Google Ads Is Changing Target Bidding on August 17, 2026: What Canadian Merchants Need to Do First

01. What Actually Changes on August 17

Today, when a campaign carries a Limited by budget status and uses a target-based bid strategy, Google's system often optimizes past your stated target. You asked for a $10 CPA, the constrained budget forced it to cherry-pick the cheapest conversions, and you got $5. Nice surprise. The cost of that surprise is volatility: adjust the budget and performance swings unpredictably, because the campaign was never really optimizing to your number.

After August 17, 2026, those campaigns optimize consistently toward the target you entered, budget-limited or not. Google's own example is direct: a Target CPA of $10 with recent actual performance of $5 will begin delivering closer to $10. Google's recommendation is to update the target to $5 if you want to keep the $5 performance.

• July 6, 2026. The Bid Target Adjustment Tool became available in Google Ads. It shows historical performance per campaign and lets you apply an updated target in one click.
• August 17, 2026. The bidding behaviour changes. Google will not automatically adjust your targets or your budgets. Inaction is a decision.
• August 17 to August 31, 2026. Google advises caution with forecasts from planning tools like Performance Planner during this transition window, since they are being updated to reflect the new behaviour.

One clarification worth stating plainly, because it is being misreported: the auction is not changing. This is a bidding change only.

02. Which Campaigns Are Affected

Two conditions have to be true together. The campaign must be limited by budget, and it must use an affected target-based bid strategy. Campaigns with unconstrained budgets already behave the new way and will not change at all.

For multi-channel campaigns like Performance Max and Demand Gen there is a second-order effect: you may also see spend shift between channels inside the campaign, because the system is now allocating against your stated target rather than the tighter one it had discovered. If you run Performance Max on a constrained budget, watch channel distribution, not just the headline ROAS.

03. What Most People Get Wrong About This

Three misreadings are circulating, and each one leads to the wrong action.

Mistake 1: assuming it means Google will spend more of your money.

It does not. Google is explicit that daily and monthly budget limits are always respected and the change does not directly increase spend. The exposure is efficiency, not spend. The same budget can simply buy worse conversions, because the system is now permitted to relax to the looser target you entered. If you go hunting for a spend spike you will conclude nothing happened, while your blended ROAS quietly slides.

Mistake 2: assuming you are safe because you are happy with your targets.

The question is not whether you are happy with the target. It is whether the target matches what you are actually getting. A target that has been dormant while the campaign overperformed is not a target, it is a ceiling you forgot about. Google's guidance is that if your current bid targets genuinely reflect your business goals, no change is required. That is true and it is also the trap, because the target most accounts have on file was set for a different budget, a different margin, and often a different product mix.

Mistake 3: reacting with bid limits, data exclusions, or a defensive strategy swap.

Google specifically advises against applying data exclusions or new bid limits solely in response to this update, because that causes its own volatility. The correct response is boring: set an accurate target, and give the campaign budget headroom. Reaching for exotic levers here is how a manageable change becomes a bad quarter.

04. The Pre-August 17 Audit, Step by Step

Budget an hour. Longer if you run more than a handful of campaigns.

1. 1. Filter for the exposed set. In Google Ads, filter campaigns by a Limited by budget status and a bid strategy of Target CPA or Target ROAS. Everything outside that set is not affected by this change.
2. 2. Compare target to actual. For each campaign, put the stated target beside the actual CPA or ROAS over the last 30 to 90 days. Flag every campaign where actual is better than target: CPA below target, or ROAS above target. Those are the campaigns that will drift.
3. 3. Quantify the drift. Estimate what happens if that campaign converges on its stated target. A campaign spending $4,000 a month at 550 percent ROAS against a 300 percent target is not a rounding error. Do this before you decide how much attention the account deserves.
4. 4. Open the Bid Target Adjustment Tool. Available since July 6, 2026, it shows each campaign's recent performance and lets you apply a target that matches it. Use it as the fastest way to see the gap, even if you decide to enter a custom number instead of the suggested one.
5. 5. Set the target, then fix the budget. A correct target on a starved budget is still a constrained campaign. Once your target reflects your economics, raise the daily budget so it sits comfortably above average daily spend. That is the whole point of the change: at an accurate target, more budget should now scale volume without wrecking efficiency.
6. 6. Wait before you judge. Google recommends allowing one to two conversion cycles after a target change before evaluating. If your sales cycle is long, that is weeks, not days. Do not panic-revert on day three.

If you run ads across Google, Meta, and Microsoft from one product feed, do this audit on the Google side first and then re-baseline your channel comparisons afterwards. Our multichannel ecommerce advertising guide covers how to keep those channels comparable, and the product feed setup guide covers the plumbing underneath them.

05. Choosing Your Real Target Number

Google offers four responses: keep your target, match it to recent performance, set a custom number, or switch bid strategy. Here is how we think about picking between them.

• Match recent performance when the campaign is genuinely profitable at its current numbers and you simply want continuity. This is the safe default for most budget-limited accounts, and it is the one-click option in the adjustment tool.
• Set a custom target when your margin math gives you a real answer. This is the grown-up option. Take gross margin, subtract fulfilment and payment costs, decide what contribution you need per order, and derive the ROAS. Most SMBs have never done this and are running on a number somebody guessed.
• Keep the target as-is only when you have deliberately decided you want more volume at lower efficiency and your margins can absorb it. That is a legitimate growth choice. It is not the same as doing nothing, even though the button presses are identical.
• Switch to Maximize conversion value only if your budget is truly fixed and you accept fluctuating ROAS. Without a target, efficiency moves whenever budgets move. For a manufacturer or wholesaler with a hard margin floor, that is usually the wrong trade.

The uncomfortable truth underneath all four options: this change punishes accounts that do not know their own unit economics. If you cannot state the ROAS your business actually needs, no bid strategy will save you, because every one of them is just a way of expressing a number you have not decided on yet.

06. Why This Hits Canadian SMBs Harder

Limited by budget is not an edge case in Atlantic Canada, it is the default state. A regional retailer, a wholesaler testing DTC, a manufacturer running Shopping on a modest monthly cap: these accounts are budget-constrained by design, not by accident. That means the exposed population here skews heavily toward the smaller advertisers who have the least slack to absorb an efficiency drop.

The timing compounds it. August 17 lands right as Canadian merchants build BFCM plans. If your ROAS baseline shifts in late August and you do not attribute the change correctly, you will build your Q4 forecast on a number that no longer means what it meant in July. Re-baseline before you plan, not after.

There is a genuine upside for accounts that do the work. The reason budget-limited campaigns were volatile before is that raising the budget broke the efficiency you had. After this change, at an accurate target, additional budget is supposed to scale volume predictably. For a business that has been afraid to increase ad spend because performance got worse every time it tried, that is the constraint being removed. The merchants who reset targets in July and then fund the campaigns properly are the ones who will come out of this ahead of their competitors, who will spend September wondering why ROAS fell.

Paid media is also only one surface. As AI-driven discovery takes share from classic search, the accounts leaning entirely on bidding efficiency are the most fragile. Our guide to GEO and AEO for Canadian ecommerce covers the earned side of that equation, and the ecommerce SEO checklist is where to start if paid is currently carrying all of your demand.

07. Frequently Asked Questions

Sources

• Google Ads Help, Changes to target based bid strategies
• Google Ads Help, Frequently asked questions about changes to Target-based bid strategies