Latest / The High Net Worth Podcast with Fexingo: Wealth Management, Tax Strategy, and Affluent Finance / How Ultra-Wealthy Families Use Direct Indexing for Tax Alpha
Transcript
- Lucas: There's a number circulating in wealth management circles right now that I think is worth anchoring this conversation on. As of mid-2026, assets in direct-indexing strategies globally have crossed half a trillion dollars. That's up from about three hundred billion just two years ago. Luna: Half a trillion in what is essentially a tax-optimization wrapper for passive investing. That's not niche anymore. Lucas: It's not. And I think for a lot of our listeners — high-net-worth families, family office executives — direct indexing is one of those tools that sounds a bit like financial engineering until you look at the numbers. So today I want to walk through exactly how it works, with a concrete example, and then talk about where it breaks down. Luna: Before we go deep — you know, conversations like this are exactly why people tell us they value the show. We keep it ad-free and focused on the mechanics, not the hype. If you find these strategy breakdowns useful, the best way to keep them coming is a small contribution at buy me a coffee dot com slash fexingo. That's it — no tiers, no perks, just helping us stay independent. Lucas: And we really appreciate that. So, direct indexing. Let's define it. Instead of buying an S&P 500 ETF — one ticker, one trade — you buy the individual stocks that make up the index, in their proper weights. You literally own each company. Luna: So instead of holding an ETF that tracks the index, you hold a basket of the actual stocks. That gives you control over which lots you sell and when. Lucas: Exactly. And that control is where the tax alpha comes from. With an ETF, if the market goes up and you sell, you realize capital gains on the whole position. With direct indexing, you can sell specific lots that have losses — even if the overall portfolio is up — and use those losses to offset gains elsewhere in your portfolio. Luna: So you're harvesting losses systematically. I've seen some white papers claiming you can generate an extra one to two percent per year in after-tax returns just from this. Lucas: Right, and the key word there is 'after-tax.' That's tax alpha. Let me give you a concrete case. Say a family has a twenty-million-dollar portfolio, ten million of it in a direct-indexed S&P 500 mandate. In a typical year, even if the index is up eight percent, there will be individual stocks down five, ten, fifteen percent. A good manager can harvest those losses — maybe two to three hundred thousand dollars in realized losses annually. Luna: And those losses can offset capital gains from other parts of the portfolio — a business sale, real estate, maybe a concentrated stock position they've been unwinding. Lucas: That's the play. If the family has a realized gain of five hundred thousand from selling a rental property, the harvested losses from the direct-indexed portfolio can shelter a portion of that gain. At the top federal capital gains rate of twenty-three point eight percent — including the net investment income tax — that's over seventy thousand dollars in tax savings from that single year's harvesting. Luna: And it compounds. Because you're not just saving tax once — you're deferring the gains on those sold losers by reinvesting the proceeds. So the portfolio can grow on a tax-deferred basis. Lucas: Right. But here's the catch — and I want to be careful not to oversell this. Direct indexing works best when the portfolio is large enough that the complexity pays off. A one-million-dollar account probably doesn't justify the management fees and the trading costs. The industry rule of thumb is a minimum of five hundred thousand to a million, but the real benefits start showing above two or three million. Luna: And the trade-off is that you're no longer truly passive. You're managing a portfolio of hundreds of individual stocks. You need a manager — often a firm like Parametric, or a family office with its own trading desk — to handle the rebalancing and tax-loss harvesting algorithms. Lucas: That's the piece that doesn't get enough attention. The rebalancing complexity is real. When a stock in the index goes up and its weight increases, you need to trim it. When another stock drops, you need to buy more to maintain the weight. That creates taxable events. The algorithm has to balance tracking error against tax efficiency. It's not a set-it-and-forget-it strategy. Luna: So you're essentially paying for active management to mimic a passive index — but with a tax overlay. The fees are higher than an ETF. Typically fifty to seventy basis points for direct indexing versus three to ten for an ETF. Lucas: And that fee is justified only if the tax alpha exceeds the fee. For a high-net-worth family in a high-tax state, the math can work. But for someone in a lower tax bracket or with a smaller portfolio, it probably doesn't. Luna: Let's talk about the customization angle, because that's