Not funding your living trust.

Too much JTWROS property.

Leaving too many assets to a surviving spouse.

Not equalizing assets through gifts between spouses.

Not having a will.

Improper ownership of life insurance.

Being donor and custodian of a uniform-gift-to-minors-act/uniform-transfer-to-minors-act account.

Not knowing where all the "stuff" is.

Naming the wrong executor.

Not periodically updating an estate plan.

This list should be a helpful reference as you fine-tune your estate plan or work with estate planning experts to create your estate plan for the first time.