I am a resident of and rent a safe deposit box in the State of Arizona. Upon my death will my safe deposit box be seized and will there be state and/or federal taxes levied on the contents of this safe deposit box? My son is a signer for the box and is also Executor on my Will. Thank you.

AZ no longer has an estate tax, nor an inheritance tax or gift tax, so they have no need to seize your safe deposit box upon your death. In general upon your death any co-signers of your safe deposit box must inform the bank. The executor is responsible for making an inventory of the contents of the box, and if any federal estate tax is due the contents of the safe deposit box should be included in the listing of assets. But no one "siezes" the box.

There is no tax on inheritances. For more information read: Your U.S. Tax Return: Tax on Inheritances

Since your son is cosigner he will be able to operate the safe deposit, so there will not be any problem. You should also mention in your will about safe deposit.

After death the safe deposit goods become your estate. It is taxable only if your estate is over 2 million.