How to Cut Your 2026 Tax Bill Before December 31: A Q4 Checklist for Small Businesses

Small-business owner reviewing a year-end tax planning checklist with an accountant

If you own a small business, December 31 is more than the end of the calendar year. It’s your last major deadline to make many decisions that can affect your 2026 federal tax bill.

The One Big Beautiful Bill Act (OBBBA) is now shaping your first full tax year under the updated rules. For 2026, the QBI deduction is permanent, 100% bonus depreciation is permanent for qualifying property, and the maximum Section 179 deduction is $2,560,000 (subject to limitations and phase-outs).

Here’s your actionable Q4 checklist. We’ll focus on what you can do before year-end, not just what you’ll report after the year closes.

Important: This article is for general educational purposes and reflects federal tax rules and IRS guidance available as of September 22, 2026. Your eligibility may depend on your entity type, accounting method, business income, personal income, state law, and other facts. Please consult your tax professional before acting.

1. By October 15: Review Your 2026 Tax Projection

Before you buy equipment, accelerate expenses, or change your payroll, you need a current estimate of your 2026 taxable income.

Ask your accounting professional to review:

  • Year-to-date revenue and expenses
  • Expected fourth-quarter sales
  • Payroll and owner compensation
  • Estimated tax payments
  • Depreciation from prior years
  • Pass-through income and the QBI deduction
  • Losses, credits, and carryforwards
  • Cash flow available for year-end purchases

A tax projection helps you avoid making a deduction that looks attractive but creates a cash-flow problem, or reduces another deduction you may need.

For example, purchasing $100,000 of equipment may produce a large current-year deduction. However, if the purchase leaves you short of funds for payroll or vendor obligations, it may not be the best business decision.

Action item: Schedule a Q4 tax-planning meeting and bring your latest profit-and-loss statement, balance sheet, fixed-asset list, and estimated income through December 31.

2. Decide Whether Section 179 or Bonus Depreciation Fits Your Plan

For qualifying business property placed in service during 2026, you may have two important tools:

  • Section 179: Up to $2,560,000 for 2026, subject to the business-income limit and phase-out rules.
  • Bonus depreciation: 100% for eligible property acquired and placed in service after January 19, 2025 (permanent under current law).

Eligible property may include:

  • Machinery and equipment
  • Computers and certain off-the-shelf software
  • Office furniture
  • Qualified improvement property
  • Certain business vehicles
  • Other tangible property used in your trade or business

The IRS generally applies these deductions in this order:

  1. Section 179 election
  2. Bonus depreciation
  3. Regular MACRS depreciation

Section 179 is limited by business taxable income, while bonus depreciation generally isn’t subject to that same Section 179 income cap. However, other limitations, basis rules, vehicle restrictions, and business-use requirements may apply.

Most importantly, an asset must be placed in service by December 31. Ordering equipment in December isn’t enough if it hasn’t been delivered, installed, and made ready for business use.

For example, if you purchase a commercial oven on December 20 but it isn’t installed and operational until January 2027, it may belong to your 2027 tax year, not 2026.

See IRS Publication 946 for the federal depreciation rules.

Business owner and accountant organizing receipts and equipment purchase documents

Action item: By November 15, identify equipment you genuinely need, confirm delivery and installation timing, and ask us to model the Section 179 and bonus depreciation impact before you sign the purchase agreement.

3. Review Your QBI Deduction and Owner Compensation

The qualified business income deduction (QBI deduction) remains available for qualifying pass-through businesses, including many sole proprietorships, partnerships, and S corporations. Under OBBBA, the deduction is now permanent (subject to future law changes).

The deduction may be worth up to 20% of qualified business income, but it can be limited by:

  • Taxable income
  • W-2 wages
  • The unadjusted basis of qualifying property
  • The type of business you operate
  • Your filing status
  • Whether your business is a specified service trade or business

Your year-end planning should coordinate profit, wages, retirement contributions, depreciation, and owner distributions. Taking a large depreciation deduction can reduce business income, which may also reduce the dollar value of your QBI deduction. That doesn’t automatically make depreciation a bad idea, but you should evaluate the combined result.

If you operate as an S corporation, review whether your owner compensation is reasonable and properly processed through payroll. Owner distributions are NOT a substitute for required reasonable compensation.

Action item: Ask for a combined projection showing your income tax, payroll tax, QBI deduction, and estimated payments, not just one isolated deduction.

