How to Diversify RSUs Without a Tax Catastrophe

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

For a California tech professional with a concentrated RSU position, compare the tax impact of selling in one year with a staged plan across several years, and include any new RSU vests in each year's estimate. California taxes capital gains as ordinary income, so the tax depends on the gains recognized and total income in each year. Staging can spread gains across tax years, but it does not erase tax and leaves the shares exposed to market risk while you wait. Model that trade-off before selling.

She's a senior director of product at a publicly traded tech company. Nine years in. The RSUs that felt like a bonus early on have quietly stacked into more than $2 million in a single stock. She knows the concentration is a risk she would never take if she had that much in cash. But every time she runs the numbers on selling, the tax bill stops her. As we have covered before, RSUs reshape your entire tax picture in ways a once-a-year preparer does not look for.

That feeling, being trapped by the very asset that made you wealthy, is common among tech executives holding large RSU positions. The good news is that diversifying a concentrated stock position without triggering a tax catastrophe is possible. It just requires a plan that runs across several years rather than a single trade.

Related reading on tax planning for tech executives: Your RSUs After a Layoff: Tax Deadlines You Can't Miss.

Why RSUs Create a Diversification Problem That Cash Bonuses Don't

RSUs are taxed in two stages. At vesting, the full market value of the shares is treated as ordinary income. Your employer withholds 22% for federal taxes on that amount — the supplemental wage rate — but for a senior director in the 35% bracket with California's 10.3% or higher, that withholding falls well short. The shares then sit in your account, and any appreciation after the vesting date is a capital gain when you eventually sell.

This two-stage tax means you cannot sell everything at once without creating a large, concentrated tax year. Selling $500,000 in appreciated shares might push you over the net investment income tax threshold, phase out your QBI deduction, or trigger the 3.8% surtax on top of capital gains rates. Earlier we covered why that 3.8% tax surprises so many sellers.

The solution is not to avoid selling. It is to sell on a schedule that keeps each year's tax impact manageable.

The Multi-Year Sell-Down Plan Using a 10b5-1 Plan

A 10b5-1 trading plan is the most straightforward tool for diversifying RSUs. You set up a plan with your broker that automatically sells a predetermined number of shares on a predetermined schedule. The plan removes insider trading concerns because the trades are pre-committed and not based on inside information.

The real advantage for tax purposes is spreading the sales across multiple tax years. If you sell one-third of the position each year for three years, each year's capital gain sits in a lower bracket. You stay under the NIIT threshold of $250,000 (married filing jointly) in more years. You preserve your QBI deduction if you have pass-through income. And you keep the alternative minimum tax from hitting as hard.

A well-designed 10b5-1 plan also lets you vary the sell price. You can set limit orders within the plan that only execute above a certain price, so you capture upside while still reducing the position over time.

Gifting Appreciated Shares Instead of Selling

If charitable giving is part of your financial life, donating shares directly from your concentrated position is one of the most tax-efficient moves available. When you donate appreciated shares held for more than a year to a donor-advised fund or public charity, you avoid the capital gains tax on the appreciation entirely. You also get a charitable deduction for the full fair market value, up to 30% of your adjusted gross income.

The strategy works particularly well for tech executives who give regularly. Instead of writing a check from cash, you donate shares. The charity or DAF sells them tax-free, and you replace the shares in your portfolio with diversified holdings using cash you would have donated anyway.

For a deeper walkthrough on the mechanics, see our guide on donating restricted stock to charity.

We go deeper into concentrated stock tax strategy in One Stock Is Most of Your Net Worth: Where the Tax Conversation Starts.

Exchange Funds: Diversification Without a Taxable Sale

An exchange fund — sometimes called a swap fund — allows you to contribute your concentrated stock into a pooled fund alongside other investors doing the same. Under Section 721 of the tax code, the contribution is not a taxable event. You receive a diversified interest in the fund without selling your shares.

The appeal is immediate diversification with no tax. The trade-offs are real. Exchange funds typically require a minimum investment of $1 million or more. You give up control over when to exit the fund. Lock-up periods run five to seven years. And the fund charges management fees that eat into returns. For some executives, the liquidity sacrifice is worth it. For others, a multi-year 10b5-1 plan achieves the same outcome with more control.

