Former Labour MP Jane Griffiths has been arrested in London after failing to appear at a court hearing last week.
Ms Griffiths was de-selected by her constituency party last year
Ms Griffiths is alleged to have failed to pay a tax bill of £29,000.
A warrant for the arrest of the former Reading East MP, who was elected in 1997, was issued by the district judge in the case.
Ms Griffiths became the first Labour MP in a decade to be de-selected by her local party in 2004. Labour lost the seat to the Conservatives in May.