Google Changed How Your Bids Work on August 17 (Most Advertisers Haven't Noticed)

On August 17, 2026, Google Ads changed the behavior of its target-based bid strategies: Target CPA, Target ROAS and, for Demand Gen campaigns, Target CPC. The change was announced in the Google Ads help center and picked up by trade press during August, and it affects one specific but very common group: campaigns that are limited by budget.

If none of your campaigns has shown the "Limited by budget" status in the last 12 months, you can stop reading: nothing changes for you. If some have, this update can move your real costs, and it deserves ten minutes of your attention.

What actually changed

Until now, a budget-limited campaign with a target-based strategy did something quietly favorable: since it could not enter every auction, it concentrated your limited budget on the cheapest, most efficient auctions. The practical result was that many of these campaigns performed clearly better than their configured target. A campaign with a 10 euro Target CPA might deliver conversions at 5 or 6 euros.

Since August 17, the system optimizes consistently toward the target you configured, whether the campaign is limited by budget or not. In plain terms: if you told Google "I accept paying up to 10 euros per conversion", Google now takes you at your word, even when it used to get them for you at 6.

Who is affected

• Campaigns using Target CPA or Target ROAS (and Target CPC in Demand Gen) that were limited by budget at any point in the last 12 months.
• All the channels where these strategies run: Search, Shopping, Performance Max, Demand Gen and Travel.
• Campaigns inside portfolio bid strategies and shared budgets are included too.

Not affected: manual CPC, Target Impression Share, Target CPM, or Maximize Conversions and Maximize Conversion Value without a target attached.

The trap: a target you set casually is now a real instruction

Many accounts set their Target CPA months or years ago, often as a loose "acceptable ceiling" rather than a precise goal, and then forgot it because the campaign kept beating it. That gap between your configured target and your real performance is exactly what this change closes, in Google's favor. The looser your old target was, the more room your costs now have to drift up toward it.

What to do this week

1. List every campaign that showed "Limited by budget" in the last 12 months. The status column in the Campaigns view shows it.
2. For each one, compare the real CPA (or ROAS) of the last 30 to 90 days against the configured target.
3. Where the real number is clearly better than the target, tighten the target toward the real number. Google itself released a Bid Target Adjustment Tool on July 6 for exactly this review.
4. If a campaign is permanently budget-limited, consider whether the budget itself is the real problem: either raise it or tighten the target, but do not leave a loose target with a capped budget.
5. After adjusting, wait one or two full conversion cycles before judging the result. Bid strategies need that time to stabilize.

The honest summary

This is not a scandal; it is Google aligning behavior with what advertisers literally configured. But it quietly converts old, casual targets into binding instructions. The accounts that get hurt will be the ones nobody is looking at. Check yours: it is a ten minute review, and the sources are Google's own August 2026 help center announcement and its July 6 adjustment tool.