When Are Business Taxes Due 2026: Complete Deadline Calendar

Published: February 22, 2026 Tax Year: 2026

A Message from Slava

The first year I ran a business in the US, I was shocked by how many different tax deadlines existed. In the UK, where I built Anna Money for 60,000+ small businesses, the tax calendar is relatively straightforward — one main deadline for self-assessment, quarterly VAT returns, and that's mostly it.

In the US, you're dealing with quarterly estimated taxes, annual returns with different deadlines depending on your entity type, 1099 filing deadlines, payroll deposits that can be monthly or semi-weekly, and state deadlines on top of all of it. Miss one, and the IRS charges interest and penalties. Miss several, and the costs compound quickly.

The problem isn't that any single deadline is hard to remember. The problem is that there are so many of them, spread throughout the year, and each one has different rules about extensions, penalties, and who it applies to. I've watched business owners who are brilliant at their craft — developers, designers, consultants — get tripped up by the sheer volume of compliance dates.

This guide puts every 2026 business tax deadline into a single calendar. Print it, bookmark it, or set calendar reminders for each date. Knowing when taxes are due is the first step to never paying a penalty.

---

Executive Summary: 2026 Business Tax Deadlines at a Glance

Legal basis: IRC §6072 (time for filing), IRC §6654 (underpayment of estimated tax), IRS Publication 509 (Tax Calendars)

---

---

Quarterly Estimated Tax Payments: The Dates That Matter Most

For most self-employed individuals, freelancers, and small business owners, quarterly estimated tax payments are the deadlines you'll interact with most frequently. If you expect to owe $1,000 or more in taxes for the year (after subtracting withholding and credits), you must pay estimated taxes.

2026 Quarterly Due Dates

*June 15 falls on a Sunday in 2026, so the deadline moves to Monday, June 16.

Note: The quarters aren't evenly divided. Q2 covers only two months (April–May), while Q3 covers three (June–August). Plan your payments accordingly.

How Much to Pay Each Quarter

There are two safe harbor methods to avoid underpayment penalties:

Method 1: 90% of current year tax. Pay at least 90% of what you'll owe for 2026, divided into four equal payments.

Method 2: 100% of prior year tax (110% if AGI > $150,000). Pay the same total amount you owed last year, divided into four payments. This works even if your income increases — you won't be penalized as long as you meet the prior-year threshold.

Use the Quarterly Tax Calculator to estimate your payments based on your income.

How to Pay

• IRS Direct Pay (irs.gov/payments) — free bank transfer
• EFTPS (Electronic Federal Tax Payment System) — required for businesses with payroll
• IRS2Go app — mobile payments
• Credit/debit card — through third-party processors (fees apply)
• Check or money order — mail with Form 1040-ES voucher

What Happens If You Miss a Quarterly Payment

The IRS charges an underpayment penalty calculated at the federal short-term interest rate plus 3 percentage points, compounded daily. The penalty applies to each quarter individually — so even if you catch up later in the year, you'll owe a penalty for the quarter you missed.

---

Annual Tax Return Deadlines by Entity Type

Different business structures have different filing deadlines. Here's a breakdown.

Sole Proprietors and Single-Member LLCs

Form: Schedule C (attached to Form 1040) Original deadline: April 15, 2026 Extended deadline: October 15, 2026 (file Form 4868)

As a sole proprietor or single-member LLC (not electing S-Corp treatment), your business income is reported on Schedule C as part of your personal tax return. The deadline is the same as the individual tax return deadline: April 15.

If you need more time, file Form 4868 by April 15 for an automatic 6-month extension to October 15. Remember: the extension gives you more time to file, not more time to pay. Any estimated tax owed must still be paid by April 15 to avoid interest and penalties.

S-Corporations

Form: Form 1120-S Original deadline: March 16, 2026* Extended deadline: September 15, 2026 (file Form 7004)

*March 15 falls on a Sunday in 2026, so the deadline moves to Monday, March 16.

S-Corps file one month before the individual return deadline. This is intentional — the S-Corp return generates K-1 forms that shareholders need to complete their personal returns.

S-Corp shareholders then report their share of income on their personal returns (due April 15). If the S-Corp return is late, K-1s are delayed, and shareholders may need to request extensions on their personal returns.

Late filing penalty: $235 per shareholder per month (or fraction of a month) the return is late, for up to 12 months. For a 2-shareholder S-Corp that's 3 months late, that's 2 × $235 × 3 = $1,410.

Partnerships and Multi-Member LLCs

Form: Form 1065 Original deadline: March 16, 2026* Extended deadline: September 15, 2026 (file Form 7004)

*Same as S-Corps — March 15 falls on Sunday, so the deadline is March 16.

