Year End Tax Planning Guide for Business Owners: Start Here

December 31 is closer than it feels. The good news? You still have time to make smart tax moves before it gets here, and it does not have to be complicated. We say this every year, and we mean it every year: the earlier you start, the more options you have. Waiting until your CPA calls you in December means a lot of good strategies are already off the table.

We work with business owners across Missouri all year long, and the ones who feel best walking into tax season are almost always the ones who started this conversation early. So, consider this your friendly nudge, from us to you. Here is exactly where to start.

Why Year End Tax Planning Matters

Here is the difference that matters most. Tax filing happens after the year is already over, so you are just reporting what already happened. Tax planning happens before the year ends, while you still have the power to change the outcome. That is the whole game.

A little planning now can mean real savings later, and it can mean walking into tax season with confidence instead of dread. We would much rather see you feeling good about your numbers than scrambling in April.

Review Your Income and Expenses So Far

Before you can plan anything, you need a clear picture of where your business stands. Pull together your year-to-date profit and loss and see whether you are tracking ahead of last year, behind, or about the same.

This snapshot is the foundation for everything else on this list. It helps you and your advisor decide whether it makes sense to accelerate expenses, defer income, or just hold steady.

Time Your Income and Expenses Strategically

If you are having a strong year, it may make sense to accelerate deductible expenses before December 31. If income has been slower, you might look at deferring some revenue into next year instead. A few common ways to do that:

• Prepay certain recurring expenses before year end
• Purchase needed equipment or supplies now instead of January
• Time invoicing so income lands in the year that benefits you most

There is no one size fits all answer here, and that is okay. It depends on your business, your cash flow, and what next year is expected to look like. This is exactly the kind of thing we love talking through with clients.

Check In on Retirement Contributions

Retirement plans are one of the most powerful, and most overlooked, tax planning tools business owners have. Whether you have a SEP IRA, a Solo 401k, or a plan for your employees, year-end is the right time to check your contribution levels.

Maxing out, or even just increasing, your contributions can lower your taxable income while building your own financial future. That is a win we love celebrating with clients.

Revisit Your Business Structure

Are you still set up the right way? A business that started as a sole proprietorship or a single member LLC may benefit from an S Corp election as it grows. This is not a decision to rush into on your own, but year-end is a great time to ask the question with your advisor.

If you are already an S Corp, the year-end version of this question looks a little different: is your reasonable compensation still reasonable? As your business has grown or changed, your W-2 salary versus distributions split may need a second look. It is one of those things that is easy to set once and forget, and worth revisiting before the year closes.

Confirm Your Estimated Tax Payments

If you make quarterly estimated payments, take a moment to confirm you are on track. Underpaying can mean penalties, and overpaying just means you have handed the IRS an interest free loan. Neither is a great look, so this is worth a quick check.

Consider a Missouri Pass-Through Entity Tax Election

If your business is structured as an S Corp or partnership, Missouri's pass-through entity tax election is worth a conversation before year end. In plain terms, it lets your business pay a portion of state tax at the entity level instead of that tax simply flowing through to your personal return, which can help restore a deduction that gets limited when you pay it as an individual.

If your business is on a cash basis, timing matters here too. Paying your estimated pass-through entity tax before December 31 can let you capture that deduction in this tax year rather than next, which is another lever for shifting income if that fits your overall plan. It's exactly the kind of timing question worth putting in front of your advisor before the year closes.

Take Advantage of Available Deductions and Credits

Depreciation rules, Section 179 expensing, and various tax credits change from year to year. What applied last year may not apply the same way this year, and that is exactly the kind of detail we track so you do not have to.

A couple of things worth mentioning: the One Big Beautiful Bill Act is still rolling out, with more changes taking effect in 2027, so it is worth checking in even if you feel settled on last year's rules. And if your business spends money developing new products, processes, or software, ask us whether those research and development costs are being handled the best way on your return. The rules here have shifted, and it is worth a second look.

Get on Your CPA's Calendar Now

Here is the honest truth: the earlier you talk to your advisor, the more options you have. Waiting until January means many of these strategies are already off the table. Waiting until now? You are right on time, and we are excited to help.

Let's Make a Plan Together

Year-end tax planning is not about complicated maneuvers. It is about taking a handful of smart, well-timed steps while you still can. Review where you stand, time your income and expenses wisely, check your retirement contributions, and get on your CPA's calendar before the year runs out on you.

We are here to help you make the most of the time you have left this year. Reach out to your Whitlock advisor today, and let's build your plan together!