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 Hawaii probate — and loses the fast, trustee-driven creditor cutoff a funded trust would have had. See how the numbers change in the Hawaii 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, naming the trust as owner. This is the step most often skipped. Left undone, that property remains a probate asset — subject to the full Circuit Court process, regardless of the trust document sitting in a drawer.
2. The Hawaii-specific cost: losing the trustee-notice shortcut
Hawaii's rule letting a trustee independently publish notice to creditors and get the same 4-month bar a personal representative gets under § 560:3-801(f) only protects assets the trust actually holds. An asset left outside the trust doesn't get that fast, independent creditor cutoff at all — it falls back into the ordinary probate process, with its own separate notice and claim deadlines.
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. Treating the small estate routes as a safety net
Hawaii's small estate affidavit and clerk-administration options — both capped at $100,000, personal property only — are genuine shortcuts for modest, unfunded assets. Neither is a backstop for a house or a sizeable account left outside the trust by mistake; those amounts require full probate, regardless of the unused trust document.
A local probate attorney can review your estate — many offer a free consultation.