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"The IRS and Justice Department cooperate to catch tax scofflaws, including having notorious ones arrested if they land on U.S. soil. See Government Accountability Office Report: Potential For Using Passport Issuance to Increase Collection of Unpaid Taxes. But this is only in awfully serious tax matters. These days discussion is focused on more mundane tax debts and the other end of travel: when can the IRS prevent you from leaving?
Stopping a U.S. citizen from traveling because of tax debts is in the limelight as noted here, Owe IRS Taxes, Lose Your Passport, and more recently here: Forget Travel if You Owe the IRS. At the moment this is a proposed law not yet enacted. Yet it is stirring up considerable controversy..."
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