How Affiliate Tracking and Commissions Work
Cookie-Based Tracking Explained
The core technology behind affiliate tracking is the browser cookie. When a visitor clicks your affiliate link, two things happen simultaneously: the visitor is redirected to the merchant's website, and a small text file (the cookie) is stored in their browser. This cookie contains your affiliate ID, a timestamp, and sometimes additional data like the specific product or campaign that generated the click. When the visitor completes a purchase on the merchant's site, the merchant's checkout system reads the cookie, identifies you as the referrer, and records the commission.
Cookie duration, also called cookie life or cookie window, determines how long after a click the merchant will still credit you for a sale. Amazon Associates uses a 24-hour cookie, meaning the visitor must purchase within 24 hours of clicking your link. ShareASale merchants commonly use 30-day cookies. Many software and SaaS affiliate programs use 60 to 90-day cookies. Some programs offer 365-day or lifetime cookies that credit you for any purchase the referred visitor ever makes, regardless of when it happens. Longer cookie durations are more valuable because they capture purchases from visitors who research for days or weeks before buying, which is common for expensive products.
Cookie overwrites are an important nuance. If a visitor clicks your affiliate link and then later clicks a different affiliate's link for the same merchant, the second cookie typically overwrites yours, and the second affiliate gets credit for the sale. This "last click wins" model is the standard in most affiliate programs and networks. It means that your content needs to be the last affiliate touchpoint before purchase, which is why review and comparison content targeting visitors at the final decision stage converts so effectively.
Attribution Models Beyond Last Click
While last-click attribution dominates affiliate marketing, some programs and networks use alternative models. First-click attribution credits the affiliate who first introduced the customer to the merchant, regardless of subsequent clicks through other affiliates. This model rewards content that creates initial awareness, like educational articles and social media posts that introduce a brand to new audiences. A few programs, particularly in the software space, use first-click attribution because they value customer acquisition over last-touch influence.
Multi-touch or linear attribution splits the commission among all affiliates who touched the customer during their journey. If a customer clicked three different affiliate links before purchasing, each affiliate might receive one-third of the commission. This model is rare because it is complex to implement and produces smaller per-affiliate payouts, but some enterprise programs use it to fairly compensate affiliates at different stages of the buyer journey.
Coupon code tracking assigns commissions based on which affiliate's unique coupon code the customer uses at checkout, regardless of cookies. This method is increasingly important because browser privacy changes, ad blockers, and cross-device browsing can prevent cookie-based tracking from working correctly. If a visitor reads your review on their phone, then purchases on their laptop, the cookie from your phone click does not exist on their laptop. But if they remember and apply your unique coupon code, you still receive credit. Request a unique coupon code from programs that support them, especially for products where the decision-to-purchase gap is likely longer than the cookie duration.
Commission Structures
Percentage-of-sale commissions pay you a fixed percentage of the product's sale price. Amazon pays 1 to 10 percent depending on the category. ShareASale merchants typically pay 5 to 20 percent. Digital product programs (courses, software, ebooks) pay 20 to 50 percent because digital products have near-zero marginal cost. The percentage applies to the product price, not including tax or shipping in most programs. For a 10 percent commission on a $200 product, you earn $20 per sale.
Flat-fee commissions pay a fixed dollar amount per qualifying action regardless of the order value. Web hosting programs commonly use flat fees: SiteGround pays $50 to $150 per signup, Bluehost pays $65, and WP Engine pays $200. Flat fees are predictable and often more lucrative than percentage commissions for products with consistent pricing. A flat $100 commission beats 5 percent of a $200 product ($10), but falls behind 5 percent of a $5,000 product ($250).
Recurring commissions pay you monthly for as long as the customer you referred maintains their subscription. A 30 percent recurring commission on a $50/month subscription pays $15 every month that the customer remains subscribed. After 12 months, that single referral has generated $180 in commissions. Recurring programs are the most valuable commission structure for building long-term passive income because each new referral adds to your monthly income permanently (minus natural customer churn).
