why do you have to declare “large” sums of cash money crossing over borders?

Question

I put large in quotes because rules vary, but it seems if I have alot of cash and want to travel and spend it somewhere I should be able to take it with me.

In: 0

Answer 1

“They” want to know if you paid taxes on it or not. If you have, all is good. If you have not, they want to know why not.