When stocks, bonds, ETFs, or mutual funds are inherited in a taxable brokerage account or joint or separate revocable living trust, the beneficiary generally receives a “step up” in cost basis. A stepped up basis increases the value of the asset for tax purposes to the market value at the time of death.

When you sell the stock or asset, you’ll pay capital gains taxes on the difference between the step up cost basis and sale price. There’s no holding period requirement. In theory, you could sell it right away and still get a stepped up cost basis. In practice, the estate settlement process takes time. You’ll need to work with the financial institution to get everything properly retitled and the new cost basis applied.

https://darrowwealthmanagement.com/blog/step-up-in-basis-on-certain-inherited-assets/