Quick answer: the most common mistake is never recording a new act of transfer for real estate into the trust's name. It's still the family's own responsibility, and skipping it means that property goes through full Louisiana succession regardless of the trust. See how the numbers change in the Louisiana succession vs living trust calculator.
Signing ≠ funding
1. Real estate act of transfer never recorded — the #1 mistake
Moving Louisiana real estate into a trust requires a formal act of transfer, executed before a notary and recorded in the parish conveyance records. This is the step most often skipped. Left undone, that property remains a succession asset — subject to the representative fee and the full succession process, regardless of the trust document sitting unused.
2. Financial accounts left titled individually
Bank and brokerage accounts don't join a trust automatically. Each one has to be retitled into the trust's name, or the institution needs a copy of the trust document plus a change-of-ownership form. Accounts opened after the trust was created are especially easy to forget.
3. Assets acquired after the trust was created
A trust only holds what's actually been transferred into it. A car, account, or property acquired afterward stays outside the trust unless someone deliberately adds it — which is why periodic review matters as much as the initial funding.
4. Forgetting forced heirship in the plan itself
This isn't a funding mistake in the technical sense, but it produces a similar disappointment: a trust that's fully signed and fully funded can still fail to work as the family expected if it doesn't account for a forced heir's legitime under La. Civ. Code art. 1493. That has to be built into the plan from the start, not discovered afterward.
5. Treating the small succession affidavit as a safety net
Louisiana's small succession affidavit — $200,000 or less, Louisiana domiciliary, no real estate — is a genuine shortcut for modest, unfunded assets. It is not a backstop for a house or a sizeable account left outside the trust by mistake; those situations still require a full succession regardless of the unused trust document.
A local probate attorney can review your estate — many offer a free consultation.