The Tax Break That Could Erase Your Biggest Capital Gain

Imagine you bought a stock 20 years ago for $50,000. Today it is worth $500,000. You have a $450,000 gain and you are thinking about what to do with it. Most people assume they have two options: sell and pay the tax, or hold and feel uncomfortable about the exposure.

There is a third option. Hold it strategically, work around it for income if needed, and eventually pass it to your heirs as part of your estate. When you do, the entire capital gain disappears permanently. Not deferred. Gone.

How the step-up in basis works

Your cost basis is the price you originally paid for an investment. When you sell, you owe tax on the difference between the sale price and your basis.

When you pass away and leave an investment to an heir, the IRS resets the cost basis to the fair market value on the date of your death. The old basis disappears. Your heir inherits the investment as if they purchased it at today's price.

Using the example above: you bought stock for $50,000 and it is worth $500,000 at your death. Your heir receives it with a new basis of $500,000. They sell it the next day for $500,000. Capital gains tax owed: zero. The $450,000 gain you spent years carrying is permanently wiped out.

This is one of the most powerful and underused tax advantages in the entire tax code, and it is available to anyone who holds appreciated assets in a taxable brokerage account.

The cost of selling versus holding

Let's make the comparison concrete. You hold a position worth $500,000 with an original cost basis of $50,000.

If you sell today, your taxable gain is $450,000. At the federal long-term capital gains rate of 20% plus the 3.8% net investment income tax, you owe roughly $107,100 in federal taxes before any state taxes. You walk away with about $392,900 to reinvest.

If you hold the position and pass it to your heirs, they receive it with a stepped-up basis equal to the value at your death. If the position is worth $500,000 at that point, they sell it for $500,000 with a basis of $500,000. Their capital gains tax is zero. The full $500,000 transfers, and the $107,000 tax bill never existed.

That is a meaningful difference. And if the position continues to grow before you pass, the benefit compounds further.

What to do if you need income or want to diversify

The most common objection is that people feel stuck. They do not want to pay the tax but they also need income, want to rebalance, or feel overexposed to a single stock. There are several ways to work around a large gain without triggering it.

• Securities-backed lending. You can borrow against appreciated stock without selling it. No sale means no taxable event, and you access liquidity while keeping the position intact. This works best for stable, diversified holdings rather than a single volatile stock.

• Donor-advised fund. If you give to charity, contributing appreciated shares directly lets you take a deduction for the full market value. The fund sells the shares with no capital gains tax, and you never pay the gain. You can then recommend grants to the charities of your choice over time.

• Charitable remainder trust. A CRT lets you contribute appreciated assets, receive an income stream for life or a term of years, and get a partial charitable deduction today. The trust sells the asset with no immediate capital gains tax, and the gain is spread across your income payments over time.

• Gifting to lower-income family members. Heirs in the 0% or 15% long-term capital gains bracket can sell at a lower rate than you would pay. For some families, gifting shares during your lifetime is more efficient than waiting for the step-up.

• Tax-loss harvesting to offset a partial sale. If other positions in your portfolio are sitting at a loss, harvesting those losses can offset gains from a partial sale, letting you trim the position over time without a full tax hit each year.

One important limitation

The step-up in basis applies to assets held in taxable accounts, such as brokerage accounts and joint accounts. It does not apply to pre-tax retirement accounts like IRAs and 401(k)s. Those accounts are taxed as ordinary income when your heirs withdraw them regardless of when you pass. If most of your wealth is in retirement accounts, this strategy does not apply in the same way.

For those who do hold appreciated assets in taxable accounts, the step-up is worth understanding before making any decision to sell. In many cases, the right answer is not to sell at all.

 - Steve Balch, CFP®

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