Marketing budgets in plain English: how to build one your CFO will approve

What a marketing budget actually is

A marketing budget is simply a plan for spending, written in money. It answers three questions: what are we going to do, what will it cost, and when will the money go out. That is it. If your budget answers those three questions clearly, you are already ahead of most.

Your CFO is not looking for a perfect prediction of the future. They are looking for evidence that you have thought it through - that every line has a reason, and that you will notice quickly if reality drifts away from the plan.

Start with the plan, not the spreadsheet

The most common budgeting mistake is opening last year's spreadsheet and adding ten percent. Instead, start with what the business needs marketing to achieve this year: revenue targets, new product launches, markets to enter. Then work out what activity delivers that, and price the activity.

When you build bottom-up like this, every line in your budget has a story attached to it. 'Paid search: £8,000 a month' becomes 'Paid search: £8,000 a month, because search delivered a third of last year's pipeline and we need it to hold that while the new product ramps up.' The second version survives a budget review. The first gets cut.

Include the full cost, not just the media

Finance teams call advertising spend 'media', and it is usually the biggest line - but it is never the whole cost. A credible budget includes everything the plan needs to work:

• Media - paid search, paid social, print, sponsorships and other placements.
• Production - design, copywriting, photography, video and landing pages.
• Agencies and freelancers - planning, management and specialist support.
• Tools and data - the software, tracking and research the plan depends on.
• People costs, if your company counts them in the marketing budget.

Phase it across the year

A single annual number is hard to approve and impossible to manage. Break your budget into months or quarters. This is called phasing, and it does two useful things: it matches spend to when it will actually happen (a December campaign should not sit in January's numbers), and it gives you natural checkpoints to compare plan against reality.

That comparison is called a variance - simply the difference between what you planned to spend and what you actually spent. Reviewing variances monthly, in ten minutes, is the single habit that builds the most trust with a finance team.

How to defend it

When the budget is challenged - and it will be - resist the urge to defend the number. Defend the thinking instead. Explain what each line buys, what happens if it is removed, and what you would cut first if you had to. Coming to the meeting with your own proposed trade-offs signals commercial maturity better than any spreadsheet.

And if you get it wrong somewhere along the way? Say so early, with a fix attached. Finance teams forgive honest misses far more readily than surprises.