The Hidden Costs of Direct Indexing

For a subset of investors, it can be a powerful tool. For many others, the trade-offs are less obvious and often underappreciated.

Before adopting the strategy, it's worth understanding where complexity, cost, and long-term constraints begin to show up.

1. Tax-Loss Harvesting Comes with Substitution Risk

At the core of direct indexing is tax-loss harvesting : selling a position at a loss and replacing it with a similar security to maintain market exposure.

In theory, this is efficient. In practice, it introduces a subtle but persistent risk.

When you sell one company and replace it with another, you are no longer holding the same asset, even if they appear similar on the surface. Differences in management, capital allocation, sector exposure, and valuation can lead to materially different outcomes over time.

Individually, these substitutions may seem insignificant. But compounded across hundreds of trades and multiple years, they can introduce meaningful divergence from the index. At a broad level, selling Apple and buying Microsoft may feel neutral. But these companies have vastly different growth trajectories, AI exposure, capital return policies, and valuation multiples. Every single swap introduces a bet you didn't knowingly make. Multiply that across hundreds of stocks and several years, and you have a portfolio whose performance can diverge substantially from the index it was designed to replicate.

This is often referred to as tracking error which is the gap between the portfolio you intended to own and the one you actually end up with.

The more aggressive the harvesting, the greater the potential drift.

2. Complexity Compounds Over Time

Direct indexing portfolios naturally evolve into hundreds of individual positions, each with its own cost basis and tax history.

This is manageable while the strategy is running. It becomes more challenging when circumstances change.

Over time, portfolios can accumulate:

• Large embedded gains across many positions
• Multiple tax lots per security
• A structure that is difficult to unwind without tax impact

This matters because financial plans rarely remain static. Liquidity needs, advisor changes, estate planning, or geographic moves can all require portfolio adjustments. Unlike an ETF, which can be exited in a single transaction, a direct indexing portfolio often requires a staged, multi-year transition to manage taxes efficiently.

That complexity is rarely visible at the outset, but becomes very real at exit.

3. The Tax Benefit Is Front-Loaded

Tax-loss harvesting is most effective when positions are newly established. In the early years, there are ample opportunities to realize losses and generate tax offsets. Over time, however, as markets rise and positions appreciate, those opportunities decline.

Eventually, a large portion of the portfolio may consist of low-cost-basis holdings with significant unrealized gains, leaving little left to harvest.

This creates an asymmetry:

• Tax benefits tend to diminish over time
• Fees remain constant

Direct indexing strategies often carry fees in the range of ~0.20%–0.40%, compared to index ETFs that can cost ~0.03%. That difference compounds annually, even as the incremental tax benefit declines.

4. The Key Question: Does It Outperform After Taxes and Fees?

The right way to evaluate direct indexing is not by its features, but by its outcomes.

After accounting for:

• Ongoing fees
• Tracking error from substitutions
• Operational complexity
• The declining marginal benefit of tax-loss harvesting

…the key question becomes: Does the strategy deliver superior after-tax, after-fee returns over a full investment horizon?

For certain high-income investors with complex tax situations, the answer can be yes. For many others, the advantage is less clear, especially when compared to a low-cost, tax-efficient index ETF held over time.

Final Thoughts

For many investors, simplicity remains a powerful advantage.

A low-cost index ETF implemented thoughtfully and held consistently continues to be one of the most reliable ways to compound wealth efficiently over the long term.