RSU Tax Strategies for Tech Workers: What Your Company Doesn't Tell You
Your RSUs just vested. It's exciting — 500 shares of your company's stock, now yours. You feel the wealth. Then you look at your pay stub or tax return and realize the government felt it too. Significantly.
This is a scenario that plays out for thousands of tech workers every quarter, and most of them are blindsided — not because they're financially unsophisticated, but because RSU taxation is genuinely counterintuitive, and nobody at HR walks you through the details.
This guide covers how RSUs are actually taxed, the specific mistakes that cost people the most, and the strategies worth understanding before your next vest date.
Note: Tax law is complex and individual circumstances vary. This article is educational.
Table of Contents
How RSUs Are Actually Taxed
The Withholding Trap
Strategies to Manage Your RSU Tax Burden
The Concentration Risk Problem
Sell Immediately or Hold?
Timing Considerations
How RSUs Are Actually Taxed
RSUs are taxed as ordinary income at vesting — not when you receive the grant, and not only when you sell.
This is the first thing many people misunderstand. The moment your RSUs vest, the shares' full fair market value is treated as compensation income, just like a salary payment. If 500 shares vest and the stock is trading at $150/share, you've just received $75,000 of taxable income — regardless of whether you sell a single share.
That $75,000 gets added to your other W-2 income and taxed at your marginal rate. For most tech workers in high-cost-of-living states, that rate — federal plus state — often lands in the 35–45% range.
After vesting, any subsequent gain or loss from that point is treated as a capital gain or loss. Hold the shares for more than a year and those gains get taxed at the lower long-term capital gains rate. Sell within a year and they're taxed as ordinary income again.
The two-step taxation structure matters: vesting = ordinary income event. Subsequent sale = capital gain or loss event, with the clock starting at vest.
The Withholding Trap
Here's where most people get into trouble.
When your RSUs vest, your company withholds taxes to cover your liability. The default federal withholding rate for supplemental wages (which RSUs are classified as) is 22%. Many companies apply this automatically unless you request otherwise.
But 22% is the rate for the 22% federal bracket. If your income — salary plus RSU vest — puts you in the 32%, 35%, or 37% bracket, you've just dramatically underpaid your taxes at the source. You'll owe the difference at tax time.
Let's make this concrete. Say 1,000 RSUs vest when your company's stock is at $200/share. That's $200,000 of taxable income.
Your company withholds at 22%: $44,000
Your actual federal marginal rate is 35%: you owe $70,000
Gap: $26,000 owed at tax time, plus potential underpayment penalties
This isn't rare. For tech workers with salaries in the $150k–$250k range, a substantial RSU vest routinely pushes total compensation into brackets where the 22% default withholding falls significantly short.
The fix: Contact your HR or stock plan administrator before your next vest date and ask whether you can adjust your withholding election. Some plans allow you to elect a higher withholding percentage or choose different sell-to-cover ratios to better cover your actual liability. At minimum, knowing your gap allows you to set aside the difference proactively.
Strategies to Manage Your RSU Tax Burden
Max Out Tax-Deferred Accounts First
The single most effective way to reduce your taxable income in an RSU vest year is to maximize contributions to pre-tax retirement accounts. 401(k) contributions reduce your W-2 income dollar-for-dollar. In 2026, the employee 401(k) contribution limit is $23,500.
For high earners, this may also be the year to look at whether your employer plan supports mega backdoor Roth contributions — after-tax 401(k) contributions up to the IRS annual additions limit, which can then be converted to Roth. This strategy isn't available in every plan, but where it is, it can provide significant tax-advantaged room beyond the standard contribution limit.
Use an HSA If You're Eligible
Health Savings Accounts have a triple tax advantage: contributions reduce taxable income now, growth is tax-free, and withdrawals for qualified medical expenses are tax-free. For 2026, the HSA contribution limit is $4,300 for individual coverage and $8,550 for family coverage.
One nuance: HSA contributions made through payroll also reduce FICA taxes (Social Security and Medicare), making them slightly more efficient than 401(k) contributions in that specific respect. If you're on a high-deductible health plan and not contributing to an HSA, this is worth a close look in a vest year.
Tax-Loss Harvesting to Offset Gains
If you have positions in a taxable account that are currently at a loss, a vest year is a good time to review whether harvesting those losses makes sense. Capital losses can offset capital gains dollar-for-dollar, and up to $3,000 of excess losses can offset ordinary income annually (with unused losses carried forward indefinitely).
This doesn't change your RSU income, which is ordinary income regardless. But it can reduce capital gains on other positions — and if you've held appreciated RSUs from prior vest periods, planning your sales around tax-loss harvesting opportunities can reduce your overall tax burden.
Consider Charitable Giving in High-Income Years
A significant vest year often means a higher income than usual. If you're charitably inclined, high-income years are typically the most tax-efficient time to give. Donating appreciated stock directly (rather than cash) to a charity or donor-advised fund avoids capital gains on the appreciation and generates a deduction for the full fair market value.
