Year-End Tax Planning: 7 Things Business Owners Should Review Before December 31

Year-end tax planning works best in the weeks before December 31, while there is still time to influence the outcome. For business owners, that means reviewing the books, projecting the tax position, confirming how owners are paid and checking that the business structure still fits, before the year closes and the options narrow.

There are two very different ways to reach December 31. One is to let the year end and find out what happened when the tax return is prepared. The other is to use the remaining weeks to review where the business stands, identify potential issues and make decisions while there is still time to affect the outcome.

That does not mean manufacturing deductions or making unnecessary purchases simply to save taxes. It means being intentional.

Before the calendar turns to 2027, here are seven areas every business owner should review, along with the 2026 changes that make this year’s review different.

Your Year-End Checklist at a Glance

What Is Different for 2026

The One Big Beautiful Bill Act, signed in July 2025, changed several rules that matter for this year’s planning. 2026 is the first full year in which many of these provisions apply:

• Bonus depreciation is permanently restored at 100% for qualifying property, new or used, acquired after January 19, 2025.
• Section 179 expensing allows up to $2,560,000 for 2026, with the limit phasing out once qualifying property placed in service exceeds $4,090,000.
• The qualified business income (QBI) deduction of 20% for pass-through owners is now permanent.
• Form 1099-NEC and 1099-MISC reporting generally applies to payments of $2,000 or more made in 2026, up from $600.
• Retirement contribution limits for 2026 are $24,500 for 401(k) deferrals, plus an $8,000 catch-up at age 50 or older and an $11,250 catch-up for ages 60 to 63. The IRA limit is $7,500, plus a $1,100 catch-up at age 50 or older.
• Charitable deductions follow new rules starting in 2026. Itemizers can deduct only contributions above 0.5% of adjusted gross income, and taxpayers in the 37% bracket receive a benefit capped at the equivalent of 35%. Taxpayers who do not itemize can deduct up to $1,000 of qualifying cash gifts ($2,000 for married couples filing jointly). Corporations deduct only contributions above 1% of taxable income.

Each of these changes connects to one or more of the seven areas below.

1. Make Sure Your Books Actually Tell the Right Story

Good tax planning starts with reliable accounting. If the books are inaccurate, unreconciled or full of uncategorized transactions, every decision that follows becomes harder and every projection becomes less reliable.

Before year-end, review whether:

• Bank and credit card accounts are reconciled
• Major transactions are properly categorized
• Loans and owner contributions are recorded correctly
• Payroll agrees with the accounting records
• Accounts receivable and payable make sense
• The financial statements actually reflect what happened

This is also the right moment to collect Form W-9 from every vendor and contractor paid $2,000 or more in 2026. Forms W-2 and 1099-NEC are due by February 1, 2027, and gathering that information in November is far easier than chasing it in late January.

Clean books are not just about preparing a tax return. They show you what is happening inside the business. If your records need attention before year-end, our bookkeeping services are designed to close the year with financial statements you can rely on.

2. Know Where You Stand Before the Year Ends

Business owners should have a reasonable idea of what their tax position looks like before April, not when the return is filed. A year-end projection can help estimate:

• Expected business income
• Personal taxable income
• Estimated tax liability
• Payments already made
• Potential underpayments
• Planning opportunities that may still be available

The projection also answers a practical question: has enough been paid to avoid an underpayment penalty? In general, the penalty does not apply when withholding and estimated payments cover at least 100% of the prior year’s total tax (110% if prior-year adjusted gross income exceeded $150,000), or 90% of the current year’s tax. The fourth-quarter estimated payment for 2026 is due January 15, 2027.

The final number may change. That is normal. But there is a major difference between an estimate and a surprise.

3. Review How You Are Paying Yourself

As businesses grow, the way owners compensate themselves may need to change. This is especially important for S corporations, although the broader principle applies to many business structures.

Review:

• Payroll
• Owner distributions
• Reasonable compensation
• Reimbursements
• Retirement contributions
• Health insurance
• Other owner benefits

For S corporation owners, several of these items have a hard deadline. Reasonable compensation must be paid through payroll by December 31 to count for 2026. Health insurance premiums paid for shareholders who own more than 2% of the company must be included in their W-2 wages. Expense reimbursements should be processed under an accountable plan before the year closes.

Retirement contributions also depend on decisions made now. Employer contributions are often calculated as a percentage of W-2 wages, so the salary set today affects how much can be contributed. Some plans must be in place by December 31 to accept 2026 contributions, while others can be adopted later; confirming the deadline for your plan type is part of the review.

A structure that worked when the company was smaller may no longer be appropriate today. Year-end is a good time to make sure the compensation model still fits the business.

4. Do Not Buy Something Just Because It Is a Write-Off

A tax deduction does not make a bad purchase a good one.

