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Find your notice. Find your deadline.
Every letter the IRS sends carries a number in the upper right corner and a date. Those two things determine what your options are and how long they last. Some of these clocks cannot be restarted once they run out.
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Which notice do you have?
Your notice date governs.
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Choose the notice you received. This shows the deadline that applies, what it controls, and what remains possible once it has passed.
This describes general statutory periods and is not legal advice about your matter. Deadlines run from the date printed on the notice, and some carry different periods — a Notice of Deficiency addressed to a person outside the United States allows 150 days rather than 90.
