According to a BBC article Becker escapes jail for tax evasion,
Boris Becker has been sentenced to two years’ probation by a Munich court for failing to pay millions of euros in German taxes. The suspended sentence fell short of the prosecution’s demands that the former tennis champion be given a three-and-a-half year jail sentence…The case revolved around the prosecution’s allegation that Mr Becker had maintained a residence in Munich while claiming to live in the tax haven of Monaco.
His get out of jail card cost him though–a cool 3 million Euros. According to Becker he could not be accused of criminal scheming as the apartment – his sister’s loft – and he stayed there only occasionally. That’s a pretty expensive loft.