones can move it a long way. On 400, a rise means something.
- In Google Ads, click the down arrow next to the date range in the upper right corner.
- Turn on the toggle next to Compare, then select Previous period.
- Pick the period you want to check, keep both periods the same length and back to back, and click Apply. A percentage change appears under each number in the table.
For example
Last month: $2,000 bought 200 clicks at $10 each and brought 20 leads, so $100 per lead. This month: the same $2,000 bought 160 clicks at $12.50 each and still brought 20 leads, so still $100 per lead. The cost per click rose 25%. The cost of a lead did not move, and the fewer, pricier clicks did the same job.
Then open Explanations and let Google name the cause
If the cost per lead went up too, start with Explanations. Google built them for this question: they compare two periods and list what changed, including bid changes, budget changes, targeting changes, and auction competition and search interest.
With Compare on, numbers with a significant change turn blue with a dotted underline. Hover over the blue number in the Cost or Clicks column on the Campaigns page, then click View explanations.
If nothing is blue, Explanations found no significant change, or they are not available for that date range. They will not show if the range includes today or reaches back further than the last 90 days, or if the two periods are not the same length and back to back, and Google only explains the metrics the campaign optimizes toward.
What if my bid strategy optimizes for conversions?
On Maximize conversions or Target CPA, Google explains Cost and Conversions (and, for Target CPA, Actual CPA in the bid strategy report), not cost per click. That is a hint worth taking: Google says that in Target CPA campaigns, cost per conversion and other conversion metrics may be better indicators of performance than cost per click.
To see those explanations, click the link in the campaign's Bid strategy type column. It opens the bid strategy report, where you can hover over the values and view explanations the same way.
The causes, most likely first
If you or Google changed a setting, Change history will show it
Open Change history within the Campaigns menu, set the date range to cover both months, and read every change from the week before the cost went up. Google keeps 2 years of changes, maps them against your clicks and cost, and lets you filter by the type of change.
Change history
2 years
of changes to your account, campaigns and ad groups, and who made most of them.
What to look for. A new bid strategy, a higher target, a raised bid or bid limit, new keywords or a match type changed to broad, and new locations or audiences. Any of them can lift what you pay per click.
Check the User column. It shows the email of whoever made each change in the interface. Changes made by a tool through the API may show "Google Ads API" or the tool's name, and changes Google's own systems made may show "Google Ads system". If the change came from someone else, ask them why they made it and what result they expected.
Then check what Google applied on its own. If auto-apply is on, Google applies recommendations without asking. Open Recommendations and look at the History tab for a summary of what was applied, and the Manage tab for what you are opted into.
Which auto-applied recommendations can raise your cost per click?
Google lists the recommendations it can apply automatically. These are the ones that change what you bid or which searches you enter:
Bidding: "Bid more efficiently with Maximize conversions", "Bid more efficiently with Target impression share", "Adjust your CPA targets" and "Set a target CPA", among others.
Keywords and targeting: "Add broad match keywords", "Add keywords", "Expand your reach with Google search partners" and "Use Display expansion".
Google says auto-apply will not raise your budget. It can still change how the budget gets spent.
Auto-apply is an account-level setting, turned on or off from the top bar of the Recommendations section. If you turn it off, keep the recommendations you would have chosen and apply those by hand.
If you switched bid strategy, judge it on cost per lead, then cap it if you must
If Change history shows a new bid strategy, judge it on cost per lead. A strategy Google runs sets each bid for its own goal, and cheap clicks may not be that goal.
- Manual CPC
- You set the maximum CPC for each ad group or keyword. Google says it is the most you will typically be charged for a click, and you often pay less.
- Your cost per click can pass your bid if, for example, you set bid adjustments. Otherwise it rises only if you raise your bids.
- Maximize clicks
- Google sets bids to get as many clicks as possible within your budget. You can add a Maximum CPC bid limit for the whole campaign.
- Check the limit first. If someone raised or removed it, Google can bid higher than it did last month.
- Maximize conversions or Target CPA
- Google sets each bid to get the most conversions while spending your budget, or the most at the cost per action you target.
- It is built to buy conversions, not cheap clicks. A higher cost per click is expected here. A higher cost per conversion is the problem.
- Target impression share
- Google bids to show your ad at the top, at the absolute top, or anywhere on the page, as often as the share you set.
- Top spots cost more per click. Google says clicks above the search results often cost more than clicks below them.
You set the bid
Google sets the bid
Google sets the bid
Google sets the bid
If Change history shows a switch to Maximize conversions or Target CPA, give it about 2 weeks to learn and then compare cost per lead, not cost per click. If cost per lead is up as well, go back to what worked, or lower the target in small steps.
If the switch was to Target impression share on searches other than your own business name, check what share it targets. Asking to be the first ad on most searches for "water heater repair" is asking to pay the top price on most of them.
Why did my Target CPA campaign get more expensive after August 2026?
Starting August 17, 2026, Google changed how Target CPA and Target ROAS campaigns behave when they are limited by budget. Those campaigns now deliver closer to the target you set.
If a campaign limited by budget had a $100 target and was getting leads at $70, it now works toward $100, so it may bid more per click. Google's own advice is to set the target to the cost you are getting if you want to keep that performance. Open the campaign, check the target against its recent actual cost per conversion, and bring the target down to match.
