Key Takeaways
- Start with a tax projection. Understand your expected taxable income before pursuing deductions.
- Know your deadlines. Some payroll and equipment decisions require action before December 31, while certain retirement contributions and tax elections can happen later.
- Review OBBBA changes. Bonus depreciation and research expensing may create opportunities for qualifying businesses.
- Protect your cash. A smaller tax bill doesn’t automatically mean a better financial decision.
Some tax-saving opportunities disappear when the calendar turns. Others become expensive mistakes when decisions are rushed.
Year-end tax planning for 2026 isn’t just about finding deductions. It’s about making smart financial decisions before December 31 without putting your company’s cash flow at risk.
One of the most common questions business owners ask their CPA in December is, “What can I buy to lower my taxes?”
But by then, some valuable opportunities have already narrowed. Payroll decisions need to be finalized, retirement contributions require planning, and purchasing unnecessary equipment may cost more than the tax savings are worth.
For established companies, particularly in manufacturing, biotech, and life sciences, the goal should be to reduce avoidable taxes while keeping the business financially strong for 2027.
That’s why proactive tax planning should begin before December, when business owners still have time to evaluate their options.
Here are seven decisions worth making before year-end.
1. Know Your 2026 Tax Liability Before Looking for Deductions
One of the biggest mistakes in year-end tax planning is looking for deductions before understanding your company’s actual tax position. Without a reliable projection of taxable income, every strategy becomes an educated guess.
Use financial statements through October or the latest completed month, then account for expected revenue, expenses, depreciation, and other tax adjustments through December 31.
This helps determine whether additional deductions are necessary and how much cash should be reserved for tax payments.
It also helps identify potential estimated tax underpayments. Understanding what happens when you miss a quarterly estimated tax payment can prevent unnecessary penalties and last-minute surprises.
For owners of pass-through businesses, the projection should also consider how business income affects their personal tax situation.
The decision: Know your projected tax liability before deciding how much to spend or contribute.
2. Review Owner Compensation and Bonuses
For S corporation owners, reasonable compensation is an important year-end tax planning consideration.
The IRS generally requires shareholder-employees to receive reasonable wages for their services before taking non-wage distributions.
Waiting until tax season to review compensation can create payroll complications and missed planning opportunities.
Year-end is also a good time to evaluate bonuses, particularly when the business has performed well. However, compensation decisions should consider available cash, payroll taxes, and other business commitments.
The decision: Review owner salaries and planned bonuses before the final 2026 payroll.
3. Decide Which Retirement Contributions Need Action
Retirement contributions are an important part of year-end tax planning, especially for business owners who want to reduce taxable income while preparing for retirement. However, not every contribution follows the same deadline.
Employee 401(k) salary deferrals generally require timely elections tied to eligible compensation. For 2026, the basic employee contribution limit is $24,500, with additional catch-up contributions available to eligible individuals.
Certain employer contributions, including profit-sharing and SEP contributions, may be funded after December 31 under applicable deadlines.
For S corporation owners, retirement contributions generally depend on eligible W-2 compensation rather than shareholder distributions.
The decision: Identify which retirement elections must happen during 2026 and which contributions can be completed later.
4. Evaluate Equipment Purchases Before December 31
Equipment purchases can generate significant deductions, particularly for manufacturers and life sciences companies.
The One Big Beautiful Bill Act (OBBBA) restored permanent 100% bonus depreciation for certain qualifying property acquired after January 19, 2025.
For 2026, the Section 179 deduction limit is $2,560,000, with the phaseout beginning when qualifying property placed in service exceeds $4,090,000.
However, equipment generally must be placed in service before December 31 to qualify for a 2026 depreciation deduction. Simply ordering or paying for equipment isn’t necessarily enough.
More importantly, a deduction doesn’t make an unnecessary purchase worthwhile.
This is where year-end tax planning should go beyond calculating deductions and consider whether a purchase makes financial sense for the business.
Consider a $200,000 equipment purchase that produces a full deduction. Assuming a 30% marginal tax benefit, the potential tax savings would be approximately $60,000.
The business still spent $200,000.
This matters because profitable companies can still run out of cash when major purchases and operating commitments consume their available resources.
The decision: Purchase equipment because it benefits the business, then evaluate whether the timing provides a tax advantage.
5. Review Entity-Level Elections and Multi-State Taxes
Companies operating in multiple states may face tax obligations even without physical offices in those states.
Shipping products, employing remote workers, or performing services across state lines can create sales tax or income tax responsibilities.
Before year-end, review sales by state and determine whether additional registrations or filings may be required.
Eligible S corporations and partnerships should also evaluate pass-through entity tax elections.
These elections may provide tax benefits, but requirements and deadlines vary by state. Some elections can be made when filing the tax return, even though planning should begin earlier.
The OBBBA also made the Section 199A qualified business income deduction permanent, providing greater certainty for certain eligible pass-through business owners.
The decision: Review multi-state exposure and determine whether available entity-level elections make financial sense.
6. Confirm R&D Documentation Before Filing Season
For manufacturing, biotech, and life sciences companies, year-end tax planning should include reviewing research and development activities. These businesses may qualify for valuable tax deductions and credits, but eligibility depends on maintaining proper documentation.
But eligibility requires proper documentation.
Businesses should maintain records showing which employees worked on research projects, the technical challenges addressed, and the related expenses.
Trying to reconstruct this information months later can make substantiating a claim more difficult.
Under the OBBBA, Section 174A generally allows current deductions for eligible domestic research expenditures incurred in tax years beginning after December 31, 2024. Foreign research expenditures generally remain subject to 15-year amortization.
Research deductions and R&D tax credits have separate requirements, making accurate expense classification essential.
The decision: Ensure research projects, employee time, and qualifying expenses are documented before year-end.
7. Evaluate Income and Expense Timing
Another important part of year-end tax planning is deciding when income and expenses should be recognized. Depending on the company’s accounting method and projected profitability, timing can affect taxable income in both 2026 and 2027.
Cash-method businesses generally recognize income when received and many expenses when paid. Accrual-method businesses follow different recognition requirements.
Before accelerating expenses or deferring income, compare the potential tax effects across both 2026 and 2027.
A deduction taken this year may not always provide the greatest benefit, especially if taxable income is expected to increase next year.
Cash flow should also guide the decision.
For calendar-year C corporations, the fourth federal estimated tax payment is generally due December 15, 2026. For individuals with pass-through income, the fourth 2026 estimated payment is generally due January 15, 2027.
The decision: Evaluate the timing of income, expenses, and tax payments without compromising cash needed for 2027 operations.
Don’t Let December Make Your Decisions for You
Effective year-end tax planning begins before December. Reviewing projections in September or October gives business owners more time to evaluate opportunities, while November and December should focus on finalizing and carrying out decisions.
It’s spending cash your business needed just to make the tax bill smaller.
A good tax strategy begins with accurate financial information, projected taxable income, and a clear understanding of the company’s cash requirements.
For manufacturing, biotech, and life sciences businesses, that means balancing tax savings with equipment investments, research spending, payroll, and future growth.
As December 31 approaches, don’t just ask:
“How much can we deduct?”
Ask:
“Which decisions will leave our business financially stronger in 2027?”
That’s the difference between reacting to a tax bill and planning for a stronger year ahead.
