When are business taxes due? Learn key deadlines and extensions

Missing a tax deadline can throw off your cash flow, stall growth, and trigger expensive IRS penalties. For pros in trades like plumbing, HVAC, or electrical work, staying on top of these dates is part of running a steady, profitable operation—not just doing paperwork.

Your actual 2026 tax deadline depends on your business’s structure and whether you operate on a calendar or fiscal year.

This guide breaks down the essential federal tax deadlines for 2026 so you can plan ahead, set aside the right amount of cash, avoid surprises, and file with confidence.

Quick 2026 business tax deadline summary

If you run a calendar-year business, your main federal tax return will likely be due on March 16, 2026, or April 15, 2026, depending on your entity type. Most service-based pros also need to make quarterly estimated tax payments throughout the year, with key 2026 deadlines on April 15, June 15, and Sept. 15, followed by Jan. 15, 2027.

If you need more time to file, you can request a six-month extension. However, that extension only applies to submitting your return—not paying your taxes. You’re still required to estimate and pay what you owe by the original March or April deadline.

Beyond income taxes, you may also need to plan for Jan. 31 W-2 and 1099 deadlines, recurring payroll tax deposits if you have employees, and state-specific sales tax filing dates.

Table of contents

Main business tax deadlines for 2026

The two most important dates for business tax returns are March 16 and April 15. Most small to midsize home service businesses operate on a calendar year (January–December), which means their deadlines fall in the spring. If your business uses a fiscal year—any 12-month period that doesn’t end on Dec. 31—your deadline is typically the 15th day of the third or fourth month after your fiscal year ends.

Note: Because March 15, 2026, falls on a Sunday, the IRS moves the filing deadline for those entities to the next business day, which is Monday, March 16. (IRC Section 7503, explained in IRS Publication 509).

Here’s an overview of filing deadlines by business entity type:

Business type	Federal return due
Sole proprietorship	April 15
LLC (taxed as sole prop)	April 15
Partnership	March 16
S corporation	March 16
C corporation	April 15

Sole proprietorship tax deadlines

If you run your business alone with no employees or partners, the IRS views you and your business as a single entity. This simplifies your filing process because your business income is reported directly on your personal tax return.

• Deadline: April 15
• Forms: You’ll report your income and expenses on Schedule C, which is filed as part of your IRS Form 1040.
• Quarterly obligations: Since taxes aren’t automatically deducted from your earnings like a W-2 employee, you’ll need to send payments to the IRS four times per year if you expect to owe $1,000 or more.

Pro tip: To avoid a large bill in April, set aside a percentage of every invoice specifically for taxes. Using Housecall Pro’s Invoicing feature can help you track this income automatically. 

LLC tax deadlines

A Limited Liability Company (LLC) is a legal business structure, not a tax classification. When you form an LLC, part of the process is electing how you want the IRS to treat you for tax purposes. This determination dictates when your taxes are due.  

Single-member LLC (taxed as a sole proprietorship)

• Deadline: April 15.
• Forms: Filed on your personal Form 1040 using Schedule C.

Multi-member LLC (taxed as a partnership)

• Deadline: March 16.
• Forms: Filed using IRS Form 1065, with Schedule K-1 forms issued to each owner to file with their personal returns.*

LLC taxed as an S corporation

• Deadline: March 16.
• Forms: Filed using IRS Form 1120-S. Like partnerships, you’ll issue Schedule K-1s to owners.

LLC taxed as a C corporation

• Deadline: April 15.
• Forms: Filed using IRS Form 1120.

If your LLC does not elect to be taxed as a corporation, you will also receive 1099-NEC forms from customers who have paid your LLC more than $600 in that year.

Learn more: Advantages of an LLC vs. sole proprietorship

*Schedule K-1 is a tax form that shows your share of the business’s income, deductions, and credits that you’ll report on your personal tax return.

