What Is the Step-Up in Basis Rule and How Much Tax Does It Save on Inherited Stock?
The step-up in basis rule is one of the most valuable tax provisions most Americans have never heard of. When you inherit stocks, mutual funds, or a taxable brokerage account, the IRS automatically resets your cost basis to the fair market value on the date of death — wiping out all the capital gains that accumulated during the original owner’s lifetime. On $125,000 in inherited stock with an $81,000 embedded gain, that’s $12,000–$16,000 in federal taxes that simply disappear. Here’s the real dollar math, what qualifies and what doesn’t, and how to use this rule in your own estate planning.










