Your inherited mutual fund gets a "step-up" in cost basis to its value on the date of death

When you inherit a mutual fund, the IRS does not treat it the same way as a fund you bought yourself. Instead of inheriting the original owner's cost basis — the price they paid — you receive a stepped-up basis. This means your cost basis becomes the fund's market value on the date the person died, not what they paid for it years or decades earlier.

This matters because cost basis determines how much tax you owe when you eventually sell the fund. A stepped-up basis can eliminate or drastically reduce the tax bill you would otherwise face. If the original owner bought the fund for $10,000 and it was worth $50,000 when they died, your cost basis is $50,000, not $10,000. If you sell it immediately for $50,000, you owe no capital gains tax.

Key Takeaways

  • An inherited mutual fund receives a stepped-up cost basis equal to its market value on the date of death, not what the deceased paid for it.
  • You owe capital gains tax only on the growth that occurs after you inherit the fund, not on gains that happened before.
  • The executor or administrator of the estate should provide you with the stepped-up basis value; you will need this figure to report sales to the IRS.
  • If you inherit a fund in a taxable account, the step-up applies; funds in retirement accounts like IRAs follow different rules and do not receive this benefit.
  • Holding the fund for at least one year after inheritance qualifies any future gains as long-term capital gains, which have lower tax rates than short-term gains.

Why the step-up exists and who it benefits

The stepped-up basis rule exists because the IRS taxes the estate itself on unrealized gains at death. The estate pays tax on the difference between what the deceased paid and what the assets were worth when they died. Once that tax is settled, the heirs receive the assets without owing additional tax on the pre-death appreciation.

This rule benefits heirs most when the original owner held the fund for a long time and it grew significantly. Without the step-up, you would inherit a large embedded tax liability. With it, you start fresh. The downside is that this benefit only applies to assets held in taxable accounts — retirement accounts like traditional IRAs, Roth IRAs, and 401(k)s do not receive a stepped-up basis.

How to find the stepped-up basis value

The person managing the estate — the executor or administrator — is responsible for determining the stepped-up basis value. They typically hire an appraiser or use the fund company's records to establish the market value on the date of death. This value should appear on the estate's tax return (Form 1041) and in any documentation the estate provides to heirs.

Request this value in writing from the executor or estate attorney. You will need it to report the sale correctly to the IRS on your tax return. If you sell the fund without knowing the stepped-up basis, you risk overstating your cost basis (which means overpaying taxes) or understating it (which can trigger an audit). Keep the stepped-up basis documentation with your tax records for at least three years after you sell.

What happens when you sell the inherited fund

Once you own the fund, any growth from the date of death forward is yours to manage tax-wise. If the fund is worth $50,000 when you inherit it and $52,000 when you sell it six months later, you have a $2,000 short-term capital gain. You owe tax on that $2,000 at your ordinary income tax rate.

If you hold the fund for more than one year before selling, that $2,000 gain qualifies as a long-term capital gain, which is taxed at a lower rate (0%, 15%, or 20% depending on your income, versus your regular tax bracket). This is one reason many heirs hold inherited funds for at least a year — not only to let the market recover if it has dipped, but to lock in the tax advantage.

Stepped-up basis does not apply to retirement accounts

If you inherit a traditional IRA, Roth IRA, SEP-IRA, or 401(k), the stepped-up basis rule does not apply. These accounts are already tax-deferred or tax-free, and the IRS has different rules for inherited retirement accounts. You cannot simply take the balance and avoid taxes.

With a traditional IRA or 401(k), you must take distributions and pay income tax on them. With a Roth IRA, distributions are tax-free, but you still cannot treat the account as your own — you must follow inherited-account withdrawal rules. The rules changed in 2020 and again in 2023, so the timeline for emptying the account depends on when the original owner died and your relationship to them. Consult a tax professional or the account custodian for the specific rules that apply to your situation.

Reporting the sale on your tax return

When you sell an inherited mutual fund, report the transaction on Schedule D (Capital Gains and Losses) of your Form 1040. List the stepped-up basis as your cost basis, the sale price as the proceeds, and the difference as your gain or loss. If you held the fund for more than one year, mark it as a long-term gain.

The fund company will send you a 1099-B form showing the sale proceeds. This form may or may not show the correct cost basis — it depends on whether the fund company has access to the stepped-up basis documentation. If the 1099-B shows the wrong basis, you can correct it on your return by adjusting the cost basis figure you report. Keep your stepped-up basis documentation handy in case the IRS asks questions.

Frequently Asked Questions

Do I owe taxes on the inherited mutual fund just for receiving it?

No. You owe taxes only when you sell the fund or receive distributions from it. Inheriting the fund itself is not a taxable event. The estate may owe estate tax if the total estate exceeds the federal exemption (which varies by year), but that is separate from your personal income tax.

What if the fund lost value between when the person died and when I inherited it?

Your stepped-up basis is still the value on the date of death, not the value when you received the fund. If it was worth $50,000 on the date of death and $45,000 when you inherited it, your basis is $50,000. If you sell at $45,000, you have a $5,000 loss, which you can use to offset other capital gains.

Can I change the stepped-up basis value after I receive it?

No. The stepped-up basis is determined by the estate and reported on the estate's tax return. Once that return is filed, the basis is locked in. If you believe the value was wrong, the executor or estate attorney would need to amend the estate return, which is rare and requires strong evidence of valuation error.

What if I inherit a mutual fund that pays dividends before I sell it?

Dividends you receive after inheriting the fund are taxable income to you in the year you receive them. They are not covered by the stepped-up basis. Report them on your tax return as dividend income. This is different from the capital gains tax you owe when you eventually sell the fund.