Ask ten business owners how they set their marketing budget and most will describe some version of guesswork. Last year plus a bit. Whatever is left after other costs. What a competitor appears to be doing. None of these survive a serious question from a finance team.
There are two defensible ways to set a budget, and they work best together. One starts from revenue, the other from what a customer is worth.
The percentage of revenue approach
The simplest method is to allocate a share of revenue to marketing. It has the advantage of scaling with the business and being easy to explain.
For an external anchor, Gartner reported in its 2025 CMO Spend Survey, which covered 402 marketing leaders, that marketing budgets averaged 7.7 percent of company revenue, and that half of the CMOs surveyed reported budgets of 6 percent or less. That is a large enterprise benchmark rather than an Indian mid market standard, so use it as a reference rather than a rule.
In practice the right percentage varies enormously by situation. Businesses in growth mode, in competitive categories, or launching something new spend more. Businesses with strong word of mouth, long standing reputation or limited capacity to serve more customers spend less. The percentage method sets a sensible range. It cannot tell you whether the money is working.
The unit economics approach, which is better
The stronger method works backwards from a customer. Calculate what a customer is worth to you in gross profit over their lifetime. Decide what portion of that you are willing to pay to acquire one. Multiply by how many customers you want. That is your budget.
A worked example makes it concrete. Suppose your average customer generates two lakh in revenue over three years, and your gross margin is forty percent, so eighty thousand in gross profit. If you are willing to spend a quarter of that to acquire them, you can afford twenty thousand per customer. If you want fifty new customers this year, your acquisition budget is ten lakh.
This approach is better because it is defensible. It connects spend to profit, it tells you when to spend more rather than less, and it gives you a clear test for whether any campaign is worth continuing.
Split the budget by job, not by channel
A common mistake is dividing budget across platforms first. Better to divide it by the job the money is doing.
Demand capture is spend aimed at people already looking for what you sell, such as search advertising and search optimisation. It converts fastest and is the first priority for most established businesses. Demand creation is spend aimed at people who do not yet know they need you, such as social content and video. It works more slowly and builds the pipeline you will convert later.
Brand and infrastructure is the third category, covering identity, website, photography and the assets everything else depends on. It rarely shows an immediate return and quietly determines the performance of everything built on top of it. A site that loads slowly or a brand that looks unserious makes every rupee of advertising work harder for less.
Do not forget the cost of production
Budgets are frequently set for media and not for making the things the media distributes. Then the campaign runs with weak creative, underperforms, and the conclusion drawn is that advertising does not work.
Creative quality is now the largest lever in paid advertising performance, because the platforms have automated most of the targeting decisions that media buyers used to control. Allocating a meaningful share of budget to production is not a luxury, it is what determines whether the media budget returns anything.
Budget for time, not just money
Different activities pay back on different clocks. Search advertising can produce enquiries within days. Search optimisation typically compounds over six to twelve months. Brand work shows up as easier sales and less price resistance over a year or more.
If your budget assumes everything returns within a quarter, you will systematically cut the work that was about to pay off. Set the horizon per activity before you start, and agree it with whoever reviews the numbers.
When to increase spend, and when to stop
Increase when the numbers give you permission. If acquisition cost is comfortably below what a customer is worth, and your business can actually serve more customers, spending more is the obvious move rather than a risk.
Stop or restructure when acquisition cost approaches customer value, when lead quality falls even as volume rises, or when the constraint has moved elsewhere in the business. Marketing cannot fix a sales process that does not follow up, a product with retention problems, or capacity you do not have. Spending more into any of those makes the underlying problem more expensive, not smaller.