Taxes are one of the few things in life that don’t wait—and in 2025, missing a tax deadline can cost your business or household both money and peace of mind. Whether you’re a small business owner, a freelancer, or simply filing your individual return, knowing what’s due and when is essential.
In this blog, we outline the key IRS and state tax deadlines for 2025—month by month—and share practical reminders to help you stay compliant and avoid last-minute stress.
Missing a tax deadline can lead to:
Even worse, it can disrupt cash flow if you’re hit with surprise payments. That’s why a proactive calendar and timely preparation are your best allies.
Below is a breakdown of the most important IRS deadlines you should mark on your calendar.
JANUARY 15, 2025
Q4 Estimated Tax Payment for 2024 (Form 1040-ES)
If you’re self-employed or have untaxed income (like investments or rental income), this is your final payment for 2024.
JANUARY 31, 2025
W-2s and 1099s Due to Recipients and IRS
You must furnish copies of:
MARCH 15, 2025
S Corporation and Partnership Returns (Form 1120-S and 1065)
If your business is taxed as an S-Corp or Partnership, this is the deadline to file your annual return.
APRIL 15, 2025
This is the big day for most filers. Several deadlines converge here:
1. Individual Tax Return (Form 1040)
File your federal personal income tax return for 2024 or request an extension using Form 4868.
2. C Corporation Tax Return (Form 1120)
For corporations with a calendar year-end, Form 1120 is due.
3. Q1 Estimated Taxes for 2025
Start your new year right by paying your first estimated tax installment.
Tip: Even if you file an extension, payment is still due by April 15 to avoid interest.
JUNE 17, 2025
Q2 Estimated Taxes for 2025
Make your second quarterly payment if you’re required to pay estimated taxes.
Tip: Use the IRS EFTPS system to schedule payments in advance and avoid surprises.
SEPTEMBER 15, 2025
1. Q3 Estimated Taxes for 2025
Due for self-employed individuals and other taxpayers paying quarterly.
2. Extended Returns for Partnerships and S-Corps
If you filed for a 6-month extension back in March, this is your final due date.
Tip: Consider scheduling a review with your accountant mid-year to adjust your estimated payments if income has shifted.
OCTOBER 15, 2025
Extended Individual Returns Due
If you filed Form 4868 in April, this is your final deadline to submit your personal return for 2024.
Reminder: Extensions only delay filing, not payment.
OTHER SPECIAL DEADLINES TO WATCH
How to Stay on Top of It All
With so many deadlines, it’s easy to lose track. Here’s how to stay organized:
Create a Centralized Tax Calendar
Include due dates, prep periods, and internal deadlines for gathering documents.
Work With a Bookkeeper or CPA
They’ll keep you compliant and flag potential red flags before they become IRS problems.
Use Software with Tax Reminders
Cloud-based tools like QuickBooks, Xero, or Gusto help automate compliance reminders.
Set Up EFTPS or IRS Direct Pay
This helps you pay electronically and maintain a digital audit trail.
Schedule Quarterly Check-ins
A 30-minute review every 3 months can save hours during tax season.
Mistakes happen. If you miss a filing or payment, don’t panic—take action:
For business owners, tax deadlines are not just about compliance—they’re tied to:
Tax planning isn’t a year-end task. It’s a year-round strategy that supports operational stability and strategic growth.
The best time to plan for tax deadlines was yesterday. The second-best time is today.
Staying ahead of key IRS due dates ensures that you file on time, pay accurately, and focus on building your business or securing your personal finances—not scrambling for last-minute forms.
With proper bookkeeping, a proactive CPA, and a clear calendar, 2025 can be your smoothest tax year yet.
If you’re building something important and need a trusted financial partner to grow with you – we’d love to hear from you.
DWG CPA PLLC is a Texas-based accounting firm serving businesses and nonprofits since 2005. We specialize in virtual accounting, tax strategies, and personalized financial guidance across industries like healthcare, construction, real estate, and nonprofits.
Copyright 2025 DWG CPA PLLC. All Rights Reserved.