Life insurance, retirement accounts, payable-on-death accounts, and jointly held property pass directly to named beneficiaries or co-owners, outside of your will entirely. These are called non-probate assets.
Trouble begins when beneficiary designations are missing, outdated, or accidentally list the estate. In that situation, the asset falls back into the probate estate and is distributed under intestacy. Families frequently discover retirement accounts still naming a former partner, or with no beneficiary listed at all.
A complete estate plan reviews both probate and non-probate assets, aligning your will with your beneficiary designations so everything works together and nothing falls through the cracks.