Tax-Loss Harvesting as a Couple in 2026

For a married couple filing jointly, tax-loss harvesting is a household calculation. A loss in one spouse's brokerage account may offset a gain in the other spouse's account on the joint return, while a purchase by either spouse can create a wash sale.

The planning opportunity is broader than finding red positions. Couples need to coordinate capital gains, loss carryforwards, qualified dividends, ordinary income, and trades across every account.

The 2026 0% Capital-Gains Threshold

For tax year 2026, the maximum 0% long-term capital-gains amount is $98,900 for married couples filing jointly. This figure refers to taxable income, not gross income, portfolio withdrawals, or the amount of stock sold.

Ordinary taxable income fills the lower brackets first. Qualified dividends and net long-term capital gains stack on top. For example, if a couple already has $80,000 of ordinary taxable income, only part of the remaining band may be available for qualified dividends and long-term gains at 0%. State tax can still apply even when the federal rate is zero.

Losses and the 0% Band Solve Different Problems

Capital losses first offset capital gains. If losses exceed gains, a couple filing jointly may generally deduct up to $3,000 of net capital loss against other income and carry the rest forward.

That means a loss carryforward can help a couple diversify appreciated positions without consuming as much of the 0% band. It does not directly erase an unlimited amount of dividend income.

Consider a couple with $15,000 of qualified dividends, $25,000 of planned long-term gains, and a $10,000 long-term loss carryforward. Subject to the complete return, the carryforward may reduce the net long-term gain to $15,000. The qualified dividends and remaining gain then use the applicable capital-gains rate schedule.

The Household Wash-Sale Trap

IRS guidance states that a wash sale can occur when an investor sells stock at a loss and a spouse buys substantially identical stock within 30 days before or after the sale. Other commonly missed purchases include:

Automatic dividend reinvestment.
Recurring buys in a second brokerage account.
Equity awards or employee stock-purchase activity.
Purchases inside an IRA or Roth IRA.
An advisor-managed account that trades independently.

The window is 61 calendar days in total: the sale date, 30 days before, and 30 days after. Review both spouses' accounts before placing the loss trade.

A Useful Annual Workflow

Estimate the joint return's ordinary taxable income.
Add expected qualified dividends and realized long-term gains.
Confirm short- and long-term carryforward balances from the prior return.
Identify portfolio sales that are desirable even without a tax benefit.
Check replacement purchases across both spouses' accounts.
Model federal and state results before executing.

This turns tax-loss harvesting into portfolio planning instead of a year-end scavenger hunt.

When Coordination Matters Most

Household planning is especially useful during a career break, early retirement, a concentrated-stock diversification, a charitable-giving year, or a large portfolio rebalance. These events can change taxable income and create a temporary opportunity to realize gains at a lower rate.

The calculation is sensitive to deductions, Social Security, Medicare premiums, net investment income tax, and state rules. A tax professional can model effects that a brokerage dashboard will not show.

For the federal loss rules, read carryforward losses explained. For multi-account trading controls, use the multiple-account checklist.

Bottom Line

Couples get the most from tax-loss harvesting when they coordinate the entire household. Use the 2026 0% threshold correctly, keep capital-loss and dividend rules separate, and monitor both spouses' purchases for wash sales.