Tax-loss harvesting (TLH) is a well-known technique for managing taxable investment portfolios. The strategy involves selling securities at a loss to offset gains elsewhere in the portfolio, thereby reducing an investor’s tax liability. When applied correctly, tax-loss harvesting can provide meaningful tax savings. 

However, despite its popularity, traditional (i.e. “long-only”) Tax-Loss Harvesting is not always sufficient, particularly for high-net-worth investors with complex portfolios, recurring capital gains, or long-term tax planning objectives. While tax-loss harvesting can still play a role, it is often limited by structure, timing, and market timing. 

This article outlines several important limitations of tax-loss harvesting and explains why more consistent, proactive tax strategies may be required. 

Tax-Loss Harvesting (TLH) Is Reactive, Not Systematic 

Traditional tax-loss harvesting is opportunistic by nature. We believe it depends on short-term price declines in individual securities or market segments to generate tax losses. When markets rise steadily (as they often do over long time horizons), the opportunities to harvest losses may become infrequent and limited in magnitude. ³ 

This “wait for the dip” approach can create gaps in tax efficiency, especially during up years when investors might still be realizing gains from rebalancing, option exercises, or private investment liquidity events. Without a consistent source of offsetting losses, tax liabilities can accumulate.³ 

Losses Are Limited to the Long Side 

Most tax-loss harvesting strategies operate within long-only portfolios, whether in mutual funds, ETFs, or direct indexing structures. These portfolios can only generate losses when prices decline. However, no losses are available on the short side, because the strategy does not hold short positions at all. 

This creates a natural constraint: if markets trend upward or experience low volatility, loss harvesting opportunities are simply unavailable. The portfolio may continue to track an index or strategy benchmark, but the tax benefit becomes passive or dormant during those periods. ¹ 

Wash-Sale Rules Complicate Execution 

Tax-loss harvesting must be executed in compliance with the IRS’s wash-sale rule, which disallows a loss if the same or substantially identical security is purchased within 30 days before or after the sale. ² 

While this rule is well understood in concept, its practical implementation is complex, especially when an investor holds multiple accounts across custodians, or uses a combination of direct indexing, ETFs, and separately managed accounts. 

Even unintentional wash sales can invalidate losses and increase audit risk. Effective coordination between managers, custodians, and advisors is essential, but not always feasible. 

TLH Offsets Gains, But Timing Remains a Challenge 

Another key limitation is that traditional tax-loss harvesting harvests losses but it is difficult to predict when those losses will occur. While this may sound like a subtle distinction, it has real impact: investors using tax-loss harvesting still need to carefully time the realization of gains, often waiting for offsetting losses or donating appreciated stock to reduce exposure. ³ 

By contrast, tax-aware strategies that actively generate losses and manage realized gains through portfolio structure and deferral techniques can offer more consistent long-term benefits. In that context, we believe tax-loss harvesting may serve as one part of a broader tax-aware framework, but not a complete solution. ³ 

When TLH Falls Short 

We believe traditional tax-loss harvesting may not be sufficient for investors who: 

• Hold large low-cost-basis positions (from IPOs, inheritance, or long-term holdings). 

• Regularly realize gains from private investments or real estate sales. 

• Experience uneven cash flow needs or have multi-year tax planning horizons. 

• Want consistent tax management regardless of market direction. 

For these investors, more proactive, market-independent strategies may be appropriate, such as tax-aware long/short overlays, which can harvest losses across long and short positions, regardless of whether markets are rising or falling. These strategies may also allow gains to be deferred while tracking an investor’s desired benchmark. ³ ⁴ 

Conclusion 

Tax-loss harvesting remains a useful tactic, but it is important to understand its limitations, particularly for high-income investors and complex portfolios. By design, traditional tax-loss harvesting depends on market declines, applies only to long positions, and introduces coordination challenges that can diminish its effectiveness. 

If your current tax strategy relies solely on long-only tax-loss harvesting, it may be time to explore more structured approaches. Proactive tax management strategies, such as market-neutral overlays, may help generate consistent loss harvesting, reduce exposure to concentrated positions, and improve after-tax outcomes over time. 

At IEQ Capital, we help clients design and implement tax-aware investment strategies tailored to their long-term goals. Our experience includes evaluating overlay structures and other advanced techniques to complement traditional tax planning and asset allocation.  

We invite you to connect with our investment team to explore how tax-aware strategies, including long/short overlays, may complement your existing portfolio and support more consistent, long-term tax management.  

Sources 

1. Internal Revenue Code, Section 1211 – Limitations on capital losses. 

2. IRS Publication 550 – Investment Income and Expenses. 

3. IEQ Capital Internal Research and Portfolio Implementation Materials (2024–2025). 

4. Industry strategy design frameworks for tax-managed equity overlays. 

Disclosures 

Equities 

• Interest Rate Risk: Higher interest rates may adversely impact equity valuations. 

• Macro Risk: Macro factors including interest rates, inflation, or economic growth may lead to materially different return outcomes for the sector, particularly if there is a material impact to earnings outlooks. 

• Mark to Market Risk: Equities are relatively volatile securities and may be especially volatile in a poor macro backdrop. 

This document is for informational purposes only and is intended exclusively for the use of the persons to whom it is delivered and the information provided therein is confidential and may not be reproduced in its entirety or in part, or redistributed to any party in any form, without the prior written consent of IEQ Capital, LLC (“IEQ” or “IEQ Capital”). Information contained in this document is current only as of the date specified in the document, regardless of the time of delivery or of any investment, and IEQ does not undertake any duty to update the information set forth herein. The information contained in this document does not constitute an offer to sell or the solicitation of an offer to purchase or sell any securities, including any securities or alternative investments recommended by IEQ. Regarding alternative investments, any such offer or solicitation may be made only by means of the delivery of a confidential private offering memorandum which will contain material information not included herein regarding, among other things, information with respect to risks and potential conflicts of interest. No representation is made that any client will or is likely to achieve its objectives, that IEQ Capital’s strategies, investment process or risk management will be successful, or that any client will or is likely to achieve results comparable to any shown or will make any profit or will not suffer losses or loss of principal. Investing involves risks. You should not construe the contents of this document as legal, tax, investment or other advice. Any tax-related decisions should be made after conducting such investigations as the investor deems necessary and consulting the investor’s own legal, accounting and tax advisers to make an independent determination of the suitability and consequences of a composite election.