Definition
A way for two or more people to own an asset together in equal shares where, when one owner dies, that owner's share passes automatically to the surviving owner or owners. The transfer happens outside probate and overrides anything a will says. It is the default titling for many married couples' homes and joint accounts, and it differs from tenancy in common, where each owner's share passes through their will.
Why it matters
Survivorship titling is a simple probate shortcut, but it also gives every co-owner full exposure to the others: a co-owner's creditors, divorce, or lawsuit can reach the asset, and adding a non-spouse can count as a taxable gift. For a non-spouse co-owner, only the deceased's share gets a step-up in basis.