Tax-Loss Harvesting: The Portfolio Strategy That Could Save High Earners $57,000 in 2026

You're earning $640,000 a year. You've got a $1.8 million portfolio — stocks, ETFs, maybe some individual positions you've held for years. Your investment advisor manages the allocations. Your CPA files the return. And in April, you wrote a check for the capital gains tax and figured "that's just how it works."

It's not how it has to work.

There's a strategy that sits in the gap between your investment advisor and your CPA — a strategy that most high earners never hear about until they've already overpaid by tens of thousands of dollars. It's called tax-loss harvesting, and in 2026, it matters more than it ever has.

What Is Tax-Loss Harvesting? (And Why You've Never Heard About It)

Tax-loss harvesting is simple: you sell investments that have lost value, realize the loss for tax purposes, and use that loss to offset capital gains — or up to $3,000 of ordinary income per year.

The strategy isn't new. What's new is the 2026 tax environment, where every dollar of capital gain you can offset is worth significantly more than it was a year ago.

Here's a concrete example:

You own a position in a tech ETF that you bought for $120,000. Today it's worth $78,000. You don't sell because you're waiting for it to bounce back. That's emotion, not strategy.

If you sell it now, you realize a $42,000 capital loss. You can immediately reinvest in a similar (but not substantially identical) fund — say an S&P 500 index ETF instead of the tech-heavy one — so you stay in the market. You haven't lost your upside. But you've just created $42,000 in tax losses you can deploy.

Why 2026 Changes Everything for Capital Gains

Here's what most high earners don't realize: the Tax Cuts and Jobs Act provisions that shaped tax rates over the last several years have shifted the landscape. The income thresholds have adjusted, and the net investment income tax of 3.8% remains in full effect.

For a high earner in 2026:

• Long-term capital gains rate (top bracket): 20%
• Net Investment Income Tax (NIIT): 3.8%
• Effective top rate on investment income: 23.8%

When you're earning $640,000 and paying 23.8% on every dollar of capital gain, a $200,000 gain costs you $47,600 in tax. That's a significant chunk of your returns — money that could be compounding in your portfolio instead of going to the IRS.

Tax-loss harvesting lets you turn market volatility — which every investor experiences — into a tax advantage. Those realized losses directly offset your realized gains, dollar for dollar.

The Mid-Year Window: Why June Is the Time to Act

Most investors think about tax-loss harvesting in December, when they're scrambling to clean up their portfolios before year-end. That's a mistake.

Here's why mid-year is actually the optimal time:

1. More loss positions available — Markets fluctuate all year. By June, you likely have several positions trading below their cost basis, especially after the volatility earlier this year.
2. More time to navigate the wash sale rule — You have a full six months to manage the 30-day window without feeling rushed or making mistakes.
3. Better planning data — You can see your year-to-date realized gains and make targeted harvesting decisions with clarity.
4. No year-end crunch — December harvesting happens in thin holiday markets with everyone trying the same move at once.

Waiting until December means you're acting under pressure, with fewer options, in less favorable conditions. June 15 — the Q2 estimated tax deadline — is the perfect trigger date to take a hard look at your portfolio.

A Real-World Scenario: How $76,000 Became $19,000

Let's put real numbers to this.

Meet Dr. Chen (not his real name — anonymized client story)

Dr. Chen is a surgeon in San Diego earning $680,000 a year. He has a $2.4 million portfolio spread across taxable brokerage accounts. In 2025, he realized $320,000 in capital gains from rebalancing and selling company stock.

His CPA told him he owed $76,160 in capital gains tax (23.8% × $320,000). Dr. Chen wrote the check and moved on.

What Dr. Chen's CPA never looked at: his portfolio also held $240,000 in unrealized losses across several positions. If those losses had been harvested before year-end, his taxable gain would have dropped from $320,000 to $80,000 — and his tax bill from $76,160 to $19,040.

That's $57,120 in tax he paid that he didn't have to.

The difference? No one was looking at his portfolio and his tax return at the same time. His investment advisor managed returns. His CPA filed taxes. The gap between them cost Dr. Chen more than $57,000 in a single year.

The Wash Sale Rule: The Mistake That Costs Investors Dearly

Tax-loss harvesting has one critical rule you need to understand: the wash sale rule.

If you sell a security at a loss and buy a substantially identical security within 30 days before or after the sale, the loss is disallowed. You can't claim it on your taxes.

This is the most common mistake high earners make. They sell their Apple stock at a loss, then buy it back two weeks later when it dips further — not realizing they've just wiped out their entire tax benefit.

The fix is straightforward:

• Don't buy the same security within the 30-day window.
• Buy something similar but not identical instead. An S&P 500 ETF replaces a tech-sector ETF. A total market fund replaces a growth fund. You stay invested, the wash sale clock stays clean, and your loss stays intact.
• Watch your dividends — automatic dividend reinvestment can also trigger a wash sale if it buys shares within the restricted window.

How to Make Tax-Loss Harvesting Work for You

Tax-loss harvesting isn't a DIY project for most high earners. It requires coordinating your portfolio management with your tax strategy — which means your investment advisor and your tax strategist need to talk to each other. At most firms, they don't.

At Roadmap Tax, that's exactly what we do. Jesse Lipscomb holds both Enrolled Agent and Series 65 Financial Advisor credentials — so your tax strategy and investment strategy live under one roof, not in separate silos.

Here's what a coordinated approach looks like:

1. Portfolio audit — Review all taxable accounts for unrealized losses
2. Gain/loss analysis — Match those losses against year-to-date realized gains
3. Harvesting plan — Execute targeted sales timed to avoid wash sales
4. Reinvestment — Immediately redeploy capital into similar positions to stay in the market
5. Tracking — Carry forward any unused losses to future tax years (they never expire)

The result? You keep more of what you earn, without changing your investment strategy or taking on more risk.

Want to see what you're leaving on the table? Book a free 30-minute strategy session — no obligation, no pressure, just straight talk about your numbers. Call (619) 280-2700 or email info@RoadmapTax.com.

FAQ

What is tax-loss harvesting?

Tax-loss harvesting is the practice of selling investments at a loss to offset capital gains taxes. The losses can also offset up to $3,000 of ordinary income per year, with unused losses carrying forward to future tax years indefinitely.

How much can I save with tax-loss harvesting?

The savings depend on your portfolio size and capital gains profile. For high earners with six-figure portfolios, savings typically range from $10,000 to $50,000+ per year, depending on available losses and realized gains for the year.

When should I do tax-loss harvesting?

Mid-year (June through August) is ideal because it gives you time to navigate the wash sale rule without the pressure of year-end deadlines. However, harvesting can be done anytime you have unrealized losses in your portfolio.

What is the wash sale rule?

The wash sale rule disallows a tax loss if you buy a substantially identical security within 30 days before or after the sale. To avoid it, wait at least 31 days before repurchasing the same security, or buy a similar but not identical investment instead.

Can I do tax-loss harvesting if I don't have capital gains this year?

Yes. Even without current capital gains, you can harvest losses to offset up to $3,000 of ordinary income per year. Any unused losses carry forward indefinitely and can be used against future gains or future ordinary income.