Is there really a difference between rel=nofollow and rel=sponsored for affiliate links?

Why does Google offer two different attributes?

Historically, rel=nofollow was used for everything: paid links, UGC, affiliations. In 2019, Google introduced rel=sponsored and rel=ugc to segment signals. The aim is simple: to refine the understanding of the link graph by distinguishing between advertising, user-generated content, or a natural link.

For affiliate links, rel=sponsored is therefore the semantically most precise choice. But — and this is crucial — Google continues to treat rel=nofollow as a valid signal for these links. No abrupt break, no retroactive penalties.

What does this actually change for crawling and PageRank?

Since 2019, the nofollow, sponsored, and ugc attributes have become hints rather than strict directives. Google can choose whether or not to follow these links, and whether or not to include them in its popularity calculation.

In practice, an affiliate link with rel=sponsored typically does not transmit PageRank — but Google reserves the right to use it to better understand the web’s structure. A site that clearly signals its affiliations with sponsored sends a signal of transparency.

Can multiple attributes be combined on the same link?

Yes, and it is even recommended in some cases. A link can carry rel="nofollow sponsored" without any problems. This covers both the "do not transmit PageRank" aspect and "commercial link" without confusion.

This is particularly useful for older CMSs or plugins that automatically inject nofollow: adding sponsored as well costs nothing and clarifies intent. Google treats the combination as a set of compatible signals.

• rel=nofollow remains valid for affiliate links, without penalty
• rel=sponsored is semantically more precise and improves Google’s understanding of the site
• Both attributes have become hints, not absolute directives
• You can combine multiple attributes on the same link (e.g., nofollow + sponsored)
• No major measurable SEO difference between the two for ranking

Is this statement consistent with field observations?

Yes, but with an important nuance. On paper, Google states that there is “no major SEO difference” — which is true in terms of direct ranking. No A/B testing that I am aware of has shown a ranking gain from switching from nofollow to sponsored on affiliate links.

However, algorithmic transparency matters. A site that clearly marks its affiliations with sponsored sends a good faith signal, which can play a role in borderline cases — especially during manual audits or anti-spam filtering. [To be verified]: the actual impact of this "good faith" signal remains publicly unquantified.

Why does Google emphasize rel=sponsored then?

Because rel=sponsored adds granularity to graph analysis. Google realizes that the web is full of commercial links, and distinguishing them helps to better weigh signals. An affiliate link does not have the same editorial value as a natural link — and Google wants to be able to make this distinction programmatically.

It’s also a matter of compliance: by marking sponsored links, you comply with FTC guidelines (in the US) and transparency rules in Europe. Google indirectly pushes sites to comply with regulations, which reduces the risk of deceptive content in its results.

In which cases should sponsored be absolutely prioritized?

If your site profits massively from affiliate marketing (comparators, deal sites, reviews), using rel=sponsored consistently is a safety bet. It limits the risk that an algorithm (or a human) misinterprets your links as attempts to manipulate PageRank.

Conversely, on a personal blog with 3 affiliate links per year, sticking with nofollow is not a problem. The logic should remain proportional to the volume and nature of the site. An affiliate site that does not properly mark its links takes an unnecessary risk in case of manual action.

What should be done concretely on an existing site?

If your affiliate links are already in rel=nofollow, there’s no rush to migrate everything. Google continues to handle them correctly. However, if you are redesigning your site, standardize on rel=sponsored: it’s cleaner, more semantic, and anticipates guideline evolution.

For new sites or new integrations, go directly with sponsored. Most affiliate platforms (Amazon Associates, Awin, CJ) now recommend this attribute in their documentation — it makes sense to follow the consensus.

What mistakes should be absolutely avoided?

The classic mistake: forgetting the attribute, or worse, putting rel=dofollow on an affiliate link in hopes of boosting its PageRank. Google detects unmarked paid link patterns, and the penalty can be severe (manual demotion, algorithmic filters).

Another trap: believing that sponsored alone is enough to make content acceptable. An article stuffed with affiliate links that provide no added value remains spam, even with the right attributes. The technical signal does not compensate for an editorial issue.

How can I check if my site is compliant?

Sift through your site with Screaming Frog or Sitebulb: filter outgoing links containing affiliate parameters (utm_source, tag=, ref=) and check that they correctly have nofollow or sponsored. A CSV export can help quickly identify orphan links.

Complement this with a manual audit of high-traffic pages. An unmarked affiliate link on a page ranking in the top 3 represents a disproportionate risk compared to the rest of the site. Prioritize corrections based on the organic traffic of each page.

• Gradually migrate affiliate links from nofollow to sponsored (or combine both)
• Automate the addition of rel=sponsored through the CMS or affiliate plugins
• Check template models (single.php, product-review.php, etc.) for uniformity
• Audit with Screaming Frog for outgoing links containing affiliate parameters
• Document the policy on sponsored links in internal editorial guidelines
• Train writers on the correct use of the sponsored attribute