Retail media has grown beyond being a “nice-to-have” line item within a broader performance marketing budget. As retail media networks (RMNs) become more established as full-funnel channels, they now have their own inventory, measurement methods, and pricing models.
This creates a planning problem for agencies. When retail media spending is simply grouped into a generic “performance” budget, it becomes harder to plan spending, forecast results, track performance, and report ROI accurately.
The solution is to treat retail media as its own budget line while still connecting it to the wider marketing plan. This piece explains why retail media deserves separate budget treatment, how agencies can structure that separation, and what media buyers should consider before deciding where the line between the two should sit.
TL;DR
- Retail media and performance marketing use different data, pricing models, and measurement logic. Keeping them in one budget can make attribution and ROI comparisons misleading.
- Retail media is forecast to reach roughly $71.09 billion in U.S. ad spend in 2026, making it large enough to justify its own budget governance rather than being treated as a sub-line of performance marketing.
- The practical budget split usually depends on three factors: funnel intent, data ownership, and P&L ownership. Retail media is often purchase-adjacent and powered by retailer first-party data, while performance marketing is broader and typically uses platform or publisher data.
- Agencies should manage the two spend pools separately, but connect them through shared measurement such as media mix modeling or incrementality testing.
- Double-counting is a key risk. When retail media and performance marketing both influence the same sale, giving both channels full credit can make the ROI of each budget look higher than its true incremental impact.
Why can’t retail media just live inside the performance marketing budget?
Retail media and performance marketing are built on different types of data, and that difference affects how each channel should be planned and evaluated.
Performance marketing, including search, social, and open-web display, generally relies on platform-level signals. These can include cookies, device IDs, or platform login graphs that help advertisers understand and target audiences. Retail media works differently. It uses the retailer’s own first-party purchase data, which can be connected to actual SKU-level transactions rather than relying mainly on inferred intent. That difference matters because the two channels often answer different questions. Performance marketing generally asks: “Who is likely to want this?” Retail media is closer to asking: “Who has already bought something like this, on this retailer, at this price point?”
For example, a paid social campaign may target people who have shown an interest in a particular product category. A retail media campaign can target shoppers who are already searching for that category or who have previously purchased related products from the retailer.
Putting both activities into one budget line makes it harder to understand what is actually driving sales. An increase in sales could come from broader demand generation, or it could come from influencing a shopper who was already close to making a purchase. That distinction matters when deciding where the next dollar should go.
How big does retail media actually need to be before it warrants its own budget?
Scale is a legitimate trigger for budget separation, and retail media has crossed that threshold in most categories. US retail media ad spend is forecast to reach $71.09 billion in 2026, up from $60.32 billion in 2025. Globally, WARC projects retail media will represent about 15% of all global ad spend in 2026. At this level, retail media is no longer a small rounding error inside a shopper marketing budget. It is large enough to sit alongside other major media categories that already receive their own budget lines, such as connected TV or paid social. Any channel commanding a double-digit share of total ad spend needs its own forecasting, pacing, and reporting cadence rather than being absorbed into a catch-all performance bucket.
What’s the practical difference between “retail media” and “performance marketing” for budgeting purposes?
The easiest way to separate the two is to look at three variables:
- Where the ad runs
- Whose data powers the ad
- Who inside the client organization owns the P&L for the spend
Retail media runs on retailer-owned properties such as Amazon, Walmart, Target, Instacart, and Kroger, as well as off-site extensions of those retail media networks. It is largely powered by purchase-intent and SKU-level data that the retailer controls. Performance marketing, on the other hand, generally runs across open-web and walled-garden platforms such as Google, Meta, and TikTok. These platforms use their own identity, behavioral, interest, and intent signals to help advertisers reach audiences.
The budgets can also come from different parts of the client organization. Retail media dollars often come from trade marketing, shopper marketing, or sales/category management budgets. These teams may be working with specific retailers and may have retailer-specific commercial goals. Performance marketing is more commonly funded through a brand, growth marketing, or demand-generation budget and is planned around broader acquisition goals.
This difference in budget ownership is a strong reason to keep the line items separate in agency planning documents. The agency is dealing with different stakeholders, different objectives, and often different financial rules.
How should an agency divide the two budgets without creating silos?
Separating the budgets does not mean separating the teams, data, or measurement. In fact, the agencies that handle this well usually do the opposite. They maintain two distinct spend pools, one for retail media and one for performance marketing, while bringing both into a shared measurement framework.
For example, an agency could:
- Set retail media budgets against retailer-specific KPIs such as on-platform ROAS, share of search, and off-site attributed sales.
- Set performance marketing budgets against broader funnel KPIs such as new-to-brand rate, cost per acquisition, and blended ROAS.
- Reconcile both budgets through a quarterly cross-channel review that adjusts spending based on incremental contribution rather than relying only on last-touch attribution.
This structure gives each channel room to operate according to its own economics without losing sight of the bigger customer journey. The goal is not to make retail media and performance marketing compete for credit. The goal is to understand how much incremental value each one is actually creating.
