2026 year-end tax planning checklist for business owners

Year-end tax planning should help you keep more of what your business earns and put more toward your financial goals.

But reducing this year’s tax bill isn’t always the best decision. Buying equipment you don’t need, draining business cash for a deduction, or lowering your salary without considering retirement contributions can leave you worse off.

The goal is to reduce unnecessary taxes without sacrificing cash flow, retirement savings, or future tax benefits.

Start with a tax projection. Then review the strategies that apply to your federal tax classification. An LLC, for example, can be taxed as a sole proprietorship, partnership, S corporation, or C corporation.

Year-end tax planning strategies for every business owner

Compare the tax savings with the actual cost

Before making a major purchase, changing compensation, or funding a retirement plan, compare your projected taxes and cash flow with and without the proposed strategy.

Your comparison should include:

• Federal and state taxes
• Business and personal cash remaining
• Retirement contributions
• Deductions or taxes shifted into future years
• Implementation and ongoing costs

Example: A $40,000 deduction at a 32% marginal income-tax rate saves $12,800 before other tax effects. You still spend $40,000. If your business doesn’t need the equipment, keeping the cash may be the better decision.

For each approved strategy, identify the action, amount, responsible person, and deadline.

Equipment purchases: take the deduction when it’s most valuable

Current federal law generally allows 100% bonus depreciation for eligible property acquired and placed in service after January 19, 2025. Section 179 offers another expensing option, subject to different limitations. IRS Publication 946

Consider 3 factors:

1. Your tax brackets: A deduction may be more valuable in a high-income year than a low-income year.
2. Loss limitations: A deduction that creates a tax loss doesn’t guarantee an immediate tax benefit.
3. Cash flow: Financing may allow an upfront deduction, but loan payments, interest, and maintenance continue.

Section 179 is generally limited by business income. Bonus depreciation doesn’t have that same limitation, although other rules may restrict your ability to use the resulting loss.

Before purchasing, compare the after-tax cost with the expected business benefit. To claim 2026 depreciation, qualifying equipment generally must be ready and available for business use by December 31. Ordering it or paying a deposit isn’t enough.

Retirement plans: compare contributions, taxes, and business cash flow

Retirement contributions can reduce current taxes while building wealth outside your business.

Traditional tax-deferred contributions generally reduce taxable income today, with withdrawals taxed later. Whether that benefits you depends partly on your current and future tax rates.

Compare retirement plans based on:

• Maximum allowable owner contributions
• Required contributions for eligible employees
• Available business cash
• Administrative costs and ongoing obligations
• Traditional versus Roth tax treatment

A solo 401(k) can combine employee deferrals and employer contributions. A SEP IRA generally uses employer contributions. For businesses with employees, compare the total employer cost rather than just the owner’s deduction.

Owners with consistently high profits may also consider cash-balance or other defined-benefit plans, which require more extensive funding and administration.

2026 employee 401(k) contribution limits

These limits assume the plan permits applicable catch-up contributions. Employer contributions are separate, and other annual limits apply.

Plan establishment, employee elections, payroll processing, and contribution funding can have different deadlines. Confirm each before year-end. IRS Publication 560

S corporation year-end tax planning

Pay reasonable compensation without overpaying employment taxes

S corporation shareholder-employees must receive reasonable W-2 compensation for their services before taking nonwage distributions. The IRS can reclassify distributions as wages when compensation is inadequate.

The opportunity is to distinguish compensation for your work from profits generated by employees, equipment, and other business assets.

Example: An S corporation earns $250,000 before owner compensation and employer payroll taxes. If a documented analysis supports $110,000 in reasonable wages, the remaining profit doesn’t automatically need to become additional salary.

Conversely, choosing $40,000 in wages merely to increase distributions doesn’t make that compensation reasonable. These amounts illustrate the analysis, not a recommended salary ratio.

Before final payroll:

1. Document your duties, hours, responsibilities, and experience
2. Compare compensation for similar positions
3. Identify revenue generated by your work versus other business resources
4. Compare supported compensation with wages already paid
5. Process necessary payroll adjustments and retain the documentation

The objective is defensible compensation, not the lowest possible salary. IRS: S corporation compensation

Coordinate owner wages with retirement contributions

Lower wages may reduce employment taxes, but they can also reduce retirement contribution limits.

S corporation distributions don’t count as retirement-plan compensation. Employee deferrals and employer contributions generally depend on qualifying W-2 wages.

Example: Under a plan allowing a 25% employer contribution:

• $100,000 in eligible wages could support a $25,000 employer contribution
• $60,000 in eligible wages could support $15,000

These figures exclude employee deferrals and assume all other requirements are satisfied.

Before reducing wages, compare employment taxes, retirement contribution capacity, the qualified business income deduction, and cash remaining. IRS: S corporation retirement contributions

Report shareholder health insurance correctly

For shareholders owning more than 2%, qualifying health-insurance premiums paid or reimbursed by the S corporation generally belong in Box 1 of Form W-2, but not Social Security or Medicare wages.

