text: I hope that question is not a serious one!\n\nIf you are in the U.S., the only "guaranteed" investment return is that of treasuries and even then you can lose to inflation.  \n\nThere does not exist a guaranteed return of 15%.  Finance 101 says that the greater the expected return, the greater the risk.  To achieve 15% requires risk which means it is not a guarantee.\n\nSorry to have to break this to you!