How to Track Affiliate Links - From Click to Commission (2026)

Why Your Network Dashboard Isn't Enough

Your affiliate network tells you how many clicks and sales you got. It doesn't tell you which YouTube video, email, Instagram post or ad sent them. Without that, you can't tell which content to make more of or which traffic to stop paying for.

Tracking affiliate links properly means connecting each commission back to the exact source that earned it. There are four ways to do it, from free and simple to complete.

The Four Methods Compared

Method 1: UTM Parameters

UTM parameters are tags you add to links pointing at your own pages, such as a bridge page or review. Google Analytics reads them and reports visits by source, medium and campaign. They're case-sensitive, so stick to lowercase and keep names consistent.

They only tell you how people reached your site, not whether they bought from the merchant afterwards. Our UTM guide has a naming template.

Method 2: Outbound Click Tracking in GA4

Google Analytics 4's Enhanced Measurement records clicks on links that leave your site. You can create a custom event for clicks on affiliate domains, then see which posts and pages send the most clicks to merchants.

It's free and useful for content sites, but it stops at the click. You'll know a review page sent 300 clicks to a merchant, not how many of them bought.

Method 3: Sub-IDs

Most networks let you add a Sub-ID, a label like "yt-review-video" or "email-0412", to your affiliate link. When a sale happens, the network reports it with that label attached.

This is the simplest way to see commissions by source, and it's free. The downside is that each network reports separately, in its own dashboard and format, so comparing sources across several networks gets tedious.

Method 4: A Tracker With Postbacks

A dedicated tracker gives every click a unique ID and passes it into your affiliate link as the Sub-ID. When the network records a sale, it fires a postback, a server-to-server message, back to your tracker with that ID. The tracker then credits the commission to the exact click, and therefore the exact source.

This brings every network into one report, filters bot clicks, and lets you compare earnings per click across emails, videos, posts and ads. It's how ClickMagick tracks affiliate offers, using its Affiliate Link Builder and postback support for any network that offers Sub-IDs or postback URLs. See our postback URL guide.

Step by Step: Setting Up Full Affiliate Tracking

1. List your sourcesEvery email, video, post, bio and ad where you share affiliate links.
2. Create one tracked link per sourceOr one Sub-ID per source if you're starting free.
3. Set up postbacks in each networkPaste your tracker's postback URL into the network's settings.
4. Tag links to your own pages with UTMsSo bridge-page visits are attributed too.
5. Test with a real clickConfirm the click appears, then check the next commission lands against the right source.
6. Review earnings per click weeklyMake more of what earns; drop what doesn't.

Tracking Links by Channel

Reading Your Results

The most useful number is earnings per click (EPC): commissions divided by clicks for each source. A video with 2,000 clicks and $200 in commissions (EPC $0.10) is worth less per click than an email with 300 clicks and $150 (EPC $0.50), even though the video "looks" bigger.

For paid traffic, compare EPC with your cost per click. If you pay $0.40 a click and earn $0.30, scaling just loses money faster.

Common Problems and Rules to Respect

• Numbers don't match the network. Bots, repeat clicks and redirect chains cause gaps. Keep links direct and use one tracker as your reference.
• Cookie windows. If a buyer purchases after the merchant's cookie expires, no tracker can recover that commission.
• Program terms. Some programs restrict cloaking, redirects or bidding on brand names in ads. Read the terms before you build links. Our cloaking guide covers this.
• Disclosure. Tell readers you earn commissions, as most programs and advertising rules require.