Portfolio Rebalancing for Wealthy Investors

Why rebalancing is different at $2M–$20M

The standard advice — "rebalance annually back to your target" — assumes you can sell and buy without consequence. For a 35-year-old with a $50K brokerage account, that's roughly true. For someone with $3M in appreciated stock-index funds, it's not.

At $2M–$20M, portfolio drift creates two competing problems:

• Let it drift: Your equity allocation climbs above target. In a sharp correction, you take more loss than your plan called for. The risk profile of your portfolio no longer matches your actual goals.
• Sell to rebalance: Selling appreciated positions in a taxable account triggers long-term capital gains. In 2026, the combined LTCG + NIIT rate reaches 23.8% for earners above $613,700 MFJ (20% LTCG rate per IRS Rev. Proc. 2025-32, plus 3.8% NIIT per IRC §1411 above $250,000 MFJ).¹

The solution is not "rebalance less" or "ignore the target." It's a set of techniques that bring your portfolio back to target with the lowest possible tax drag. Used together, they often eliminate the rebalancing tax bill entirely.

Estimate your rebalancing tax cost

Enter your portfolio details to see how much a full sell-to-rebalance would cost, how much the IRA/401(k) can absorb tax-free, and whether redirecting new contributions is a better path.

Four rebalancing methods — and what each costs you

Not all rebalancing triggers a tax bill. The right method depends on how much drift you have, how large your IRA/401(k) is relative to your taxable account, and how much you add to the portfolio each year.

Start with the IRA/401(k) — it's always free

The most overlooked rebalancing technique for $2M–$20M investors: sell the overweight asset inside your IRA or 401(k) and buy the underweight asset there. No capital gains tax is triggered — you're just moving money between funds inside a tax-deferred wrapper.

If your IRA holds $1.5M of a $5M portfolio and you need to move $300K from stocks to bonds overall, doing it entirely inside the IRA eliminates the tax problem. Your taxable account never changes — no gain, no tax bill, allocation back on target.

This works best when your IRA/401(k) is proportionally large (say, 30%+ of your total portfolio). It works less well when the overweight is larger than your IRA stock balance can absorb — at that point, you need the other methods.

Use new contributions as a steering mechanism

Every dollar of new savings, reinvested dividends, or employer match that you direct to the underweighted side of the portfolio moves your allocation without triggering a taxable event. For a $5M portfolio contributing $200K/year and drifted 10% from target (a $500K overweight), contribution redirection alone closes the gap in about 2.5 years.

This approach is slow but perfectly tax-efficient. The practical limit: if the drift is very large (20%+) or contributions are small relative to portfolio size, the window to close the gap through contributions alone becomes too long — meanwhile, you're carrying more equity risk than intended.

The calculator above tells you how many months this takes for your specific situation. If it's under 18 months, redirection is usually the right answer. Much longer and a hybrid approach — IRA rebalancing plus some contribution redirection, with selective taxable selling as a last resort — is more appropriate.

Treat all accounts as one portfolio

Most investors mentally separate "my IRA" from "my brokerage" and manage each to its own target. This is inefficient and usually more expensive. The right framework: one portfolio across all accounts, with each account holding whichever assets belong there from an asset location perspective.

In practice this means:

• Bonds, REITs, and high-dividend stocks → IRA/401(k). Their ordinary income is shielded. Rebalancing them inside the IRA is always free.
• Stock index funds → taxable brokerage. Qualified dividends are taxed at LTCG rates; positions can step up in basis at death under IRC §1014; and you can harvest losses at the individual-lot level.
• High-growth alternatives → Roth IRA. No RMDs, no tax on any future gain, fully accessible for rebalancing without tax cost.

When you're set up this way, the bonds you need to buy during a rebalancing event already live in the IRA — you're just changing their proportions there, not selling stocks in taxable. This structural decision, made once, dramatically reduces rebalancing tax friction for the rest of your investment life.

Tax-loss harvesting as a rebalancing offset

If you do need to sell appreciated stocks in taxable to complete a rebalancing, look first for losses elsewhere in the portfolio to offset those gains. A period of market volatility that pushes your equity allocation above target often also creates single-stock or sector losses you can harvest.

