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... The report from the Taxpayer Inspector General for Tax Administration is the first major examination of the Trump administration's controversial effort to identify and deport undocumented immigrants using taxpayer information. It comes more than a year after ICE asked the IRS to share confidential information, including Taxpayer Identification Numbers and last known addresses, on more than 1.2 million people. The effort, which is the subject of ongoing litigation in multiple federal courts, yielded address matches for about 47,000 individuals.

The IRS admitted in February it improperly shared address data in "less than five percent" of those cases, after ICE submitted insufficient or incomplete information on a taxpayer.

The inspector general's report Monday found that the systems the IRS used to match ICE data "were unable to identify and match the records accurately and consistently." ...