Year-End Tax Planning: 7 Strategies Every Business Owner Should Know

Tax planning is not a December activity. It's a year-round discipline — but the weeks between October and December 31 represent your last real opportunity to implement strategies that reduce your current-year tax burden. Once the calendar flips to January 1, most of the levers are gone. Here are seven strategies every business owner should be reviewing before year-end.

1. Accelerate Deductions, Defer Income

The most fundamental year-end strategy: if you expect to be in the same or higher tax bracket next year, accelerate deductible expenses into the current year and defer income recognition into January where your business model allows. Practically, this might mean prepaying certain recurring expenses (insurance, subscriptions), purchasing equipment you planned to buy anyway, or timing the invoicing of a large project so payment falls in January rather than December. For cash-basis taxpayers, the timing of income and expense recognition is directly within your control.

2. Maximize Retirement Contributions

Retirement contributions are one of the most powerful tax deductions available to business owners. Depending on your plan type:

• SEP-IRA: Up to 25% of net self-employment income, or $69,000 for 2024. Contributions can be made as late as your tax filing deadline, including extensions.
• Solo 401(k): Employee contributions must be elected by December 31, but employer profit-sharing contributions can be made by the filing deadline.
• Defined benefit pension plan: For high earners, these plans can allow contributions well above $200,000 annually — but must be established before year-end.

3. Section 179 and Bonus Depreciation

Section 179 allows businesses to immediately deduct the full cost of qualifying equipment placed in service during the tax year. For 2024, the limit is $1,160,000. Bonus depreciation (currently 60% for 2024) allows an additional first-year deduction on qualified property.

4. Review Your Entity Structure

Year-end is an excellent time to evaluate whether your current business entity is still the most tax-efficient option. The question most commonly arises around S-Corp elections. If you're a profitable sole proprietor or single-member LLC, you may be paying self-employment tax (15.3%) on all business income. An S-Corp election allows you to pay yourself a reasonable salary and take remaining profits as distributions — which are not subject to SE tax. For businesses with net profits above approximately $60,000–$80,000, this structure can generate meaningful annual tax savings.

5. Take Stock of Losses and Credits

If you have capital losses from investments, year-end is the time to harvest them against capital gains. If you have net operating loss carryforwards from prior years, now is the time to confirm how they apply to your current-year liability. And if your business qualifies for tax credits — the R&D credit, the Work Opportunity Tax Credit, energy efficiency credits — year-end planning should include confirming eligibility and documentation requirements.

"Tax credits reduce your liability dollar for dollar — not just the income that's subject to tax. A $50,000 credit is worth more than a $50,000 deduction in any tax bracket."

6. Fund a Health Savings Account (HSA)

If you're covered by a qualifying high-deductible health plan, HSA contributions are fully deductible, grow tax-free, and can be withdrawn tax-free for qualifying medical expenses. For 2024, the limit is $4,150 for individual coverage and $8,300 for family coverage, with a $1,000 catch-up for those 55 and older. HSAs are one of the few truly triple-tax-advantaged accounts available — and maxing yours annually is a straightforward, often-overlooked strategy.

7. Review Estimated Tax Payments

If you've had a strong year, ensure your estimated tax payments are sufficient to avoid underpayment penalties. The safe harbor is generally 100% of last year's tax liability (or 110% if your adjusted gross income exceeded $150,000). If your payments have fallen short due to a better-than-expected year, a Q4 estimated payment made before January 15 can prevent penalties.

The Right Way to Approach Year-End Planning

None of these strategies should be implemented in isolation. The right tax plan depends on your current-year income projection, your expected income next year, your entity structure, your goals, and the specific deductions and credits you qualify for. That's why year-end planning is a conversation — not a checklist. The earlier you have it with your financial advisor, the more options you have.