Austin Small Business Tax Deadlines: A Guide to Business Tax Preparation

Knowing which tax deadlines apply to your Austin small business can help you avoid costly penalties and stay organized throughout the year. Business tax preparation in Austin, TX, is not just a once-a-year task; it is a year-round discipline built on understanding when payments are due, what happens when you miss them, and how to plan ahead. This guide covers the key federal and Texas-specific deadlines that small business owners in Austin, TX, may want to track.

Your Quarterly Estimated Tax Payment Calendar

Quarterly estimated payments are due four times a year. Self-employed business owners and those operating pass-through entities, such as S-corporations, partnerships, and LLCs taxed as partnerships, generally must pay estimated federal income tax throughout the year rather than in a single lump sum at filing. The four standard due dates are:

▸ Q1 (January 1 to March 31): April 15.

▸ Q2 (April 1 to May 31): June 16.

▸ Q3 (June 1 to August 31): September 15.

▸ Q4 (September 1 to December 31): January 15 of the following year.

The September 15 Q3 payment and the January 15 Q4 payment tend to catch Austin small business owners off guard. Missing either one can trigger an IRS underpayment penalty calculated as a percentage of the amount that should have been paid, with interest accumulating from the original due date. Many business owners assume they can pay everything at year-end, but that approach often results in a penalty even when the annual return is filed on time.

If you are not yet tracking these four dates, August is a good moment to start. Working with a firm that specializes in business tax preparation and tax filing services can help you stay on top of these dates without letting them slip.

Annual Return Deadlines by Entity Type

Annual filing deadlines vary depending on how your business is organized. The IRS typically sets the failure-to-file penalty at 5% of unpaid taxes per month, up to 25% of the total balance owed. Key annual deadlines for Austin small businesses include:

▸ S-corporations and partnerships (Forms 1120-S and 1065): March 15.

▸ C-corporations (Form 1120): April 15.

▸ Sole proprietors and single-member LLCs (Schedule C on Form 1040): April 15.



Automatic six-month extensions are available for each entity type, but an extension gives you more time to file, not more time to pay. Any tax owed is still due by the original deadline, and paying late may result in a failure-to-pay penalty and interest on the outstanding balance.

What Happens If You Miss an Annual Filing Deadline?

The IRS applies two separate penalties for late returns: failure-to-file and failure-to-pay. These can run concurrently, meaning the financial cost adds up quickly. Filing on time, even if you cannot pay the full amount, generally reduces total penalty exposure. Consistent business tax preparation throughout the year makes it far less likely that a deadline will be missed.

The Texas Franchise Tax Deadline: A Local Requirement to Know

Proactive business tax preparation in Austin, TX, must account for this state-level obligation that most national small business tax content overlooks. 

The Texas franchise tax applies to most entities operating in Texas, including LLCs, corporations, and partnerships, regardless of whether the business turned a profit. The standard annual deadline is May 15. A no-tax-due report is still required for entities that fall below the revenue threshold. Missing the May 15 deadline may result in a 5% penalty on tax owed, with an additional 5% if payment is still not made within 30 days.

This deadline falls in the weeks immediately following the federal April 15 season, so it can get overlooked when business owners assume their tax obligations are finished for the year.

Payroll Tax Obligations Throughout the Year

Businesses with employees face a separate layer of filing and deposit requirements. Payroll taxes must generally be deposited on a monthly or semi-weekly schedule depending on prior-year liability. Key payroll-related filings include:

▸ Form 941 (Employer's Quarterly Federal Tax Return): Due April 30, July 31, October 31, and January 31.

▸ Form 940 (Federal Unemployment Tax): Due January 31 for the prior calendar year.

▸ W-2 forms to employees: Due January 31.

Falling behind on payroll deposits can result in a Trust Fund Recovery Penalty, which the IRS can assess personally against business owners and certain employees. Consistent, timely attention throughout the year is significantly less costly than catching up after the fact.

Why Getting Ahead of Deadlines Matters More Than Just Filing on Time

Business tax preparation works best when connected to year-round planning rather than treated as a single filing event. Knowing your deadlines in advance allows you to set aside funds for estimated payments, avoid surprise balances at year-end, and capture available deductions before the filing window closes.

For Austin small business owners, early fall is a practical window to confirm estimated payment obligations are on track and begin gathering records for annual returns. Sound business tax preparation practices adopted now may reduce stress significantly when January arrives.

Ready to Get Your Austin Business on Track Before Year-End?

Wood, Johnson, Heath serves Austin and the surrounding Central Texas communities as a trusted tax and accounting services firm with decades of experience supporting small business owners. Explore the firm's business tax preparation services to learn how proactive preparation and planning work together, or visit the business tax prep and planning page for additional resources on tax filing services available to Austin businesses. To schedule a consultation, contact the team directly or call (512) 343-8075.