This guide provides details on various IRS tax forms, including Form 1040, the standard income tax form, and its specialized versions like 1040-SR for seniors, 1040-ES for individuals with non-withheld income, and 1040-NR for nonresident aliens. Form 1040-PR caters to self-employed Puerto Rico residents, while Form 56 notifies the IRS of an entity’s fiduciary responsibilities. Estate tax is dealt with using Form 706, and excise taxes are reported with Form 720. To request tax refunds or abate charges, Form 843 is used, and employer tax liabilities are reported through Forms 940, 941, and 944 for annual and quarterly taxes. The guide emphasizes the importance of consulting tax professionals or the IRS, and links are provided for each form’s detailed information.