Google Ads channel priorities: budget limits explained

Google Ads is rolling out channel prioritisation and budget allocation controls. For ecommerce advertisers, the useful distinction is between choosing where spend goes first and setting a spending boundary that Google aims to respect.

Google’s 14 October announcement introduces High and Low priority settings for channels or channel groups. High priority inventory is funded first within applicable bidding targets. In Performance Max, Google’s own surfaces are grouped together: this does not give you a separate YouTube budget dial.

What a budget allocation actually limits

The Help Centre says an allocation for a Low priority channel is a percentage of the average daily budget, not actual spend. It is a best-effort limit and may be exceeded. Unused or excess amounts do not carry over to the next day.

Priority alone generally will not change distribution for target-based campaigns that are not budget constrained; allocations still apply. All channels default to High priority. The rollout began progressively on 15 October, so availability varies.

Check the campaign type before planning a test

Current documentation says Demand Gen supports prioritisation but not budget allocation. Google Ads API and Editor support are described as coming soon. Account defaults can be overridden for a campaign or shared budget; a shared-budget allocation applies across that pool.

Our recommendation is to record the present settings and channel results before changing anything. Write down what the test should answer, the person responsible and the review date. Change one control at a time where practical, and compare business outcomes as well as the share of spend. A smaller allocation to a channel is not itself evidence of better performance.

Put the February Display change on the calendar

Google says the existing spend allocation behaviour for Search campaigns with Display enabled will go away in February 2027. Its announced setting for retaining the current configuration is Display Network at Low priority with a 50% allocation.

That is a migration setting, not our recommendation to put half a store’s advertising budget into Display. Ask whoever manages the account to identify affected campaigns and check the current help page before applying it. Record any shared budgets and campaign overrides so a change at account level does not become an unexplained shift later.

For BFCM, review availability early and avoid assuming a new control will appear just before a promotion. Keep the original settings and a clear reason for each test; leave a successful campaign alone unless there is a specific problem to solve.