Seeing red numbers in an investment portfolio is rarely comfortable.

But for investors with significant taxable assets, a temporary decline in value isn't necessarily just bad news. In the right circumstances, it may create an opportunity to improve the portfolio while also reducing the tax cost of investing.

As we approach year-end, one strategy worth reviewing is tax-loss harvesting.

At its simplest, tax-loss harvesting involves selling an investment for less than its cost basis and realizing the loss for tax purposes. That loss can then potentially offset capital gains elsewhere in your portfolio.

But for families managing substantial wealth, the real value of tax-loss harvesting isn't simply generating a deduction. It's coordinating investment decisions with tax strategy to improve after-tax outcomes over time.

Start With the Portfolio, Not the Tax Return

Suppose an investment you purchased has declined in value. Selling it may create a capital loss that can offset realized gains elsewhere.

If total capital losses exceed capital gains, current tax rules may also allow a portion of those losses to offset ordinary income, with unused losses generally carried forward to future tax years.

That can be valuable.

But the tax benefit should never be the sole reason for making an investment decision.

The better question is:

Can we use this opportunity to improve the portfolio while capturing a tax benefit at the same time?

Perhaps a position has become too concentrated. Maybe an investment no longer fits the portfolio's long-term strategy. Or perhaps market movements have created an opportunity to rebalance while realizing losses that can offset gains elsewhere.

When those objectives align, tax-loss harvesting becomes much more powerful.

The Opportunity Can Be Greater in Larger Portfolios

For investors with substantial taxable portfolios, the stakes can be considerably higher.

Over time, portfolios may accumulate significant embedded capital gains. There may also be concentrated stock positions, appreciated real estate, business interests, charitable strategies, or other transactions that generate taxable gains.

A loss harvested today doesn't necessarily have to solve a tax problem today.

Unused capital losses can generally be carried forward, potentially creating a valuable tax asset for future years when gains are realized.

That means tax-loss harvesting shouldn't necessarily be viewed as a December tax exercise. It can be part of an ongoing, multiyear capital gains strategy.

Be Careful of the Wash-Sale Rule

There is an important complication: the wash-sale rule.

If you sell an investment at a loss and purchase the same or a substantially identical security within 30 days before or after the sale, the current deduction of that loss may be disallowed.

And this can become more complicated than investors realize.

Automatic dividend reinvestments, purchases in other accounts, and certain transactions involving a spouse can potentially interfere with the strategy.

That's one reason tax-loss harvesting becomes increasingly valuable to coordinate across the entire financial picture rather than managing each account independently.

Tax Efficiency Is About More Than Paying Less Tax

One of the mistakes investors can make is allowing the desire to reduce taxes to drive the investment strategy.

The objective isn't simply to pay the least amount of tax possible this year.

The objective is to maximize after-tax wealth while maintaining a portfolio aligned with your long-term goals.

Sometimes realizing a gain is the right decision.

Sometimes harvesting a loss is the right decision.

And sometimes doing nothing is the most efficient choice.

The answer depends on how investments, taxes, cash flow, charitable planning, estate objectives, and future liquidity needs fit together.

Final Thought

For affluent investors, tax-loss harvesting is most effective when it isn't treated as an isolated year-end tactic.

It's one component of a broader tax-aware investment strategy.

Before year-end, it's worth reviewing taxable accounts, realized gains and losses, embedded gains, and positions currently trading below their cost basis. Those decisions should also be coordinated with your tax professional before trades are made.

At Clarity Wealth, this type of review is part of the ongoing planning process for our clients. Because thoughtful wealth management isn't simply about what your portfolio earns.

It's about how much of that wealth you ultimately keep—and how efficiently it supports the people, priorities, and legacy that matter to you.