What to send your tax pro before busy season: a document checklist
Busy season arrives on the same calendar every year, and the same documents arrive late every year: K-1s, corrected 1099s, closing statements, basis schedules sitting in someone's personal email, foreign account statements that "will come later." A return can only be as accurate as the documents behind it. The households that file cleanly are the ones that assembled the pack before January. This post is a document checklist for the 2026 tax year (returns filed in 2027) for households with more than one state, entity, or income stream. It covers what to gather, how to organize it, and when to send it. Your preparer may want more or less. Ask them, and use this list to fill the gaps. Why "we'll send everything in March" fails A household with one W-2 can survive late documents. A household with pass-through investments, a trust, foreign accounts, a household employee, non-cash charitable gifts, and returns in three states cannot. Late documents create thr...