2025 Tax Filing Deadlines You Can't Afford to Miss
Key dates for the 2025 tax season including individual, business, and extension deadlines. Mark your calendar now.
This article is provided for general informational purposes by Eugene Solutions LLC. For personalized tax advice specific to your situation, please schedule a consultation with one of our licensed tax professionals.
In This Article
- 1. Why Tax Deadlines Matter More Than Ever
- 2. Q4 2025 Estimated Tax Payment — January 15, 2026
- 3. IRS E-File Opens — January 27, 2026
- 4. W-2 and 1099 Forms Due — January 31, 2026
- 5. Business Returns — March 15, 2026
- 6. Individual Returns & C-Corp Returns — April 15, 2026
- 7. Extension Deadlines — September & October 2026
Why Tax Deadlines Matter More Than Ever
Missing a tax deadline can trigger penalties, interest charges, and unnecessary stress. For the 2025 tax year (filed in early 2026), the IRS has established key dates that every individual and business taxpayer needs to know. Whether you're filing a simple W-2 return or a multi-entity business filing, understanding these dates is the first step to a smooth tax season. Eugene Solutions LLC tracks every deadline so our clients never pay a late-filing penalty.
Q4 2025 Estimated Tax Payment — January 15, 2026
If you're self-employed, a freelancer, or earn income that isn't subject to withholding (rental income, investment gains, side-gig earnings), your fourth-quarter estimated tax payment for 2025 is due on January 15, 2026. This payment covers income earned between October 1 and December 31, 2025. Use IRS Form 1040-ES to calculate your payment. Underpayment can result in penalties calculated on Form 2210. Eugene Solutions helps self-employed clients calculate accurate quarterly estimates to avoid any surprises.
IRS E-File Opens — January 27, 2026
The IRS is projected to begin accepting electronically filed 2025 tax returns on January 27, 2026. Filing early has significant advantages: you get your refund faster (typically 10–21 days with direct deposit and e-file), you reduce the window for identity thieves to file a fraudulent return in your name, and you beat the April rush. Eugene Solutions offers same-day e-filing for qualified returns — bring your documents in the morning, and we can file by end of day.
W-2 and 1099 Forms Due — January 31, 2026
Employers must furnish W-2 forms to employees and file them with the Social Security Administration by January 31, 2026. Similarly, businesses that paid independent contractors $600 or more must issue 1099-NEC forms by this date. If you're a small business owner, missing this deadline can result in penalties of $60 to $310 per form, depending on how late you file. Our bookkeeping team ensures your W-2 and 1099 filings are accurate and on time.
Business Returns — March 15, 2026
S-Corporations (Form 1120-S) and Partnerships (Form 1065) must file their returns by March 15, 2026. These entities also issue Schedule K-1 forms to their owners, which are needed to complete individual returns. Late filing penalties for business returns are steep: $220 per partner/shareholder per month, up to 12 months. If you need more time, file Form 7004 for an automatic 6-month extension — but remember, an extension to file is not an extension to pay.
Individual Returns & C-Corp Returns — April 15, 2026
The most important date on the tax calendar: April 15, 2026 is the deadline for individual Form 1040 returns and C-Corporation Form 1120 returns. This is also the deadline for your first-quarter 2026 estimated tax payment. If you can't file by April 15, you can request an automatic 6-month extension using Form 4868, which moves your filing deadline to October 15, 2026. However, you must pay any estimated tax owed by April 15 to avoid interest and penalties.
Extension Deadlines — September & October 2026
Extended S-Corp and Partnership returns are due September 15, 2026, along with the third-quarter estimated payment. Extended individual and C-Corp returns are due October 15, 2026. If you filed an extension, don't wait until the last minute — the closer you get to the deadline, the harder it is to get an appointment with a qualified preparer. Schedule your review appointment with Eugene Solutions at least 2–3 weeks before the extension deadline.
Key Takeaways
- January 15: Q4 2025 estimated payment due
- January 27: IRS e-file season opens
- January 31: W-2 and 1099-NEC due to recipients
- March 15: S-Corp and Partnership returns due
- April 15: Individual 1040 and C-Corp 1120 returns due
- October 15: Extended individual and C-Corp returns due
- File early to get refunds faster and prevent identity theft
Ready to Take Action?
Don't risk penalties. Schedule your 2025 tax appointment with Eugene Solutions today.
Our team of PTIN-verified, IRS-authorized tax professionals publishes weekly insights to help individuals and businesses navigate the tax code. Serving all 50 states virtually with physical offices in the Southeast.
IRS Circular 230 Disclosure: Eugene Solutions LLC provides this content for general informational purposes. It does not constitute tax, legal, or accounting advice. Individual tax situations vary. Consult a qualified tax professional for advice specific to your circumstances. Eugene Solutions LLC is subject to IRS Circular 230 professional standards.
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