Deloitte has become the latest of the big four to get involved in a wave of professional services deals, acquiring the boutique tax specialist KD Johns & Company which will make the post-merger firm the state's biggest accounting partnership.

Deloitte has become the latest of the big four to get involved in a wave of professional services deals, acquiring the boutique tax specialist KD Johns & Company which will make the post-merger firm the state's biggest accounting partnership.