Ad Budgeting: How to Stop Funding the Wrong Half

Ad budgeting is the process of allocating spend across channels, campaigns, and time periods to hit commercial objectives. Done well, it connects marketing investment to business outcomes. Done poorly, it becomes a political negotiation dressed up as strategy, where the loudest channel gets the most money and performance reports are written to justify what was already decided.

Most budgets are not built from first principles. They are last year’s budget, adjusted for inflation, with a new line for whatever channel the CEO read about on a flight. That is not a plan. It is inertia with a spreadsheet.

Why Most Ad Budgets Are Built Backwards

Early in my career I made the same mistake most performance marketers make. I overvalued the bottom of the funnel. The numbers were clean, the attribution was clear, and the cost-per-acquisition looked like proof. It was only years later, running agencies and sitting with the full commercial picture, that I started to question how much of that performance was genuinely created by the advertising and how much was simply captured. Intent that existed anyway, routed through a paid click.

Think about it like a clothes shop. Someone who tries something on is far more likely to buy than someone browsing the rails. But the fitting room did not create the desire to buy. The brand did, the window display did, the recommendation from a friend did. If you only measure the fitting room, you will keep investing in fitting rooms and wonder why fewer people are walking through the door.

That is the core problem with most ad budgets. They are optimised for the point of measurement, not the point of influence. Channels that are easy to measure attract money. Channels that build the conditions for future demand get squeezed. Over time, the pipeline dries up and performance channels look less efficient, so you cut them, and the whole system contracts.

Ad budgeting done properly is part of a broader commercial strategy. If you want to understand how budgeting fits into how growth actually works, the Go-To-Market and Growth Strategy hub covers the full picture, from market entry to channel mix to how brands build durable competitive positions.

What Should Drive Your Budget Allocation?

There is a version of this answer that sounds sensible but is largely useless: “allocate to where you get the best return.” The problem is that return is almost always measured in ways that favour channels already in the plan. You are not measuring return. You are measuring what your attribution model can see.

A more useful starting point is to ask where your growth is actually going to come from. Not where it came from last year. Where it needs to come from next year. That question forces a different kind of thinking.

If your growth target requires reaching people who do not currently know you exist, then a budget weighted towards retargeting and branded search will not get you there. Those channels are excellent at converting warm audiences. They are poor at creating new ones. Forrester’s work on intelligent growth models makes this point clearly: sustainable growth requires a systematic approach to building new demand, not just harvesting existing intent.

The allocation question has three variables worth thinking through honestly:

• Where is the audience you need to reach? Not the audience you have already reached. The one you have not reached yet.
• What does it cost to shift behaviour at each stage? Awareness is cheap per impression and expensive per outcome. Conversion is cheap per click and expensive per new customer.
• What is the time horizon of the business objective? A quarterly revenue target and a three-year market share target require fundamentally different budget structures.

The Performance Trap: When Efficiency Becomes a Strategy

I have sat in budget reviews where a performance channel was delivering a cost-per-acquisition that looked excellent on paper. The marketing director was proud of it. The finance director was happy. And the business was slowly losing market share.

What was happening was straightforward. The brand had spent years building awareness and preference. That equity was now being monetised through performance channels. The performance channels looked brilliant because they were harvesting the output of brand investment made years earlier. But the brand investment had been cut to fund more performance. The equity was depleting. The CPA would eventually rise, and when it did, there would be no brand to fall back on.

This is not an argument against performance marketing. It is an argument against using performance metrics to make strategic budget decisions. Efficiency is a useful operational measure. It is a poor strategic guide. A channel can be highly efficient and strategically irrelevant to where your growth needs to come from.

BCG’s research on brand and go-to-market strategy is useful here. The argument is not that brand and performance are in opposition. It is that they serve different commercial functions and need to be funded accordingly. Treating them as interchangeable is where the budget goes wrong.

How to Structure a Budget That Reflects Commercial Reality

When I was running agencies and managing significant media budgets across multiple clients, the most useful budget frameworks were the ones that started with the commercial objective and worked backwards to the channel mix, rather than starting with last year’s channels and working forwards to a number.

Here is a practical structure worth applying:

1. Anchor to a growth objective, not a spend level

Start with the business objective. Revenue target, customer acquisition target, market share target. Make it specific. Then ask what marketing needs to deliver to support that objective. That gives you a demand signal, not a budget number. The budget is what it costs to meet that demand signal across the channels that can actually reach it.

2. Separate demand generation from demand capture

These are different jobs. Demand generation creates awareness, preference, and intent in people who were not previously considering you. Demand capture converts people who already have intent. Both matter. Neither should be funded at the expense of the other. A useful rule of thumb is to ask what proportion of your target growth comes from new audiences versus existing intent. That proportion should roughly map to your budget split.

3. Apply zero-based thinking to channel allocation

Zero-based budgeting is often discussed as a cost-cutting tool. Applied to media, it is something more useful: a way of forcing honest justification for every channel in the plan. Instead of asking “how much more or less than last year?”, ask “if we were starting from scratch, would we include this channel, and at what level?” It is uncomfortable. It surfaces assumptions that have been baked into plans for years. That is exactly why it is worth doing.

