Affiliate Links: How They Work, Disclosure Rules and SEO Best Practices

Affiliate links are the basic unit of affiliate marketing. A blogger, a YouTuber or a comparison site recommends a product, and the merchant pays a share of the sale through its affiliate program. The mechanism is simple; the rules around it (consumer protection law and search engine guidelines) are where most mistakes happen.

How does an affiliate link work?

1. You join a program directly with a brand or through an affiliate network, and you receive a personal tracking ID.
2. You generate a link that contains this ID, often as a parameter (for example ?ref=yourname) or through a redirect domain run by the network.
3. A visitor clicks: the merchant or network records the click and usually stores a cookie or a click ID in the browser.
4. The visitor buys within the attribution window (from 24 hours to several months depending on the program).
5. The sale is attributed to you, most often on the last click, then validated after the return period and paid once you reach the payout threshold.

Tracking is becoming more server based: many programs combine cookies with server-to-server postbacks, so commissions survive browser restrictions better. If a visitor clicks links from two different affiliates, the program's attribution rule decides who is paid, which is why reading the terms matters before you invest in content.

What do affiliate links look like?

Redirect links on your own domain (often under /go/ or /recommends/) let you change the destination once for every article. Block them from crawling in robots.txt or keep the sponsored attribute on every link pointing to them.

Do you have to disclose affiliate links?

Yes. In the United States, the FTC requires a clear and conspicuous disclosure of any material connection with a brand, including commissions; its Endorsement Guides FAQ covers affiliate links explicitly. In the European Union, consumer protection rules also require commercial content to be identifiable, and many countries add their own rules on advertising and influencer marketing. Good practice everywhere:

• Place the disclosure before or right next to the first link, not only in a footer.
• Use plain words: "This article contains affiliate links; we earn a commission if you buy, at no extra cost to you."
• Repeat it in videos (spoken and on screen) and in social posts, not only in the description.
• Never claim to have tested a product you have not used.

How should affiliate links be tagged for SEO?

Google asks site owners to qualify links that involve payment or compensation. According to its documentation on qualifying outbound links, affiliate links should carry rel="sponsored"; rel="nofollow" is also accepted.

Unmarked paid links can be treated as link spam. For the vocabulary, see our glossary entries on the link, the anchor text and the backlink.

Can an affiliate site rank on Google?

Yes, if it adds value. Google's spam policies describe thin affiliation: pages that copy product descriptions or reviews from the merchant without original content. Affiliate pages that rank tend to share these traits:

• First-hand testing, with photos, measurements or screenshots.
• Clear criteria and a comparison table across several options.
• Honest limits and cases where a product is not the right choice.
• Up to date prices and specifications, with the date of the last check.
• An identified author with real experience in the topic.

The same qualities help AI assistants such as ChatGPT, Gemini or Perplexity cite your page when users ask which product to buy: direct answers, precise facts and comparisons are easy to extract.

Where should you place affiliate links in an article?

Placement changes clicks more than the number of links. Readers click when the link answers a decision they are about to make:

• In a summary box at the top, with the recommended option and one line on why, for readers who want the answer fast.
• In the comparison table, one link per product, next to the criteria that matter.
• At the end of each product section, after the strengths and limits, when the reader has enough information to choose.
• In the conclusion, repeating the best choice for each type of reader.

Use descriptive anchors such as "see current price" or "read the plan details" rather than vague ones, avoid linking the same product ten times, and never place links where they look like navigation or download buttons: misleading placements hurt trust and may break program rules.

How do you manage affiliate links at scale?

• Centralize links with a redirect or link management plugin so one change updates every page.
• Check for broken links and ended programs every month.
• Track clicks and conversions by page to see which content earns.
• Use the program's tools: deep links, product feeds, coupons.
• Keep a list of every program, its terms, cookie length and payout rules.

If you plan to run your own program as a merchant, our comparison of affiliate software covers the tracking tools.

What mistakes should you avoid?

• Hiding the disclosure at the bottom of the page.
• Leaving affiliate links without rel="sponsored" or nofollow.
• Publishing pages that only repeat the merchant's description.
• Recommending products only for their commission rate.
• Breaking program rules, such as using links in paid search ads or emails when forbidden.

Affiliate links work over time when they sit inside genuinely useful content, are clearly disclosed and are tagged rel="sponsored". To choose which programs to join, read our guide to the best affiliate marketing programs; if your audience works in marketing or SEO, the Sorank affiliate program is one of them.