We here at Cleer try to make taxes less painful all around.
We created this 2026 Tax Deadlines Calendar for Startups – C-Corps, Partnerships, and S-Corps – so you can stay on top of your filing requirements and have this handy at-a-glance infographic to add a little color to your tax year!
We can’t change the 2026 tax deadlines, but we can change the calendar you use!
2026 Tax Deadlines
February 2nd – Payments for employees and independent contractors
- 1099-NEC
- 1099-MISC
- 1099-K
- W-2& W-3
March 1 – C-Corporation Delaware Franchise Tax and Annual Report filing and payment due
- Calculated by shares issued & assets at year end.
March 16 – S-Corporation (Form 1120-S) and Partnership (Form 1065) returns and extensions due
- File an extension to avoid penalties on a per-partner, per month basis.
- IRS assessing penalties on late 8805s & 1042 for dividends and owner payouts
April 15 – Individual (Form 1040) and C-Corporation (Form 1120) tax returns and extensions due, as well as first quarter estimated tax payments for 2026
June 1 – LLC Delaware Franchise Tax Fee payment due
June 15 – Second quarter estimated tax payments for 2026 due
September 15 – Third quarter estimated tax payments for 2026 due and the extended deadline for S-Corp and Partnership returns
October 15 – Extended deadline for Individual and C-Corporation returns
December 15 – Fourth quarter estimated tax payments due
Fiscal Deadlines
The standard Federal tax deadline, if not using the Dec 31st year-end date, is 3.5 months after the end of the month in which the tax year ends.
One exception- tax years that end in June have a Sept 15th due date. (June 30th is Australia’s year-end, so a lot of companies that have their US fiscal year match their Australian activities can be affected by this.
Common fiscal years: We also see March 30th for UK-related companies, and January 31st for tech companies that want to emulate Salesforce.
Dissolution: When companies close, they use a fiscal year-end date for their deadlines after the month they dissolve with the state.
Penalties
Your business may face the following penalties if you miss any applicable 2026 tax deadlines. $25k for 5472 late-filing (corp inc tax) $10k for 5471, FBAR, 8938 foreign banking, per month penalties partnerships & S-corps, DE late filing both a fee and a %, late-filing fees for corporate tax owed, late payment penalties, state late filing penalties
Can Cleer Tax Help Me Meet All 2026 Tax Deadlines?
Absolutely! At Cleer Tax, our dedicated team is committed to addressing the distinct requirements of your business.
We provide comprehensive tax advisory services tailored to your specific needs, covering every aspect of compliance and optimization – including filing all 2026 tax deadlines. Our goal is to ensure that you capitalize on every available opportunity, leaving no stone unturned when maximizing your tax benefits and minimizing any potential liabilities.
Cleer provides Corporate Income Tax Packages encompassing federal and state income tax filings for a hassle-free experience. Our accurate, affordable, and efficient financial and tax services are tailor-made for U.S. businesses and subsidiaries to help entrepreneurs do it right from the start.
We also offer monthly bookkeeping packages, which include your monthly statements. If you need help getting up to date on your books, we also offer support for companies that have fallen behind on their bookkeeping with our bookkeeping catch-up package.
If you need any help with reducing your tax liability or your company’s bookkeeping needs, feel free to contact us. For more information, you can also visit our pricing page.
