A guilty plea in a tax case related to the ongoing criminal investigation of U.S. clients of UBS AG is expected later on Monday, a government official told Reuters.

The plea is expected to be entered in a case pending in federal court in Seattle, according to the source familiar with the case. No further details were immediately available.

The development comes as U.S. officials examine about 250 names of American clients obtained in a February settlement of a U.S. probe against the Swiss banking giant. The bank paid $780 million to settle that case.

A separate tax amnesty program offered by the U.S. Internal Revenue Service, that runs through October 15, also is encouraging tax evaders to come forward to officials, lawyers have said.

(Reporting by Kim Dixon; Editing by Tim Dobbyn)

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