If nothing changed, open Auction insights and look for new competitors
When nobody touched the account, the price usually moved because the auction did. You pay roughly what it takes to beat the advertisers ranked below you, so when a new company starts bidding on your searches, or an existing one bids more, your cost per click rises without any change on your side.
To see who you are up against, open Campaigns within the Campaigns menu, check the box next to a Search campaign, and select Auction insights. Use the same two date ranges you compared earlier.
- A name that was not there last month is a new competitor in your auctions.
- A higher Overlap rate means a competitor shows alongside your ads more often.
- A higher Position above rate means a competitor outranks you more often when you both show.
- A lower Impression share on your own row, with nothing changed in your account, can mean others are winning more of the auctions. Compare Search lost IS (rank) with Search lost IS (budget) to tell which.
Some of it is the calendar. The first hot week sends more people searching for AC repair, and more companies bid for them. Context counts in the auction too: Google weighs the time of the search, the device and the location, so the same keyword can cost more at one time of day than another.
You cannot stop a competitor from bidding. You can decide where to meet the price: keep bidding on the searches that book jobs, and stop paying for the rest. The next two sections cover both.
Why the report sometimes shows nothing
Auction insights only appear for campaigns, ad groups and keywords with enough activity in the period you pick, and the report shows no insights when your impression share is under 10%. Try the whole campaign over a longer range.
You may also see google.com listed. Google says that can happen if you use Google-hosted domains or a Google Business Profile, or if a competitor's landing page is a Google Site.
How the price of a click is set
Every search runs its own auction. Google ranks the ads by Ad Rank, which combines your bid, the quality of your ad and landing page, the minimum thresholds, how competitive the auction is, and the context of the search.
Google charges the winner only what it takes to beat the Ad Rank of the advertiser directly below, or to clear the reserve price if no one is below. The competitors below that one count too, and the further ahead you are, the more you may pay. That is why your price depends on what others bid as much as on what you bid. Google adds that, even if a competitor bids more, you can still win a higher spot at a lower price with relevant keywords and ads.
If your ads match different searches now, cut the ones that do not book jobs
Open Campaigns, then Insights & reports, then Search terms, and compare this month with last. Sort by cost. Any search you would never pay for, like a job you do not do or a town you do not serve, goes on your negative keyword list.
This is how broader matching raises your cost per click. Broad match is the default match type for new keywords, and Google says it can show your ads on searches related to your keyword that do not carry its direct meaning. Each new kind of search brings its own price. A plumber's ad that starts matching commercial or emergency searches lands in more expensive auctions.
Google suggests comparing two periods in this report to find the search terms that drove a change. Low-volume searches are left out to protect privacy, so the list will not add up to every click.
Where new searches come from without you adding keywords
Three things in the account can widen your matching without a new keyword list. A keyword changed to broad match. The "Add broad match keywords" recommendation, applied automatically. AI Max, which Google turns on by default in new Search campaigns and which expands on your keywords to reach searches you might otherwise miss. Change history shows the first two. The campaign's settings show the third.
If your ad or landing page changed, check Quality Score history
If your ad or website changed before the price rose, compare Quality Score month to month. Google says higher quality ads can lead to lower prices and better ad positions, so an ad or landing page that got worse can cost more to keep the same spot.
Open Campaigns, then Audiences, keywords, and content, then Search keywords. Click the columns icon, open the Quality score section and add Quality Score (hist.), Exp. CTR (hist.), Ad Relevance (hist.) and Landing Page Exper. (hist.), then click Apply. Compare the two months for the keywords that spend the most.
A drop in landing page experience after a website redesign, a new page or removed content points at the site. A drop in expected clickthrough rate points at the ad. Each component is graded against other advertisers who showed for the exact same search over the last 90 days.
Is Quality Score what sets my price?
No. Google says Quality Score is a diagnostic and not an input in the ad auction. The auction uses its own measure of quality at the moment of each search. Treat Quality Score as a warning light: when it falls, the quality the auction sees has likely fallen too.
Before you change anything
If you want a ceiling, set the bid limit from your real average
A bid limit stops Google's bidding from paying more than an amount you choose. Set it from your actual average cost per click, not from what you wish you paid.
Google's own example: if you have been losing impression share to Ad Rank, setting a bid limit below your current average CPC can make performance swing further. On Target impression share, Google warns that a limit set too low can stop the strategy from reaching its goal at all.
To see whether you are losing auctions on price, add Search impr. share and Search lost IS (rank) from the Competitive metrics columns. A rising lost share to rank means your Ad Rank was too low to show more often: competitors bidding more, or your own bid or ad quality falling.
If you change something, change one thing and wait two weeks
Google says Smart Bidding takes about 2 weeks to learn and fully optimize, and recommends small changes over large ones. Undo one change, or make one fix, then judge it on cost per lead after two weeks.
Google's example: if your cost per conversion has been about $10 for 14 days, cutting the target to $2 can cut how often your ads show. Move a target in steps.
If you cannot find the cause in your own account, it is the auction. Then the question is whether the jobs still pay at the new price, and the answer is in your cost per booked job.