Affiliate marketing spend in the U.S. 2023-2028

Affiliate Marketing Spend in the U.S. Hits New Highs

Affiliate marketing spending in the United States has experienced remarkable growth, with 2024 figures reaching $13.63 billion, a 49.8% increase from $9.1 billion in 2021. This explosive growth underscores the channel's expanding role in the digital economy, as affiliates now drive $113 billion in e-commerce sales, accounting for 9.4% of all U.S. online transactions. The channel's efficiency and performance-based nature have made it a cornerstone of modern marketing strategies, with brands allocating an estimated 15-20% of their total sales to affiliate partnerships.

Historical Spending Trends and Projections

Looking back, affiliate marketing spending has more than doubled since 2018, when it stood at $6.2 billion. According to Statista, spending in 2023 was $9.56 billion, with projections of $10.72 billion for 2024 and approximately $12 billion for 2025. These figures align with the PMA study showing $13.63 billion in 2024, indicating a faster-than-expected acceleration. By 2026, spending is projected to reach $8.5 billion (though some sources suggest higher), with continued growth expected through 2028, as e-commerce expands and digital ad budgets increasingly shift toward performance-based channels.

Key Drivers Behind the Surge

Several factors are fueling this growth. First, the shift toward performance-based marketing has made affiliate programs more attractive, as brands pay only for results. Second, the rise of influencer marketing and content creators has expanded the affiliate ecosystem, bringing new audiences and trust. Third, advancements in tracking and attribution technology have improved ROI measurement, making it easier to justify increased spend. Additionally, the pandemic accelerated e-commerce adoption, and affiliate marketing has benefited from the sustained shift to online shopping.

Affiliate Marketing's Share of Digital Ad Budgets

Affiliate marketing now accounts for approximately 12% of all digital advertising budgets in the U.S., a significant increase from previous years. This share is expected to grow as brands recognize the cost-effectiveness of affiliate channels compared to traditional display or search ads. The channel's ability to drive conversions at a lower cost per acquisition makes it a key component of integrated marketing strategies, particularly for e-commerce businesses looking to maximize ROI.

Impact on E-commerce Sales

Affiliates are not just a marketing tactic; they are a major revenue driver. In 2024, affiliates generated $113 billion in e-commerce sales, a 59% increase from $71 billion in 2021. This represents 9.4% of all U.S. e-commerce sales, a share that is projected to climb steadily. For individual merchants, affiliate marketing typically contributes 15-20% of total sales, making it indispensable for brands seeking scalable growth. The compound annual growth rate of affiliate-driven sales (14.45% from 2021-2024) outpaces overall e-commerce growth (7.84%), highlighting the channel's efficiency.

Publisher Landscape Transformation

The affiliate publisher landscape is evolving rapidly. Traditional coupon and cashback sites are being joined by content creators, review sites, and social media influencers. This diversification is expanding reach and audience engagement. The number of active affiliate marketers in the U.S. has grown to approximately 1.2 million, with average earnings reaching $15,000 annually. This growth is fueled by low barriers to entry and the potential for passive income, attracting a wider range of participants across niches.

Global Context and Future Outlook

While the U.S. leads globally, with $7.9 billion in 2026 spend (87% of North America), other regions are also growing. Forrester projects global affiliate spend will reach $19.4 billion in 2026, up from $17.1 billion in 2025, with North America accounting for 47%. The U.S. spend per internet user is $28.40, the highest globally, indicating room for growth in other markets. As technology advances and consumer behavior shifts, affiliate marketing is set to remain a dynamic and essential component of the digital economy, with U.S. spending expected to continue its upward trajectory through 2028 and beyond.

Strategic Implications for Marketers

For marketers, the data underscores several actionable insights. First, invest in affiliate programs as a high-ROI channel, given its growing share of e-commerce sales. Second, diversify affiliate partnerships to include content creators and influencers to tap into new audiences. Third, leverage advanced tracking and attribution tools to optimize campaign performance. Fourth, focus on building strong relationships with top-performing affiliates to maximize long-term value. As the landscape evolves, staying agile and data-driven will be key to capitalizing on this growth.