With 100% bonus depreciation and expanded Section 179 limits, the tax benefits available for equipment, vehicles, technology and other qualifying business investments are significant in 2026. But the first question should still be:

Does the business actually need it?

If you spend $100 solely to save $30 in taxes, you are still $70 out of pocket.

There is also a timing rule that catches many owners off guard. To be deducted for 2026, an asset generally must be placed in service by December 31, meaning it is installed and ready for use in the business. Buying equipment on December 30 that is delivered or installed in January moves the deduction to 2027. Vehicles have their own limits and rules, so they deserve a separate review before purchase.

Tax planning should improve a good business decision. It should not be the reason for making a bad one.

5. Look Beyond the Business Tax Return

Year-end planning should consider the owner’s entire financial picture. Depending on the taxpayer, that may include:

• Retirement contributions and IRA or Roth planning, including whether a Roth conversion makes sense in a lower-income year
• Charitable giving, including whether to group several years of gifts into one year or fund a donor-advised fund, given the new 0.5% floor for itemizers
• Qualified charitable distributions from IRAs for owners age 70½ or older
• Investment gains and losses, including harvesting losses to offset gains while observing the wash-sale rule
• Health savings account contributions
• Estimated tax payments
• Major personal or financial changes

Someone building cash reserves may need a different strategy than someone maximizing retirement savings. Someone preparing to purchase real estate may have different priorities than someone planning to sell a company.

The right tax strategy should fit the taxpayer, not the other way around. Our individual tax advisory work coordinates these personal decisions with the business plan.

6. Ask Whether Your Business Structure Still Fits

Businesses evolve. Revenue grows, employees are hired, partners change, new services are added and assets are acquired. Owners begin thinking about expansion, succession or eventually selling. But sometimes the business structure never changes, and that can create problems.

Before year-end, consider whether the current structure still makes sense for where the business is today. That may include reviewing:

• Entity type
• Ownership
• Payroll
• Owner compensation
• Related businesses
• Real estate ownership
• Retirement plans
• Succession and exit planning

With the QBI deduction now permanent, entity decisions can be evaluated with a longer horizon than in previous years.

Location is part of the picture too. Florida does not impose a personal income tax, which simplifies part of the analysis for owners who live and operate here. Florida does levy a corporate income tax on C corporations, and owners with income, employees or operations in other states should review those state obligations as part of the same exercise.

The right structure creates the foundation for the right strategy. We explore this in more depth in The Right Tax Strategy Starts With the Right Structure, and it is a central part of our business tax advisory engagements.

7. Look at the Business, Not Just the Tax Bill

Tax planning should never happen in isolation. Before making a year-end decision, ask:

• How is cash flow?
• Are margins improving or declining?
• Do we have enough cash reserves?
• Is the business carrying too much debt?
• Are customers paying on time?
• Are expenses growing faster than revenue?
• What does next year realistically look like?

Sometimes the best tax decision is not the one that produces the largest deduction. Accelerating expenses into 2026 makes less sense if income is expected to rise significantly in 2027, and a large equipment purchase can strain cash flow even when the deduction is valuable.

The objective should be to improve the overall financial position of the business. Taxes are an important part of that equation. They are not the entire equation.

Key Year-End Dates

Final Thoughts

Year-end planning is not about scrambling in December to find deductions. It is about taking a step back and asking whether the financial, tax and business decisions made throughout the year still make sense.

Some opportunities may still be available. Some issues may still be correctable. And some decisions are simply better made before January 1 than after it.

At UpFront CPA, we believe good tax planning should be proactive, practical and built around the taxpayer’s actual goals. We work with business owners in Orlando and across Florida, and with clients in all 50 states through virtual consultations.

Because when tax season arrives, the return should ideally confirm the strategy. It should not be the first time we start looking for one.

Plan your year-end review. A review completed in November leaves time to act on what it finds before December 31. Schedule a consultation with our team.

Frequently Asked Questions

When should business owners start year-end tax planning?

Ideally in October or November. By then, most of the year’s results are known, and there is still time to adjust payroll, make purchases that will be placed in service before December 31, complete retirement and charitable decisions, and correct any estimated tax shortfall.

Can I still reduce my 2026 taxes in December?

Often, yes. Decisions such as paying reasonable compensation through payroll, placing qualifying equipment in service, harvesting investment losses and making charitable gifts must generally be completed by December 31 to count for 2026. Other items, such as certain retirement contributions, may be made after year-end. The options depend on each taxpayer’s situation.

What is the estimated tax safe harbor?

It is a rule that generally protects taxpayers from the underpayment penalty when withholding and estimated payments cover at least 100% of the prior year’s total tax (110% if prior-year adjusted gross income exceeded $150,000), or 90% of the current year’s tax. The fourth-quarter payment for 2026 is due January 15, 2027.

This article provides general information about federal and Florida tax rules in effect for 2026. It is not tax advice for any specific situation. Consult a CPA before acting on any strategy described here.