Guide

Invalid Traffic (IVT) in 2026: How to Detect, Prevent, and Recover

By Naomi Kowalski

Reviewed by Senior Media Buyers

Invalid traffic (IVT) eats up 14 to 25% of paid ad budgets. This guide walks you through how to spot IVT warning signs, stop it with up-to-date tools, and claim refunds from Google for invalid clicks.

What Is Invalid Traffic (IVT)?

Invalid traffic (IVT) is any click or impression on a digital ad that doesn't come from a real user with a genuine interest. This covers accidental clicks, bot activity, crawlers, data centre traffic, and deliberate fraud by competitors or publishers trying to bump up revenue. Google splits IVT into two types: General Invalid Traffic (GIVT) (for example, known bots, spiders, and duplicate clicks) and Sophisticated Invalid Traffic (SIVT) (such as residential proxy networks, click farms, and AI-generated traffic). In 2026, SIVT makes up a growing slice of ad fraud, with AI-agent traffic increasing roughly 78x year-on-year according to industry reports.

IVT isn't just a drain on your budget, it skews your campaign data, leading to poor optimisation decisions. A campaign that looks like it's performing well on CTR could actually be hit by invalid clicks, tricking you into scaling losing strategies. Understanding IVT is the first step to protecting your ad spend.

Key Detection Signals of IVT

Spotting IVT means watching for patterns that stray from normal human behaviour. Here are the most common signals:

• Spike in CTR with low conversion rate: A sudden rise in click-through rate, say, from 2% to 15%, without a matching jump in conversions is a classic sign of IVT.
• High bounce rate (over 90%) from paid traffic: If most clicks leave your site straight away, they're probably bots or misclicks.
• Abnormal geographic distribution: Clicks from regions you don't target, or from data centre IPs (like AWS or Google Cloud), are a red flag.
• Same IP clicking multiple times in a short period: Some repetition is normal, but dozens of clicks from one IP within minutes points to fraud.
• Session duration under 2 seconds: Bots tend to load pages and then bounce almost instantly.
• Unusual device or browser combination: A sudden rush of clicks from dated browsers or unfamiliar user agents often points to botnets at work.

These indicators are best picked up by analytics tools that can screen out known bots and flag anything suspicious. But SIVT frequently copies human behaviour, for example, residential proxies swap IPs and use real browsers, so basic detection tends to miss it.

How IVT Affects Your Campaigns

IVT is a direct drain on ad budgets. Industry estimates put the share of invalid paid clicks at 14% to 25%, which means as much as a quarter of your spend never generates genuine engagement. Beyond the wasted cash, IVT distorts your optimisation data: you might pause a keyword that was doing well because invalid clicks inflated its cost, or scale up a campaign riddled with fraud thinking it's profitable. The result is poor budget allocation and lost opportunities.

On Google Ads, high IVT levels can also lead to automated account suspensions or limit your delivery. Google's invalid traffic team automatically filters some clicks, but they don't refund every piece of invalid activity. Advertisers need to identify and challenge invalid traffic themselves to get their money back. In 2026, with Performance Max campaigns dominating the landscape, the problem is getting worse because Google blocks third-party access to PMax click logs, making do-it-yourself IP blocking useless.

Prevention Strategies: What Actually Works in 2026

Stopping IVT means taking a layered approach. Here are some practical steps:

• Use click-fraud detection services: Managed services (like Unled Network) handle real-time blocking and refund recovery. They cover channels where DIY tools fall short, such as Performance Max (Google blocks PMax API access for IP blockers) and advanced SIVT that cycles through IP addresses.
• Manually add IP exclusions: For campaigns outside PMax, you can add known bad IPs to your Google Ads account. But this is reactive and doesn't catch residential proxies.
• Make the most of Google's built-in filters: Switch on 'Click fraud protection' in your account settings, but be aware of its limits, it only picks up the most obvious patterns.
• Check campaign anomalies every day: Set up alerts for unusual CTR spikes, sudden drops in conversions, or unexpected geographic changes.
• Add CAPTCHA to your landing pages: This can stop simple bots, but sophisticated fraud gets past CAPTCHA using click farms or AI.
• Work with a managed protection provider: They combine machine learning with human analysis to spot SIVT, submit Google refund claims for you, and keep up with new fraud tactics.

DIY IP blocklists just aren't enough anymore. Today's fraud uses residential proxies (IPs borrowed from real users' devices) and AI agents that imitate human clicks, so prevention has to be dynamic and tailored to each channel.

How to Recover Wasted Ad Spend: Google Invalid Traffic Refunds

Google does refund invalid traffic, but the process is manual and usually requires solid evidence. You have to submit a claim through Google Ads support with timestamps, IPs and reasons for each invalid click. Google reviews it and may credit your account. But a lot of advertisers miss out because they don't track IVT properly or find the whole process too much hassle.

Managed click-fraud protection services make it easy: they automatically spot invalid clicks, put the evidence together, and file refund requests on your behalf. That can recover 5% to 15% of your monthly ad spend, depending on how much fraud there is. If you spend £50,000 a month and 20% is invalid, even getting half of that back saves you £5,000. In 2026, with SIVT on the rise, proactive refund recovery is vital to protect your ROI.

The Growing Threat: SIVT and AI-Agent Traffic

Sophisticated Invalid Traffic (SIVT) is the most dangerous kind of IVT because it copies human behaviour. It makes use of residential proxy networks (IPs from real homes), click farms (low-paid workers clicking ads), and AI agents that imitate mouse movements and browsing patterns. Industry reports show AI-agent traffic grew about 78 times year-on-year in 2025 and 2026, making it a serious worry for advertisers.

Standard IP blocklists don't work against SIVT because the IPs keep changing and look genuine. DIY tools simply can't keep pace. Managed services that use behavioural analysis, device fingerprinting and human checking are the only effective defence. They also cover Performance Max, where Google's API restrictions block third-party IP blocking, a critical gap that leaves many advertisers vulnerable.

Why Managed Protection Beats DIY Tools

DIY click-fraud tools, like IP blocklists and simple analytics filters, are cheap but limited. They can't block SIVT that uses residential proxies, they don't work on Performance Max (Google blocks PMax API access), and they need constant manual updates. Managed protection services, on the other hand, offer:

• Real-time detection and blocking across all channels, including PMax, using proprietary algorithms and human analysis.
• Automatic refund recovery from Google, saving you time and boosting your success rate.
• Adaptation to new fraud patterns such as AI-generated traffic, which self-service tools fail to catch.
• No annual lock-in contractsso you can scale your protection up or down as needed.

If you’re spending over £8,000 (or $10,000) a month on ads, managed protection almost always funds itself through recovered spend and improved campaign performance. It’s an investment in keeping your data clean and your budget efficient.

Frequently Asked Questions