A multinational tax haven is a special place where companies can go to pay less taxes on the money they make in different countries. It's like a secret hideout for money!
Let's say a big company makes a lot of money in different countries, but each country has its own tax rules and the company would have to pay a lot of money in taxes if they followed all of them. So the company finds a country that has very low taxes or special tax laws that make it a good place to stash their money.
This country is called a "tax haven" because it offers a safe place for companies to keep their money without having to pay as much in taxes. It's like a secret club, but instead of having a secret handshake or password, you just have to be really rich.
Because of this, many big companies use multinational tax havens to keep their money safe and pay less in taxes. This can lead to problems, though, because the countries where the money was actually made miss out on taxes that could have helped schools, roads, and other important things.
In short, multinational tax havens are places where companies go to pay less taxes and keep their money safe. But, it can also be a bad thing for the countries where the money was actually made.