A trust is required to file an income tax return (Form 1041) if its gross income, including proceeds from the sale of assets, exceeds $100 during its fiscal year ($300 if all income is required to be distributed). A charitable remainder trust or charitable lead trust must file Form 5227.
Depending on the terms of the trust, it may also be necessary to:
Track beneficiary balances for a separate share trust
Calculate accounting income and required distributions
Prepare Forms 706-GS for distributions to skip persons from a trust with an inclusion ration of greater than zero
Calculate required state withholding on distributed state sourced income to beneficiaries who are residents of other states
Income allocation from the preparation of the final 1040 if initial year for a testamentary trust
Prior year tax returns
Will and/or Trust documents
Account statements, tax documents, and check registers
Beneficiary name, address, social security number
Due date: April 15 for calendar year trusts (most are)
A 3 month extension is available for Form 5227 and a 5 month extension is available for Form 1041.