2026 Tax Calendar
Never miss an IRS deadline. Use our comprehensive calendar to track quarterly payments, corporate filing dates, and strategic year-end planning milestones.
Annual Tax Cycle
Track your progress through the tax year's major milestones.
January 15, 2027
Individuals & Sole PropsQ4 Estimated Tax Payment Due
Final quarterly estimated tax payment for the 2026 tax year. Consequence of missing: Penalty for underpayment of estimated tax, which accrues interest daily on the shortfall.
January 31, 2027
Business EntitiesW-2 and 1099-NEC Deadline
Deadline to issue W-2s to employees and 1099-NEC forms to independent contractors. Consequence of missing: Penalties range from $60 to $330+ per form depending on how late they are, plus potential intentional disregard penalties of $660+ per form.
March 15, 2027
Business EntitiesS-Corp & Partnership Returns Due
Deadline for S-Corporations (Form 1120-S) and Partnerships (Form 1065) to file or request an extension. Consequence of missing: Late filing penalty is $235 per month, per partner/shareholder, for up to 12 months.
April 15, 2027
All TaxpayersIndividual & C-Corp Tax Deadline
Deadline for Individual returns (Form 1040), C-Corp returns (Form 1120), and Q1 2027 Estimated Tax Payment. Consequence of missing: Failure-to-file penalty (5% of unpaid taxes per month) and failure-to-pay penalty (0.5% per month), plus interest.
June 15, 2026
Individuals & Sole PropsQ2 Estimated Tax Payment Due
Second quarterly estimated tax payment for the 2026 tax year. Consequence of missing: Underpayment penalties and interest charges applied to the Q2 shortfall.
September 15, 2026
Business EntitiesExtended S-Corp & Partnership Deadline
Final deadline for S-Corps and Partnerships that filed an extension. Q3 Estimated Tax Payment also due. Consequence of missing: Same as March 16 ($235/month per partner/shareholder), plus potential loss of S-Corp status or severe audit scrutiny if chronically late.
October 15, 2026
All TaxpayersExtended Individual & C-Corp Deadline
Final deadline for Individual and C-Corp returns that filed an extension. Consequence of missing: 5% per month failure-to-file penalty kicks in immediately on unpaid balances, plus ongoing 0.5% failure-to-pay penalties.
December 31, 2026
Strategic PlanningYear-End Tax Planning Deadline
Last day to make tax-deductible purchases, charitable contributions, or establish certain retirement accounts for 2026. Consequence of missing: Missed opportunities. You cannot retroactively fund most 401(k)s, make Section 179 purchases, or claim charitable deductions for the year. The consequence is paying permanently higher taxes.
Don't Want to Track These Yourself?
When you partner with Fiscal Integrity Group, we handle all deadlines, extensions, and estimated payments for you. You run your business; we manage the calendar.
Tax Deadline Alerts
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(951) 888-3245Office
11400 West Olympic Blvd
Los Angeles, CA 90064
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Saturday by appointment | Sunday closed.
