Marketing BudgetSetting and splitting spend

Two questions, often confused#

Budget planning answers two questions: how much should we spend in total, and how should we split it? Teams often argue about the first when the real problem is the second. A generous budget spread across too many activities can achieve less than a modest one concentrated where it works.

Both questions should start from the marketing strategy and the marketing plan. Budget is the plan expressed in money. If the plan is vague, the budget will be argued about line by line instead of programme by programme.

Methods for setting the total#

There is no single correct method. Each has a logic and a blind spot. Most finance teams will accept a budget built one way and cross-checked another.

Building the budget from goals#

The objective-and-task method is the most useful starting point. Take the commercial goal, work backwards to the number of customers or opportunities required, estimate the cost of generating them through each programme, and add the fixed costs of people and tools.

Then test the result against unit economics. If the implied acquisition cost exceeds what a customer is worth over a reasonable payback period, the plan is not viable as written. Change the goal, the programmes, or the assumptions, but do not hide the gap. See CAC and LTV.

What goes into the budget#

Whether people costs sit in the marketing budget varies by organisation. Be clear which convention you use, because comparisons across companies or years are meaningless if one includes salaries and the other does not.

Splitting the budget by confidence#

Once the total is set, divide it by how confident you are in each programme. A common structure has three tiers: proven programmes with known returns, scaling programmes that showed promise and deserve more, and tests with clear hypotheses. The proportions are a judgement, but having a protected test share keeps the plan learning.

Balancing short-term and long-term spend#

Budgets built purely on unit economics tend to favour activity that converts quickly, because it is easier to measure. Brand and demand creation work pays back more slowly and less visibly. Starving it can make acquisition steadily more expensive. Decide the balance explicitly, rather than letting short-term reporting decide for you. See brand vs performance and demand generation.

Diminishing returns

Most channels show diminishing returns as spend rises. The first part of a search budget buys the most relevant queries; later spend buys broader, less likely buyers. The first audience a social campaign reaches is the most responsive; later reach is colder. Average returns hide this, because the strong early spend flatters the weaker marginal spend.

So ask what the next unit of spend would return, not what the average unit returned. Incremental tests, such as raising budget in one region and comparing with another, help answer that. When a channel’s marginal return falls below another channel’s, move money. This is the practical core of budget optimisation, and it is why budgets should be reviewed during the year rather than fixed at the start.

Seasonality and phasing#

Spread the budget across the year according to when buyers buy, not in equal monthly slices. Consumer brands in India often concentrate spend around festive periods, when demand and media costs both rise. B2B budgets often follow buyers’ financial-year planning. Phasing also matters for cash flow; share a monthly view with finance.

Managing the budget during the year#

• Review spend and results monthly against the plan.
• Move money from weak programmes to strong ones without waiting for the year end.
• Keep a small reserve for unplanned opportunities.
• Document every reallocation and the reason.
• Agree in advance what would be cut first if the total is reduced.

Presenting the budget to finance#

Finance teams approve budgets they can follow. Present the logic in the order they think: the commercial goal, the assumptions that connect spend to outcomes, the total and its phasing, and the risks. Show which assumptions are based on your own history and which are estimates, and how you will test the estimates early.

Offer scenarios rather than a single number. A base case, a reduced case and an expanded case, each with the programmes included and the outcomes expected, turn a negotiation into a choice. It also makes clear what the business gives up if the budget is cut, which is more persuasive than arguing for every line.

• Show cost per outcome, not only total spend.
• Separate fixed commitments from variable spend that can flex.
• Explain how you will report progress and when money could be moved.
• Be explicit about spend whose returns will take longer to appear.

Budgeting for new channels

New channels have no history, so their returns are unknown. Fund them as experiments: a defined amount, a defined period, a clear hypothesis and a decision rule written in advance. Make the test large enough to produce a readable result. A token amount spread thinly usually produces an inconclusive answer, which is the most expensive result of all.

Allow for learning costs. Creative, tracking and set-up often take a disproportionate share of a first test. Count them, but judge the channel on what it would cost at steady state.

Common mistakes

• Copying last year’s budget forward with an adjustment.
• Budgeting media without budgeting the creative and people to use it.
• No test share, so the plan never discovers anything new.
• Judging all spend on the same short time horizon.
• Hiding the gap between goal and affordable spend instead of resolving it.

Published by Fabulous.Media, a network of specialist marketing agencies. Updated 9 October 2026. Platform features change often; check current official documentation before acting on platform-specific detail.