The October 15 Tax Deadline Is Coming: What Business Owners Need to Do Now
For many business owners, the arrival of September means the final stretch of the year is already in sight. But before you start thinking about year-end planning, there is another important date to put on your calendar: October 15, 2026.
For taxpayers who received an extension for their 2025 federal income tax return, October 15 is generally the final deadline to file. An extension gives you additional time to file your return—it does not give you additional time to pay taxes that were already due.
If you own a small business and your return was extended, now is the time to stop putting it off. Waiting until October can turn a manageable tax filing into a stressful scramble.
Who Needs to Be Thinking About October 15 Tax Deadline?
The October 15 deadline primarily applies to individuals who received an extension to file their 2025 federal income tax return. This can include business owners whose business income is reported on their personal return, such as owners of:
Sole proprietorships
Partnerships
S corporations
Single-member LLCs
Other pass-through businesses
The exact filing requirements can vary depending on your business structure and tax situation.
If you filed for an extension earlier this year, don't assume that your tax return is automatically taken care of. The extension simply gave you more time to complete and submit the return.
Start Gathering Your Documents Now
One of the biggest causes of last-minute tax stress is missing information.
Rather than waiting for your accountant to ask for documents one at a time, start gathering everything you may need now.
Depending on your business and personal tax situation, this may include:
Profit and loss statements
Balance sheets
Bank and credit card statements
Payroll records
1099s and W-2s
Business expense documentation
Mileage and vehicle records
Depreciation information
Equipment and asset purchases
Business loan information
Estimated tax payment records
Investment and retirement account information
Charitable contribution records
Mortgage and property tax information
Any notices received from the IRS or state tax authorities
If you use a bookkeeper or accounting software, September is also a good time to make sure your books are reconciled and your financial records are complete.
Don't Forget About Your State Tax Return
Federal taxes aren't the only thing that matters.
Depending on where you live and where your business operates, you may have state and local filing requirements as well. Georgia business owners, for example, may have additional state tax considerations that need to be addressed.
Your federal extension does not necessarily mean every state filing requirement has been extended in exactly the same way.
This is one reason it is important to work with an accounting professional who understands the tax requirements that apply to your particular situation.
An Extension Doesn't Mean You Can Wait to Pay
This is one of the most important things business owners need to understand about tax extensions.
An extension to file is not an extension to pay.
If you owed taxes when your original return was due, interest and potentially penalties can accrue on unpaid amounts even though you received an extension to file.
If you are unsure whether you paid enough toward your 2025 tax liability, don't wait until October to find out.
A tax professional can review your situation and help you understand where you stand.
Common Last-Minute Tax Mistakes
Waiting until the last minute can lead to more than stress. It can also increase the possibility of mistakes.
Here are a few common problems business owners should try to avoid.
1. Incomplete bookkeeping
If your books aren't reconciled, your tax return may be based on incomplete or inaccurate information.
2. Missing deductions
Business owners sometimes overlook legitimate expenses simply because they don't have their records organized.
3. Mixing personal and business expenses
Using personal accounts or credit cards for business expenses can make recordkeeping much more difficult and may complicate the tax preparation process.
4. Forgetting estimated tax payments
Make sure all estimated tax payments have been properly documented and accounted for.
5. Waiting too long to ask questions
If you discover an issue in September, there is still time to address it. Discovering the same issue a few days before October 15 is a very different situation.
September Is Also a Good Time to Start Planning for 2026
Your tax return isn't just about what happened last year.
The information in your 2025 return can also provide valuable insight into your 2026 tax situation.
For example, you may want to ask:
Is my business more profitable this year?
Are my estimated tax payments still appropriate?
Should I adjust my payroll or owner compensation?
Are there equipment purchases I should consider?
Am I taking advantage of available retirement planning opportunities?
Are my bookkeeping systems giving me the information I need to make good decisions?
Could changes in my business structure affect future taxes?
Tax preparation looks backward. Tax planning looks forward.
That distinction can make a significant difference for a growing business.
Don't Let October 15 Become an Emergency
The good news is that September gives you time.
Instead of waiting until October to begin gathering documents, organizing your books, and answering questions, use the next few weeks to get ahead of the deadline.
A little preparation now can mean fewer surprises, fewer headaches, and a much smoother filing process.
At Barrett Accounting & Tax Services, we understand that business owners have enough responsibilities without adding unnecessary tax stress to the list. Professional tax preparation and planning can help you stay organized, understand your numbers, and make informed decisions about your business.
If you received a tax extension, don't wait until October 15 to start thinking about it. Now is the time to get organized and make sure you're ready.
Tax rules and deadlines can vary depending on your individual circumstances. This article is for general informational purposes and should not be considered individualized tax advice. Consult your tax professional regarding your specific situation.
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