Google Ads Target-Based Bidding Changes: Agency Checklist for August 17, 2026

Direct answer

Before August 17, audit every campaign marked Limited by budget that uses Target CPA, Target ROAS or Target CPC for Demand Gen. Record current targets, actual CPA or ROAS, budgets and conversion lag before changing anything. Google will not alter targets or budgets automatically. After rollout, hold major transitions for one to two conversion cycles and treat August 17-31 forecasts cautiously.

Which campaigns are affected by the August 17 change?

Google says the update applies when both conditions are true:

1. the campaign or constrained budget group is marked Limited by budget; and
2. it uses Target CPA, Target ROAS, or Target CPC for Demand Gen.

The current Google Ads FAQ lists Search, Shopping, Performance Max, Demand Gen, and Travel campaigns managed in Google Ads or Search Ads 360, plus Demand Gen campaigns managed in Display & Video 360. Google says the update affects online and offline conversion sources, including click-through, view-through, and engaged-view conversions where applicable.

The change does not apply merely because a campaign uses automation. Google says Manual CPC and Target Impression Share are not affected, and Smart Bidding Exploration is generally outside this update because it is designed for unconstrained budgets.

Use the Status column, not memory or a spreadsheet from last month, to identify the current scope. Google's Limited by budget guidance defines the status as an average daily budget that is lower than the recommended amount for the available traffic under the campaign's current settings.

What should an agency record before making a decision?

Take one account-level snapshot before changing targets or budgets. For every affected campaign, record:

• account, campaign, campaign type, bid strategy, and budget-group name;
• current Limited by budget status and observation time;
• current daily budget, target CPA or target ROAS, and any target history;
• actual CPA or ROAS over a window that excludes the current conversion-delay period;
• conversion goal set, primary actions, attribution settings, and conversion lag;
• recent spend, conversion volume, conversion value, and impression context;
• whether the target is intentionally looser or tighter than recent actual performance;
• the client business constraint and approval owner; and
• any other scheduled migration, experiment, promotion, or tracking change.

Google will not automatically change the campaign's target or daily budget. The agency must decide whether the current target still represents the client's business goal.

Do not treat Google's adjustment suggestion as an instruction to maximize volume. A campaign can remain budget constrained because the client has a real cash, margin, stock, lead-quality, or operational limit.

Original artifact: August 17 bid-change control sheet

Use one row per campaign or shared budget. Keep observation, decision, execution, and evaluation separate.

This sheet prevents a common failure: changing the target, budget, conversion setup, creative, and landing page together, then attributing every movement to the bidding rollout.

Should an agency change the target before August 17?

Google says campaigns that have been outperforming their stated target can begin delivering closer to the target after the change. Its example is a Target CPA of $10 with recent actual CPA of $5: without an adjustment, delivery can move closer to the stated $10 target.

That does not mean every overperforming campaign should copy its recent actual CPA into the target field. Use three questions:

1. Does recent actual performance exclude the conversion-delay period and use the correct primary goals?
2. Is the recent result stable enough to represent a business expectation rather than a short promotional or seasonal window?
3. Would maintaining that efficiency target restrict volume the client is prepared to buy?

If the business wants to maintain recent efficiency, document the lag-adjusted evidence and the approved target. If the stated target already reflects the client's acceptable economics, keeping it can be valid even when recent results are better. If the account lacks clean conversion data, do not manufacture precision from the adjustment tool.

Google says the Bid Target Adjustment Tool is deploying through campaign settings. If it is not visible, that absence does not remove the need to review the campaign; agencies can inspect and update targets manually.

How do shared budgets and portfolio strategies change the workflow?

Google says actions for portfolio bidding and shared budgets must be taken at the portfolio or shared-budget level. For portfolio strategies with non-shared budgets, the update applies only to campaigns that are budget constrained. For constrained shared budgets, Google says the effect is distributed uniformly across the group.

That makes campaign-only change logs incomplete. Record the portfolio strategy, shared-budget membership, all affected campaigns, and the owner of the group-level decision. Before splitting a group, confirm that the structural change is justified independently of the August 17 rollout.