Partnerships follow the same timeline as S-Corps and for the same reason: K-1s must reach partners in time for individual filing. The late filing penalty structure is identical — $235 per partner per month.

C-Corporations

Form: Form 1120 Original deadline: April 15, 2026 Extended deadline: October 15, 2026 (file Form 7004)

C-Corps with a calendar year-end file by April 15 — the same date as individual returns. C-Corps with fiscal year-ends file by the 15th day of the 4th month after the fiscal year ends.

Late filing penalty: 5% of unpaid tax per month (or fraction of a month), up to 25%. If the return is more than 60 days late, the minimum penalty is the lesser of $510 or 100% of the unpaid tax.

Summary: Annual Return Deadlines

---

1099 Filing Deadlines

If your business pays contractors or makes other reportable payments, you have 1099 filing obligations with their own deadlines.

Key 1099 Dates for 2026

For a detailed breakdown of penalties and correction procedures, see our 1099 Filing Deadlines and Penalties Guide.

Reporting threshold changes for 2026:

• 1099-NEC: $2,000 (raised from $600 by OBBBA, effective for payments made in 2026)
• 1099-K: $20,000 + 200 transactions (reverted to pre-ARPA threshold by OBBBA)

---

Payroll Tax Deadlines

If you have employees, payroll taxes add another set of deadlines to your calendar.

Form 941: Quarterly Federal Tax Return

*January 31 falls on a Sunday, so the deadline moves to February 1.

Payroll Tax Deposits

The frequency of your payroll tax deposits depends on your total tax liability:

• Monthly depositors (less than $50,000 in payroll taxes during the lookback period): Deposit by the 15th of the following month
• Semi-weekly depositors ($50,000 or more): Deposit within 1-3 business days of payday, depending on payday
• Next-day deposit rule: If you accumulate $100,000 or more in payroll taxes on any day, deposit by the next business day

Form 940: Annual Federal Unemployment Tax (FUTA)

Deadline: February 2, 2027 (for tax year 2026)

If your FUTA tax liability exceeds $500 for any quarter, you must make quarterly deposits by the last day of the month following the quarter-end.

---

Extension Deadlines: What They Cover and What They Don't

Filing for an extension is common and carries no stigma — the IRS processes millions of extension requests each year. But understanding what an extension does and doesn't do is critical.

What an Extension Gives You

• More time to file your return (typically 6 months)
• No penalty for late filing if the extension is filed on time
• Peace of mind if you're waiting on K-1s, corrected 1099s, or other documents

What an Extension Does NOT Give You

• More time to pay taxes — estimated tax is still due by the original deadline
• Protection from interest — interest accrues on unpaid tax from the original deadline
• Extended deadline for estimated payments — quarterly payments are still due on their original dates

Extension Forms

How to File an Extension

1. Individual (Form 4868): File electronically through IRS Free File, tax software, or a tax professional. You can also make a payment and designate it as an extension payment — the IRS treats this as an automatic extension request.
2. Business (Form 7004): E-file through your tax software or a tax professional. Must be filed by the original return deadline.

---

The Complete 2026 Business Tax Calendar

Here's every major federal business tax deadline for 2026, organized chronologically.

January 2026

February 2026

March 2026

April 2026

May 2026

June 2026

July 2026

August 2026

September 2026

October 2026

November–December 2026

No major federal business tax deadlines.

January 2027

---

State Tax Deadlines: They Vary

This guide covers federal deadlines. State tax deadlines add another layer of complexity.

General Patterns

• Most states follow the federal deadline for individual and business returns (April 15 for individuals, March 15 for S-Corps/partnerships)
• Some states have different deadlines: For example, some states require estimated tax payments on different dates
• State 1099 filing: Many states participate in the Combined Federal/State Filing Program — your federal 1099 filing is automatically forwarded to participating states. Non-participating states may require separate filing

States With No Income Tax

If your business operates in one of the following states, you don't have a state income tax return deadline (though other taxes may still apply):

• Alaska, Florida, Nevada, New Hampshire (interest/dividends only), South Dakota, Tennessee, Texas, Washington, Wyoming

What to Check

1. Your state's individual income tax return deadline
2. Your state's business entity return deadline (if different from federal)
3. Whether your state requires separate estimated tax payments
4. Your state's 1099 filing requirements and participation in CF/SF

---

Common Mistakes to Avoid

1. Treating an Extension as an Extension to Pay

This is the most expensive mistake. An extension to file is not an extension to pay. If you owe $10,000 and file an extension without paying, you'll owe interest (currently around 7-8% annually) plus a late payment penalty of 0.5% per month on the unpaid amount.

What to do instead: Estimate your tax liability and pay at least 90% by the original deadline, even if you file for an extension.