Tiered commissions increase your rate as you generate more sales within a period. A program might pay 5 percent on your first 10 sales per month, 7 percent on sales 11 through 50, and 10 percent on all sales above 50. Tiered structures incentivize volume and reward top-performing affiliates with significantly higher earnings per sale. Amazon Associates uses a volume-based bounty system for certain programs, and many direct merchant programs offer tiered commission increases as you prove your value as a traffic source.
Tracking IDs and Sub-IDs
Tracking IDs (also called sub-IDs, SIDs, or click IDs) are custom parameters you add to your affiliate links to identify which specific content, page, or campaign generated each click and conversion. Most affiliate networks support sub-ID tracking, and using it is essential for optimizing your affiliate strategy because it reveals which articles, link placements, and content formats drive the most revenue.
Create a systematic sub-ID naming convention before you start placing links. A common format is: sitename-pagetype-articleslug-linkposition. For example, "mysite-review-vitamix5200-cta1" tells you the click came from your site, from a review article about the Vitamix 5200, from the first call-to-action link. When you check your affiliate dashboard and see that "mysite-roundup-bestblenders-table" generates 3 times the clicks of "mysite-roundup-bestblenders-textlink," you know that your comparison table converts better than your in-text links, and you can apply that insight across all your roundup articles.
Amazon Associates supports tracking IDs through its tag system, allowing you to create up to 100 different tracking tags and assign them to different content types or articles. ShareASale, CJ Affiliate, and Impact all support sub-ID parameters in their affiliate link structure. Set up tracking IDs from day one, because retroactively adding them means losing historical data about which content performs best.
Payment Schedules and Thresholds
Each affiliate program and network has its own payment schedule and minimum payout threshold. Amazon Associates pays approximately 60 days after the end of the month in which commissions were earned (March commissions pay in late May), with a $10 minimum for direct deposit and gift cards. ShareASale pays on the 20th of each month for the previous month's commissions, with a $50 minimum. CJ Affiliate pays on the 20th or 28th with a $50 minimum for direct deposit. Impact processes payments based on individual merchant terms, typically Net 30 or Net 60 after the conversion date.
Understanding the payment delay is important for cash flow planning, especially when starting out. A sale you generate on January 15 might not pay until March 20, meaning there is a 60 to 90 day gap between earning a commission and receiving the money. As your monthly commissions grow and stabilize, this delay becomes less noticeable because each month's payment represents a consistent revenue stream, but in the early months it can feel like the money will never arrive.
Commission reversals happen when a customer returns a product or cancels a subscription during the merchant's return window. If a customer buys a product through your link and returns it 14 days later, the commission is reversed and deducted from your next payment. Reversal rates vary by product category, typically 5 to 15 percent for physical products and 10 to 25 percent for software trials (where customers sign up for free trials and cancel before paying). Track your reversal rates by program to understand your true net commission income and identify programs with unusually high reversal rates that might not be worth promoting.
Verifying Your Tracking Is Working
Test every affiliate link before publishing content. Click the link yourself (using a private/incognito browser window to avoid cookie conflicts with your own affiliate account), verify that it redirects to the correct product page on the merchant's site, and check your affiliate dashboard to confirm the click was recorded. Some dashboards show clicks in real time while others have a 1 to 24 hour delay, so check back if the click does not appear immediately.
Monitor your click-to-conversion ratio regularly. If an article generates 500 affiliate clicks per month but zero conversions, something is wrong with your tracking, the product page, or the link itself. A healthy conversion rate from affiliate click to purchase ranges from 2 to 10 percent depending on the product and price point. A sudden drop in conversion rate without a corresponding change in your content suggests a tracking issue, a broken link, or a change on the merchant's side (like a product going out of stock or a landing page redesign that hurts conversions).
Cross-reference your own click tracking (from your affiliate link management plugin) with the network's reported clicks. Significant discrepancies, where your plugin shows 1,000 clicks but the network reports only 600, indicate tracking loss from ad blockers, cookie rejection, or technical issues. Some tracking loss is normal (10 to 20 percent due to ad blockers and browser privacy settings), but larger gaps warrant investigation. Using the right affiliate tools helps you identify and minimize tracking discrepancies that cost you commissions.