"Everything" you need will include your income documents like your W-2's and any of the over a dozen kinds of 1099's that will not be issued until late January/early February by employers, businesses and financial institutions. You will need to carefully accumulate those items as they arrive in your mailbox, or know the accounts and user ID's in order to import them. And you might also need to collect your mortgage and property tax information, your medical bills, etc. etc. etc.
Tax Preparation Checklist
https://turbotax.intuit.com/tax-tips/tax-planning-and-checklists/tax-preparation-checklist/L7LHiDqGJ
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
