September has a funny way of sneaking up on practice owners.
One minute you’re setting goals for the year. The next, back-to-school exams are filling the schedule, fall frame lines are arriving, and somehow we’re already talking about Q3 estimated taxes.
For many optometry practice owners, the next federal estimated tax payment is due September 15.
But before you make the payment and move on with your day, there’s a question worth asking:
Does the tax plan you started 2026 with still match the year you’re actually having?
Because a lot can happen inside an optometry practice in eight months.
And sometimes, that’s very good news.
Maybe 2026 Has Been Better Than You Expected
Think back to January.
What did you expect this year to look like?
Now compare that with what’s actually happened.
Maybe your schedule has been consistently full. Your optical is having a great year. You added specialty services that are gaining traction. Your associate is producing more than expected. Or perhaps you simply had a few really strong months.
That’s worth celebrating.
It’s also worth telling your CPA.
An S corporation generally doesn’t pay federal income tax on its operating profit at the corporate level. Instead, that income typically passes through to the shareholders and is reported on their individual tax returns.
In plain English? If your practice makes more money than expected, your personal tax picture may change too.
And here’s the part that’s easy to miss: the amount sitting in your personal bank account isn’t necessarily the number that determines your taxable share of S-corp income.
You could leave cash inside the practice and still have taxable pass-through income.
That’s one reason we don’t want practice owners trying to judge their tax situation by their bank balance alone.
Or Maybe You Spent More Than You Planned
A higher tax bill isn’t the only reason to revisit your projections.
Maybe this was the year you finally replaced that OCT.
Or added an Optos.
Or invested in dry-eye technology.
Maybe you remodeled the optical, hired another staff member, brought on an associate OD, increased your marketing, or opened another location.
Those decisions changed the financial picture of your practice.
Some may have tax implications. Some may primarily affect your cash flow. And some may do both.
That’s where having current books becomes incredibly important.
If you’re trying to make September tax decisions using financials that haven’t been updated since April, you’re essentially trying to drive while looking in the rearview mirror.
Current numbers give your CPA something useful to plan with.
Then There’s the Money You’re Paying Yourself
This is where S-corp taxes can start sounding unnecessarily complicated, so let’s keep it simple.
As an S-corp owner working in your practice, you may receive money in more than one way.
You probably receive a paycheck.
You may also take shareholder distributions.
Those two things aren’t treated exactly the same for tax purposes. And the IRS requires shareholder-employees to receive reasonable compensation for the work they perform before taking non-wage distributions.
But you don’t need to become an S-corp tax expert. That’s our job.
What you should know is whether something has changed.
- Did you increase your salary?
- Have you taken significantly more distributions than you expected?
- Did your practice become much more profitable?
- Did you reduce your clinical schedule?
- Did your role inside the practice change?
Those are exactly the kinds of things your CPA should know about.
“But I’m Already Paying Taxes Through Payroll.”
Good. That’s another piece of the puzzle.
If you’re receiving W-2 wages from your practice, you’re likely already paying some federal and state income tax through payroll withholding.
Then you may also be making quarterly estimated payments.
Your spouse may have taxes withheld from their paycheck.
You could have investment income or income from another business.
It all comes together when determining whether you’re on track. That’s why we don’t recommend looking at your September estimated payment in isolation.
The better question isn’t: “What did I pay last quarter?”
It’s: “Based on everything that’s happened this year, am I still on track?”
That’s a much more useful conversation.
You may hear your CPA talk about something called a safe harbor.
Despite the tax jargon, the concept is pretty straightforward.
The IRS generally expects taxpayers to pay enough tax throughout the year rather than waiting until they file their return. Safe-harbor rules provide thresholds that can help taxpayers avoid an estimated-tax underpayment penalty.
Here’s the important part for a practice owner:
Avoiding a penalty doesn’t necessarily mean you won’t owe money at tax time.
You could satisfy a safe-harbor requirement and still have a balance due with your return if your income increased significantly.
So when Williams Group looks at tax planning, the goal isn’t simply to check the minimum box required to avoid a penalty.
We want you to understand what’s coming.
A $30,000 tax bill feels very different when you’ve been planning for it than when you discover it in April.
Think About What’s Happened Outside the Practice, Too
Your optometry practice may be your biggest source of income, but it isn’t necessarily the only thing affecting your taxes.
Maybe you sold an investment.
Your spouse changed jobs.
You bought or sold real estate.
You started receiving additional income.
You made a large retirement contribution.
You bought another practice.
You sold part of one.
You added a partner.
You had another significant financial change that your CPA doesn’t know about yet.
There’s a simple rule here:
If you’re wondering, “Does my CPA need to know about this?” — the answer is YES!
We would much rather hear about something early and determine that it doesn’t materially affect your plan than learn about it after the year has ended.
So, Should You Change Your September Payment?
Maybe.
Maybe not.
And that’s actually the point.
Don’t increase it just because you had a good summer. Don’t decrease it just because you bought a piece of equipment. And don’t automatically send the exact same amount you paid in June simply because that’s what’s printed on a voucher.
Your estimated payment is part of a larger tax plan. If your year is tracking pretty closely with the assumptions used to build that plan, there may be nothing to change.
But if you read this article and thought:
Actually, our revenue is quite a bit higher.
We did buy a lot of equipment this year.
I’ve taken more distributions than I expected.
We hired another OD.
My spouse’s income changed.
I haven’t talked to my CPA about any of this.
That’s your cue. Not to panic.
To have a conversation.
September Gives You Something April Doesn’t: Time
That’s what we like about this point in the year.
There’s enough of 2026 behind you to have real numbers instead of projections.
And there’s enough of 2026 ahead of you to still make thoughtful decisions.
Maybe everything is exactly on track. Great.
Maybe your estimates need to change.
Maybe there’s a planning opportunity you haven’t considered yet.
Or maybe you simply need someone to look at the bigger picture and tell you where you stand.
That’s what proactive tax planning is supposed to feel like.
Not scrambling in April. Not being surprised by a number after the year is already over. And definitely not trying to become a tax expert yourself.
Your job is to run your practice. Our job is to help you understand what the financial decisions you’re making today could mean at tax time.
If your practice, or your life, looks different today than it did when your 2026 tax estimates were calculated, now is a good time to talk.
402.488.2020



