Aug 16, 2026 · 6 min read

How to Check for Amazon Affiliate Underpayment

If your Amazon Associates earnings look lower than your clicks and conversions say they should, you don't have to guess. In 2026, rate changes rolled out with no public changelog, milestone bonuses were removed, and the halo commission on cart-wide purchases ended April 14. That combination means "did I get paid right?" is now a real question for every affiliate — and it's one you can answer from your own data in a few minutes.

Why underpayment is plausible in 2026

Silent rate changes. Categories reportedly dropped by up to 50% (e.g., 10% → 4–5%) with no category-by-category announcement. If your report still shows an older rate, or Amazon applied a new rate to an older order, lines can pay less than expected.
Halo commission removed. Since April 14, you only earn on the exact ASIN you linked. The other items a shopper added to their cart no longer pay — a cut that never shows up on any rate table.
Reduced reporting. Less item-level detail makes a silent shortfall harder to notice from the summary view.
Bonus removal. Milestone bonuses that padded high-volume months are gone.

Signs you should check

Earnings per click (EPC) fell while clicks stayed flat. That's the classic signature of a rate or tracking change, not a traffic problem.
A commission rate on your report line looks lower than the current rate table for that category and date.
Your monthly payout shrank with the same or better sales volume.

How to check, step by step

Export the data. In Associates Central go to Reports → Product Earnings Report and download the CSV for the period you want to check.
Compare each line against the correct rate. For every line, expected commission ≈ total price × commission rate for that category and order date. Anything clearly below that is a candidate.
Exclude legitimate deductions. Returns reverse commission, fees appear as adjustments, and shipping-only orders don't earn. A good check separates these from genuine flags.
Total the shortfall. Sum the flagged lines and group by category so you know where the loss concentrates.

This exact process is what our free earnings audit automates. You upload your CSV once, and it runs entirely in your browser — no upload, no account, no sign-up. It compares each line against the applicable 2026 rate, excludes returns and ambiguous rows, and gives you a flagged list plus a shortfall total.

What to do if you find a gap

Save the flagged lines (order ID, date, product, expected vs. paid).
Check a second period to confirm it's a pattern, not a one-off.
Contact Amazon Associates support with your export and the specific lines. There's no guarantee, but a concrete order-level list is far stronger than a vague "my earnings dropped."

Frequently asked questions

Is Amazon actually underpaying affiliates?

Usually not deliberately. In 2026 rate changes rolled out without a public category-by-category changelog, and the April 14 halo change silently removed cart-wide income — so the rate applied to your order can be lower than the rate that existed when you referred the sale.

How do I check if I was underpaid?

Export your Product Earnings Report CSV, then compare each line's commission against the correct rate for that category and order date. Any line below expectation is a possible underpayment. An AmzLoss audit does this automatically in your browser.

How long does an underpayment check take?

A few minutes. Download the CSV, run the audit, and you get a list of flagged lines plus a total shortfall estimate — no account, no upload.

What's the difference between a flag and a confirmed error?

Flags are candidates, not proof. Returns, fees, and delayed shipping legitimately reduce commission, so trustworthy checks exclude those rows and only surface lines that clear a confidence threshold.

Can I claim money Amazon didn't pay?

You can open a support ticket with your evidence, but there is no guarantee of payment. An audit gives you the exact lines and amounts to show them.

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