16/09/2026
After today, the clock doesn’t stop. It just changes.
Extended S-corp and partnership returns due September 15 spit out K-1s that feed personal returns racing toward October 15. Messy books don’t just make a late entity return. They make a wrong K-1 — and then a personal mess a month later when the owner’s CPA asks questions nobody can answer from the ledger.
A client of ours — an LA business attorney — thought the entity filing was “the CPA’s problem.”
His draws, loans, and reimbursements still didn’t match the books. The draft K-1 was going to invent a story the bank couldn’t back. That’s how October gets expensive even when September “got filed.”
We cleaned the books first: bank recs, owner activity, payroll ties, then a clean handoff so the K-1 matched reality instead of last year’s guess.
Books first. Return second. Personal return last.
If your entity return went out today and you can’t explain every number on the draft K-1, what happens to your personal return in four weeks?