Individual Retirement Accounts (IRA's) are great retirement vehicles. But they pose a danger to families doing estate planning. The danger is simple—if you handle it the wrong way, the income tax on an IRA can very quickly reach the highest tax bracket and deplete nearly 40% of the value. An IRA paid into an estate can also be subject to a 50% penalty under certain circumstances. If you want your IRA to go to your family without being depleted by taxes and penalties, read on.