Year-End Tax Planning Checklist for Small Business Owners

Most business owners treat tax planning as something that happens in April. That's backwards. By the time you're preparing your return, the year is already locked in — all you can do is report what happened.

Real tax savings come from decisions made in the last quarter of the year. Here's the year-end checklist every small business owner should run through before the ball drops.

1. Project Your Year-End Income

Before you can plan, you need to know where you stand. Work with your bookkeeper or CPA to project:

• Total expected revenue for the year
• Total expected expenses
• Projected net profit
• Estimated federal and state tax liability

This one exercise tells you whether you should accelerate deductions, defer income, fund retirement, or do nothing.

2. Accelerate Expenses (If Beneficial)

If you'll owe significant tax this year, prepaying legitimate business expenses can reduce your bill:

• Renew software subscriptions a year in advance
• Pay January rent or insurance premiums in December
• Stock up on supplies or inventory
• Prepay professional services (accounting, legal)

Cash-basis taxpayers deduct expenses when paid, not when due — so December prepayments reduce this year's taxes.

3. Defer Income (When It Makes Sense)

If you expect lower income next year, delay invoicing until January. Even waiting a few days pushes that revenue into the next tax year.

But be careful: if next year's income will be higher, deferring actually increases your lifetime tax. This is where projections matter.

4. Maximize Retirement Contributions

This is the single biggest tax-saving move for most self-employed people:

• Solo 401(k): Contribute up to $69,000 in 2024 ($76,500 if 50+)
• SEP-IRA: Up to 25% of net self-employment income
• Traditional IRA: Up to $7,000 ($8,000 if 50+)
• HSA (if eligible): $4,150 individual / $8,300 family

Most retirement accounts must be established by December 31, even if contributions can be made up until the tax deadline. Set up the account now.

5. Make Large Equipment Purchases

Section 179 and bonus depreciation let you fully deduct qualifying equipment purchases in the year they're placed in service. If you've been planning to buy:

• Computers, laptops, and monitors
• Office furniture
• Vehicles used for business
• Software and technology

Doing it before December 31 (and actually using it) lets you deduct the full cost this year instead of depreciating over several years.

6. Review and Make Charitable Contributions

If you itemize, December is prime time for charitable giving. Options include:

• Cash donations to qualified charities
• Donating appreciated stock (avoid capital gains tax)
• Donor-advised fund contributions (deduct now, grant later)

7. Harvest Tax Losses

If you have investments that have lost value, selling them before year-end generates capital losses that offset capital gains — or up to $3,000 of ordinary income. Just watch the wash-sale rule (don't rebuy the same security within 30 days).

8. Set Up an S-Corp Election (for Next Year)

If your business is generating consistent profit above $40,000–$50,000, now is the time to evaluate whether to elect S-Corp status for the new year. The election must generally be filed by March 15 to be effective for the current year — but planning should start in Q4.

9. Review Payroll and Bonuses

If you're an S-Corp owner, year-end is when you confirm your reasonable salary, process year-end bonuses, and make sure all required payroll has flowed through before December 31. W-2 deadlines are tight in January.

10. Gather & Organize Documentation

Use December downtime to prepare for tax season:

• Reconcile all bank and credit card accounts
• Match receipts to expenses
• Update mileage logs
• Gather 1099-NEC forms for contractors you paid $600+
• Organize W-2s, 1099s, and investment statements as they arrive

11. Make Final Quarterly Estimated Payment

Don't forget: the Q4 estimated tax deadline is January 15. Make sure you've hit your safe harbor (100% of last year's tax, 110% if AGI > $150K) to avoid underpayment penalties.

The Bottom Line

Tax planning isn't something you do at tax time — it's something you do before tax time. The best savings are locked in during the last 60 days of the year.

If you've been treating taxes as an afterthought, switching to year-end planning mode is one of the single most profitable things you can do as a business owner. The work takes a few hours. The savings compound for years.