UK affiliate and partner marketing grew five times faster than the UK economy in 2025, according to the Affiliate and Partner Marketing Association’s (APMA) State of the Affiliate Nation 2026 report. Its return on investment (ROI) averaged 15:1, and 19:1 in travel, a level few US programs ever reach at home, which is part of why the UK is usually the first market a US brand tests when it goes abroad. More than 7,500 US firms already have a presence there, the top location in Europe for US regional headquarters, according to the US International Trade Administration.
UK brands invested £1.8 billion in affiliate and partner marketing in 2025, generating £20.7 billion in revenue, per the same APMA report, inside a UK digital ad market that topped £40.5 billion in 2025, up 10% year-over-year, according to IAB UK. Here is what a US brand needs to know before launching, expanding, or benchmarking a UK affiliate programme: how big the channel has become, who runs it, and how it differs from the market you already know.
Key Takeaways
- More than 7,500 US firms already have a presence in the UK, the top European location for US regional headquarters, according to the US International Trade Administration, making it the most common first market for US brands expanding an affiliate program abroad.
- UK digital ad spend grew 10% in 2025 while the UK economy grew just 1.4%, according to IAB UK, with affiliate delivering a 15:1 return on investment that climbs to 19:1 in travel, according to the APMA, a return profile most US programs don’t see domestically.
- US affiliate spend will reach $13.81 billion in 2026, per eMarketer, but the partner mix differs: US programs skew toward cashback and loyalty partners, while UK spend is shifting toward full-funnel attribution that credits partners beyond the last click.
- Disclosure and privacy regulation genuinely diverge. The UK’s ASA requires explicit labels like #ad, distinct from FTC requirements, and UK GDPR compliance does not automatically satisfy US state-level privacy law like the CCPA.
Building a UK program properly pays for itself
It is tempting to take a US program that already works and just point it at a new market. The UK is where that shortcut gets expensive, to say the least. The return numbers above are not automatic. They come from a program built with its own strategy: a different partner mix, a different attribution culture, different regulatory requirements. That work is exactly what earns a return most US programs never see at home, and it is why affiliate keeps pulling a growing share of UK marketing budgets.
What UK affiliate networks matter if you already run a US program?
Open a UK affiliate dashboard for the first time and the network names feel familiar. CJ, Rakuten Advertising, impact.com, all three operate in the UK too, and a US team can log in and start recruiting the same day.
What catches people off guard is who actually leads on it, and how the categories a US program treats as separate have started to blend into each other.
TopCashback and Quidco run the UK’s cashback space roughly the way Rakuten Rewards runs it for US shoppers, competing on payout rates and tracking reliability.
VoucherCodes and HotUKDeals (part of Atolls, formerly Global Savings Group, which operates deal platforms across 21 countries) are among the most established players in the UK’s voucher and deal space, competing alongside TopCashback, Quidco, and a genuinely fragmented field of community-driven deal sites.
Awin leads the UK network market outright, ahead of Webgains, CJ, and Rakuten Advertising, worth knowing before assuming the network relationship that carries weight at home carries the same weight here.
Impact.com remains the cleanest crossover, the SaaS partnership category that looks and behaves the same on both sides of the Atlantic.
US programs pay cashback partners, UK programs are moving past the last click
A US affiliate program typically runs on cashback and loyalty publishers, which captured 35% of spend in 2024 versus just 16% for content publishers, according to eMarketer, part of the $13.81 billion US brands will spend on affiliate in 2026. Most US programs still credit whoever gets the last click, and that mix reflects it.
The UK works differently. Retail still accounts for 47% of UK affiliate spend, per the APMA, but travel, finance, and telecoms are gaining share fast, telecoms affiliates alone are delivering around one million new customers a month, and close to £1 in every £5 of UK affiliate spend now moves outside traditional last-click attribution. Brands are crediting partners earlier in the customer journey, not just the one who closes the sale.
For a US brand building a UK program from scratch, that shift matters from day one. The partner mix and attribution model that worked at home need to be rebuilt around how UK shoppers actually convert, not retrofitted after launch.
The regulatory difference that catches US brands off guard
UK and US disclosure and privacy rules are not interchangeable. We walk US clients through this early because it’s one of the easiest things to miss when a program already runs smoothly at home.
In the UK, the ASA and CMA’s joint influencer guidance requires affiliates and influencers to label any paid partnership, gifted product, or affiliate arrangement explicitly, using clear terms like #ad rather than ambiguous ones like #sp or #spon. Since April 2025, the CMA can fine businesses up to 10% of global turnover for hidden ads under the Digital Markets, Competition and Consumers Act.
