Google Shows Where Your PMax Budget Goes. Not What It Bought.

Google rolled out a Performance Max channel performance timeline in April 2026 that shows weekly spend across Search, YouTube, Display, Discover, Gmail, and Maps. Across 61 advertiser accounts studied by BMG360, the average PMax campaign puts roughly 58% of spend on Shopping, 34% on Search, and 4% each on YouTube and Display. The timeline finally shows where the money goes. It still refuses to attribute clicks, cost, or conversions at the placement level.

That matters because for three years Performance Max has been a campaign type you approve a budget for and then explain to your CFO in vague gestures. The new chart closes one of the big information gaps. But most of the optimization advice still circulating was written for the black box version, and a lot of it stops making sense once you can actually see the split.

This is the follow-up to our Google Ads strategy guide, zooming in on the one campaign type that eats the biggest share of most accounts and shows the least in return.

What the new chart actually tells you (and what it doesn't)

The channel performance timeline lives under Insights and Reports inside a Performance Max campaign. You pick a date range, and Google draws a stacked area graph of spend across the six channels week over week. It's the same data Google opened up at the API level in January 2026, now with a UI on top.

What it shows: spend allocation by channel, how that allocation shifts over time, and which channels are scaling up or down as your campaign learns. You can finally answer the question "how much of my PMax budget is going to YouTube this week" without scraping placement reports and guessing.

What it doesn't show, and this is the part we covered when the chart first shipped: the placement report still doesn't attribute cost, clicks, conversions, or conversion value to individual placements. You know your campaign spent $4,200 on Display last week. You don't know which sites, which ads on those sites, or which of those sites drove any of your conversions. Google's language here is careful. The official FAQ calls it channel-level attribution, not placement-level attribution, and the difference is the entire optimization conversation.

So treat the timeline as a budget allocation report, not a performance report. It tells you where your money went. It still doesn't tell you whether that money worked.

The 58/34/4/4 benchmark most advertisers didn't have

Until this year there was no industry number for typical PMax spend allocation. Advertisers shared rumors. Agencies had their own accounts to look at. Everyone assumed their split was weird.

BMG360 ran the math across 61 accounts and published a clean benchmark: 58% Shopping, 34% Search, 4% Video, 4% Display. For ecommerce accounts specifically, Store Growers recommends 60-80% Shopping as the healthy range, and they flag the same thing agencies have been saying quietly for a year. If Display or YouTube is eating more than about 10% of your PMax spend, your product feed probably needs work before you touch anything else.

The reason is mechanical. PMax allocates toward the channel where it can find signal fastest. Shopping feeds with rich attribute coverage, good image assets, and clean GTINs give it that signal. Feeds with missing attributes, bad titles, or blocked categories force the system to spend elsewhere because Shopping can't find a foothold. When your YouTube allocation creeps up, that's often the system telling you something about your feed, not about your video creative.

Pull up the new timeline for your top PMax campaign. If you're ecommerce and you're under 55% Shopping, the first fix isn't in the campaign. It's in your Merchant Center feed. Check your item-level status, your disapproval rate, and whether you've filled out attributes like gtin, brand, color, and size for the SKUs that should be doing the volume.

Why the 4% on YouTube is the section worth auditing

Most of the transparency arguments around PMax focus on the big numbers. Shopping and Search between them account for over 90% of spend in the average account, and that's where the obvious money is. But the small allocations are where the drag hides.

YouTube and Display each sit around 4% on average. In an account running $50,000 a month through PMax, that's $4,000. Four grand a month, every month, going to placements you can't see, against audiences you didn't pick, with creative Google assembled from your asset groups. If the campaign is converting at your target ROAS, fine. The problem is that you can't prove the YouTube and Display spend contributed, because Google won't attribute at the placement level. It might all be incremental. It might all be wasted. The average account has no way to know.

What you can do is sanity-check the creative. Pull your asset group, find the video assets PMax is using, and watch them the way a potential customer would. Many accounts are running the auto-generated video Google stitches together from your product feed and logo. That video is, to put it gently, not something you'd pay to show someone. If you haven't uploaded a custom 15-second video asset to your PMax campaign, Google is filling the YouTube 4% slot with the default placeholder. That's the cheapest fix in paid media right now. Upload one decent video. Your YouTube spend becomes spend you'd be willing to defend.