Proper reporting may allow an eligible shareholder to claim the self-employed health-insurance deduction on their individual return.

If you paid premiums personally, arrange any required corporate reimbursement and payroll reporting before year-end. Simply providing receipts during tax preparation may not be sufficient. IRS: Shareholder health insurance

Verify shareholder basis before distributions or loss deductions

A loss on Schedule K-1 isn’t automatically deductible.

You need sufficient stock or qualifying debt basis, and other limitations may apply. Personally guaranteeing a corporate bank loan generally doesn’t create shareholder debt basis.

Distributions require separate attention: debt basis cannot prevent a distribution exceeding available stock basis from creating taxable gain.

Before a large distribution or planned loss deduction, update shareholder basis. If basis is insufficient, evaluate whether a genuine capital contribution or qualifying direct loan makes financial sense. IRS: S corporation stock and debt basis

Partnership and multi-member LLC year-end tax planning

This section applies to partnerships and LLCs taxed as partnerships.

Plan tax distributions around allocated income

Partners generally owe income tax on their allocated share of partnership income, even when the business retains the money.

Example: A partner allocated $100,000 of taxable income may owe tax on the entire amount despite receiving only $30,000 in distributions.

Before year-end, prepare a partner-level estimate showing taxable income, guaranteed payments, distributions, estimated tax payments, and additional cash needed for taxes.

Review distributions against the partnership agreement, available cash, and each partner’s outside basis. Distributions exceeding basis can create taxable gains. IRS Publication 541

Separate guaranteed payments, profit allocations, and draws

Partners generally aren’t W-2 employees of their partnership.

Guaranteed payments, allocated profits, and cash distributions have different tax treatments. Relabeling a payment doesn’t automatically eliminate self-employment tax.

Reconcile each payment against the partnership agreement. Then determine how it affects self-employment taxes, retirement contributions, and the qualified business income deduction.

Limited-partner and LLC-member self-employment tax treatment can require additional analysis.

Review partnership debt and loss limitations

Unlike S corporations, partnership owners may receive tax basis from their allocated share of certain partnership liabilities.

That basis can affect deductible losses and distributions, but at-risk and passive-loss restrictions may still apply.

Debt repayments, refinancing, or ownership changes can reduce a partner’s share of liabilities. This may be treated as a cash distribution and potentially trigger taxable gains.

Before changing partnership debt or making major distributions, update each partner’s outside basis and loss calculations. IRS Publication 541

C corporation year-end tax planning

Compare owner compensation, dividends, and retained earnings

C corporations generally pay federal income tax at 21%. Shareholders may owe additional taxes when after-tax profits are distributed as dividends.

Reasonable compensation for actual services is generally deductible by the corporation. Dividends aren’t.

Compare the combined corporate and personal taxes, retirement contributions, and remaining cash—not just the corporation’s 21% tax rate. IRS Publication 542

Confirm bonus payment and deduction timing

Recording a bonus in December doesn’t automatically make it deductible in 2026.

Cash-method corporations generally deduct compensation when paid. Accrual-method corporations must satisfy additional requirements, and related-party rules can delay deductions.

Before recording a year-end bonus, confirm the corporation’s accounting method, recipient’s ownership, and required payment date.

Document why profits remain in the corporation

Retaining earnings for working capital, expansion, equipment, or debt repayment may be appropriate.

However, accumulating earnings beyond reasonable business needs can create additional tax exposure.

Document substantial retained earnings using cash-flow forecasts, capital budgets, debt obligations, or expansion plans.

Reconcile corporate estimated taxes separately from the owner’s personal payments. Corporate estimated-tax rules differ from individual safe harbors.

Sole proprietor and single-member LLC year-end tax planning

This section applies to sole proprietors and individual-owned single-member LLCs taxed as disregarded entities.

Reduce taxable business profit with documented deductions

These businesses generally report operating income on Schedule C.

Owner draws aren’t deductible, and leaving money in the business account doesn’t defer income tax.

Review:

• Business expenses paid from personal accounts
• Business mileage and vehicle expenses
• Home-office eligibility
• Deductible health-insurance premiums
• Necessary year-end expenses and prepayments

For cash-method businesses, qualifying payments made by December 31 may accelerate deductions. Prepayments and asset purchases can follow different rules.

Self-employed retirement contributions and eligible health-insurance deductions generally reduce personal income tax but don’t reduce Schedule C profit or self-employment tax like ordinary business expenses. IRS Publication 334

Calculate retirement contributions using eligible earnings

Self-employed retirement contributions depend on eligible net earnings, not gross revenue or owner draws.

A SEP IRA can generally be established and funded by the tax-return deadline, including extensions.

Eligible sole proprietors without employees may also qualify for special first-year 401(k) rules allowing post-year-end adoption and contributions. These rules don’t automatically apply to S corporations or existing plans.

Compare contribution limits, employee requirements, administrative costs, and deadlines before choosing a plan. IRS Publication 560

Evaluate whether an S corporation election would save taxes

An S corporation election may reduce employment taxes when your business generates profit beyond reasonable owner compensation.

