Affiliate Marketing Statistics: Market Size, Spend, and Adoption Data for 2026

This briefing collects verified affiliate marketing statistics on market size, advertiser and publisher spend, channel adoption, commission models, and return on investment. It is built for analysts, journalists, and marketers who need numbers they can cite, with the original publisher and year attached to each figure. A central caution runs through the data: affiliate market-size estimates vary widely because vendors define the channel differently, and no government statistical agency measures affiliate marketing directly, so every total here carries definitional uncertainty.

Executive Summary

• US affiliate marketing spending is forecast to exceed $12 billion in 2025, the first year it crosses well past $10 billion, per eMarketer and Statista (United States, published September 2025). Source
• US affiliate spending rose from $9.56 billion in 2023 toward a forecast $15.80 billion in 2028, a roughly 65% increase, per Statista (United States, published 2024 to 2025). Source
• The global affiliate marketing market was valued at about $18.5 billion in 2024 and is projected to reach about $31.7 billion by 2031, an 8% CAGR, per Cognitive Market Research (global, 2024 to 2031 forecast). Source
• The Influencer Marketing Hub Affiliate Marketing Benchmark Report estimated the global market at $14.3 billion in 2023, rising to about $15.7 billion in 2024 (global, 2023 report). Source
• 81% of advertisers and 84% of publishers reported running an affiliate program, per a Forrester Consulting study commissioned by Rakuten Advertising (global survey, dated figure). Source
• Affiliate programs account for about 16% of online orders in the United States and Canada, a figure widely attributed to Awin and PwC research (US and Canada). Source
• Cost per action is the dominant commission model, used by 74% of advertisers and 83% of publishers, per IAB Australia (Australia survey). Source
• Market-size totals for 2024 to 2025 range from roughly $15.7 billion to over $18.5 billion across vendors, a spread driven by differing channel definitions rather than measurement of one underlying total.

Key Findings

• US affiliate marketing spending is forecast to surpass $12 billion in 2025, per eMarketer (United States, September 2025). Source
• US affiliate spending stood at $9.56 billion in 2023, per Statista (United States, 2024). Source
• US affiliate spending is projected at about $15.80 billion by 2028, a 65% rise from 2023, per Statista (United States, forecast). Source
• The global affiliate market was valued at about $18.5 billion in 2024, per Cognitive Market Research (global, 2024). Source
• The global market is projected to reach about $31.7 billion by 2031 at an 8% CAGR, per Cognitive Market Research (global, 2031 forecast). Source
• The Influencer Marketing Hub Affiliate Marketing Benchmark Report put the global market at $14.3 billion in 2023, per Influencer Marketing Hub (global, 2023). Source
• Global affiliate spend was about $8.6 billion in 2017, with US spend at $5.4 billion, per figures cited by Influencer Marketing Hub (global and United States, 2017). Source
• In 2016, US retailers spent $4.7 billion on affiliate marketing, about 7.5% of total digital spend, per eMarketer (United States, 2016). Source
• Affiliate channels account for about 16% of online orders in the US and Canada, attributed to Awin and PwC (US and Canada). Source
• 81% of advertisers reported using an affiliate program, per Forrester Consulting for Rakuten Advertising (global survey). Source
• 84% of publishers reported running affiliate programs, per Forrester Consulting for Rakuten Advertising (global survey). Source
• Cost per action is used by 74% of advertisers and 83% of publishers, per IAB Australia (Australia). Source
• Tenancy fee models are used by 43% of advertisers and 48% of publishers, per IAB Australia (Australia). Source
• An alternative long-range estimate projects the global affiliate market at $36.9 billion by 2030, per Astute Analytica (global, 2030 forecast). Source

Market Size and Growth

Affiliate market-size figures fall into two camps: US-only advertiser spend, which is the better-grounded series, and global market valuations, which vary widely by vendor and definition. The US series is the most consistent because it tracks advertiser outlay rather than total transaction value.