Partnership and S corporation tax deadlines

Partnerships and S corporations are “pass-through” entities, meaning they don’t pay corporate income tax themselves. Instead, the profits and losses “pass through” to the individual owners, who then report that information on their personal tax returns. This avoids the double taxation that C corporations face.

• Deadline: March 16.
• Forms: Partnerships file Form 1065; S corporations file Form 1120-S. Each issue Schedule K-1 to shareholders.
• Extension option: You can request an automatic six-month extension using Form 7004, which moves your paperwork deadline to September 15. However, individual owners must still pay any personal taxes owed by April 15.

C corporation tax deadlines

Unlike pass-through entities, a C corporation is a legal entity taxed separately from its owners. This can lead to double taxation, where the company pays taxes on its profits and shareholders also pay personal income tax on any dividends they receive.

• Deadline (calendar year): April 15.
• Deadline (fiscal year): The 15th day of the fourth month after its year-end.
• Forms: Filed using IRS Form 1120.

C corporations must make quarterly estimated tax payments if they expect to owe $500 or more in taxes.

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When are 2026 quarterly estimated taxes due?

If your business doesn’t withhold taxes from your pay, the IRS requires you to pay as you go throughout the year. These quarterly payments apply to most business structures, including sole proprietors, partners, and S corporation shareholders.

Quarter	Period covered	Payment Due Date
Q1	Jan. 1–March 31	April 15, 2026
Q2	April 1–May 31	June 15, 2026
Q3	June 1–Aug 31	Sept. 15, 2026
Q4	Sept. 1–Dec 31	Jan. 15, 2027

The IRS “safe harbor” rule—a threshold that protects you from penalties even if you underpay—can help you avoid surprise charges. Generally, if you pay at least 100% of last year’s total tax (or 90% of the current year’s tax), you won’t face underpayment penalties, even if you end up owing more when you file.

What happens if I miss an IRS quarterly tax payment?

Missing an estimated payment can trigger underpayment penalties and interest on the unpaid amounts. Making accurate quarterly payments depends on keeping up-to-date financial records. 

Housecall Pro Accounting keeps clean, accurate records of your income and expenses and helps you stay on top of estimated quarterly tax payments. You can generate custom reports, review profit and loss statements, and keep documentation ready in case of an IRS audit—without digging through spreadsheets.

Want to learn more about Housecall Pro Accounting? Book a call today for a personalized overview and free trial.

What other business tax deadlines should you know?

Income tax isn’t the only obligation for a home service pro. Depending on your team and location, you likely have other recurring deadlines to manage.

Payroll tax deadlines

If you have employees, you must deposit payroll taxes either monthly (for smaller payrolls) or semiweekly (for payrolls over $50,000). 

Payroll tax filings also require:

• Quarterly filing: IRS Form 941 is due the last day of the month following the end of each quarter.  
• Annual filing: IRS Form 940 (FUTA) is typically due by January 31. IRS Form 940.

Pro tip: The IRS has strict due dates for depositing these taxes. If you’re close to the threshold between monthly and semiweekly deposits, keep tabs in Housecall Pro Payroll so you don’t inadvertently miss a deadline.

Learn more: How to do payroll yourself: A step-by-step guide for small businesses

W-2 and 1099 deadlines

You must provide these forms to your workers and file copies with the government by Jan. 31. 

• W-2: For your direct employees.
• 1099-NEC: For contractors or subcontractors you paid $600 or more during the year. 

Sales tax deadlines

Sales tax deadlines vary significantly by state and your revenue level. Some states require monthly filings, while others move you to a quarterly or annual schedule as you grow. Always check with your state’s Department of Revenue to confirm your specific schedule.

How to file a tax extension for your business

If you aren’t ready to file by March or April, you can request an automatic six-month extension.

Here’s how to file:

1. Choose the correct form.

The right extension form depends on your business structure.

