Business owners face a tax planning landscape that looks fundamentally different from a salaried employee’s. Income is variable. Deductions are significant. And the decisions made before December 31 about compensation structure, retirement contributions, and business expenses can have a meaningful impact on what is owed at filing.
The challenge is that most of these decisions require action well before year-end. By November, some options are already closing. By December, most of the useful moves are off the table entirely. The business owners who manage their tax exposure most effectively are the ones who review their situation in Q3, before the year is too close to change.
This guide covers the core year-end tax decisions most business owners should be reviewing now, organized around the questions that drive each one.
The year-end tax decisions that matter most for business owners
Have you reviewed your business structure for tax efficiency this year?
Business structure has a direct impact on how income is taxed. An S corporation, for example, allows owners to split income between salary and distributions, which can reduce self-employment tax exposure when set up correctly. A sole proprietor or single-member LLC taxed as a disregarded entity pays self-employment taxes on all net profit.
This is not a decision to make casually or in December. Changes to business structure require legal and tax coordination and typically take effect at the start of a new year. But if your structure no longer reflects how your business operates, reviewing it before year-end positions you to make changes that take effect at the right time.
| Business structure | Key tax consideration |
| Sole proprietor / single-member LLC | All net profit subject to self-employment tax |
| S corporation | Reasonable salary required; distributions may reduce SE tax exposure |
| Partnership / multi-member LLC | Pass-through income; self-employment tax applies to active partners |
| C corporation | Separate entity tax; qualified dividends taxed at individual level |
Is your owner compensation structured appropriately?
For S corporation owners, the IRS requires that shareholders who perform services for the corporation receive reasonable compensation before taking distributions. Setting compensation too low in order to reduce payroll taxes is a documented audit risk. Setting it appropriately, on the other hand, allows the remaining profit to be distributed in a way that is tax-efficient and defensible.
The right compensation amount depends on what the role would pay in the market, the profitability of the business, and how distributions are structured. If compensation has not been reviewed recently, Q3 is a reasonable time to assess whether the current setup reflects both the business reality and the compliance standard.
Have you maximized retirement contributions available through your business?
Business ownership creates access to retirement contribution vehicles that are not available to W-2 employees, and the contribution limits for these accounts are substantially higher.
Common retirement plan options for business owners:
- SEP-IRA: contribution limit is up to 25 percent of compensation, with a 2026 cap of $69,000. Contributions can be made up to the business tax filing deadline, including extensions
- Solo 401(k): available to self-employed individuals with no full-time employees other than a spouse. Allows both employee and employer contributions, with a combined 2026 limit of $69,000 plus catch-up contributions for those 50 and over
- SIMPLE IRA: available to businesses with 100 or fewer employees. Lower contribution limits but simpler administration
- Defined benefit plan: allows significantly higher contributions for higher-income owners, particularly those in their 50s who want to accelerate retirement savings
The choice of plan depends on income level, business structure, number of employees, and planning goals. What matters now is confirming that contributions are on track and that the plan type in use still fits the business.
Are there deductions you have not fully reviewed for the year?
Business owners have access to a range of deductions that require either documentation or action before December 31. Reviewing these in Q3 rather than at filing ensures that qualifying expenses are captured and that any actions required to support a deduction are completed in time.
Deduction categories worth reviewing before year-end:
- Home office deduction: requires regular and exclusive use of a dedicated space for business
- Vehicle use: requires mileage logs or actual expense records maintained throughout the year
- Business equipment and technology: Section 179 expensing and bonus depreciation allow immediate deduction of qualifying asset purchases in the year placed in service
- Health insurance premiums: self-employed owners can often deduct premiums for themselves and their families
- Professional development, subscriptions, and business-related travel: documentation and business purpose are required
The most common issue with business deductions is not that owners lack qualifying expenses. It is that the documentation required to support them is incomplete. Reviewing records before year-end gives time to address gaps.
Have you reviewed estimated tax payments for the year?
Business owners who do not have taxes withheld through payroll are generally required to make quarterly estimated tax payments. Underpayment penalties apply when payments fall short of a safe harbor threshold based on prior-year liability or current-year projected liability.
If income has increased significantly this year, or if business results in Q3 are coming in higher than expected, reviewing the Q3 estimated payment and adjusting Q4 accordingly can avoid an unexpected balance and penalty at filing.
Estimated tax payment schedule for 2026:
- Q1 payment: April 15, 2026
- Q2 payment: June 16, 2026
- Q3 payment: September 15, 2026
- Q4 payment: January 15, 2027
Are there income timing decisions that still make sense before year-end?
Some business owners have flexibility in when income is recognized. This is particularly relevant for cash-basis businesses, where income is generally recognized when received rather than when earned. If year-end income recognition can be deferred into the following year without disrupting operations or client relationships, that timing choice can shift income into a lower-rate environment.
The reverse is also sometimes true. If you expect income to increase significantly next year, accelerating some income into the current year may produce a lower overall tax rate across both years. This is a decision that requires a projection of both years’ income to evaluate properly.
Income timing decisions need to be made before the transactions occur, not after. That makes Q3 review particularly important for business owners who have the ability to influence when income is received.
Year-end tax checklist for business owners: quick reference
| Decision area | Action to review now |
| Business structure | Does current structure still reflect how the business operates and who works in it? |
| Owner compensation | Is salary reasonable and defensible for S corp owners? Has it been reviewed this year? |
| Retirement contributions | Are contributions maximized in the right plan type for the business? |
| Deductions | Are qualifying expenses documented? Are any asset purchases worth timing before year-end? |
| Estimated taxes | Are Q3 and Q4 payments on track given actual year-to-date income? |
| Income timing | Is there flexibility to defer or accelerate income based on projected rates across years? |
The coordination piece most business owners miss
Each of the decisions above affects the others. Owner compensation affects retirement contribution limits. Retirement contributions affect taxable income. Taxable income affects estimated tax calculations. And all of it feeds into the overall tax picture for the year.
This is why reviewing these items in isolation, or leaving them to the tax preparer in April, often produces a less efficient outcome than reviewing them together in Q3. A CPA or tax advisor may see the return in April, but the decisions that shape it need to be made months earlier.
If your business tax planning and broader financial planning are being handled by different people with limited coordination between them, that gap is often where the most meaningful optimization opportunities exist.
How Goldstein Financial supports business owner tax planning
At Goldstein Financial, we work with business owners to review their year-end tax picture before the window closes. That includes reviewing compensation structure, retirement contribution strategy, and how business decisions connect to personal financial planning goals.
If you want to walk through where your business stands before Q4, we are glad to help. The right time to have that conversation is before the decisions have to be made, not after.
Contact Goldstein Financial to schedule a review.
Learn more about our financial planning approach.