Do Affiliate Cookies Require Consent or Does Cookie Consent Impact Affiliate Programs?

Affiliate programs depend on attribution, and cookies are one of the most common ways to achieve it. Every time a user clicks an affiliate link, a network or merchant needs some way to remember that click so a later purchase can be attributed to the affiliate.

That memory is usually a cookie or similar tracking technology. Regulators, however, increasingly see these tools as online advertising/measurement and therefore require cookie consent. In this blog, we discuss when you’ll need cookie consent for affiliate websites, why, and the exemptions.

When we say affiliate cookies, we’re talking about tracking technologies that record a referral from an affiliate (publisher) to a merchant:

This is how a typical flow goes:

1. User reads a blog (publisher/affiliate).
2. They click an affiliate link to a merchant (advertiser).
3. The click goes via an affiliate network.
4. A tracking cookie or similar technology is set, often storing:
1. Click ID/transaction ID
2. Affiliate ID/publisher ID
3. Merchant ID/program ID
4. Time and sometimes device info or other identifiers
5. When the user purchases, that cookie ID is read, and a commission is calculated.

An affiliate’s ability to earn a commission often depends on whether the user completes a purchase during the merchant-defined cookie duration. If the user buys after the cookie expires, or if tracking cannot occur due to consent preferences or cookie deletion, the commission may not be recorded.

For example, Amazon Associates uses a 24-hour cookie, whereas  Semrush affiliate offers 120 days. 

Similarly, the affiliate program offered by Flowlu has set the cookie duration to 60 days.

The cookie duration for the CookieYes affiliate program is also 60 days.

If your website relies on affiliate links to earn commissions, ensure that you understand and comply with the following legal requirements for affiliate cookies.

Post-Brexit, the UK uses:

• Privacy and Electronic Communications Regulations (PECR) – particularly Regulation 6 on cookies
• UK GDPR and the Data Protection Act 2018

The ICO’s cookie guidance is very clear:

• Non-essential cookies, including third-party cookies used for online advertising or web analytics, always require consent under PECR.
• Measurement of advertising effectiveness is treated as part of the advertising purpose and also requires consent.

Authorities and industry bodies generally agree that only cookies that are essential for a service requested by the user (e.g. remembering items in a shopping cart, essential security) are strictly necessary. Therefore, advertising and analytics cookies are not.

Also, guidelines issued by the Affiliate & Partner Marketing Association[nofolllow] mention that cookies are typically treated as non-essential advertising/measurement cookies and therefore require consent for UK/EU users.

However, they may be treated as strictly necessary in limited cases such as:

• Cashback and loyalty sites: When users sign up specifically to earn cashback or rewards, tracking is required to deliver those benefits. Such tracking must be limited to attribution and not used for advertising or profiling.
• Closed-membership platforms: When users access account features that depend on tracking to function, such as purchase verification or referral reward dashboards.
• Short-lived technical tracking: When session-based tracking is needed to complete a user-initiated action and does not involve persistent identifiers.

You may see articles about the UK Data Act 2025 exemption for some affiliate or campaign tracking:

Some adtech commentary suggests that the UK is exploring a more affiliate-friendly approach, where certain consent-free tracking may be possible (statistical attribution of transactions) if:

• Purpose limitation is strictly enforced
• There is a clear opt-out
• Transparency is robust and interfaces with networks are clean.

Practical takeaway for now (late 2025):

• For risk-managed compliance, publishers should assume affiliate cookies in the UK still require opt-in consent.

If you are an affiliate website (blogs, reviews, etc) promoting other products or services using affiliate links, here are some measures you should take to avoid non-compliance with cookie consent requirements:

Websites serving EU/UK visitors must display a cookie banner that:

• Appears before any non-essential cookies load
• Provides clear options to accept, reject, or customise
• Blocks the affiliate network cookies until the user opts in
• Groups cookies into accurate categories such as Essential, Analytics, and Marketing
• Records and stores consent choices

This aligns with the GDPR and ePrivacy/PECR standards.

In the US,  cookie banners must:

• Meet transparency requirements
• Support opt-outs under state privacy laws when cookies are used for the sale/sharing of information or targeted advertising
• Acknowledge browser signals such as the Global Privacy Control (GPC) in states like California

It is a best practice for every affiliate website to maintain a dedicated cookie policy that:

• Lists all cookies and tracking technologies used
• Explains what each cookie does and how long it lasts
• Identifies third-party cookies used for affiliate tracking
• States whether cookies are used for attribution, analytics, or advertising
• Explains how users can change or withdraw consent at any time
• Links to each affiliate network’s privacy documentation

A well-written cookie policy reduces legal risk and builds trust with users.

The privacy policy should cover:

• What personal data is collected through cookies or tracking links
• Legal bases for processing (EU/UK)
• opt-out rights
• How long data is retained
• User rights such as access, deletion, opt-out of sale or sharing, and consent withdrawal
• Whether data is transferred outside the user’s jurisdiction

This is required by GDPR, UK GDPR, and all major US state privacy laws.

After installing a Consent Management Platform (CMP), ensure that:

• Affiliate scripts and pixels do not fire until consent is granted
• Consent preferences are passed to networks (where supported)
• Cookies are removed or suppressed if the user withdraws consent
• Server-side or cookieless tracking options are implemented in a compliant way
• Cookie durations are reviewed to ensure they are proportionate

This avoids accidental tracking and protects both the publisher and the affiliate network.

Users must be able to:

• Reject non-essential cookies
• Change or withdraw consent at any time through an easily accessible “Cookie Settings” link

Websites must:

• Offer a “Do Not Sell or Share My Personal Information” link when cookies qualify as a sale, sharing, or targeted advertising
• Honour Universal Opt-out Mechanisms or GPC signals where required

Affiliate websites should also:

• Use HTTPS across the entire site
• Ensure affiliate scripts load securely and from trusted sources
• Enable regular audits for third-party scripts
• Apply least-access principles to data collected through affiliate tracking
• Keep documentation of consent logs and data flows for regulatory inquiries

Security measures support compliance and reduce exposure to legal risk or data breaches.