KDP processes billions of transactions across dozens of marketplaces. Errors happen — wrong royalty tiers, unauthorized tax withholdings, sales recorded without payment. Most authors never check because the data is buried in spreadsheets they don't have time to audit.
Units recorded as sold in your reports, but zero royalty paid. Returns misclassified as sales, or payments that simply fell through the cracks.
Titles priced in the 70% royalty tier ($2.99–$9.99) but paid at the 35% rate. One of the most common KDP errors — and one of the easiest to get corrected.
30% tax withholding applied even though your W-9 or W-8BEN is on file and current. This category has the highest correction rate when disputed with Amazon.
Scans every row for transactions where Amazon recorded a sale but paid $0 in royalties. Calculates the expected payout based on your list price, delivery cost, and applicable tier rate.
Checks every transaction against Amazon's published royalty rate schedule. Flags titles in the 70% tier range that were paid at 35%, calculating the exact difference per unit.
Identifies transactions with unauthorized 30% tax withholding. Cross-references the actual royalty against the expected amount to detect the withholding pattern, even when Amazon doesn't label it explicitly.
Cross-references your Kindle Unlimited page-read payments against published per-page rates across every marketplace. Includes a marketplace-level aggregate cross-check using your KENP and Summary sheets.
An ensemble of Isolation Forest, Local Outlier Factor, temporal drift analysis, and Benford's Law testing surfaces statistical anomalies that rule-based checks miss. All currencies converted at historical FX rates for accurate cross-marketplace comparison.
Your total estimated underpayment in USD, calculated across all marketplaces with historical FX conversion. See exactly how much Amazon may owe you.
Every anomaly grouped by error type — ghost sales, tier drift, tax withholding, KENP underpayments — with counts and estimated loss per category.
See which detection layers found anomalies and how many — rule-based counts, ML statistical outliers, temporal drift flags, and Benford's Law test results.
A downloadable PDF Gap Report with your full analysis, category breakdown, confidence scoring, and methodology summary. Accessible anytime via your unique report link.
Most KDP authors never check their royalty calculations. Those who do often find discrepancies. Upload your report and find out in under 90 seconds. If no gaps are found, your $19 is automatically refunded.
Analysis is for informational purposes only. Your data is encrypted at rest and processed securely.
The Royalty Scanner finds money you're already owed. The Contract Scanner makes sure you don't sign away money in the future. Upload any publishing, licensing, or service agreement and get a detailed risk analysis in under 60 seconds.
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