4. Accelerate Ordinary and Necessary Business Expenses, Carefully

If you use the cash method, paying certain ordinary and necessary business expenses before December 31 may allow you to claim them in 2026. An expense generally must be:

  • Ordinary (common and accepted in your industry)
  • Necessary (helpful and appropriate for your business)
  • Properly documented
  • Related to your business rather than personal use

Possible year-end expenses may include:

  • Office supplies
  • Professional fees
  • Repairs and maintenance
  • Business insurance (subject to prepaid-expense rules)
  • Advertising
  • Software subscriptions
  • Employee bonuses
  • Business licenses and regulatory fees

But don’t create expenses just to chase a deduction. Spending $1 to save a fraction of that amount in taxes is still a net cash outflow.

Also watch the boundaries:

  • Country club dues are generally NOT deductible.
  • Entertainment expenses are generally NOT deductible.
  • Business meals are commonly limited to 50%.
  • Personal portions of cell phone bills, vehicles, travel, and home expenses are NOT deductible.
  • A business trip must have a clear business purpose and appropriate records.

For example, you may deduct the business portion of a cell phone bill, but not your entire family plan simply because you occasionally answer business calls. Likewise, a business trip may qualify for transportation and lodging deductions, while personal sightseeing expenses generally don’t.

See the IRS Tax Guide for Small Business for more information about business expenses.

Action item: By December 15, reconcile your business credit cards and bank accounts, collect missing receipts, and separate business and personal charges.

5. Check Payroll, Bonuses, and Retirement Contributions

Year-end payroll decisions can affect both your business deduction and your personal tax situation.

Before December 31, review:

  • Employee bonuses
  • Accrued wages
  • Owner payroll
  • Health insurance benefits
  • Retirement plan contributions
  • Accountable-plan reimbursements
  • Personal use of company vehicles
  • Payroll tax deposits and filings

A year-end employee bonus may be deductible in 2026 if it meets the applicable timing and accounting rules. However, it must be processed correctly through payroll (including withholding and reporting).

You should also review retirement planning. Depending on the plan, contributions may be allowed after December 31, but the plan may need to be established before year-end. A SEP IRA, SIMPLE IRA, 401(k), or other qualified plan can have different setup and contribution deadlines.

Do NOT wait until tax filing season to ask whether you can establish a retirement plan. The setup deadline may arrive before the contribution deadline.

Small-business owner reviewing payroll reports with a bookkeeper

Action item: By December 15, contact your retirement-plan provider and payroll professional to confirm setup, contribution, and reporting deadlines.

6. Clean Up Your Books and Prepare Year-End Records

Accurate bookkeeping is one of the most effective tax-planning tools you have. If your books are incomplete, you may miss deductions, overstate income, or make decisions using unreliable numbers.

Before December 31, complete the following:

  1. Reconcile every business bank account and credit card.
  2. Review accounts receivable and unpaid invoices.
  3. Identify business debts that may be uncollectible.
  4. Count and document inventory (if applicable).
  5. Update your fixed-asset list.
  6. Record business mileage and vehicle use.
  7. Gather receipts for travel, meals, and equipment.
  8. Verify contractor payments and W-9 information.
  9. Review payroll records and year-end benefits.
  10. Save copies of major contracts, invoices, and financing documents.

If you paid contractors $600 or more for qualifying services during 2026, you may have information-reporting obligations. Forms such as 1099-NEC generally have strict deadlines, so confirm your requirements before January.

Action item: Upload your year-end documents through your secure client portal and ask for a bookkeeping cleanup before your final tax projection.

7. Don’t Forget Your Personal Tax Picture

Your business decisions may affect your individual return. For 2026, the federal standard deduction is:

  • $16,100 for single filers
  • $32,200 for married couples filing jointly

Your business income may also affect self-employment tax, estimated payments, retirement contributions, and the QBI deduction.

That’s why year-end planning shouldn’t stop at your business tax return. Your business and personal finances are connected, especially when you operate a pass-through entity.

Your December 31 Tax Planning Checklist

Before the year closes, confirm that you have:

  • Completed a 2026 tax projection
  • Reviewed Section 179 and bonus depreciation options
  • Confirmed qualifying assets will be placed in service by December 31
  • Modeled the QBI deduction and owner compensation
  • Reviewed payroll, bonuses, and retirement plans
  • Reconciled bank and credit-card accounts
  • Documented mileage, travel, and business expenses
  • Reviewed contractor payments and W-9s
  • Separated business and personal expenses
  • Scheduled your 2027 estimated tax payments

Plan Before the Deadline, Not After It

The best year-end tax strategy is one that supports your business goals, cash flow, and long-term financial plan. EMC Financial Management Resources, LLC provides tax planning, accounting, bookkeeping, payroll, and business consulting with our State of the Art Personal Service approach.

We’ll help you assess your specific situation, identify potential opportunities, and avoid decisions based on outdated rules or incomplete information. Schedule a consultation with EMC Financial Management Resources, LLC or explore our tax preparation and planning services.

The December 31 deadline won’t move. Your planning should start now.