Quick answer: the most common mistake is never recording a new deed into the trust's name for real estate. It's still the family's own responsibility, and skipping it means that property goes through full Iowa probate regardless of the trust. See how the numbers change in the Iowa probate vs living trust calculator.
Signing ≠ funding
1. Real estate deed never recorded — the #1 mistake
Moving real estate into a trust requires a new deed, signed and recorded with the county recorder, naming the trust as owner. This is the step most often skipped. Left undone, that property remains a probate asset — subject to full administration and the same stacked fee schedule the trust was meant to avoid, regardless of the trust document sitting in a drawer.
2. Forgetting the fee schedule stacks in Iowa specifically
This is a mistake of expectation, but it matters: an unfunded asset in Iowa doesn't just face one probate fee — it can face the SAME 6/4/2% ceiling applied separately to both the executor (§ 633.197) and the attorney (§ 633.198). A single unfunded, sizeable asset can quietly reproduce the exact cost the whole trust was set up to avoid.
3. 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.
4. 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.
5. Treating the small estate affidavit as a safety net
Iowa's small estate affidavit — personal property of $100,000 or less, 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 amounts require regular probate or Chapter 635 administration, regardless of the unused trust document.
A local probate attorney can review your estate — many offer a free consultation.