Hi there,
It’s time for a quick refresher on key 2025 deadlines, including a few that are easy to overlook.
April 15, 2026:
- Individual tax returns
- C-Corp returns, even if you had zero income or a loss
- Single-Member LLC returns
- Quarterly Estimated Taxes (Q1 2026) – due if you:
- Are self-employed, a freelancer, or contractor
- Receive significant bonuses, RSUs, stock options, or other equity compensation
- Consistently owe when you file – if you owed for 2025 and expect to owe again, the IRS requires you to either adjust your withholding or make estimated payments. Penalties apply if you miss this.
March 16, 2026:
- S-Corp tax returns (Form 1120-S)
- Multi-Member LLC returns (Form 1065)
This deadline often catches newer business owners by surprise and the penalties can be steep (typically around $245 per member per month for late filings), so it’s crucial not to miss it. Remember, this deadline applies even if your business lost money
📝 Important Notes
- If you own any business entity – whether it’s an LLC, S-Corp, or C-Corp – you generally need to file, even if the business had no activity or operated at a loss.
- Delaware entities: If your business is registered in Delaware, your annual report and franchise tax are due by March 1, 2026.
- All Colorado LLCs must file a separate Periodic Report each year, even if there was no income or activity. Missing this deadline can lead to late fees and the LLC being marked Delinquent, which can lead to dissolution.
Want a Quick List of Last-Minute Deductions?
If you’d like an updated checklist of deductions, some of which you can still claim for 2025, just reply to this email and I’ll send it over. Time is Running Out
If you need help filing your personal or business return, or handling your 2026 quarterly estimates, please reply to this email by the end of the week so we can make sure your filings are handled on time. Our availability and rates may change as we get closer to the deadlines.
If you’re already squared away for both your 2025 return and your 2026 estimated payments, thank you for reading!
Sincerely,
—
George Dimov, CPA
Licensed and Insured
(833) 829-1120 toll free
(212) 994-8081 Fax
www.dimovtax.com