RSU Tax Planning for Tech Employees: How to Not Get Blindsided at Vest

RSUs seem straightforward — your company grants you shares, they vest over time, you get the stock. But the tax mechanics are easy to misread, and the default behavior most employers set up (withhold 22%, sell to cover, move on) leaves a lot of tech workers with a surprise tax bill in April and a poorly diversified portfolio by year five.

This guide covers how RSUs are actually taxed, where the traps are, and how to think about equity as part of a total financial plan rather than free money that arrives quarterly.

How RSUs are actually taxed

When RSU shares vest, the IRS treats the fair market value of those shares as ordinary wage income — not capital gains, not a bonus that's taxed differently. It goes on your W-2 right alongside your salary.

Example: You have 1,000 RSUs vesting in March. Your company's stock is at $150. At vest, you've received $150,000 of ordinary income. That amount is subject to:

• Federal income tax at your marginal rate (up to 37% in 2026)
• State income tax (California's top rate is 13.3%; Washington has no income tax)
• FICA taxes — Social Security (6.2%, up to the $184,500 wage base¹) and Medicare (1.45% + 0.9% Additional Medicare Tax above $200K single / $250K MFJ)

After vest, the $150 per share becomes your cost basis. If you hold the shares and sell later at $180, you owe capital gains tax only on the $30 gain — not on the original $150.

The withholding trap most tech employees walk into

Here's where it breaks down. The IRS requires employers to withhold on supplemental wages (which RSU vesting is) at a flat 22% federal rate — or 37% only if your cumulative supplemental wages in the year exceed $1 million.²

But if your total comp puts you in the 32%, 35%, or 37% bracket — which happens at roughly $200K+ individual income in high-comp metros — 22% withholding isn't enough. The gap is your problem to fund.

Scenario: $300K in RSUs vest throughout the year. Your company withholds 22% federal ($66K). You're in the 37% bracket. Your actual federal liability on those RSUs: $111K. Gap: $45,000 — due April 15.

The fix is straightforward but requires action:

• Adjust your W-4 withholding on regular wages to over-withhold for the rest of the year.
• Make estimated quarterly tax payments directly to the IRS (and your state) — use IRS Form 1040-ES.
• Set aside 37–40% of every vest event in a HYSA or short-term T-bill, earmarked for taxes.

Some companies let you elect supplemental withholding above the 22% default. Worth checking with your payroll team.

After vesting: the capital gains clock starts

Once shares vest and you don't sell immediately, you've started the long-term capital gains holding clock. If you hold for more than 12 months from vest date before selling, gains are taxed at long-term rates rather than ordinary income rates.

2026 long-term capital gains rates by filing status:³

• 0% — taxable income up to $48,350 (single) / $96,700 (MFJ) Note: these are 2025 confirmed thresholds; 2026 single/MFJ adjusted to ~$49,450 / $98,900 per IRS inflation adjustment
• 15% — the middle band covering most tech employees
• 20% — taxable income above ~$523,050 (single) / $613,700 (MFJ) in 2026

Additionally, the Net Investment Income Tax (NIIT) adds 3.8% on investment income (including capital gains) for taxpayers with modified AGI above $200K (single) or $250K (MFJ). These thresholds are not inflation-adjusted.⁴

So for a senior engineer earning $450K total comp in California, selling vested RSUs held over 12 months means: 20% federal LTCG + 3.8% NIIT + 13.3% CA income tax = ~37% effective rate on gains. The holding period saves you some money versus ordinary income rates, but not as much as people assume if you're in California.

Sell-to-cover vs hold: a framework

Most companies default you to "sell-to-cover" — they sell enough shares at vest to cover the withholding (22%) and give you the rest. You end up holding most of the shares. This is rarely a conscious financial decision.

The alternative is "sell all at vest" — take the shares as cash, pay taxes from proceeds, and deploy the after-tax money into diversified assets. This feels wrong to employees who believe in their company, but it's worth stress-testing the assumption.

Questions to ask before defaulting to hold:

• What percentage of my net worth is in my employer's stock, counting unvested grants?
• Would I buy this stock with cash if I didn't work there?
• If the stock dropped 50% — which tech stocks regularly do — what does my financial situation look like?
• Am I holding because of a genuine conviction about the company's prospects, or because of loss aversion and inertia?