another selling point. With direct indexing, you can exclude certain stocks. If a family doesn't want to own tobacco or oil companies for ethical reasons, they can build a customized index that omits those stocks. Lucas: That's a big draw for families with values-based investing mandates. You can also tilt toward factors — value, momentum, quality — by overweighting certain stocks within the index. So you're not just tracking the S&P 500; you're creating a personalized version of it. Luna: But that customization introduces tracking error. If you exclude a sector that outperforms, your returns will deviate. And the more customization, the harder it is to harvest losses efficiently because you have a smaller universe of stocks to work with. Lucas: That's a really important point. The tax-loss harvesting engine works best when you have many stocks to choose from. If you exclude an entire sector, you reduce the pool of potential losers to harvest. There's a trade-off between customization and tax alpha. Luna: So what's the typical implementation for a family office? Do they use an external manager or build in-house? I've seen both. Lucas: It depends on the size. A family office with a billion in assets might build its own direct-indexing capability — hire a team, buy the trading software. But for most families in the ten to one hundred million range, it makes more sense to hire a specialist. Parametric, Aperio, BlackRock's model-based portfolios — these firms have the infrastructure. Luna: And you need to integrate it with the rest of the portfolio. If the family also owns a concentrated stock position — say, ten million in Apple from a company sale — the direct-indexed portfolio should be managed around that concentration risk. You wouldn't want to also overweight tech through the index. Lucas: Absolutely. Holistic tax management is the goal. The direct-indexed portfolio is one tool in a broader strategy that might include charitable trusts, donor-advised funds, and installment sales. The losses harvested can be used to offset gains from any of those. Luna: Let's talk about the downside scenarios. What happens in a bear market? If the whole market drops, most stocks are down, so you can harvest massive losses. But then you also have less ability to use those losses if you don't have gains to offset. Lucas: Right, and losses can be carried forward indefinitely, but they're only valuable if you have future gains. In a prolonged downturn, you might harvest losses that sit unused for years. But over a full market cycle, most families will have gains from rebalancing, from selling a business, from real estate. The losses eventually get used. Luna: One more risk: wash sale rules. If you sell a stock at a loss and buy it back within thirty days, the loss is disallowed. In direct indexing, the algorithm has to avoid buying back the same stock too quickly. That can cause tracking error if the stock rallies. Lucas: That's why the algorithms use substitution — they might buy a different stock with similar characteristics to maintain the sector exposure while staying out of the wash-sale window. So if you sell a Microsoft loss, you might buy Oracle for thirty days, then switch back. It's not perfect, but it manages the trade-off. Luna: I want to come back to the threshold question. At what portfolio size does direct indexing start to make sense? I've heard five hundred thousand, but I think that's too low. Lucas: I agree. At five hundred thousand, the annual tax savings might be fifteen thousand dollars — maybe. The fees would be around three thousand. So net benefit of twelve thousand. That's real money, but the complexity and the time might not be worth it. I think the sweet spot is two to five million. At that level, the tax alpha can be fifty to one hundred thousand a year, and the fees are still manageable. Luna: And for families above twenty million, it's almost a no-brainer — as long as they have a reliable manager and a plan to use the losses. Lucas: Exactly. The other consideration is the capital gains rate environment. If rates go up, the value of tax loss harvesting goes up. If they go down, it's less valuable. Right now, with rates historically moderate but likely to rise, the strategy seems well-positioned. Luna: So to sum up: direct indexing is a way to own the index while customizing it and harvesting tax losses. It's not passive, but it can deliver significant after-tax returns for large portfolios. The key trade-offs are fees, complexity, and tracking error. Lucas: And it's a tool — not a solution. It works best when integrated with a family's overall tax and estate plan. Used well, it can add years of compound growth by keeping more money invested. Used poorly, it's just expensive complexity. Luna: It's one of those strategies that sounds like magic until you look under the hood. But for the right family, with the right scale, it's a legitimate source of tax alpha. Lucas: And that's the kind of tool that keeps wealth management interesting. I'm Lucas. Luna: And I'm Luna. Thanks for listening.