Can You Diversify Without a Big Capital Gains Tax Bill?

Suppose your investments have done well. A stock or fund you bought years ago is now worth far more than you paid. You want to diversify, but the moment you sell, you may owe capital gains tax. Do you sell anyway, take smaller steps, or use a tax strategy to keep more invested?

The useful question is not simply, “How can I avoid tax?” It is, “How much risk am I taking to postpone the tax?” That is where this story becomes a real investment decision rather than just an IRS headline.

1. Why a successful investment can become a tax problem

In a taxable brokerage account, a gain generally becomes taxable when you sell an appreciated investment. The difference between the proceeds and your adjusted cost basis is usually the realized gain. Holding an appreciated investment without selling generally means the gain remains unrealized. The holding period and your overall taxable income affect how gains are taxed.²

Terra model, not your tax estimate: $200,000 − $60,000 = $140,000, and 15% × $140,000 = $21,000. This assumes a single long-term capital gain entirely taxed at 15%, with no losses or other adjustments. It excludes state taxes, the possible 3.8% net investment income tax, changing capital-gain brackets, and any Medicare premium effects. Actual federal capital gains rates can be 0%, 15% or 20% for many investments, depending on the taxpayer's circumstances.²³

A $21,000 tax bill is significant. But if this $200,000 position is an outsized share of your wealth, a decline in that investment could create a much larger loss. That is why tax cost must be weighed alongside concentration and market risk.

2. What the new IRS ETF ruling actually says

The ruling addresses an investor who contributes appreciated securities to a newly formed exchange-traded fund (ETF). As part of the same plan, an authorized participant supplies other assets to the ETF and redeems ETF shares for some or all of the investor's contributed securities. The end result resembles exchanging the investor's original portfolio for a different portfolio inside the ETF.

The IRS treated the investor as making a taxable exchange under Internal Revenue Code Section 1001 with the authorized participant, to the extent the securities were used in the planned redemption, rather than receiving the intended Section 351 tax-free treatment.¹

For most households, a complex ETF conversion is not the first option to consider. The more useful step is to compare simpler alternatives before entering a structure with additional transaction, tax, legal and liquidity risks.

3. Five practical ways to approach appreciated holdings

1. Sell and diversify now.You realize gains and may owe tax, but you can promptly reduce a concentrated exposure. This can make sense when the current holding no longer fits your risk tolerance, near-term cash needs or retirement plans.
2. Sell in stages.Spreading realized gains across tax years can provide more control over annual taxable income. It may or may not reduce the total tax. You remain exposed to the unsold investment, and its price may change.
3. Use eligible capital losses.Realized losses on other investments can offset realized capital gains under applicable netting rules. If you harvest losses, follow wash-sale restrictions: reacquiring substantially identical securities in the 30 days before or after a loss sale may disallow the current deduction.⁴
4. Choose which tax lots to sell.If the same security was purchased at different prices and dates, properly identifying higher-basis shares may reduce the gain recognized on a partial sale. Instructions to your broker and adequate records matter. The default when shares cannot be adequately identified generally is first-in, first-out.⁵
5. Donate appreciated securities when giving was already planned.For eligible long-term holdings donated directly to qualifying charities, special rules may allow avoidance of a sale-generated gain and a deduction, subject to limits and other conditions. This is a charitable decision first, not a way to keep the asset for yourself.⁶

Specialized exchange-fund or ETF-contribution arrangements can be appropriate for certain investors, but they involve legal requirements and tradeoffs that ordinary examples cannot capture. Seek independent, transaction-specific tax advice before treating such an arrangement as tax-free.

4. Terra comparison: selling now versus four annual sales

Keep the same $200,000 investment with $60,000 in basis and $140,000 of unrealized gain. Assume its value and basis allocation do not change and that all realized gains are subject to the same illustrative 15% federal tax rate each year.

In this deliberately fixed-price example, staging sales does not save a dollar of tax; it merely changes when taxes are realized. Any genuine saving would come from different tax brackets, other income, loss offsets or related circumstances. Real portfolio values and taxes rarely remain fixed for four years, and capital gains can also increase income-based costs.

5. The overlooked costs: NIIT and Medicare premiums

For some higher-income investors, realized gains may be subject to the additional 3.8% net investment income tax (NIIT). For individuals, the tax generally applies to the lesser of net investment income or modified adjusted gross income above a threshold, including $250,000 for married taxpayers filing jointly and $200,000 for single filers. That does not mean every gain is automatically taxed at an additional 3.8%.³

For people on Medicare, gains can also raise modified adjusted gross income used to determine the income-related monthly adjustment amount (IRMAA) for Part B and Part D premiums. Medicare generally looks at federal tax information from two years earlier. For instance, gains realized in 2026 can affect premiums assessed for 2028 under the usual lookback—not necessarily the year of the sale.⁷

That is particularly important near retirement, when pensions, IRA withdrawals, investment gains and Social Security benefits may overlap. It is one reason to model the whole tax picture, rather than looking at a single capital-gains rate.

6. What changes if someone manages your taxable portfolio?

In an actively managed taxable account, the manager may sell appreciated investments even when you never withdraw money. Those trades can produce taxable realized gains. Dividends and distributions can also create taxable income. The manager's pre-tax return is not necessarily your after-tax result.

Ask for a year-by-year realized-gain report, not just a performance statement. Specifically, ask:

1. What realized gains have we generated?Separate short-term from long-term gains, show losses, and explain how much turnover was required for risk or strategy reasons.
2. Are tax lots selected deliberately?Confirm how the team evaluates higher-basis lots, gains that can be deferred, and loss opportunities when consistent with your allocation.
3. What might happen to our income thresholds?Coordinate the sale calendar with taxable retirement withdrawals, pensions, charitable giving and potential Medicare IRMAA effects.
4. What am I receiving after taxes and fees?Evaluate risk-adjusted, after-tax results rather than assuming that fewer realized gains or higher pre-tax returns automatically wins.

7. A useful decision order before trading

Then decide how quickly the portfolio needs to change, which assets and tax lots to sell, whether losses are available, and which income thresholds deserve attention. A tax professional can help evaluate the consequences of an unusually large realization or a proposed tax-deferral transaction.

Primary sources

1. IRS — Internal Revenue Bulletin 2026-43 (October 19, 2026). Revenue Ruling 2026-20 and Notice 2026-62 describe the specific ETF-related tax treatment and transactions under review. Read IRS bulletin.
2. IRS — Topic No. 409: Capital Gains and Losses. Basis, holding periods, net gains and common rates. Read IRS guide.
3. IRS — Net Investment Income Tax. The 3.8% tax and its applicable income thresholds. Read NIIT rules.
4. IRS — Instructions for Schedule D (Form 1040). Wash-sale restrictions when realizing capital losses. Read Schedule D instructions.
5. IRS — Stocks (options, splits, traders): Cost basis FAQ. Adequate share identification versus first-in, first-out. Read IRS FAQ.
6. IRS — Charitable contribution deductions. Appreciated property and circumstances in which deductions may be limited. Read charitable rules.
7. Social Security Administration — IRMAA modified adjusted gross income policy. Medicare premium determination and the usual two-year lookback. Read SSA policy.

Keep going

Terra illustrations are hypothetical, not investment forecasts or individualized tax estimates. The new IRS ruling concerns a specific set of prearranged transactions; interpretations and guidance may evolve. Terra provides general financial education, not individualized investment, tax or legal advice.

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