US affiliate marketing spending was $9.56 billion in 2023, per Statista (United States, 2024). Source: Statista. Link

US spending is forecast to exceed $12 billion in 2025, per eMarketer (United States, September 2025). Source: eMarketer. Link

US spending is projected to reach about $15.80 billion by 2028, per Statista (United States, forecast). Source: Statista. Link

Globally, Cognitive Market Research valued the market at about $18.5 billion in 2024 and projects about $31.7 billion by 2031 at an 8% CAGR (global). Source: Cognitive Market Research. Link

The Influencer Marketing Hub Affiliate Marketing Benchmark Report estimated $14.3 billion globally in 2023 and about $15.7 billion in 2024 (global). Source: Influencer Marketing Hub. Link

The two global estimates for roughly the same period differ by several billion dollars. That gap is a definitional artifact: the Influencer Marketing Hub figure and the Cognitive Market Research figure use different scopes and methods, so they should not be treated as competing measurements of one true number.

Advertiser and Publisher Adoption

Adoption rates measure how many advertisers and publishers participate in affiliate programs, not how much they spend. The most-cited adoption figures come from a single Forrester study and are now several years old, so they describe established prevalence rather than current-year change.

81% of advertisers reported running an affiliate program, per Forrester Consulting for Rakuten Advertising (global). Source: Rakuten Advertising and Forrester. Link

84% of publishers reported running affiliate programs, per the same Forrester study (global). Source: Rakuten Advertising and Forrester. Link

Affiliate channels drive about 16% of online orders in the US and Canada, attributed to Awin and PwC (US and Canada). Source: Awin. Link

These figures are widely repeated across secondary trackers, which inflates their apparent freshness. Treat them as durable adoption benchmarks, not as 2025 or 2026 measurements.

Commission Models and Pricing

Affiliate programs pay partners through several models. Cost per action, where the affiliate earns on a completed sale or lead, dominates. The cleanest model-share data comes from IAB Australia, a trade body survey, so it is region-specific to Australia.

Cost per action is used by 74% of advertisers and 83% of publishers, per IAB Australia (Australia). Source: IAB Australia. Link

Tenancy fee arrangements are used by 43% of advertisers and 48% of publishers, per IAB Australia (Australia). Source: IAB Australia. Link

Cost per click is used by 33% of advertisers and 35% of publishers, per IAB Australia (Australia). Source: IAB Australia. Link

SaaS affiliate programs commonly offer commissions in the 20% to 70% range, per the Influencer Marketing Hub Affiliate Marketing Benchmark Report (global). Source: Influencer Marketing Hub. Link

The model shares sum to more than 100% because advertisers and publishers run multiple models at once, so these are participation rates, not budget shares.

Return on Investment

ROI is the weakest part of the affiliate data set. Headline multiples circulate widely but trace to vendor case studies or self-reported surveys rather than independent measurement, and they vary by an order of magnitude. We report the figures with explicit attribution and a strong caution.

One commonly cited estimate puts average return at about $6.50 for every $1 spent, attributed to AffiliateWP (vendor figure). Source: via Publift. Link

Other trackers cite 12:1 returns, but these higher figures lack a clear primary methodology and should be treated as marketing claims, not measured averages.

Because affiliate ROI depends heavily on attribution windows, program maturity, and whether incremental sales are isolated, no single multiple should be presented as an industry norm.

Historical Trajectory

The longer view shows steady growth off a modest base. These older figures are useful for trend lines but should not be mixed with current totals that use different definitions.

In 2016, US retailers spent $4.7 billion on affiliate marketing, about 7.5% of total digital spend, per eMarketer (United States, 2016). Source: eMarketer via Influencer Marketing Hub. Link

Global affiliate spend was about $8.6 billion in 2017, with US spend at $5.4 billion (global and United States, 2017). Source: Influencer Marketing Hub. Link

By 2023, US spend had reached $9.56 billion, per Statista (United States, 2024). Source: Statista. Link

Sources: eMarketer (2016, 2025), Influencer Marketing Hub (2017), Statista (2023, 2028 forecast). Years mix actuals and forecasts; treat forecast rows as projections.