But the savings must exceed the additional costs.

Compare:

• Profit before owner compensation
• Reasonable W-2 salary
• Payroll and tax-compliance costs
• State taxes and entity fees
• Retirement contribution capacity
• Changes to the qualified business income deduction

Businesses earning most of their revenue directly from the owner’s services may have less opportunity to separate wages from business profits.

Don’t use a universal revenue threshold or salary ratio. Calculate annual net savings after all recurring costs and tax effects before electing S corporation status for 2027.

Additional tax planning for pass-through business owners

Calculate how deductions affect qualified business income

Eligible owners of sole proprietorships, partnerships, and S corporations may deduct up to 20% of qualified business income (QBI), subject to limitations.

S corporation shareholder wages and partnership guaranteed payments generally aren’t QBI. Certain business deductions, including qualifying retirement-plan deductions, may also reduce QBI.

Example: A $10,000 business deduction reduces an otherwise fully available 20% QBI deduction by $2,000.

The net taxable-income reduction becomes $8,000. At a 32% marginal income-tax rate, that’s $2,560 in federal income-tax savings before other effects—not $3,200.

Before approving major deductions or compensation changes, calculate the resulting QBI deduction. At higher incomes, business type, wages, and qualifying property can further limit the benefit. IRS: Qualified business income deduction

Evaluate state pass-through entity tax elections

Eligible S corporations and partnerships may reduce federal tax exposure through state pass-through entity tax elections.

Rules, deadlines, owner credits, and federal deduction treatment vary by state.

Compare the entity payment, owner tax credits, federal deduction, and required cash. Confirm the election deadline before making payments.

Personal year-end tax planning for business owners

Avoid estimated-tax penalties without overpaying

Estimated-tax planning requires 2 calculations:

1. How much must you pay, and when, to avoid underpayment penalties?
2. How much tax will remain due when you file?

For individuals, the general federal safe harbor is based on paying 90% of current-year tax or 100% of prior-year tax. The prior-year requirement increases to 110% when prior-year adjusted gross income exceeds $150,000, or $75,000 for married filing separately, assuming the applicable requirements are met.

Meeting a safe harbor doesn’t eliminate the remaining tax bill.

If you receive W-2 wages, increasing year-end withholding may help address earlier underpayments because withholding is generally treated as paid evenly throughout the year. A late estimated payment ordinarily doesn’t correct earlier missed installments.

Owners with uneven income should also consider the annualized-income installment method. IRS Publication 505

Coordinate investment decisions with your business taxes

Your business deductions, retirement contributions, investment gains, and personal income should be evaluated together.

Consider:

• Tax-loss harvesting: Realize losses to offset capital gains while accounting for wash-sale restrictions
• Roth conversions: Evaluate conversions against projected tax brackets, Medicare surcharges, and other income-based limitations
• Charitable giving: Consider eligible appreciated securities or donor-advised funds instead of cash where appropriate
• Required minimum distributions: Complete required 2026 distributions unless an exception applies
• Retirement contributions: Compare current deductions with future tax rates and access to retirement funds

For example, a large business deduction might create room for a Roth conversion at a lower marginal tax rate. But the conversion adds taxable income, while some retirement deductions can reduce QBI.

Calculate the combined impact before implementing separate strategies.

2026 year-end tax planning checklist

Select your federal tax classification and complete the corresponding checklist.

2027 federal tax deadlines by entity

These dates apply to calendar-year taxpayers filing 2026 returns. Extended deadlines require timely extension requests.

Status: These are expected dates based on established federal filing rules. As of October 26, 2026, the available 2027 IRS Publication 509 remains a draft. Confirm the final calendar before filing.

Important: Filing extensions generally do not extend tax payment deadlines.

Other important 2026–2027 tax deadlines

The general Form 1099-NEC reporting threshold for qualifying nonemployee compensation paid in 2026 is $2,000, subject to exceptions. Other information-return requirements have separate thresholds.

Payroll tax deposits also have their own schedules. Form 941 filing deadlines don’t postpone monthly, semiweekly, or next-day deposit requirements.

Retirement-plan deadlines depend on the plan

• SEP plans can generally be established and funded by the business return deadline, including extensions
• Employer contributions to many qualified plans may be funded by the applicable return deadline, subject to plan requirements
• Employee deferral elections and payroll requirements have separate deadlines
• Certain eligible sole proprietors may qualify for special first-year solo 401(k) adoption and contribution rules

Before relying on any deadline: Confirm applicable plan rules, state requirements, and the final IRS calendar. Disaster relief and special tax rules may change individual deadlines.

Turn your year-end tax plan into action

Your year-end review should produce specific decisions, not another list of strategies to consider.

The goal isn’t to claim every available deduction. It’s to make the decisions that improve your after-tax position while supporting your business and personal financial goals.

WealthAdvisor365 helps business owners coordinate tax planning, investment management, and retirement planning.

Schedule a complimentary introductory consultation to discuss your year-end tax planning needs.