Starting August 17, 2026, Google Ads is changing how Smart Bidding works for campaigns that are limited by budget. Right now, budget constrained campaigns often beat their Target CPA or Target ROAS. After August 17, automated bidding will aim at the exact target you set instead. If your target is set loosely, your cost per lead can drift up to meet it. Google will not adjust your targets for you, so check them before the change (Google Ads Help, 2026).

What Are the Google Smart Bidding Changes on August 17?

Google announced that its bidding systems will change how budget constrained campaigns behave. Today, when a campaign is marked "Limited by budget," Smart Bidding often delivers a better cost per lead than the target you set. Google says this bidding behavior is confusing and makes results unpredictable when you change budgets. So after August 17, your smart bidding strategy will optimize consistently toward your stated target, whether that is Target CPA or Target ROAS (Google Ads Help, 2026).

In plain words: right now Google sometimes hands you leads cheaper than you asked for. Soon it will give you exactly what you asked for. That makes what you ask for matter a lot more.

Google was clear about a few things in its FAQ. The auction itself is not changing. Your budget limits will still be respected, so this bidding change does not raise your spend on its own. And Google will not touch your bidding targets or budgets automatically. Reviewing them is on you (Google Ads Help, 2026).

Why Do These Bidding Strategies Changes Hit Small Budgets Hardest?

Because almost every local service business runs a budget constrained campaign. Big brands with open budgets will see no change at all. Google confirmed that campaigns without budget constraints already scale to their targets and will keep doing so.

But if you run Google Ads at 30, 50, or 100 dollars a day, there is a good chance your account shows "Limited by budget" right now. Many owners use a low daily budget as a brake on ad spend, set a loose target, and let automated bidding do its thing. That setup quietly worked in your favor. The actual performance was often better than the target.

Run the math on a 50 dollar a day budget. At 55 dollars per lead, 1,500 dollars a month buys you about 27 leads. If bids drift toward an 80 dollar target, that same budget buys about 18. Same money, nine fewer chances at a job, just because a number in your Google Ads account was set loosely a year ago.

Which Automated Bidding Strategies Does the Bidding Change Affect?

The change applies to Target CPA and Target ROAS across most campaign types, including Search campaigns and Performance Max campaigns. It also covers Target CPC on Demand Gen campaigns. It does not touch manual bidding, Target Impression Share, or campaigns that are not limited by budget. Google also said Smart Bidding Exploration is generally unaffected, since Smart Bidding Exploration works best with open budgets anyway (Google Ads Help, 2026).

One more group can relax: if you use Maximize Conversions or Maximize Conversion Value without a target attached, nothing changes. Those bidding strategies already spend your full budget to get as many conversions, or as much conversion value, as possible. That is exactly why Google points budget-limited advertisers toward them as an option.

What Should You Do Before August 17?

Google's own advice is to review every campaign showing "Limited by budget" before the date, especially the ones beating their targets. Here is the 15-minute version for a busy owner:

Common Questions About Smart Bidding

What is Smart Bidding on Google?

Smart Bidding is Google's name for automated bidding that uses auction time bidding signals, like device, location, and time of day, to set a bid for every single auction. Instead of manual bidding on keywords, you give Google Ads a goal, like a Target CPA, and the system bids toward that goal using your conversion data and campaign goals.

Do bid adjustments work with Smart Bidding?

Mostly no. With Target CPA, most bid adjustments are ignored because the system already weighs those signals on its own. Device bid adjustments of minus 100 percent still work if you want to shut off a device completely. This is one more reason the target itself is the lever that matters.

What are the new updates in Google Ads in 2026?

The August 17 change to target-based bidding strategies is the big one for small accounts. Google is also auto-upgrading broad match campaigns to AI Max for Search starting September 1, and it published its playbook for moving Local Services Ads into Performance Max. The pattern is clear: more automation, fewer manual controls, and higher stakes on the few settings you still own.

Is $20 a day good for Google Ads?

It can be, in less competitive trades and towns, but 20 dollars a day is almost guaranteed to be budget constrained. That means this change applies to you. With a small budget, a tight target and clean conversion tracking are not optional. They are the whole game. If leads cost 50 dollars in your market, 20 dollars a day means roughly one lead every two or three days, so every dollar of ad spend has to land. Your ads also do not work alone: people click, then check your reviews and your site before they call. If you have not already, read how to get more Google reviews and make sure your local SEO foundation backs up the money you spend on clicks.

The Bottom Line for Contractors

This is not a scary change. It is a quiet one, and quiet changes are the ones that cost money. Since 2013 we have watched Google Ads take more decisions out of advertisers' hands, and most of the 5,000+ local businesses we have worked with never hear about changes like this until their cost per lead creeps up and nobody knows why.

Fifteen minutes before August 17 beats three months of wondering. Check the "Limited by budget" label, check your real cost per lead, and make your targets tell the truth. If you would rather have someone watch this stuff for you, that is literally what we do all day.