Tax-Loss Harvesting in 2026: A Year-End Guide for Business Owners

When you run a restaurant, laundromat, or cleaning business, your personal brokerage account may get attention only after closing. Perhaps you sold investments at a profit earlier this year, then watched another holding fall. Your account is back where it started—but your tax calculation may not be.

Tax-loss harvesting means selling an investment at a loss so that an eligible loss can enter your tax calculation. The goal is not to create losses or trade just for a deduction. It is to coordinate existing losses with your investment plan, tax position, and cash needs.

1. Start with the right account and the right numbers

This guide covers ordinary stocks and funds in personal taxable brokerage accounts under U.S. federal income tax rules. Losses inside an IRA or 401(k) are not deductible in the same way. Corporate investment accounts require separate analysis.

For typical stock holdings, price appreciation generally does not create a taxable capital gain until you sell. Likewise, a decline generally does not produce a deductible capital loss while you continue holding. Dividends and fund capital-gain distributions can still be taxable without a sale.

Holding periods matter: positions held one year or less generally produce short-term gains or losses; those held more than one year generally produce long-term results. These categories are netted under specific rules, so equal losses do not always produce equal tax savings.

2. Separate a completed gain from a paper loss

Suppose a cafe owner realizes $12,000 in short-term stock gains during 2026. Another holding cost $30,000 and is now worth $22,000: an $8,000 unrealized loss. Assume no other transactions or carryforwards.

Keeping the losing investment does not offset the $12,000 realized gain. That is not a penalty on paper profits; it reflects the different treatment of completed sales and investments still held.

Selling the losing position during 2026 could reduce net capital gains to $4,000. Assume the loss is also short-term, fully deductible, and unaffected by wash-sale or other restrictions. The reduction is $8,000 of taxable gain—not $8,000 of tax savings. Actual savings depend on applicable rates and the rest of the return.

Before selling, ask whether the investment still belongs in your portfolio and where the proceeds would go. Transaction costs and market exposure matter. Reinvesting at a different cost basis can also change future taxable gains, meaning part of today's benefit may be tax deferral rather than permanent savings.

Plan around the gains and losses you have actually realized, not the balance on your brokerage screen.

3. Check both sides of the wash-sale window

A loss can be disallowed currently if you acquire the same or substantially identical stock or securities within 30 days before or after the loss sale. Including the sale date, that is a 61-day review window.

Selling at a loss on December 31, 2026, and repurchasing on January 10, 2027, can trigger the rule. January does not reset the clock. A purchase before the sale can matter just as much.

Review other brokerage accounts, your spouse's transactions, and purchases in your IRA. Dividend reinvestment and recurring purchases can affect part of a loss even when only a few replacement shares are purchased.

In a taxable account, a disallowed wash-sale loss generally adjusts the replacement investment's basis, deferring the benefit. A replacement purchase in an IRA can instead cause permanent loss of the deduction.

Another company's stock may provide similar industry exposure without being substantially identical, but its investment risks will differ. With ETFs, a different ticker alone does not establish that the replacement is acceptable; examine the investments and indexes involved.

4. Understand what excess losses can—and cannot—offset

After capital gains and losses are netted, individuals can generally deduct up to $3,000 of remaining net capital losses against other income annually. The limit is $1,500 for married filing separately. Eligible unused losses generally carry forward to future years.

For example, a joint filer with a $10,000 net capital loss and sufficient income could deduct $3,000 this year and carry forward $7,000. The return's calculation determines the actual carryforward. Next year's gains and deduction limits determine how much becomes usable then.

This is a deduction, not a tax credit. If the entire $3,000 deduction reduces income otherwise taxed at a hypothetical 22% marginal federal rate, the federal income tax reduction is $660—not $3,000. State taxes and interactions with other tax provisions need separate review.

Stock losses do not become restaurant or construction business expenses. Nor does the ordinary investment capital-loss deduction generally reduce self-employment tax. If existing carryforwards already cover your gains and annual deduction, realizing additional losses may provide little or no immediate benefit.

5. Build a year-end review before placing trades

Start before holiday operations take over. For ordinary exchange-traded stocks, a sale generally must execute by year-end to count for 2026, typically based on trade date. Confirm product-specific rules and brokerage deadlines. An unfilled order is not a completed sale.

Verify missing basis information, especially for transferred investments. Brokerage-screen losses may differ from tax losses because of prior adjustments or lot selection.

If proceeds will support the business, check settlement and withdrawal timing separately. A tax trade date is not necessarily the date cash becomes available for payroll. Protect operating reserves first.

6. Finish with January monitoring and clean records

Continue monitoring purchases after a December sale. January activity can affect the previous year's deduction. Calendar the relevant window and confirm that automatic reinvestments do not undermine the plan.

At filing time, reconcile Form 1099-B with trade confirmations, basis records, and wash-sale adjustments. Transactions generally flow through Form 8949 and Schedule D. Retain carryforward calculations and review any corrected brokerage tax forms.

For a Kwon CPA review, bring three starting documents: current realized-gain reports, prior-year loss carryforward records, and planned purchases and sales. Add projected business income and estimated tax payments so the discussion reflects your full cash picture.

Harvesting is not always worthwhile. A low current tax rate or substantial existing carryforwards may reduce its value. The objective is a sound investment decision with fewer tax surprises—not the largest possible deduction.

This is general U.S. federal tax guidance. State rules, filing status, account type, and U.S. tax residency can change the result. Confirm your circumstances before trading.