When Borrowing Against RSUs Makes Sense (and When It Doesn't)

A securities-backed line of credit lets you borrow against your vested shares without selling them. You get cash for a home purchase, a business investment, or a large expense. The loan is not a taxable event. You pay interest instead of capital gains tax.

This strategy works best for a specific scenario: a one-time liquidity need that you can repay within a few years. It is not a diversification strategy on its own. The concentrated position remains concentrated while you pay interest on borrowed money. The line of credit can also be called by the lender if the stock price drops sharply, forcing you to sell into a downturn or add collateral.

For most executives, an SBLOC works as a tactical tool inside a broader plan rather than the plan itself.

Putting the Pieces Together: A Realistic Multi-Year Sequence

The most effective approach combines several strategies across a timeline. Here is how it can look for a senior tech executive in California holding $2.5 million in their employer's stock.

Year one: Set up a 10b5-1 plan that sells $200,000 worth of shares. Gift $50,000 in shares to a donor-advised fund. The sale triggers capital gains, but staying under the NIIT threshold keeps the effective rate lower. The gift avoids capital gains entirely.

Year two: Repeat the 10b5-1 sales at the same pace. If the stock has appreciated, consider whether an exchange fund makes sense for the remaining core position. Set up a line of credit for any large expense that came up during the year.

Year three: By now the concentrated position has been reduced by about 30% to 40%. The risk is meaningfully lower. Decide whether to continue selling or to hold the remaining position as a smaller, intentional bet.

The key is starting. A concentrated position does not fix itself. Working with a tax strategist in San Diego who understands both the equity mechanics and the tax implications can turn the problem into a manageable, multi-year plan. Book a free 15-minute discovery call to talk through your situation at (619) 280-2700 or info@RoadmapTax.com.

FAQ

Is there any way to avoid capital gains tax in California?

No, there is no way to completely avoid California capital gains tax on the sale of appreciated shares you hold. California taxes capital gains as ordinary income at the state level, with a top rate of 13.3%. What you can do is reduce the taxable gain through strategies like donating appreciated shares, using an exchange fund, or spreading sales across multiple tax years.

How much capital gains tax will I pay on $300,000?

It depends on your other income that year. Federally, long-term gains are taxed at 0%, 15% or 20% depending on your taxable income, and the 3.8% net investment income tax can apply on top for higher earners. California taxes the gain as ordinary income at its regular rates, which top out at 13.3%. Each rate only applies to the income that falls inside its bracket, so the combined rate on the whole gain is lower than the top rates added together. A tax strategist can model the actual number for your situation.

What is the capital gains tax trap in California?

California treats all capital gains as ordinary income with no favorable rate, unlike the federal government. This means a large gain in a single year can push part of it into California's highest brackets, which reach 13.3% on income over $1 million. Spreading gains across years is one of the main ways to manage this.

What is a simple trick for avoiding capital gains tax?

There is no simple trick. Legitimate strategies for reducing capital gains tax involve multi-year planning: using a 10b5-1 plan to spread sales across tax years, donating appreciated shares to a donor-advised fund, or contributing shares to an exchange fund under Section 721. None of these are tricks. They are established tax strategies that require planning before the year closes.

What is the IRS 7 year rule?

The IRS 7 year rule generally refers to the statute of limitations for tax assessments. The IRS has three years from the filing date to audit most returns, but that period extends to six years for substantial understatements of income (over 25%), and there is no time limit for fraud or failure to file. The seven-year figure sometimes comes up in the context of installment sale reporting periods for capital gains.

How does a 10b5-1 plan work for RSU diversification?

A 10b5-1 plan is a pre-committed trading plan you set up with your broker. It specifies how many shares to sell, at what price or dates, and over what period. Because the trades are set in advance and you are not making decisions based on inside information, insider trading rules do not apply. For diversification, it is the most reliable tool for selling RSUs on a schedule that fits your tax situation.

Next step: if your equity is concentrated in one stock or you're planning a move out of California, see how we build a plan for it: Concentrated Stock & RSU Tax Planning.

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