If you’re a small business owner, the end of the year is the perfect time to take control of your taxes. Don’t leave money on the table. 2025 brings some big opportunities, like the One, Big, Beautiful Bill Act (OBBBA), which restores 100% bonus depreciation and expands Section 179 expensing. At the same time, several major provisions from the 2017 Tax Cuts and Jobs Act (TCJA) are set to expire after 2025. That makes this year especially important to plan ahead.
A little planning now can lower your 2025 tax bill and set your business up for a stronger 2026.
Review Your Profit & Loss Statement Now
The first step in year-end planning is knowing where you stand. Go through your profit and loss statement to see revenue, deductible expenses, and opportunities to defer income or accelerate deductions.
This is also a good time to hit safe harbor targets for estimated taxes. Generally, that means paying 90% of your current-year tax or 100% of last year’s tax, or 110% if you’re a high-income filer. Doing this helps you avoid penalties.(1)
If your income fluctuates, use the annualized income installment method on Form 2210, Schedule AI, to get a more accurate estimate for Q4. Also, take a hard look at cash flow. Late payments and uneven revenue streams can derail your year-end tax moves if you’re not careful.(2)
Maximize Year-End Deductions
Timing matters. If cash flow allows, consider deferring client invoices into January to push income into 2026. Prepaying deductible expenses like rent, insurance, or vendor contracts can pull those deductions into 2025.
Bonus Depreciation and Section 179
2025 is generous for small businesses:
- 100% bonus depreciation means you can fully deduct qualifying equipment, software, and some vehicles placed in service by December 31, 2025.
- Section 179 spending allows up to $2.5 million in immediate deductions, phasing out at $4 million. This is perfect for smaller businesses making moderate investments in equipment or tech.
Often Overlooked Moves
- Cost segregation for property: Office improvements like HVAC or roofing can sometimes be reclassified to shorter depreciation schedules, making them eligible for bonus depreciation.
- Placed-in-service rule: Buying an asset isn’t enough. It needs to be ready and available for use in 2025. Ordering in December but installing in January moves the deduction to next year.
Bottom line: if you’re planning a big purchase, getting it completed before year-end can give you an easy tax win.
Retirement Plan Comparison for Small Business Owners (2025)
| Feature | Solo 401(k) | SEP IRA | CalSavers (CA only) |
| Contribution Limit (2025) | Up to $70,000 (employee deferrals + employer profit-sharing) | Up to 25% of compensation, capped at $70,000 | Employee contribution limit: $7,000 (under 50), $8,000 (50+) |
| Catch-Up Contributions | $7,500 (age 50+), $11,250 if age 60–63 | Not available | $1,000 catch-up (50+) |
| Setup Deadline | Must be established by Dec 31, 2025 | Can be set up and funded up to the tax filing deadline (incl. extensions) | Employers must register or set up their own plan by Dec 31, 2025 |
| Flexibility | High — allows both employee and employer contributions | Moderate — employer-only contributions | Low — employee-funded, auto-enrolled |
| Tax Benefits | Reduces taxable income, powerful for high earners | Deductible contributions, easy admin for small biz | Tax-deferred savings for employees, state-mandated |
| Startup Tax Credit | Up to $5,000/year for first 3 years (plus $500 for auto-enrollment) | Same as Solo 401(k) if new plan | Not eligible |
| Who It’s Best For | Solo entrepreneurs or small biz with no/full-time employees | Businesses with variable profits or a few employees | CA businesses with 1–4 employees that don’t offer retirement plans |
Finalize Payroll and Bonuses
If you’re giving out holiday or performance bonuses, make sure the checks go out before December 31. That’s the only way they count as a 2025 deduction.
It’s also a good time to double-check your payroll records against what’s reported to the IRS on Form 941 and W-2s. Catching mistakes now saves you messy corrections or penalties later.
Tip: if you use payroll software or a provider, ask for a year-end report. It’s an easy way to spot discrepancies before the numbers are locked in.
Donate to Charities
Year-end giving can reduce your taxes and support causes you care about, but timing and documentation are key.
- Cash gifts: Deductible if made before December 31 with a bank record or written communication.
- Appreciated stock held >1 year: Deduction equals fair market value, and you avoid capital gains.
- Noncash donations: Over $500 requires Form 8283. Gifts over $5,000 generally need a qualified appraisal. C corporations may be able to deduct inventory at cost plus half of the appreciation.(3)
Smart tips:
- Make sure the charity actually receives donations before December 31. Even electronic transfers need correct timestamps.
- Consider bunching contributions using a donor-advised fund to maximize deductions if you don’t itemize every year.
- Keep written receipts, appraisals, and the charity’s EIN. Proper documentation ensures your deduction stands up if the IRS asks.
Talk to a Tax Professional Before January
Tax rules aren’t just complicated — they change every year. A quick session with your CPA or tax advisor before December 31 can uncover deductions you didn’t know about, help you time expenses correctly, and ensure you’re compliant with new rules like Beneficial Ownership Information reporting or digital asset updates.
Even a short planning session can save you thousands — sometimes much more than the cost of the consultation.
Conclusion
Smart year-end tax planning isn’t about paperwork; it’s about making the right moves before December 31. With 2025 changes already in motion and the TCJA sunset approaching, now is the time to be proactive.
At America Tax Group, we work side by side with small business owners to uncover deductions, avoid surprises, and build long-term strategies. Planning now can mean big savings later, and your 2026 self will thank you.
📞 Ready to get ahead of tax season? Contact us today to schedule your 2025 year-end tax planning consultation.
FAQs: Year-End Tax Planning for Small Businesses (2025)
Q1. When should I start year-end tax planning?
Ideally, you should start reviewing your finances by early December, if not sooner. That gives you time to accelerate deductions, defer income, and finalize retirement contributions or charitable donations before the December 31 cutoff.
Q2. Can I still take advantage of 100% bonus depreciation or Section 179?
Yes. For 2025, bonus depreciation is fully back and Section 179 allows up to $2.5 million in immediate deductions. The key is placing the asset in service before December 31, 2025. Just ordering it isn’t enough—it needs to be ready to use.
Q3. What retirement plans should I consider for my small business?
It depends on your setup:
- Solo 401(k) is great if you’re a solo entrepreneur or have no full-time employees.
- SEP IRA works well for businesses with variable profits or a few employees.
- CalSavers is mandatory in California if you have 1–4 employees and no plan.
Q4. How do I maximize charitable deductions at year-end?
Cash donations must be received by December 31. For appreciated stock, the asset must transfer to the charity before year-end. Noncash donations over $500 need Form 8283, and donations over $5,000 usually require an appraisal. Always get receipts and the charity’s EIN.
Q5. Can I defer income to next year to lower my 2025 taxes?
Yes, if your cash flow allows. For example, holding off on invoicing until January 2026 pushes taxable income into the new year. Just make sure it makes sense for your business and doesn’t trigger other tax complications.