There's no universally correct answer. But the decision deserves intention. "Sell to cover, hold the rest" is a default, not a strategy.

Concentrated stock risk: when RSUs become a liability

Tech workers who've been at the same company for 3–5 years and held most vested shares often end up with 40–70% of their net worth in a single stock. This is concentrated risk by any financial planning definition, and it gets worse as the stock appreciates.

Common scenarios where this bites:

• The company corrects. Tech stocks routinely retrace 40–60% during market cycles. In 2022, Meta dropped 77% peak to trough. If that's your concentrated position plus your job, you've taken a double hit simultaneously — layoff risk plus portfolio loss.
• You leave the company. Many people plan to "diversify when I leave," then realize they'd owe capital gains on years of appreciation all at once. The tax bill suppresses action.
• You hold waiting for a round number. "I'll sell when it hits $300" is anchoring, not investing. The stock doesn't know where you bought it.

A common framework: keep no more than 10% of investable net worth in any single stock, including your employer. Getting to that threshold over time may mean selling systematically on a schedule rather than waiting for the "right" moment.

Specific tools for managing concentration:

• 10b5-1 plan: Set up a pre-scheduled automated selling plan when you're not in a blackout period. Trades execute on the schedule regardless of price. Removes market-timing emotion and provides protection against insider trading claims.
• Tax-loss harvesting coordination: If you have other capital losses in the portfolio, use them to offset gains from RSU sales. A fee-only advisor can run the math across your full picture.
• Charitable giving of appreciated shares: Donating appreciated stock directly to a DAF or charity avoids the capital gains while giving you a full deduction at FMV. Better than selling then donating cash.

Double-trigger RSUs and pre-IPO timing

If you work at a private tech company, your RSUs likely have a "double trigger" — they don't vest until both (1) your time-based cliff/schedule triggers AND (2) a liquidity event (IPO, acquisition). Until both happen, you have no shares and no tax event.

At IPO, a large pile of RSUs often vest simultaneously. If you're at a hot IPO and $2M worth of shares vest in the same tax year, you'll have an extraordinarily high ordinary income year. Planning options to explore well before the IPO:

• Check if your company allows early exercise elections on any options (different from RSUs, but often exists alongside them).
• Coordinate with a CPA to model your expected tax year — you may need large estimated payments well before April 15.
• Understand the lockup period (typically 180 days post-IPO) and plan your selling strategy within it. You can't sell during lockup, so you need cash reserves to cover taxes on vesting income during that window.
• If you're in California, the AGI spike from IPO vesting pushes you into IRMAA territory for Medicare and may affect other phaseouts — worth modeling the full picture.

Building an RSU strategy (not just a tax plan)

RSU tax planning is table stakes. The bigger question is how equity fits into your total financial plan:

• What's your vest schedule and how does it interact with your other income? If you have a big vest quarter coming, plan your other deductions (maxing 401k early in the year, making large charitable gifts in that year, HSA contributions) to offset the income spike.
• Does your 401k have Mega Backdoor Roth capacity? If yes, the $69,000 total 401k limit (2026) means you can make after-tax contributions and convert them to Roth, reducing the amount sitting in taxable accounts. See our Mega Backdoor Roth guide.
• Are you coordinating with a rental property, business income, or a spouse's income? These interact with RSU income in ways that aren't obvious — carryover losses, NIIT thresholds, IRMAA triggers.
• Do you have a house purchase in the next 2–3 years? The timing of RSU sales relative to a down payment changes the tax math. In some cases it makes sense to sell and pay taxes early to get money into lower-risk assets before you need it.

When RSU complexity warrants a financial advisor

A spreadsheet gets you pretty far. But there are inflection points where the complexity of RSU planning — combined with total comp structure, housing decisions, and career moves — is hard to optimize alone:

• Your total comp is $500K+ and you have 3+ years of unvested grants
• You're sitting on a significant concentrated position and want to de-risk without triggering a massive tax bill all at once
• You're at a pre-IPO company with double-trigger RSUs and want to model the IPO tax year
• You're weighing a job change and need to compare unvested equity at current company vs new offer
• You have RSUs, ISOs, an ESPP, a 401k with Mega Backdoor Roth, and a partner with their own equity comp — and the interactions aren't clear

Fee-only advisors who work with tech employees deal with these situations every week. They're compensated by you directly, not by commissions — so their incentive is to optimize your situation, not sell you a product.