The IRS can learn about online gambling winnings through information returns filed by regulated US sportsbooks, routine bank‑account monitoring, and broader financial‑transaction reporting systems. When you withdraw from a licensed domestic book into a US bank account, large or frequent transfers can be visible to regulators, and certain thresholds may trigger automatic reports under federal anti‑money‑laundering rules. Even if offshore sites like BookMaker.eu do not directly report to the IRS, taxpayers are still obligated to self‑report gambling income on their returns. Audits, lifestyle reviews, and mismatches between known income sources and observed spending can all prompt deeper questions, so accurate record‑keeping and honest reporting remain the safest approach.
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