What KPIs should sit under each budget so they aren’t compared apples-to-oranges?
Retail media budgets are best evaluated on retailer-native metrics: on-platform ROAS, share of voice/share of search within category, off-site conversion attributed back to retailer data, and inventory-level metrics like out-of-stock-adjusted spend efficiency.
Performance marketing budgets are better evaluated on acquisition-oriented metrics: new customer rate, cost per acquisition, click-through rate, and blended ROAS across the funnel.
Using the same top-line “ROAS” number to compare a sponsored product placement on a retailer’s app against a prospecting campaign on Meta is misleading, because the retail media ad is often reaching a shopper who is already in a buying session, while the performance ad may be generating demand from scratch. Reporting them under separate KPI frameworks avoids crediting retail media with performance marketing’s job (demand creation) or vice versa.
Who typically owns each budget inside the client organization, and why does that matter for the agency?
Retail media spend frequently originates from trade marketing, category management, or shopper marketing budgets rather than the brand’s core media budget, because it’s tied to specific retailer relationships and often negotiated alongside trade terms. Performance marketing budgets usually sit with brand or growth marketing teams and are planned against always-on acquisition targets.
Keeping the budgets structurally separate allows the agency’s planning process to better match the way the client’s own organization operates. This makes several practical tasks easier. Reporting can be tailored to the stakeholder who owns the budget. Invoicing can follow the correct cost center.
Budget reallocation becomes easier to discuss because everyone knows which pool the money is coming from. It also avoids awkward comparisons. A shopper marketing stakeholder should not necessarily be asked to justify retail media spending using the same metrics as a performance marketing team. Likewise, a performance marketing lead should not be expected to explain why a retailer-specific promotional budget is being evaluated using broader demand-generation metrics. Separate budgets create clearer ownership without preventing the teams from working together.
How does budget separation change how an agency plans for seasonal or promotional periods?
Retail media budgets are often closely tied to retailer calendars. Examples include Prime Day, Walmart’s Deals events, back-to-school periods, and holiday shopping windows. During these events, spending may need to change quickly based on inventory availability, promotional pricing, retailer eligibility, and shopper demand.
Performance marketing budgets are usually planned around the brand’s own campaign calendar. They can be adjusted without being tied to one retailer’s promotional schedule. Keeping the budgets separate gives an agency more flexibility during these periods. For example, an agency can increase retail media spending when a retailer launches a major promotion or when a product becomes eligible for a high-traffic placement. It can also reduce spending if inventory levels become too low.
At the same time, the agency can keep an always-on paid search or social campaign running according to its own pacing plan. Without separate budgets, increasing spend around a major retailer event could unintentionally disrupt the pacing of campaigns that are not connected to that retailer’s calendar.
Does separating the budgets mean the two teams should never talk to each other?
No. And treating them as fully independent is one of the more common mistakes. Because performance marketing (especially paid search and social) frequently drives traffic to a product page that ultimately converts on a retailer’s site, and retail media ads influence purchases that a brand’s own site-side analytics may also try to claim credit for, the two teams need a shared view of the customer journey even if their budgets are managed separately.
The solution most agencies use is a joint measurement layer. This could include shared dashboards, a common incrementality testing framework, or a media mix model that includes both retail media and performance marketing spend. The budgets can remain separate while the measurement stays connected. That way, when an agency decides to move money from one channel to another, it can consider the spillover effects between the two rather than treating each channel as if it operates on its own island.
FAQs
Is retail media the same as shopper marketing?
No. Shopper marketing includes activities such as in-store displays and promotions. Retail media refers to paid ads on retailer properties or off-site placements powered by retailer data.
Does retail media replace paid search or paid social?
No. Retail media complements paid search and paid social, often reaching shoppers later in the purchase journey with retailer first-party data.
Who are the biggest retail media networks?
Amazon and Walmart are generally the largest, with Target, Instacart, Kroger, Home Depot, and others also expanding their retail media networks.
What’s the difference between on-site and off-site retail media?
On-site ads appear on a retailer’s website or app, such as sponsored products in Amazon search results. Off-site retail media uses retailer first-party data to target shoppers on external platforms and publisher inventory.
Should retail media ROAS be compared directly to paid social ROAS?
Not directly. The channels often reach shoppers at different funnel stages, so incrementality and other shared measurement methods provide a fairer comparison.
Final Takeaway
Retail media has grown large and data-distinct enough that treating it as a sub-line of performance marketing undercounts its scale and miscredits its impact. The most defensible structure separates the two budgets along funnel intent, data ownership, and client P&L ownership, while still unifying measurement so overlapping influence on the same sale isn’t double-counted. As retail media inventory keeps expanding off-site and retailer data clean rooms make cross-channel measurement more feasible, the agencies that already have this separation built into their planning process will be better positioned to reallocate budget quickly as retailer and platform economics shift.
