What are the advantages of the customs union with Switzerland?

With regard to stamp duty, Liechtenstein funds are treated in the same way as Swiss funds. For investors who have placed their money in Switzerland, this generally results in a tax advantage when buying investment fund shares compared to funds domiciled in other countries outside of Switzerland.
Liechtenstein is the only fund domicile which can provide both EU passporting and stamp duty privileges. Fund founders who wish to offer their funds in both the EU and Switzerland can benefit from this particular advantage.