4. Build in a testing budget with real stakes

Most testing budgets are too small to generate meaningful signal and too protected from scrutiny to be honest about results. A test budget should be large enough to matter and governed by clear criteria for what success looks like before the test runs, not after. Post-rationalised test results are not insights. They are confirmation bias with a budget line.

5. Match measurement to the channel’s job

A brand awareness campaign should not be judged on direct conversion. A retargeting campaign should not be credited with creating demand it did not create. The measurement framework needs to match the commercial function of each part of the budget. This sounds obvious. It is routinely ignored in practice, because last-click attribution is easy to implement and politically convenient for performance teams.

The Incremental Growth Question Nobody Asks

The most useful question in any budget review is one that almost never gets asked: “If we spent nothing on this channel for three months, what would actually change?” Not what the attribution model says would change. What would actually change in terms of revenue, customer acquisition, or market position.

I have seen businesses run that test, intentionally or through budget freezes, and the results are often surprising. Some channels that look essential turn out to be decorative. Some channels that are routinely underfunded turn out to be doing more structural work than anyone realised. The incrementality question is not always answerable with precision, but asking it honestly changes how you think about allocation.

BCG’s work on evolving go-to-market strategy makes the point that financial services businesses often over-invest in channels that serve existing customers and under-invest in the channels that would reach new segments. The same pattern applies across most categories. The budget follows the path of least resistance, which is usually the existing customer base, not the growth opportunity.

Growth hacking frameworks, as covered by resources like Semrush’s examples of growth hacking in practice, often surface this same tension: the tactics that scale fastest are rarely the ones that built the brand in the first place. Budget allocation needs to hold both in tension.

Seasonal and Cyclical Budget Planning

One area where budget decisions go wrong consistently is timing. Businesses tend to spend evenly across the year, or spike at obvious seasonal moments, without thinking carefully about when their category is actually in market.

The principle is straightforward: advertise when people are ready to buy, or when you can most efficiently shift them towards readiness. That is not always the same as your fiscal quarter. It is not always December. It depends on the category, the purchase cycle, and the competitive landscape.

When I was managing large retail media budgets, the temptation was always to follow the competitor calendar. Everyone spends in Q4, so we spend in Q4. But the more interesting question was where the white space was. Where were competitors pulling back? Where was demand still present but supply of advertising reduced? That is where efficient spend often lives.

Creator-led campaigns at key seasonal moments are one area where timing matters enormously. Later’s work on creator-led holiday campaigns illustrates how the timing and format of spend can matter as much as the volume. A well-timed creator campaign in the pre-consideration window can do more commercial work than a larger spend at peak.

Budget Governance: Who Owns the Decision?

Budget allocation is partly a technical question and partly a political one. In most organisations, the people closest to the data are not the people with the authority to reallocate spend. The people with authority are often working from summaries of summaries, presented by teams with an interest in protecting their channel budgets.

I spent years in agency leadership watching this dynamic play out. A client’s search team would present search performance. The social team would present social performance. The display team would present display performance. Each deck would show strong results. Nobody would present the full picture, because the full picture was nobody’s job to own.

Effective budget governance requires someone with a view across all channels and a mandate to allocate based on commercial outcomes rather than channel advocacy. In smaller businesses that is usually the CMO or the founder. In larger businesses it often requires a dedicated planning function with real authority, not just advisory status.

The tools exist to support better decision-making. Growth and analysis tools can surface channel-level data in ways that make cross-channel comparison more honest. But tools do not fix governance problems. They just make the data more visible. If the incentive structure rewards channel-level performance over total commercial performance, the budget will continue to fragment.

Budget decisions sit at the intersection of commercial strategy, media planning, and organisational dynamics. For a broader view of how these pieces connect in a go-to-market context, the Growth Strategy hub covers how leading businesses structure their market approach from the top down, not just the channel up.

What Good Ad Budgeting Actually Looks Like

I judged the Effie Awards for several years. The Effies are one of the few award programmes that require entrants to demonstrate commercial effectiveness, not just creative quality. What struck me, reviewing hundreds of cases, was how often the winning work was not the most expensive or the most technically sophisticated. It was the work that had been allocated to the right job at the right time with the right measurement framework.

The budgets behind those cases were not necessarily large. They were well-structured. The brand-building investment and the performance investment were in proportion to the commercial objective. The measurement was honest about what each part of the plan was supposed to achieve. And the governance was clear enough that the plan could be held to account.

That is what good ad budgeting looks like. Not a particular percentage split or a specific channel mix. A structure that connects spend to commercial intent, separates the different jobs advertising needs to do, and measures each one on terms that make sense for what it is actually trying to achieve.

The businesses that get this right are not always the ones with the biggest budgets. They are the ones with the clearest thinking about where growth comes from and the discipline to fund that thinking rather than fund the status quo.

About the Author

Keith Lacy is a marketing strategist and former agency CEO with 20+ years of experience across agency leadership, performance marketing, and commercial strategy. He writes The Marketing Juice to cut through the noise and share what works.

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