2026 Year-End Tax Planning Checklist for Small Business Owners
Tax planning that happens in April is really just tax filing. The moves that actually change what you owe happen now, in the last few months of the year, while there is still time to act. Here’s a practical year-end tax planning checklist for small business owners, built around what’s changed for 2026.
Start With a Real Profit Estimate
Every move on this list depends on knowing roughly where your business will land for the year. Before you decide whether to buy equipment, fund a retirement account, or accelerate an expense, get your books reconciled through at least October and build a realistic projection for the full year.
Guessing at this stage can lead to overpaying for deductions you did not need or missing opportunities that could have reduced your tax bill.
Time Equipment Purchases Carefully
The One Big Beautiful Bill Act made major changes to equipment deductions, and they remain in effect for 2026. The Section 179 deduction limit for 2026 is $2,560,000. The deduction begins phasing out dollar for dollar once total qualifying equipment purchases for the year exceed $4,090,000.
In addition, qualifying property acquired and placed in service after January 19, 2025 may qualify for 100% federal bonus depreciation.
Put simply, if you’re already planning to buy equipment, vehicles, machinery, computers, or other qualifying business property, placing those assets in service before December 31 may allow you to deduct a significant portion, or potentially all, of the qualifying cost on your 2026 federal return.
The key phrase is placed in service. Simply ordering or paying for equipment before December 31 may not be enough if the asset is not ready and available for business use until 2027.
There is also an important Pennsylvania difference. Pennsylvania personal income tax does not follow the federal bonus depreciation rules. That means you may receive a large federal deduction while calculating Pennsylvania depreciation differently. The federal deduction can still be valuable, but the state treatment should be part of your planning rather than a surprise at tax time.
Max Out Retirement Contributions
Retirement plan limits increased again for 2026. Depending on the type of plan, contributions made before year-end or before your tax filing deadline can reduce taxable income while helping you build long-term retirement savings.
- SEP IRA: Employer contributions can generally equal up to 25% of compensation, subject to a maximum contribution of $72,000 for 2026. Self-employed individuals calculate their contribution using special rules based on net earnings from self-employment. SEP contributions can often be made as late as the business’s tax filing deadline, including extensions.
- SIMPLE IRA: The standard employee contribution limit is $17,000 for 2026. Certain eligible SIMPLE plans may allow a higher $18,100 contribution limit. The general catch-up contribution for participants age 50 or older is $4,000, with separate higher limits potentially applying to participants ages 60 through 63.
- Solo 401(k): The employee elective deferral limit is $24,500 for 2026, plus applicable catch-up contributions. A business owner may also be able to make an employer contribution, making a Solo 401(k) one of the more powerful retirement savings options available to self-employed individuals with no employees other than a spouse.
Which plan makes the most sense depends on whether you have employees, how consistent your income is, how much you want to contribute, and how your business is structured. This is an area where a planning conversation can make a significant difference.
Check Where You Stand on Estimated Payments
If you make quarterly estimated tax payments, the fourth-quarter federal payment for individuals and many pass-through business owners is generally due January 15, 2027. Calendar-year C corporations generally have an earlier fourth-quarter estimated payment deadline.
The federal safe harbor rules are worth reviewing before year-end. In general, individuals can avoid an estimated tax underpayment penalty by paying the smaller of:
- At least 90% of the tax ultimately owed for 2026, or
- 100% of the tax shown on the 2025 return.
If your 2025 adjusted gross income exceeded $150,000, or $75,000 if married filing separately, the prior-year threshold generally increases from 100% to 110%.
If your income increased substantially during 2026 because of a strong year in the business, a large capital gain, or another one-time event, review your year-to-date withholding and estimated payments before the year closes.
Clean Up Your Books Before You Close the Year
A few bookkeeping habits now can save significant time and money during tax season:
- Reconcile every bank and credit card account through at least October and plan to catch up November and December quickly after year-end.
- Review accounts receivable and determine whether any genuinely uncollectible balances may qualify for bad debt treatment based on your accounting method and circumstances.
- Take a physical inventory count if inventory is part of your business because your year-end inventory value can directly affect cost of goods sold.
- Review vendor and contractor information now so you have the correct names, addresses, and taxpayer identification information needed for January 1099 filings.
- Review payroll records before year-end so W-2 information does not become a January cleanup project.
Revisit Compensation and Entity Decisions
If you operate an S corporation, year-end is a good time to review your reasonable compensation as an owner-employee. The IRS expects shareholder-employees who perform services for the company to receive reasonable compensation before taking non-wage distributions.
If you’ve taken substantial distributions while running a relatively small salary through payroll, review the numbers before December payroll closes.
Year-end is also a good time to discuss bonuses for owners and employees. When a bonus is paid and when the business can deduct it may depend on your accounting method, business structure, and the relationship between the company and the recipient.
Consider Charitable and Family Giving
If charitable giving is part of your financial plan, most contributions intended for the 2026 tax year need to be completed by December 31.
Depending on your situation, donating appreciated securities or qualifying property instead of cash may provide additional tax advantages. Business owners who are also working through estate or succession planning may want to review family gifting strategies before year-end as well.
Frequently Asked Questions
When should I start year-end tax planning?
Ideally, start in October or November while there is still enough time to act on what you find. Waiting until the final days of December can limit your ability to make equipment purchases, adjust payroll, fund certain retirement accounts, or take other meaningful steps.
How much can I contribute to a SEP IRA for 2026?
SEP IRA employer contributions can generally equal up to 25% of eligible compensation, subject to a maximum contribution of $72,000 for 2026. Self-employed individuals use a special calculation based on net earnings from self-employment.
Should I buy equipment before the end of the year for the tax deduction?
If your business genuinely needs the equipment and you can place it in service by December 31, purchasing it before year-end may allow you to take advantage of Section 179 or bonus depreciation.
Buying something solely to create a deduction usually does not make financial sense. Spending $1 only to save a fraction of that amount in taxes still leaves your business with less cash.
What is the Section 179 deduction limit for 2026?
The maximum Section 179 deduction for 2026 is $2,560,000. The deduction begins phasing out dollar for dollar once total qualifying Section 179 property placed in service during the year exceeds $4,090,000.
Do I need to make an estimated tax payment before the end of the year?
It depends on your business structure, income, withholding, prior-year tax liability, and payments already made. For individuals and many pass-through business owners, the fourth-quarter federal estimated payment is generally due January 15, 2027.
Even though the payment itself falls in January, reviewing your numbers before December 31 gives you time to identify a potential shortfall and decide how to address it.
Why Year-End Tax Planning Matters
Many of the decisions that can reduce your tax liability must happen before your tax return is due. By April, some of the most valuable planning opportunities have already expired.
Schedule a call with Cohick & Associates or call (717) 249-5321 before year-end. We’ll review your numbers, identify planning opportunities, and help you make informed decisions while there is still time to act.