The brand exclusion check Google won't volunteer

Here's the part most PMax optimization guides still skip. If you run Performance Max without brand exclusions, Google will happily spend your budget on your own branded search terms, claim the conversions, and count itself a hero. Optmyzr studied 503 accounts and found that 91.45% had keyword overlap between Search and PMax, and across the 5,768 Search campaigns they examined, 56.29% were bleeding keywords into a PMax campaign in the same account.

This isn't a rounding error. When your PMax ROAS looks amazing and your brand Search campaign has quietly lost volume, that's usually the mechanism. PMax is lifting branded conversions that would have happened anyway, reporting them as incremental, and your dashboard tells you PMax is the best thing in the account.

The fix is two-part, and Google doesn't surface it in the campaign setup flow. First, add your brand terms to the campaign-level brand exclusion list. Second, keep a dedicated branded Search campaign running in parallel so the demand you don't want PMax serving gets served by something you can audit. On any account over $10k/month on PMax, I'd audit this before touching bid strategies.

One hedge. Brand exclusions in PMax match on brand queries, but the match quality has been inconsistent. A lot of practitioners on Optmyzr's roundups have reported seeing brand queries leak through even with exclusions in place, especially for multi-word brands. Verify with search term reports weekly, not monthly.

A 30-minute PMax audit using the new chart

Here's the flow I'd run on any account this week. It uses the April 2026 timeline as the entry point and covers the three levers most accounts are leaving on the table.

Minute 0-10. Read the timeline. Open your highest-spending PMax campaign, go to Insights and Reports, and pull a 60-day view on the channel performance timeline. Sixty days smooths out the anomalies. Note the approximate percentages. Compare to the 58/34/4/4 benchmark. If Shopping is under 55%, or if Display plus YouTube is over 12%, flag it.

Minute 10-20. Check the feed. If Shopping is underweight, open Merchant Center. Check item-level disapprovals, attribute coverage on your top 100 SKUs by revenue, and whether your most important categories are actually eligible to serve. Nine times out of ten, rebalancing PMax spend starts here, not in the campaign.

Minute 20-30. Check brand overlap. Pull the search terms report for the last 30 days. Count branded queries. Cross-reference with your branded Search campaign's search terms. If the same queries appear in both, either add brand exclusions to PMax or accept that your attribution is partially fiction. Both are choices. Only one is honest.

That's the audit. No new tools, no spreadsheets, nothing Google won't let you see. The timeline made this workflow possible three weeks ago. Most accounts still haven't used it.

A quick note on scale

One thing the optimization discourse is starting to admit out loud: PMax reliability gets worse as spend gets bigger. Practitioners on PPC.land and elsewhere have been documenting performance degradation on accounts running over roughly $100k/month through a single PMax campaign. The system seems to optimize well in the $5k-$50k range, wobbles above $75k, and gets noticeably inconsistent past $100k.

Ginny Marvin, Google's Ads Product Liaison, has been fielding these threads publicly, which is itself a signal that the pattern is real enough to warrant official response. The practical takeaway: if you're scaling past $75k/month on a single campaign, consider splitting into multiple PMax campaigns by product category or margin tier before performance starts drifting, not after.

FAQ

Does the April 2026 channel timeline include placement-level data?
No. The timeline reports spend and performance at the channel level (Search, YouTube, Display, Discover, Gmail, Maps). Individual placements, specific sites, and individual apps still aren't attributed with cost or conversion data.

What's a healthy Shopping allocation for ecommerce PMax?
Store Growers puts the healthy range at 60-80% of PMax spend on Shopping for ecommerce accounts. Anything under 55% usually points at feed quality issues before campaign settings.

Should I run a separate branded Search campaign alongside PMax?
Yes, on any account over roughly $10k/month in PMax spend. Without brand exclusions plus a dedicated branded Search campaign, PMax tends to claim credit for conversions that branded Search would have closed anyway, which inflates PMax ROAS and starves Search budget over time.

By Notice Me Senpai Editorial