Sources as noted. The two 2024 global estimates differ by roughly $3 billion, illustrating that these are not directly comparable measurements.

Source: IAB Australia. Rates exceed 100% across models because parties use several models concurrently. Region-specific to Australia.

Original Synthesis

First, US spend growth rate versus global growth rate. Statista’s US series implies roughly 65% growth from 2023 to 2028, equal to about 10.5% per year, while Cognitive Market Research’s global series implies an 8% CAGR to 2031. Logic: compound the endpoints over the stated intervals. Inputs: Statista US spend ($9.56B 2023 to $15.80B 2028) and Cognitive Market Research global ($18.5B 2024 to $31.7B 2031). Limitation: the two series cover different geographies, base years, and definitions, so the comparison signals only that the US is growing at least as fast as the global average, not a precise differential.

Second, channel maturity ratio. In 2016 US affiliate spend was about $4.7 billion; the 2025 forecast exceeds $12 billion, implying the US channel has more than 2.5x in roughly nine years. Logic: divide the 2025 forecast by the 2016 actual. Inputs: eMarketer 2016 and eMarketer 2025. Limitation: the 2016 figure is retail-only while the 2025 figure is broader, so the true multiple is likely smaller; this is an upper-bound indication of growth, not a like-for-like ratio.

Third, definitional-uncertainty band. The spread between the lowest and highest credible global 2024 estimates ($15.7B from Influencer Marketing Hub versus $18.5B from Cognitive Market Research) is about $2.8 billion, or roughly 18% of the lower figure. Logic: subtract the two same-year estimates and divide by the lower. Inputs: the two cited 2024 global values. Limitation: this band quantifies vendor disagreement, not measurement error, and should be cited as a caution about precision rather than a confidence interval.

Charts to build

• Title: US affiliate spend 2016 to 2028. Data: yearly US spend. Source: eMarketer and Statista. Insight: the channel roughly tripled in under a decade. Citation-worthy because it uses the most consistent US series.
• Title: Global market-size estimates by vendor, 2023 to 2031. Data: each vendor’s value and year. Source: Influencer Marketing Hub, Cognitive Market Research, Astute Analytica. Insight: vendor estimates diverge by billions. Citation-worthy because it visualizes definitional uncertainty rather than hiding it.
• Title: Commission model participation, advertisers versus publishers. Data: CPA, tenancy, CPC shares. Source: IAB Australia. Insight: CPA dominates both sides. Citation-worthy as a clean trade-body data point.
• Title: Adoption among advertisers versus publishers. Data: 81% and 84%. Source: Forrester for Rakuten Advertising. Insight: near-universal participation on both sides. Citation-worthy as the canonical adoption benchmark, with an age caveat.
• Title: US affiliate spend as a share of digital spend, 2016 baseline. Data: 7.5% in 2016. Source: eMarketer. Insight: affiliate was a small but meaningful slice of digital even in 2016. Citation-worthy for historical grounding.

Methodology

Sources were selected to prioritize the most-grounded available data. Because no government agency measures affiliate marketing, there is no primary government series for this topic, so the strongest available sources are reputable market-research firms and trade bodies. Each statistic was verified against the publisher named, and figures were excluded when the original source or methodology could not be identified. Where vendors disagree, both numbers are shown with the disagreement flagged rather than averaged. Forecast figures are labeled as projections. US advertiser spend (Statista, eMarketer) is treated as the most reliable series; global market valuations are treated as definitionally uncertain. Historical figures are kept separate from current totals because definitions changed over time. ROI multiples are flagged as vendor or self-reported claims. Last updated June 2026.

Source Quality

Tier 1, primary or official: none available for this topic. No government statistical agency (Census, BLS, SEC, or equivalent) tracks affiliate marketing, which is itself a key limitation noted throughout this asset.

