Tax Deadline Calendar
Every IRS deadline in chronological order. Click any date to see who it affects, what to prepare, and the cost of being late.
IRS Deadlines Throughout the Year
Every deadline below carries penalties if missed. Click any item to expand the full breakdown.
Overview
Final deadline for Individual (Form 1040) and C-Corp (Form 1120) returns that filed an extension in April. After today, the failure-to-file penalty begins accumulating on any unpaid balance.
Who This Affects
- Anyone who filed Form 4868 in April for a personal extension
- C-Corporations on extension
- Taxpayers waiting on amended or late K-1s
- Anyone still gathering documentation from April
What to Prepare
- All final K-1s from partnerships and S-Corps
- Any corrections or reclassifications from your bookkeeper
- Roth IRA and traditional IRA contribution confirmations
- Final estimated tax payment for any remaining balance
Cost of Missing This Deadline
The 5% per month failure-to-file penalty kicks in immediately on any unpaid balance after October 15. If you owe $20,000 and file November 15, the penalty alone is $1,000 for one month — before interest.
We track every deadline and send reminders 30, 14, and 3 days before.
Do Not Want to Track These Yourself?
When you partner with Fiscal Integrity Group, we handle every deadline, extension, and estimated payment for you. You run your business; we manage the calendar.
Tax Deadline Alerts
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Contact Information
11400 West Olympic Blvd
Los Angeles, CA 90064
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Sat: By appointment
Sun: Closed