Google’s 10% budget dial isn’t a hard cap

Google is giving advertisers more buttons to steer campaign budgets—but the new controls stop short of giving them an enforceable cap. The rollout, announced on October 14, lets marketers prioritise channels and set a low-priority spending percentage.

01 · What the new controls do

Under channel prioritisation, advertisers can mark eligible channels as “High priority” or “Low priority”. Google’s systems aim to spend on preferred channels first, within bidding objectives, before moving to lower-priority inventory. A retailer running Search ads could keep Google Search as high priority while treating Search partners or the Display Network as secondary, instead of switching those networks off entirely.

The companion feature, budget allocation, lets a marketer specify a percentage of the average daily campaign budget for a low-priority channel. On a campaign with a ₹1 lakh daily budget, a 10% allocation tells the system to aim for no more than ₹10,000 a day on that channel.

02 · But it is best-effort, not a hard ceiling

Google’s language matters here: the percentage works on a “best-effort” basis. Daily spending can exceed the figure set, the allocation resets daily, and it is calculated against the average daily budget rather than actual expenditure. A stated 10% is a preference, not an accounting lock.

03 · Where the granularity ends

The controls also vary by campaign type, and Performance Max remains an important exception:

• Search: priority across Google Search, Search partners and Display, plus percentage budget allocation.
• Shopping: supports Search and Search partners.
• Demand Gen: gets prioritisation but not percentage-based budget allocation.
• Performance Max: Search, YouTube, Maps, Gmail and Discover stay bundled as “Google channels”; you cannot split separate budgets inside that bundle.

Priority labels may not move much money when a campaign is not budget-constrained. With target cost-per-acquisition or return-on-ad-spend bidding, Google’s systems continue optimising against those performance targets, so the algorithm retains significant discretion.

04 · Why it matters for Indian marketers

The update continues Google’s shift from opacity toward more visibility and action. Channel performance reporting for Performance Max arrived in 2025 and expanded through the Ads API in January 2026; these controls give advertisers a way to use that data.

Google is also encouraging marketers who had opted out of Search partners or the Display Network to test them again with limited exposure. That can unlock profitable inventory—or quietly steer spend back into networks a brand had already rejected. The setting alone does not decide which.

One date to watch is February 2027, when Search campaigns using Display Expansion migrate to the new model. Google warns spending patterns could change, and suggests marking Display as low priority with a 50% daily allocation as a rough equivalent—still subject to the same best-effort caveat.

The marketing take: Treat these settings as steering, not finance locks. The real test is whether channel-level return improves without making spend less predictable.

Source: Indian Advertising Media & Marketing News – exchange4media

Mad About Marketing Desk The strategists and writers at Mad About Marketing, writing up what we see in the work every week.