Four more Swiss banks have reached an agreement with the US Department of Justice over charges of assisting their American clients evade tax.

Standard Chartered Bank (Switzerland), now in liquidation, is to pay $6.337 million; Banque Internationale à Luxembourg (Suisse), $9.71 million; Zuger Kantonalbank, $3.798 million; and Banque Bonhôte will pay $624,000.

The four banks, which between them had offices in Geneva, Neuchâtel, Zug and Zurich, were found guilty of “opening, maintaining, servicing and profiting” from accounts that were held or beneficially owned by US ta...