The missing tag=: Amazon affiliate marketing's silent revenue leak

Of every affiliate-link problem, this one has the worst ratio of damage to visibility: a link missing its Associates tag looks perfect, works perfectly, and earns exactly zero.

What the tag actually does

When someone clicks an Amazon link with ?tag=yourname-20, Amazon sets an attribution cookie tying purchases in that session to your Associates account. No tag, no cookie, no commission — the transaction just happens, and Amazon keeps the whole margin. The viewer notices nothing. You notice nothing. There is no error to see, which is exactly why this leak survives for years in old descriptions.

The five ways tags go missing

• Copying the raw product URL from the address bar instead of using SiteStripe or the Associates link builder — the most common cause by far.
• Mobile-app shares — links shared from the Amazon app historically carried no tag, and old descriptions are full of them.
• "Cleaning up" the URL — trimming everything after the ? to make the link look tidy also deletes your paycheck.
• Links from third parties — a sponsor, editor, or VA sends you a product link; it carries their tag or none at all.
• Shorteners built without the tag — the shortlink resolves to the bare product page; everything downstream is untagged.

How to check a link in ten seconds

Open the link and look at the final URL after all redirects. If you don't see tag= followed by your Associates ID anywhere in it, that link earns nothing. Two gotchas: check the URL after shortlink redirects (the amzn.to hop can hide what's underneath), and make sure the tag is yours — a stray link carrying someone else's tag pays someone else. Our free link checker does this automatically: paste any link and it follows the chain and reports whether a tag is present on the final destination.

The fix — and keeping it fixed

Add your tag back: append ?tag=yourname-20 to the product URL (or &tag=… if the URL already has parameters), update the description in YouTube Studio, done. The harder problem is finding all of them across a few hundred descriptions — this is a pattern-matching job machines are much better at than eyes. A Channel Workbench scan flags every Amazon link in your catalog that resolves without a tag as a high-severity finding, because the traffic is already flowing; you're just not being paid for it. Tag detection works on every plan with no Amazon credentials required — it's pure URL analysis.

One caution: don't fix it with someone else's tool tag

Some link tools re-wrap your URLs through their own redirect domains. That's fine when it's adding your tag — read the fine print on whose tag ends up on the final URL, and spot-check with a checker after migrating. Attribution you can't verify is attribution you shouldn't trust.

Related: Why Amazon links stop earning · Finding broken links on your channel · Channel Workbench vs Geniuslink