Can a competitor drain my budget by clicking my ads?

Google has a name for exactly this

The category is invalid traffic. Google defines it broadly, as "traffic that doesn't represent genuine interest in your business."

The defence is not a single filter. Google describes three layers: "Google's global ad traffic quality team uses automated filters, machine learning, and manual reviews to detect and filter invalid traffic." Speed matters too, and Google claims it: "The team often detects this traffic as it happens or shortly after."

There is outside oversight, which is rarer than you might expect. Google states that "The Media Rating Council (MRC) accredits Google's invalid traffic detection and filtration processes, and an independent third party audits them annually."

One frustration is designed in. You cannot see how anything was caught. Google explains why: "To prevent bad actors who attempt to reverse-engineer Google defenses, detection methods and specific invalid traffic sources remain confidential."

That is sensible and still annoying. You can see that traffic was filtered. You cannot see why.

You are not charged for what gets caught in time

Timing decides the money question. There are two cases, and they work differently.

Google's own glossary sorts invalid clicks into three kinds, and the deliberate one gets its own label: "Manual clicks: Clicks that increase your ad costs or inflate publisher profits."

Caught before your bill closes, it never reaches you at all. Google puts it this way: "Invalid traffic (including impressions, clicks, interactions and conversions) detected before the end of the month is automatically removed from your billing and campaign reports, so no refunds are necessary."

Caught later, you get money back instead. "If invalid traffic is detected after you were billed for it, you'll receive credits in the form of a billing adjustment for the value of the invalid activity."

Notice what is missing from both. There is no form to file and nothing to claim. The usual worry is that you are quietly paying for a rival's clicking. That describes the system failing, not the system working.

Conversions are handled the same way, with a longer tail. Google says it "removes some invalid conversions if they originate from invalid traffic, or if they remain invalid for longer than 13 months". It warns that this "might show as a small drop in conversions over time."

There is one limit worth knowing, and Google states it directly: "Google protects your budget by filters that remove invalid traffic, but this traffic can still reach your website and lead forms."

So a filtered click can still become a junk form submission. Your bill is corrected. Your inbox is not.

That matters for how you judge the problem. If the complaint is wasted spend, the platform is already handling most of it. If the complaint is wasted time answering rubbish enquiries, filtering was never going to solve that, and the fix belongs on your form instead.

Your report and your invoice will never match, by design

This is the part that makes people suspect they are being short-changed. It is worth understanding before you go hunting a discrepancy.

Google states the mismatch plainly: "You may find many filtered invalid clicks in your campaign reports but small credit amounts in your billing documents. This is normal because these numbers are not directly related".

The two columns measure different moments. The invalid clicks column in your campaign report shows "traffic Google filters before you were billed". Credits "apply to invalid activity that Google detects after the billing cycle closes".

So a large filtered number with a tiny credit is the healthy shape. It means nearly everything was caught early. That is the outcome you want.

There is a second wrinkle if you compare months. Google freezes campaign metrics at month end so the data matches the invoice. The consequence is that "credits for past invalid activity may appear on your invoice but won't retroactively adjust your campaign data in Google Ads." Seeing the corrected view takes a different report, the Invalid Activity Credit Report, which "shows adjusted metrics, such as adjusted clicks, cost, and conversion rate".

Microsoft adjusts the bill and leaves the report alone

Worth knowing if you advertise in both places. The reporting behaviour differs, and it will mislead you.

Microsoft sorts every click three ways: "Each time your ad is clicked, Microsoft Advertising categorizes the click as either a standard-quality click, a low-quality click, or an invalid click." The bad ones "often originate from spiders, robots, questionable sources, or test servers."

Billing works as you would hope. "You only get billed for and pay for standard-quality clicks." Microsoft adds that "If we suspect invalid clicks generated by search engine robots, automated click tools, or other fraudulent means, we will automatically credit your account."

Then comes the trap, in Microsoft's own words. After your bill is adjusted, "the clicks will remain listed in your reports as 'standard-quality clicks.'"

Read that twice if you report on Microsoft performance. The money gets corrected. The report does not. Put a Microsoft click count beside a Google click count without knowing that, and you are comparing two different things.

Before you assume sabotage

Most click spikes are not attacks. Microsoft publishes the ordinary causes, and they are worth ruling out first.

It names seasonal changes, such as more online shopping over the holidays. Sales and promotions that bring extra traffic. News events that stimulate consumer interest. Changes to your ad text or your website. New links to your site from other sites.

One more thing to know before anyone sells you a number. Google states that "There is no industry standard for a normal invalid traffic rate." A tool quoting a percentage your account supposedly exceeds is quoting its own benchmark, not an agreed one.

Five checks, and the first four are free.

• Add the invalid clicks column to your campaign report. Seeing what is already filtered beats guessing.
• On Microsoft, add the low-quality clicks and low-quality click rate metrics. That is the nearest equivalent view.
• Look at billing adjustments for invalid activity separately. Expect a small number if filtering is working.
• Rule out the ordinary causes of a traffic change before treating it as deliberate.
• If you still believe something is wrong, Google provides a route to request an investigation. That is the proper next step, rather than rebuilding the campaign.

Work the arithmetic once and the shape stops looking alarming. Say a month shows 1,000 charged clicks. Another 60 are listed as invalid and filtered out. The invoice carries a 4 dollar credit for invalid activity.

Those 60 were never charged, so roughly 6 percent of attempted traffic was rejected before it touched your bill. The 4 dollars covers only what surfaced after the cycle closed. The two numbers are not a discrepancy, and they were never meant to reconcile. The figures are an illustration. The relationship between them is the part to remember.

Reading those columns properly, and telling a genuine problem from an ordinary month, is part of what we do on paid search.

Terms used on this page

• Cost per click
• Conversion

Sources

• About invalid traffic (Google Ads Help)
• Invalid clicks: Definition (Google Ads Help)
• Monitoring clicks, telling the good from the bad (Microsoft Advertising, Microsoft Learn)

Last reviewed 2026-09-11.