Japan has a system called the Inheritance-time Production Taxation System. This system allows tax on property donated during one's lifetime to be settled later.
As an example, suppose you gifted 10 million yen to your son at the age of 60.
At that time, if you use the settlement taxation system at the time of inheritance, no tax will be imposed immediately.
Thereafter, when the person who gave the gift passes away, whether or not tax will be imposed on that 10 million yen will be calculated.
In Japan, there is no tax on estates up to at least 36 million yen.
So there is a possibility that even if you give a large amount of money to a donor during his/her lifetime, it will not be taxed.
For example, in the following two cases, the tax will be different even though the amount is the same (50million yen)
Parents increase 40 million yen to 50 million yen through investment and donate it (tax is calculated on 50 million).
Parents gift 40 million yen to their children, and the children increase the amount to 50 million yen through investment (tax is calculated on 40 million).
In Japan, tax is calculated based on the amount of the gift.
Therefore, if the gift is made after the amount has increased, the tax rate will naturally be higher.
If the child is able to invest well, it may be more advantageous to make the gift before death.
Conversely, since the value of Japanese real estate declines, it is more likely that taxes will be lower if the gift is made to the child after a certain period of time has passed.
It is difficult to make a general statement because it depends on various circumstances. I will continue to consider the best course of action as I learn more.