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Every date that matters, verified against the IRS and state revenue departments. Filing and extension deadlines, estimated-tax due dates, information returns like the 1099 and the W-2, state annual registration and the weekend and holiday rules that move a date. Each article shows when it was verified.
The last 2026 federal estimated payment is due Friday, January 15, 2027. Who has to pay, how safe harbor works, and why your state has its own rules.
October 8, 2026 · 6 min read
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