The table below shows extension forms and deadlines for each type of business:

Business type	Extension form	Extended deadline
Sole proprietor	Form 4868	Oct. 15
Single-member LLC	Form 4868	Oct.15
Multi-member LLC	Form 7004	Sept. 15
Partnership	Form 7004	Sept. 15
S corporation	Form 7004	Sept. 15
C Corp corporation	Form 7004	Oct. 15

2. Estimate what you owe.

An extension only applies to the paperwork, not the payment. Before you file the extension, calculate your expected tax liability for the year. Subtract any payments you’ve already made (like quarterly estimated payments). The remaining balance is what you owe.

If you underpay (or fail to pay at all) by the original deadline, penalties and interest may apply, even if you file the extension correctly. According to IRS Topic 301, the failure-to-pay penalty is 0.5% per month, and interest compounds daily on any unpaid balance.

3. Submit your extension by the original due date.

You can file electronically through your tax software, work with a Certified Public Accountant (CPA), or mail the paper form to the IRS. E-filing is typically faster and provides confirmation that the IRS received your request.

Remember that these are the original 2026 deadlines:

• March 16, 2026 (for partnerships and S corporations)
• April 15, 2026 (for sole proprietors and C corporations)

4. Pay what you owe.

You can submit payment electronically through IRS Direct Pay or the Electronic Federal Tax Payment System (EFTPS), or mail a check with your extension form. Paying online gives you a digital record of the transaction.

Once approved, your new filing deadline will generally be:

• Sept. 15, 2026 (for partnerships and S corporations)
• Oct. 15, 2026 (for sole proprietors and C corporations)

Even with an approved extension, you’re still responsible for accurate records and on-time payment. Keeping your books current throughout the year using tools like Housecall Pro makes it much easier to estimate what you owe and file without scrambling at the last minute.

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What happens if you miss a business tax deadline?

The IRS has strict deadlines for filing your business tax return, paying taxes owed, and making your quarterly payments.

Missing a deadline could result in:

Failure-to-file penalties

Generally 5% of the unpaid tax for each month or part of a month a tax return is late, capped at 25% of the unpaid tax (IRS Topic 653). For example, if you owe $10,000 and file three months late, you’d face a $1,500 penalty.

Failure-to-pay penalties

0.5% of your unpaid taxes for each month or part of a month the tax remains unpaid, capped at 25% (IRS Topic 653).  Using the same $10,000 example, that’s $50 per month, or $600 if you  pay a full year late.

Interest on unpaid tax

Interest compounds daily on unpaid taxes. As of Q1 2026, the rate is 7% per year for individuals. On a $10,000 balance, that adds roughly $700 in interest over 12 months—and it keeps accumulating until you pay in full. (Check current rates at IRS.gov/payments/quarterly-interest-rates).

Possible state-level penalties

Varies by state, as may deadlines.

Make it easier: Use Housecall Pro Accounting to store key documents, monitor income in real time, and stay ahead of quarterly payments. Always verify state-specific requirements with your state’s revenue agency.

How to stay ahead of business tax deadlines

The best way to handle tax season is to prepare for it all year long. When your bookkeeping is organized, filing is a routine task rather than a crisis. 

Housecall Pro Tax is designed specifically for trade professionals. Instead of scrambling for receipts in April, you can:

• Set recurring calendar reminders for key deadlines
• Create custom profit and loss statements
• Separate business and personal finances
• Keep organized expense records
• Manage your business payroll yourself
• Integrate with QuickBooks and other accounting software

Housecall Pro Tax offers year-round support from a tax advisor who understands the unique tax filing requirements for service-based businesses. Get tax filing guidance, ensure your filings are accurate, and book advisor meetings when it’s convenient for your schedule.

If you’re behind or aren’t sure if you have everything you need to file, our catch-up bookkeeping and tax return cleanup support can help you get current and stay compliant moving forward.

Learn more: Book a one-on-one introduction call with a Housecall Pro Tax professional.

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