Fortis Bank Nederland, the Dutch state-owned bank, has agreed to sell its tax administration and structuring business to Waterland, a Dutch private equity house, following an auction that was buffeted by a growing international clampdown on tax havens.

The sale of Fortis Intertrust, expected to close by the end of the year, will come as a relief to the Dutch government, which had become uncomfortable owning a business dedicated to helping companies and rich individuals pay as little tax as possible, often using offshore vehicles.