In the US, the equivalent standard comes from the FTC’s endorsement guides, which require clear and conspicuous disclosure of any material connection between an endorser and an advertiser, including affiliate links. Enforcement has picked up sharply on both sides heading into 2026, with FTC actions up roughly 40% year over year and fines reaching $50,000 per violation.
Privacy works the same way. UK GDPR, enforced by the Information Commissioner’s Office, requires clear consent before tracking cookies or marketing communications can be used, and satisfying it doesn’t satisfy US requirements. California is the clearest example of why: new California Privacy Protection Agency regulations took effect January 1, 2026, layering in automated decision-making, risk assessments, and cybersecurity audits well beyond the disclosure-only rules most affiliate teams are used to. We build both into a program from day one, not as something we fix after launch.
Do US affiliate tax obligations carry over into a UK program?
Not exactly, and that’s actually good news. Nexus tax has been a real headache for US affiliate programs since 2008: individual states require online retailers to collect sales tax based on affiliate relationships within their borders, and the Performance Marketing Association, the US affiliate industry’s dedicated trade body, has spent nearly two decades fighting the compliance burden it creates. None of that carries over to the UK. It just isn’t part of how a UK program gets built.
Worth knowing too: the US and UK each have their own trade body built specifically for this industry, not a general advertising association covering everything. The US has the PMA. The UK has the APMA, the same association behind the revenue and ROI numbers we’ve cited throughout this piece. Both publish the research that shapes how programs get benchmarked, and both are worth knowing exist once a program is running in both markets. The PMA’s 2025 Industry Study put US affiliate spend growth at 49.8% from 2021 to 2024, reaching $13.62 billion, a good cross-check alongside the eMarketer numbers already in here.
Strategies to expand in the UK market
The language overlaps almost completely. Everything else, how partners expect to be addressed, how shoppers actually research before buying, what makes a program feel built for this market instead of dropped into it, does not carry over just because the words do.
Localize beyond the obvious. Same language does not mean same words. "Trainers," not "sneakers." "Trousers," not "pants." British spelling, "colour," "favourite," "optimise," reads as more credible to UK partners and shoppers than American spelling left unchanged.
Build for research-heavy shoppers. UK online shoppers spend an average of £89 a month, well above the broader European average of £73, according to Doofinder’s 2025 Online Consumer Landscape Study. A partner mix built for that level of scrutiny needs comparison sites and reviewers with real credibility, not just the cashback and voucher partners a US program typically leans on.
Ground every decision in data. We’re a four-time winner of the PMA’s Best Affiliate and Partnership Marketing Agency UK award (2021, 2022, 2023, 2025), and that track record comes from the same discipline behind every program we build: analyzing the competitor landscape and partner mix for each client to design a program for incremental, profitable growth, not the high-volume, low-margin sales a copied US strategy tends to produce.
Frequently asked questions
Why do most US brands choose the UK as their first international market?
Shared language and similar business frameworks make it the path of least resistance, and the numbers back it up. More than 7,500 US firms already operate in the UK, according to the US International Trade Administration, more than in any other European market, with the UK also serving as the top regional headquarters location for US companies covering Europe, the Middle East, and Africa.
How big is the UK affiliate marketing industry compared to the US?
The UK generated £20.7 billion in tracked affiliate revenue in 2025 at a 15:1 return on investment, according to the APMA. US affiliate spend will reach $13.81 billion in 2026, per eMarketer, a larger raw spend figure, but the UK’s return profile and full-funnel attribution practices are notably more mature.
Can I use the same affiliate network I already use in the US?
Often, yes. CJ, Rakuten Advertising, and impact.com all operate in both markets, which gives a US team a real starting point. The category leaders once you’re in the UK are different though. Awin holds the largest UK network share, so plan to build new partner relationships rather than assuming your existing ones transfer.
Does US FTC disclosure compliance cover UK requirements too?
No. The UK’s ASA requires explicit labels like #ad on paid or gifted partnerships, a more specific standard than the FTC’s requirement for clear and conspicuous disclosure of a material connection. Meeting one does not automatically satisfy the other, and both have tightened enforcement heading into 2026.
Does a UK strategy carry over to the rest of Europe and APAC?
Partially. UK compliance discipline and full-funnel attribution practices tend to translate reasonably well to the rest of EMEA. APAC is a different story: Southeast Asia in particular runs on region-specific networks like ShopBack and Involve Asia, plus a much stronger influencer layer, that a UK or US playbook won’t surface on its own.
