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Reviewed October 17, 2026. Covers selected U.S. federal, New York, New Jersey, Connecticut, Florida and California deadlines for calendar-year taxpayers and plans. Dates in 2027–2030 are projections under current rules, not a guarantee that future official calendars will remain unchanged. Ordinary filing and payment deadlines move forward for applicable weekends and holidays, including the District of Columbia’s Emancipation Day for federal deadlines. Year-end planning reminders stay on their stated calendar date.

• Extensions generally give additional time to file, not to pay. IRA contribution deadlines generally do not follow a filing extension; SEP deadlines follow the employer’s applicable return due date and valid extension.
• PTET is available in most states, with different election and payment rules. New York uses a current-year March election. NJ BAIT uses the original prior-year return deadline. CT and CA allow an election on a timely original return, including a valid extension. Florida has no comparable elective PTET deadline listed.
• Sales tax entries cover assigned monthly, quarterly and annual schedules, plus FL semiannual, CA fiscal annual and CA prepayments. NJ monthly entries are conditional ST-51 remittances. NY part-quarterly / PrompTax and other special schedules are not included. FL electronic payment initiation is listed separately. Payroll deposits, fiscal-year income-tax returns and special situations can have additional dates.
• For solo 401(k)s, Form 5500-EZ applies where an annual report is required. The small-plan exemption and final-year filing rules must be reviewed.
• Disaster relief, special extensions, state holidays and later law changes may alter individual deadlines. Confirm applicability with your advisor.

IRS tax calendars · New York tax calendar · Retirement plan reporting. Each deadline also links to its official guidance.