Tax-Free Portfolio Rebalancing with Inherited Investment Accounts

Inherited investments receive a step-up in basis—decades of gains are wiped clean for tax purposes. This creates a valuable window to rebalance or simplify your portfolio without triggering capital gains tax. Proper basis documentation is essential for this benefit.

Step-up basis is the headline benefit. The IRS resets the cost basis of inherited investments to their date-of-death value. Decades of accumulated gains are effectively erased for tax purposes. If your spouse bought stock for $10,000 thirty years ago and it was worth $200,000 when they passed, your new basis is $200,000 -- not a penny of that prior gain is taxable.

This creates a one-time window. You can sell and reallocate without paying capital gains tax on pre-death appreciation. Many advisors recommend using this moment to rebalance or simplify an overly complex portfolio, since the sales won't trigger a tax bill.

Verify the paperwork. Brokerage firms usually provide date-of-death valuation statements, but don't assume they actually updated the cost basis in their system. Check your first post-transfer statement carefully. Incorrect basis can cause you to overpay taxes for years.

The tradeoff: The step-up only applies to assets held at the time of death. Anything sold beforehand doesn't qualify. And once the basis resets, any new appreciation from that point forward is taxable normally when you eventually sell.