Home Individual Taxes 2023 Estate and Fiduciary Forms 2023 Estate and Fiduciary Forms Fiduciary Tax Forms Number Title Description 504D Fiduciary Declaration of Estimated Income Tax Form and instructions for a fiduciary to file and pay estimated taxes for tax year 2022 if the fiduciary is required to file a Maryland Fiduciary Income Tax return and the taxable income is expected to develop a tax of more than $500