First of all, do you mean RMB when you say money? I hope you can be sure that if the money in your hand is RMB, you must first convert it into foreign currency (in fact, it is the world's major currencies, such as US dollar, Euro, Japanese yen and Hong Kong dollar, which is the currency of the country where you want to deposit it). In this process, you will experience the foreign currency and exchange rate policy of CN since the reform and opening up (especially since 1994). If you want to raise the foreign currency interest rate abroad, you should need the proof of local residents (that is, citizens of other countries), so this method will not work. I understand your purpose. In fact, there is no need to save money abroad. You only need to speculate in foreign exchange, and your goal will be achieved. Financial derivatives can be used to operate in the foreign exchange market.
I've said a little too much. In response to your question, firstly, is the interest rate high in foreign countries or in China? A: No matter whether foreign interest rates are high or China's interest rates are high, the government and speculators will discount and raise the premium in the foreign exchange market. You can understand it this way-basically the same.
As for the second question-as long as you have income, you have to pay taxes.