Concentrated Stock · Low Basis

How to Sell Concentrated Stock Without Getting Crushed by Taxes

A large, low-basis position — founder shares, RSUs, an inherited holding, decades of a single stock — is a tax trap. A 1031 exchange can't help (that's for real estate). Here are the strategies that actually work.

You're holding too much of one stock. Maybe it's founder or employer equity, RSUs that vested, an inherited position, or a single name you've owned for 30 years. Selling means a giant capital gain; holding means dangerous concentration risk. And unlike real estate, a 1031 exchange does nothing for stock. Here are the real options.

Why this is hard

A low-basis position means most of the value is unrealized gain. Sell it all at once and you stack the 20% federal rate, the 3.8% NIIT, and (in California) up to 13.3% state — roughly a third gone — plus you may spike into the top bracket and trigger IRMAA. The goal is to diversify or exit without detonating all of that in one year.

The main strategies

Quick fit guide:
  • Want to fully exit and spread the tax → structured installment sale
  • Want to stay invested but diversified, and meet the minimums → exchange fund
  • Charitable goal + lifetime income → charitable remainder trust

Why a structured installment sale fits most sellers

Exchange funds have high minimums and a 7-year lockup; CRTs are irrevocable and charitable. For someone who simply wants to sell the position and stop sending a third of it to the government in one year, a §453 structured installment sale spreads the gain across years with payments backed by an A-rated carrier — no minimums to qualify, no replacement asset to find.

Frequently asked questions

Can I use a 1031 exchange to defer taxes on stock?

No. A 1031 exchange only applies to like-kind real property. For appreciated stock, you need other strategies such as a structured installment sale, an exchange fund, or a charitable remainder trust.

How do I sell a concentrated stock position without a huge tax bill?

Spread the sale over years with a §453 structured installment sale, contribute to an exchange fund for tax-deferred diversification, or use a charitable remainder trust. Each defers or reduces the one-year tax hit in a different way.

What is an exchange fund and what are the requirements?

An exchange fund lets you contribute appreciated stock into a diversified pool without a taxable sale under §721. It typically requires around a $5 million minimum / qualified-purchaser status and a roughly 7-year holding period.

How does a structured installment sale work for stock?

You sell the position but receive the proceeds over a schedule of future years, paying tax on the gain only as you receive it. This keeps more of the gain in lower brackets and can reduce the 3.8% NIIT — and unlike an exchange fund, there's no minimum to qualify.

Which option is best for selling low-basis stock?

It depends on your goal: a structured installment sale if you want to fully exit and spread the tax, an exchange fund if you want to stay invested but diversified and meet the minimums, or a charitable remainder trust if you have a charitable goal and want lifetime income.

Thinking about a big sale?

Before you sign anything, run your numbers with someone who structures the deal to be tax-smart and audit-ready from day one.

Call 213-414-2808 Run the Numbers →