Harvested losses offset LTCG gains dollar-for-dollar. If you need to sell $300K in appreciated index funds at a 50% gain ($150K gain, $35,700 federal tax at 23.8%), but you can harvest $150K in losses from individual positions that underperformed, your net taxable gain is zero. The rebalancing is completed at zero additional tax cost.

This is exactly the kind of year-end coordination where a fee-only advisor earns their fee — modeling which lots to sell, which losses to harvest, and how to complete the rebalancing without an unexpected tax bill. See our tax-loss harvesting guide for the mechanics and wash-sale rules.

Lot selection: a lever most investors miss

When you do sell in a taxable account, which lots you sell matters enormously. The IRS allows you to specify which tax lots you're selling (specific identification method). You can choose the highest-basis lots — minimizing your realized gain — while leaving the lowest-basis, most-appreciated lots to either hold longer, step up at death, or donate to a donor-advised fund.

Example: you hold VTI across 8 lots purchased over 10 years. The most recent lot (2024, bought at $270) has a small gain. The oldest lot (2016, bought at $95) has a massive gain. If you sell only the 2024 lot to rebalance, you pay a small tax. The 2016 lot sits tax-deferred until death, donation, or a more favorable year for realization.

This requires tracking your lots carefully — your custodian can do this automatically if you set your cost basis method to "specific identification" — and coordinating which lots to sell across all your accounts simultaneously.

The donation strategy: remove the overweight, get a tax deduction

For investors with charitable intent, donating overweight appreciated securities to a donor-advised fund (DAF) achieves three things at once: it reduces the overweight, eliminates the capital gains that would result from selling, and generates a charitable deduction at the full fair market value (subject to OBBBA's 0.5% AGI floor and 35% deduction cap for certain charitable giving).²

At $5M with a $50K charitable giving budget, donating $50K of your most appreciated stock accomplishes more rebalancing than selling $50K would — because the full $50K leaves the portfolio rather than $50K minus the $11,900 tax you'd have paid on the gain.

See our charitable giving and DAF guide for the mechanics, AGI limits, and how to coordinate with your estate plan.

When to actually pay the tax and rebalance immediately

For all the tax-efficiency techniques above, there are situations where paying the capital gains tax is still the right call:

• Severe drift (>20% from target). If a bull market has pushed a 60/40 portfolio to 80/20, the sequence-of-returns risk from a correction exceeds the tax cost of rebalancing. Pay the tax.
• Approaching retirement. If you're 3–5 years from drawing on the portfolio, correcting a large equity overweight is more urgent. A 30% equity correction on an 80/20 portfolio is more damaging than the tax bill from rebalancing back to 60/40.
• Tax rate arbitrage. If you're in a lower-income year (business sold, sabbatical, first year of retirement), your LTCG rate may be 15% instead of 23.8% — a significant discount on the tax cost of rebalancing now.
• Estate planning coordination. Realizing gains in a year where losses, deductions, or charitable contributions can offset them may be better than deferring to death — if your estate plan doesn't feature a full step-up in basis for your taxable account.

Why this is hard to do alone at $2M+

The individual techniques above are each understandable. Executing all of them simultaneously across a $5M–$10M portfolio — with multiple taxable accounts, IRAs, a Roth, possibly a 401(k), and a spouse's accounts — is where things break down without professional coordination:

• Wash-sale rule applies across all accounts, including IRAs and your spouse's accounts. Harvesting a loss in taxable while the IRA buys the same fund during rebalancing can disallow the loss.³
• Roth conversion planning and rebalancing interact: rebalancing gains inside the IRA don't trigger tax, but moving assets out (via conversion) in the same year they've been rebalanced affects the conversion cost.
• Specific identification requires lot-level tracking across every account. Custodians vary in how they handle this; errors mean you accidentally sell the lowest-basis lots first.
• Charitable donations of appreciated stock require coordination with your DAF, your estate attorney, and the tax year — not a same-day transaction.

A fee-only fiduciary advisor who treats your entire household as one portfolio — not just the account custodied with them — earns their fee primarily through decisions like this. The difference between a tax-efficient rebalance and a careless one on a $5M portfolio runs $30,000–$80,000 per rebalancing cycle. See our fee-only vs. AUM guide for the full cost comparison.

Get matched with a tax-efficient rebalancing specialist

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