Three ways: (1) Tax deductible and tax deferred(2) After tax and, (3.) tax free. All are good ways. When you are young and getting started, tax deductible and tax deferred, will give you the quickest rewards. Your income taxes will go down and you will see your account increase speedily. But once you are older, you will wish you had more of the tax free income you are earning in a Roth account or the dividends and capital gains you are earning in the "after tax" account.Those three type of accounts will give you many options both before and in retirement. Let us show you how.