Google says campaign total budget behavior does not change; those campaigns continue to maximize budget utilization over the defined period unless the campaign is target constrained.

What should agencies avoid during the rollout?

Google specifically advises against applying data exclusions or new bid limits solely because of this update. Those actions can create additional performance fluctuations.

Also avoid stacking unrelated changes into the measurement window. The separate AI Max September upgrade checklist covers a different migration. Keep its change record separate even when the same Search account is affected by both events.

Do not assume an immediate change proves a permanent effect. Google recommends waiting one to two conversion cycles before evaluating or making campaign transitions. An agency with a seven-day conversion cycle needs a different hold window from one with same-day ecommerce conversions.

How should performance be evaluated after August 17?

Use a predeclared observation window and first-party account data. Compare the campaign with its own lag-adjusted baseline and approved target. At minimum, record:

• actual CPA or ROAS against the stated target;
• spend and conversion volume or conversion value;
• conversion lag and late-arriving outcomes;
• budget status and missed-demand indicators;
• channel allocation changes for multi-channel campaigns;
• goal or attribution changes; and
• promotions, stock, site incidents, pricing, creative, and landing-page changes.

Google warns that Performance Planner forecasts can have inaccuracies during the August 17-31 transition. Use the planner as a scenario tool, not a guaranteed prediction. Google's general Performance Planner documentation says forecasts refresh daily and use recent auction, seasonality, competitor, and landing-page information.

Budgets still constrain billing. Google's spending-limit documentation explains the daily and monthly limits for most campaigns. The bidding change does not authorize an agency to exceed a client-approved budget.

How does this relate to competitor-ad research?

It mostly does not. A competitor's visible Google ad can show creative, advertiser, payer, region, and date context, but not its bid strategy, budget status, target, conversion lag, or account economics. Use the Google Ads Transparency Center research guide for the public evidence layer.

For cross-platform creative patterns, the Meta and Google ad-intelligence framework keeps observable evidence separate from private campaign conclusions. Do not use ad longevity or repetition as proof that a competitor's bidding setup is effective.

What can public ad data not prove?

Public ad data cannot prove a competitor's budget, Limited by budget status, target CPA, target ROAS, Target CPC, bid adjustments, shared-budget structure, portfolio strategy, conversion goals, attribution model, conversion lag, clicks, conversions, revenue, profit, or incrementality. A visible ad cannot establish whether the August 17 change affects that advertiser or caused any performance movement.

Frequently asked questions

Will Google automatically change budgets or targets on August 17?

No. Google's current FAQ says it will not automatically adjust daily budgets or campaign bid targets.

Does the change affect every Smart Bidding campaign?

No. The documented scope is budget-constrained campaigns using Target CPA, Target ROAS, or Target CPC for Demand Gen in the listed campaign and management products.

Should agencies add a data exclusion for the rollout?

Not solely because of this change. Google says reactive data exclusions or new bid limits can create additional fluctuations.

How long should an agency wait before judging results?

Google recommends waiting one to two conversion cycles. Define the dates from the account's actual conversion lag instead of using one universal number of days.

Can Performance Planner be trusted during the transition?

Use it cautiously. Google warns that forecasts may be inaccurate from August 17 through August 31 while planning tools are updated for the new behavior.

Does a public Google ad reveal whether the campaign is affected?

No. Public ad evidence does not expose the campaign's budget status or bidding configuration.

A restrained next step

Use the control sheet for the client's private Google Ads account and approval trail. If the agency also needs a separate workspace for observable competitor creative from public Meta and Google sources, the Advertisng Ad Library can support that research layer. It does not connect to the client's ad account or replace first-party bidding analysis.

Primary sources

1. Google Ads Help: Frequently asked questions about changes to Target-based bid strategies, reviewed August 16, 2026.
2. Google Ads Help: Fix Limited by budget bid adjustments, reviewed August 16, 2026.
3. Google Ads Help: Your guide to Smart Bidding, reviewed August 16, 2026.
4. Google Ads Help: About Target ROAS bidding, reviewed August 16, 2026.
5. Google Ads Help: About Performance Planner, reviewed August 16, 2026.
6. Google Ads Help: About spending limits, reviewed August 16, 2026.