Learn how to write an inheritance sample letter to beneficiary with distribution details. Discover templates, examples, and a step-by-step guide.Trustee Accountings. Compelling Accountings for a Trustee: A Trust beneficiary has the right to retain an Accounting Lawyer. You would write a demand letter requesting an accounting, and a copy of the trust if you don't already have that. If beneficiaries refuse, the executor is free to file a Formal Accounting. TO: William C. Doe, Trustee under. I need a sample letter to request a formal accounting of an estate and of a trust that I am very confident the trustee.