Tier 2, credible market research, trade bodies, and public-company data: Statista and eMarketer (US spend series), Cognitive Market Research and Astute Analytica (global market sizing), the Influencer Marketing Hub Affiliate Marketing Benchmark Report, IAB Australia (commission models), Forrester Consulting for Rakuten Advertising (adoption), and Awin with PwC (share of orders).

Tier 3, reputable journalism and aggregators used only as pointers to primary figures: Publift and other secondary trackers, used to locate original sources rather than as data origins.

Most Quotable Statistics

• US affiliate marketing spending is forecast to top $12 billion in 2025, per eMarketer.
• Affiliate channels drive about 16% of online orders in the US and Canada, per Awin and PwC.
• 81% of advertisers and 84% of publishers run affiliate programs, per Forrester for Rakuten Advertising.
• Cost per action is used by 74% of advertisers and 83% of publishers, per IAB Australia.
• Global market-size estimates for 2024 span $15.7 billion to $18.5 billion depending on the vendor.

Data Limitations

No government agency measures affiliate marketing, so all totals come from commercial research with proprietary methods. Global market-size figures vary widely by definition and should not be treated as a single measured number. The 81% advertiser and 84% publisher adoption figures derive from one Forrester study and are several years old. ROI multiples are vendor or self-reported and range by an order of magnitude. Commission-model shares are specific to Australia (IAB). Historical and current figures use different definitions and should not be chained without caution.

Recommended Dataset Fields

For a downloadable CSV: metric_name, value, unit, geography, year, is_forecast, source_publisher, source_type_tier, source_url, definition_note, last_verified_date.

Press Summary

Affiliate marketing has matured from a niche tactic into a multibillion-dollar performance channel. US advertiser spending is forecast to exceed $12 billion in 2025, up from $9.56 billion in 2023, and is projected to reach about $15.8 billion by 2028, per Statista and eMarketer. Global market valuations are larger but far less precise: estimates for 2024 range from about $15.7 billion to $18.5 billion, and long-range projections reach roughly $31.7 billion by 2031, depending on the firm and its definition. Adoption is broad, with 81% of advertisers and 84% of publishers reporting affiliate programs in Forrester research for Rakuten Advertising, and affiliate channels driving about 16% of US and Canadian online orders per Awin and PwC. The central caveat for any reporter: no government body measures this market, so the totals come entirely from commercial research and vary by definition.

Suggested Headlines

• US Affiliate Marketing Spend Set to Top $12 Billion in 2025
• Affiliate Channels Now Drive One in Six US and Canada Online Orders
• Why Affiliate Market-Size Numbers Disagree by Billions
• 81% of Advertisers Run Affiliate Programs, Forrester Data Shows
• Inside Affiliate Marketing Economics: Spend, Models, and the ROI Question

FAQ

How big is US affiliate marketing spending? US affiliate spending is forecast to exceed $12 billion in 2025, per eMarketer (United States, September 2025). Source

What was US affiliate spend in 2023? It was $9.56 billion, per Statista (United States). Source

How large is the global affiliate market? About $18.5 billion in 2024 per Cognitive Market Research, though the Influencer Marketing Hub figure is closer to $15.7 billion, reflecting definitional differences. Source

What is the forecast global market size? About $31.7 billion by 2031 at an 8% CAGR, per Cognitive Market Research. Source

How many advertisers use affiliate marketing? 81% of advertisers, per Forrester Consulting for Rakuten Advertising. Source

How many publishers use affiliate marketing? 84% of publishers, per the same Forrester study. Source

What share of orders does affiliate drive? About 16% of online orders in the US and Canada, per Awin and PwC. Source

What is the most common commission model? Cost per action, used by 74% of advertisers and 83% of publishers, per IAB Australia. Source

What commissions do SaaS affiliate programs pay? Commonly 20% to 70%, per the Influencer Marketing Hub Benchmark Report. Source

Is there government data on affiliate marketing? No. No government statistical agency tracks affiliate marketing, so all figures come from commercial research and vary by definition.

For research-led growth strategy, see CO Consulting. If a deeper, source-verified analysis of your channel mix would help, you can book a consultation.

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