2. Missing the S-Corp / Partnership Deadline

S-Corps and partnerships file a month earlier than individual returns (March 16 vs. April 15 in 2026). New S-Corp and partnership owners often assume their business return is due April 15 — and get hit with the $235-per-shareholder-per-month penalty.

3. Not Adjusting for Weekend/Holiday Shifts

When a deadline falls on a Saturday, Sunday, or federal holiday, it moves to the next business day. In 2026, this affects:

• January 31 → February 2 (Saturday)
• March 15 → March 16 (Sunday)
• June 15 → June 16 (Sunday)

Always verify the actual due date, not just the statutory date.

4. Skipping Q2 Because It's Only Two Months

The Q2 estimated tax payment covers only April and May, but the payment is still based on one-quarter of your annual estimated liability (if using the equal payment method). Some self-employed people skip Q2 because their income for those two months seems low — then face underpayment penalties.

5. Forgetting About Payroll Tax Deposit Deadlines

Payroll tax deposits are the most frequent tax deadline you'll face. Missing a deposit triggers a tiered penalty: 2% (1-5 days late), 5% (6-15 days late), 10% (16+ days late), or 15% (more than 10 days after first IRS notice). These penalties apply to the entire deposit amount.

---

How Jupid Keeps Your Tax Deadlines on Track

When you're running a business, keeping track of quarterly estimated payments on top of running day-to-day operations is a challenge. Jupid solves this by connecting to your bank accounts and automatically categorizing your income and expenses with 95.9% accuracy — so you always know where you stand financially.

Instead of guessing how much to pay each quarter, Jupid tracks your actual income in real time. The AI calculates your estimated tax liability based on your current-year earnings, deductions, and filing status. When a quarterly payment is due, you know the number — no spreadsheets, no manual calculations.

Jupid's WhatsApp and iMessage AI accountant means you can check your tax status from anywhere. Ask "What's my estimated tax bill for Q2?" and get an answer based on your actual bank transactions, not a rough guess.

For business owners paying contractors, Jupid tracks those payments throughout the year so you know exactly who needs a 1099 and how much they were paid — well before the February deadline hits.

Connect your bank to Jupid and stop guessing about deadlines and payment amounts.

---

Action Checklist

Set Up (Do This Once)

• Add all 2026 tax deadlines to your calendar with reminders (2 weeks before + 3 days before)
• Determine your entity type's filing deadline (March 16 or April 15)
• Set up an IRS account at irs.gov for online payments
• Register for EFTPS if you have payroll obligations
• Connect your bank accounts to Jupid for automatic tracking

Each Quarter

• Calculate estimated tax payment using the Quarterly Tax Calculator
• Make estimated tax payment by the due date (Apr 15, Jun 16, Sep 15, Jan 15)
• File Form 941 if you have employees (Apr 30, Jul 31, Oct 31, Feb 1)
• Review year-to-date income to adjust remaining quarterly payments

Year-End

• Collect W-9s from any new contractors
• Prepare 1099-NECs and W-2s for January/February filing
• Gather documents for annual return (income, expenses, depreciation)
• Decide whether to file on time or request an extension
• If extending, estimate and pay any remaining tax liability by the original deadline

---

Resources and Citations

IRS Publications (Official Sources)

• IRS Publication 509 — Tax Calendars for 2026 (the official deadline reference)
• IRS: Estimated Tax for Individuals — Who must pay and when
• Form 1040-ES — Estimated Tax for Individuals
• Form 7004 — Application for Automatic Extension (business returns)
• Form 4868 — Application for Automatic Extension (individual returns)
• IRS: About Form 941 — Employer's Quarterly Federal Tax Return

Tax Code

• IRC §6072 — Time for filing income tax returns
• IRC §6654 — Failure to pay estimated income tax (underpayment penalty)
• IRC §6655 — Failure to pay estimated income tax by corporations
• IRC §6651 — Failure to file / failure to pay penalties
• IRC §7503 — When a deadline falls on Saturday, Sunday, or holiday

2026 Key Numbers

---

Final Thoughts

Business tax deadlines in the US are spread across the entire year, and missing even one can trigger penalties that add up quickly. The most important dates for most small business owners are the four quarterly estimated payments and your annual return deadline — which depends on how your business is structured.

Set your calendar reminders now, pay as you earn throughout the year, and you'll avoid the penalties that catch so many first-time business owners off guard.

---

Disclaimer

This article provides general information about 2026 business tax deadlines and should not be considered tax advice. Tax deadlines can shift when they fall on weekends or holidays, and specific deadlines may differ for fiscal-year filers, certain entity types, or businesses in special circumstances. State deadlines vary and are not fully covered here. For advice specific to your situation, consult with a qualified tax professional or refer to IRS Publication 509 for the official tax calendar.

Tax Year: 2026 Last Updated: February 22, 2026