Marketers Keep Falling for the Same Q4 Trap

Every October, marketing leaders repeat three mistakes so predictable you could set a calendar by them. None require a bigger budget. All require nerve.

Every fall, the same conversations start happening. How much should we put behind brand? Where should we spend the rest of the media budget? Do we commit now or wait to see how the quarter plays out?

They are reasonable questions. The problem is that marketing teams often end up having the same conversations, making the same assumptions and getting the same results. Before long, brand-building media is harder to justify, performance media is costing more, and the questions about where the budget went are coming too late.

Going into Q4, the biggest opportunities are not always about finding more budget. Sometimes they are about taking a harder look at the decisions already being made, like how you are proving the value of brand media, how your media dollars are actually being handled and whether waiting to commit is costing you more than you realize.

The short answer: the three Q4 marketing mistakes CMOs keep making are pitching brand without tying it to a number the CFO tracks, leaving agency compensation unexamined, and committing budget only after Q4 media costs have already climbed. None of them takes more money to fix.

The brand argument nobody has updated

The case for brand investment has been an uphill argument for so long that marketers have stopped expecting to win it outright. According to Gartner, 84% of companies are caught in what the firm calls a brand doom loop, a cycle in which underfunded measurement produces unclear impact, unclear impact breeds skepticism, and skepticism starves the next budget before it is even proposed. Gartner takes it one step further: by 2027, more than 40% of CMOs who keep pushing for larger brand budgets will lose influence with the C-suite because they can't demonstrate the returns, however sound the case behind them.

The issue is that brand value still is not being communicated in a way that holds up when budgets are on the line. The marketers who are changing that have stopped asking for brand dollars in the language of awareness and started asking in the language finance already speaks. If your Q4 brand case doesn't already connect that investment to a number the CFO tracks, there is still work to do. The stronger the connection to business outcomes, the easier it is to make brand investment part of the budget conversation.

So what does a stronger brand case look like in practice? We'd start with two moves.

• Define what brand media is expected to deliver before it runs. Agree up front on the lift brand or awareness media should produce, starting with an increase in your organic base run-rate (the leads or sales you'd get with no paid media running), then a measurable rise in branded search demand, then improvement in downstream metrics like conversion rate and cost per acquired customer. When each of those has a target attached, brand gets judged on the same scorecard finance already uses for everything else.
• Run a marketing mix model to measure that lift. An MMM uses your historical spend, sales and outside factors like seasonality and pricing to estimate how much each channel, brand media included, actually contributed to revenue. Because it works from aggregate data, it isn't thrown off by cookie loss or last-click attribution, and if a full model feels like too big a lift before Q4, we'd scope a lighter version on the data you already have so you walk into planning with a defensible read on brand's contribution.

We're doing this work with our clients right now, partnering with MMM specialists like Miix Analytics and building the models and forecasts that let their brand budgets go into planning season backed by the same kind of evidence finance expects from every other investment.

The transparency question everyone is still avoiding

It has been a hard year for confidence in how media gets bought. Forrester found that 81% of US B2C marketing executives plan to increase their use of principal media buying in 2026, even as the practice becomes harder to audit from the outside. The same year produced a court filing that exposed one holding company generating roughly $1 billion annually in non-product-related income tied to rebate-linked arrangements, according to eMarketer's reporting on the case. None of this is hidden. Most of it is public record.

And yet most marketing teams have not touched their agency contracts. If you have not asked, in writing, exactly how your media partner is compensated on every dollar you send them, including what happens inside principal media deals, fall is the wrong season to keep postponing that conversation. It is the most expensive quarter of the year to not know the answer.

Getting that answer doesn't take a contract renegotiation, and we'd start with two steps.

• Get the compensation model in writing. Ask your agency to list every way it earns on your account, including fees, media markups, rebates, platform incentives and any margin on principal media, and ask for the vendor invoices behind the media line so you can check the numbers against the plan.
• Put guardrails on principal media. If you allow it at all, make it opt-in, have it labeled clearly on every media plan, and hold it to the same KPIs as the rest of your buy. Forrester recommends capping principal media at 10% to 20% of total media budget, which is a sensible ceiling to write into your agreement.

It's also how we run our own business: a flat fee, no markups and no media commissions, with clients keeping full ownership of their ad accounts and data, so the answer to every one of these questions is already on paper.

Paying the highest price of the year, on purpose

The data on Q4 media costs does not require interpretation. AdRoll's Q4 2025 State of Digital Advertising Report found display retargeting CPMs rose 11% year over year as brands competed for an earlier holiday season. Anyone who has ever tried to buy media in November already knows this firsthand. It is, reliably, the most expensive quarter to be in market, and the brands waiting for certainty before they commit are the ones paying for the privilege of being sure.

Across the brands we work with, the ones who come out ahead made their placement decisions in the summer, while everyone else was still waiting to see what the market would do. By November, the market has already decided to charge more.

If your Q4 plan isn't locked yet, there's still room to limit your budget exposure, and we'd focus on three things.

• Build your audiences before the auction gets crowded. AdRoll's same Q4 2025 report found prospecting CPMs rose just 2% year over year while retargeting rose 11%, so the cheaper path is to fund prospecting in September and October and fill your retargeting pools before November pricing hits.
• Lock in rates on the placements that matter most. Negotiate premium inventory such as CTV, out-of-home and high-demand publishers as early as you can, and get rate commitments in writing so the plan you approved is the plan you pay for.
• Plan in scenarios with pre-approved triggers. Agree a base plan along with the conditions under which you'd scale up or pull back, so the team can move in mid-November without waiting on sign-off.

This is the planning rhythm we run with our clients, building Q4 plans and forecasts in the summer that show what each budget scenario should deliver before the first dollar goes out.

Three questions to ask before Q4 costs climb

None of these three mistakes requires a bigger budget to fix. They come down to asking the right questions early enough to do something with the answers. If you have a good agency partner, they should be asking these questions on your behalf. Is the case for brand strong enough? Do you have full transparency into how your media dollars are being spent? And are you making those decisions before Q4 costs start climbing?

Because once the quarter is underway (we're here now), your options get narrower. There is less room to shift budget, negotiate better terms or rethink the plan. Asking these questions earlier gives you more control over where your money goes and a better chance of making it work harder when it matters most.

The bottom line: this year's Q4 winners will not be the biggest spenders. They will be the ones willing to ask three uncomfortable questions before the quarter asks them first.

If any of this sounds familiar, let's talk before the quarter gets away from you. There is still time to act.

Sources: Gartner, Forrester, eMarketer, AdRoll.