This is a more advanced strategy and depends heavily on your specific income level, itemization status, and charitable intent — but it's worth understanding exists before a high-vest year passes.
The Concentration Risk Problem
RSU tax strategy and concentration risk are connected. The more you hold company stock, the more RSU tax decisions and portfolio risk decisions are intertwined.
A concentrated position in your employer's stock creates a specific kind of risk: you're effectively making a double bet on the same company. Your income depends on it. Your net worth depends on it. If the company hits trouble, those two things can deteriorate at the same time — as employees at various high-profile tech companies have experienced when layoffs coincided with significant stock price drops.1
Most advisors suggest keeping no more than 10–15% of your total portfolio in a single stock. For many tech workers receiving regular RSU grants, holding below that threshold requires active, ongoing selling.
This creates a natural tension between tax planning (holding shares for more than 12 months to access long-term capital gains rates) and portfolio management (diversifying away from single-stock concentration). Knowing where that trade-off sits for your specific situation is worth working through carefully.
Sell Immediately or Hold?
This is the question every RSU holder eventually asks, and the honest answer is: it depends, and the math is more nuanced than most people think.
The case for selling immediately at vest: You've already paid income taxes on the full value. By selling immediately, you eliminate further concentration risk with no additional tax cost — there's no gain or loss to worry about because you're selling at the same price you were taxed on. You take the after-tax proceeds and invest them in a diversified portfolio of your choosing.
The case for holding: If you have conviction that the stock will appreciate, you can start the 12-month clock at vest and eventually pay long-term capital gains rates on any appreciation above the vest price. But this comes with the risk of the stock declining — meaning you'd pay taxes on income that no longer exists as wealth.
The asymmetry matters: selling at a loss after holding doesn't eliminate the income tax you already paid. You paid taxes on $200/share; if you hold and the stock drops to $140, you have a capital loss of $60/share — but you don't get back the ordinary income taxes you paid on the original vest value.
A common practical approach is to establish a consistent rule — sell a fixed percentage at every vest — rather than making case-by-case decisions that tend to be influenced by recent price movements.
Timing Considerations
A few calendar-aware points:
Estimated taxes. If you anticipate a large RSU vest, you may need to make quarterly estimated tax payments to avoid underpayment penalties. The IRS requires that you pay at least 90% of your current-year tax liability (or 100% of last year's tax) throughout the year. A large vest in Q1 can create a gap that, left unaddressed, results in penalties.
Year-end planning. If you have flexibility on vest timing (less common, but some plans allow deferral elections), the tax year matters. A vest in December vs. January can shift significant income between tax years.
Holding period clock. The 12-month clock for long-term capital gains rates starts at the vest date, not the grant date. Many people assume the grant date matters — it doesn't for RSUs.
The Bottom Line
RSU tax planning isn't glamorous, but it's one of the areas where understanding the rules can make a measurable difference. The withholding trap alone — the gap between the 22% default and your actual marginal rate — catches a surprising number of people in their first or second year of meaningful RSU vesting.
The key moves: know your actual tax exposure before vesting, adjust withholding where possible, maximize pre-tax contributions in vest years, and think about concentration risk as a portfolio problem, not just a tax problem.
Astor can help you understand the concentration risk side of the equation — showing you how your RSU holdings fit into your overall portfolio picture across all your connected accounts.
Astor provides educational tools and information, not personalized tax or financial advice. Please consult a qualified tax professional or financial advisor for guidance specific to your situation.
FAQ
How are RSUs taxed? RSUs are taxed as ordinary income when they vest. The full fair market value of the shares on the vest date is added to your W-2 income and taxed at your marginal federal and state rates. Any gain or loss after vesting is treated as a capital gain or loss, with the 12-month holding period clock starting at the vest date.
What is the withholding trap with RSUs? The default federal tax withholding rate for RSU vests is 22% — the rate for the 22% bracket. If your total income puts you in a higher bracket (32%, 35%, or 37%), your employer's default withholding covers less than your actual liability, leaving you with a gap to pay at tax filing. For tech workers with higher salaries, this gap can be significant.
Should I sell RSUs immediately or hold them? There's no universal right answer. Selling immediately at vest eliminates concentration risk with no incremental tax cost (since you're selling at the price you were already taxed on). Holding starts the clock for long-term capital gains rates on future appreciation, but introduces the risk of the stock declining — meaning you'd owe taxes on income that no longer exists as wealth. Many people find a consistent rule (sell X% at every vest) more disciplined than case-by-case decisions.
How do I reduce taxes on RSU income? Several approaches can reduce your overall tax burden in a vest year: maximizing 401(k) and HSA contributions to reduce taxable income, tax-loss harvesting other positions to offset gains, and — in high-income years — charitable giving with appreciated stock. The withholding adjustment is also important: ensuring your tax withholding actually matches your expected liability prevents underpayment at filing.
Sources
Strategies For Tech Workers to Manage Taxes on RSUs — Chris Reddick Financial Planning
Top 4 Ways to Reduce Taxes on RSU Income — Consilio Wealth Advisors