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 Connecticut probate regardless of the trust. See how the numbers change in the Connecticut 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 on the town's land records, naming the trust as owner. This is the step most often skipped. Left undone, that property remains a probate asset — subject to full administration, the 150-day creditor process, and the Probate Court fee, regardless of the trust document sitting in a drawer.
2. Assuming funding also skips the Probate Court fee
This is a mistake of expectation rather than paperwork, but it matters just as much: even a trust that's funded correctly does not avoid the Connecticut Probate Court fee, since that fee's basis includes trust assets. Fund a Connecticut trust to skip probate itself, the creditor process, and fiduciary/attorney fees — not to escape the court fee, which follows the gross estate regardless.
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
Connecticut's small estate affidavit — $40,000 or less — 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 sit well above the threshold and require full probate, Probate Court fee included, regardless of the unused trust document.
A local probate attorney can review your estate — many offer a free consultation.