But not necessarily in the full proportion to what it's held.
Say you bought a property/investment for $100, and at the time of your death it was worth $100,000,100. You pass that property/investment on to your child, who decides to sell it for $200,000,100 after another 10 years.
With the estate tax, the first $100,000,000 gets taxed at your death, then the second ten years later as a capital gain.
Without the estate tax, only the second $100,000,000 gets taxed, as the child would not have to claim the capital gain from before he/she owned it.
I don't agree that the estate tax should be 40%, but should really fall under the same guidelines at capital gains. But there definitely should be some sort of action taken regarding capital gains at the handover to the next generation.