Marketing Budget Planning for 2027: A Practical Guide for Growth Leaders

October 20, 2026 Marketing by Cliff Lin

Gartner’s 2026 CMO Spend Survey put the average marketing budget at 7.8% of company revenue, up from 7.7% in 2025. In the same survey, 56% of CMOs said their teams lack the budget to deliver their 2026 strategy. The sample was 401 marketing leaders, mostly at companies with more than $1 billion in revenue. If your company follows that pattern, 2027 will bring close to this year’s money and a longer list of things to fund. That turns marketing budget planning into a prioritization exercise more than a negotiation. I’ve used the same process across 16 years of SaaS and e-commerce budgets, with a few updates for what changed this year.

Zero-Based or Incremental Marketing Budget Planning

Incremental budgeting starts from last year’s number and adjusts each line up or down. It is fast, and it keeps programs running without a fight. The weakness is that nobody questions the base, so a trade show you attend out of habit survives year after year.

Zero-based budgeting starts every line at zero and makes each one justify its cost. Peter Pyhrr developed the method at Texas Instruments and described it in Harvard Business Review in 1970. It forces hard conversations. However, it also takes weeks, and in my experience applying it to salaries and core software rarely changes the outcome.

So I use a hybrid. People costs and the core martech stack roll forward incrementally. Every variable program starts at zero, including paid media, events, agencies, content production, sponsorships and any tool added in the last 18 months. For each of those lines, I ask the owner two questions. What did it produce last year, and what would break if it went to zero?

Splitting Brand and Performance Spend

The best-known benchmark comes from Les Binet and Peter Field. In 2013 they published The Long and the Short of It through the IPA. According to the IPA’s summary, the report put the optimum ratio at 60:40 between brand building and sales activation. For B2B, their 2019 research with LinkedIn’s B2B Institute recommended 46% brand and 54% activation.

Treat those ratios as a starting point for marketing budget planning. Before you pick one, check how your current spend is split by purpose. Most budgets I inherit follow channel lines, so a line called brand often includes retargeting, while a performance line includes video that mostly builds awareness. Tag each line by its job instead. Either it reaches people who aren’t in market yet, or it converts people who are.

The two halves also need different scorecards. Performance spend can answer to cost per acquisition and payback within the quarter. Brand spend should answer to slower signals, such as branded search volume, share of search and aided awareness. Judged on last-click conversions, brand spend looks like waste. My post on measuring brand impact covers how to track those signals. Also, my comparison of paid search and dark social shows the split in one channel decision.

Ring-Fencing a Testing Budget

In marketing budget planning, I treat the test budget as a fixed cost. I hold back about 10% of program spend for tests and protect it from mid-year cuts. Without that protection, testing money is the first to go when a quarter runs short. Then next year’s plan ends up as a copy of this year’s.

Each test gets a written hypothesis, a budget, a decision date and a stop rule before it starts. A good one reads like this. Moving 15% of non-brand search spend into YouTube in two regions will hold pipeline flat at lower cost. We stop if cost per opportunity rises more than 20% after eight weeks.

Measure tests with incrementality instead of platform-reported conversions. Geo holdouts and conversion lift studies estimate what would have happened without the spend. For the whole mix, Google opened its Meridian marketing mix model to everyone as open source in January 2025. As a result, a team with a data scientist can run media mix modeling in-house without licensing a vendor model.

Budgeting for AI Tooling Costs

AI now has its own line in most plans I review. Gartner’s 2026 survey found that CMOs allocate 15.3% of marketing budgets to AI on average, yet only 30% report mature AI readiness. When I audit that spend, the gap usually shows up as overlapping seat licenses that nobody owns.

Seat prices moved this year, too. On July 1, 2026, Microsoft raised prices on most Microsoft 365 commercial suites, citing new AI and security features bundled into the plans. Full Microsoft 365 Copilot is still a separate add-on, at $30 per user per month for enterprise plans. Microsoft also bills some agent features on a metered basis, and API-based tools charge by usage, so those costs rise with adoption.

For marketing budget planning, I split AI spend into four lines so each one has an owner:

Seats: per-user licenses for assistants, plus AI add-ons in tools you already pay for.
Usage: API calls, credits and metered agents, budgeted at low, expected and high adoption.
Integration: the data, engineering and agency hours needed to connect AI tools to your CRM and content systems.
Training and review: enablement time, plus legal and brand review of AI-generated work.

Taking the Plan to Your CFO

CFOs fund plans they can model. So present marketing in finance terms: customer acquisition cost by channel, payback period, contribution margin and pipeline coverage against the bookings target. Show last year’s plan against actuals first. A team that hit its numbers, or can explain a miss in one slide, earns room for new bets.

Next, show marginal returns instead of averages. The CFO’s real question is what the next $100,000 buys, and the answer differs by channel. The response curves from your testing budget answer that better than any blended ROI figure.

Finally, bring scenarios rather than one number. I build a base plan plus two lists. One holds cuts in the order I would make them, and the other holds additions I would fund with more money. Then agree on quarterly checkpoints where spend can shift between lines. Good marketing budget planning makes those shifts routine, and the marketing KPIs you report at each checkpoint should match the ones in the plan.

A Marketing Budget Planning Checklist for the Next Six Weeks

Pull 12 months of actual spend by line, and tag each line as fixed or variable.
Zero-base every variable line, starting with tools and programs added in the last 18 months.
Tag each line by its job, reaching future buyers or converting current ones, then set a target split.
Ring-fence a testing budget and write the hypotheses for the first two quarters of 2027.
Inventory every AI seat and usage contract, and cancel overlaps before their renewal dates.
Build the base plan, cut list and add list, then walk your finance partner through them before the formal review.
Tie the final numbers back to your annual marketing plan so every dollar maps to a goal.