RSU Tax Planning: What Amazon and Microsoft Employees Need to Know

The Tax Bill That Catches Most Tech Employees Off Guard

Every April, I hear the same story from Amazon and Microsoft employees: "I don't understand my tax bill. I had a lot of RSUs vest this year and now I owe more than I expected." It's one of the most predictable and preventable surprises in tech compensation — and it comes from a single, systemic flaw in how RSU taxes are withheld.

Understanding RSU taxation isn't complicated, but it requires knowing how the system works and building a proactive strategy around it. I've helped dozens of Eastside tech professionals build that strategy. Here's the framework.

How RSUs Are Taxed — The Basics

RSUs are taxed as ordinary income at the moment they vest. When 100 shares vest at a price of $200 per share, you've received $20,000 of compensation — taxable at your marginal federal rate, plus Washington has no state income tax, plus FICA payroll taxes if you're under the Social Security wage base.

The price at vesting becomes your cost basis. If you hold the shares and sell them later at $210, you have $10 of capital gain per share — not $210 of ordinary income. Understanding this distinction matters both for tax planning and for deciding how long to hold concentrated positions.

The Withholding Gap — Where the Tax Surprise Comes From

When RSUs vest, your employer is required to withhold federal income tax. The default withholding rate for supplemental wages (which RSUs are) is 22%.

This is where the problem starts. If you're a software engineer at Amazon or Microsoft with a total compensation package of $350,000 or more, your effective marginal tax rate on RSU income is likely 32–37%, not 22%. The 15-point gap doesn't sound dramatic. On a $100,000 vest, it represents $15,000 in taxes that weren't withheld.

By April of the following year, that gap is due — with interest if the underpayment is large enough to trigger the underpayment penalty. The surprise isn't a calculation error. It's a structural feature of how supplemental wage withholding works.

How to Fix the Withholding Gap

There are three ways to address this, and they can be used in combination:

Option 1: Request higher withholding at vesting. Many employers allow employees to request supplemental withholding at a rate above 22%. Check with your payroll department or HR portal. Electing 37% withholding at vest eliminates most of the gap for high earners.

Option 2: Make quarterly estimated tax payments. After each vest, calculate your approximate additional tax liability and pay it directly to the IRS via EFTPS or Direct Pay, before year-end. This avoids underpayment penalties and gives you control over timing.

Option 3: Adjust your W-4 withholding. Increase the amount withheld from your regular paycheck each pay period, effectively spreading the tax burden across the year. This is the least precise approach but requires no action at each vest event.

I typically recommend a combination of Options 1 and 2 for clients with large, irregular vest schedules. The goal is to bring actual tax liability in close alignment with amounts paid, without creating large overpayments that sit with the IRS interest-free.

The Diversification Decision

A question I get constantly: "Should I hold my Amazon/Microsoft stock after vesting, or sell immediately?" This is a portfolio question as much as a tax question, and it's worth separating the two.

From a tax standpoint, shares sold within a year of vesting generate short-term capital gains taxed as ordinary income. Shares held for more than a year qualify for long-term capital gains rates — 15% or 20% for most high earners, significantly below the ordinary income rate.

From a concentration risk standpoint, holding large amounts of a single employer's stock creates a specific kind of risk: your human capital (income from employment) and financial capital (stock holdings) are correlated. A company-specific event — earnings miss, layoffs, regulatory problem — hits your income and your portfolio simultaneously. This is a risk worth managing deliberately.

My general framework: shares that represent more than 10–15% of your investable assets are worth a systematic diversification strategy. That strategy can be tax-efficient — spreading sales over multiple years to manage gains, pairing sales with tax-loss harvesting, or using charitable giving with appreciated shares.

ESPP — The Layer Most Employees Leave Behind

Both Amazon and Microsoft offer Employee Stock Purchase Plans, and the tax treatment is distinct from RSUs. ESPP shares purchased at a discount carry two types of potential income: a "discount" component taxed as ordinary income, and an appreciation component taxed as capital gains (short or long-term depending on holding period).

The key planning consideration: holding ESPP shares long enough to qualify for "qualified disposition" treatment (generally 2 years from the offering date and 1 year from purchase) can shift a portion of the gain from ordinary income to capital gains. Whether that trade-off makes sense depends on the discount size, anticipated stock appreciation, and your overall tax situation.

Multi-Year Tax Planning

The most sophisticated RSU tax planning happens across multiple years, not within a single filing. A few strategies worth considering:

• Roth conversions in low-vest years: If your vest schedule is lumpy — heavy in some years, light in others — low-vest years may be opportunities to do Roth conversions at lower marginal rates.
• Tax-loss harvesting: In years when other investments are down, realizing losses can offset RSU ordinary income up to $3,000/year directly, with carryforward for excess losses.
• Charitable giving with appreciated shares: Donating appreciated stock (shares held more than one year) to a donor-advised fund generates a deduction at fair market value without recognizing the gain. Highly effective for employees with large long-term appreciated positions.
• Deferred compensation plans: Microsoft and some other employers offer non-qualified deferred compensation. Deferring RSU income into an NQDC plan delays tax and can be coordinated with retirement timing.

Getting This Right

RSU tax planning is one of the areas where the gap between "winging it" and "doing it intentionally" is largest in dollar terms. The decisions are repeatable and predictable — the vest schedule is known, the rates are known, the tools are known. The only variable is whether you build a system around them.

I work with tech professionals across Amazon, Microsoft, and Bellevue's broader tech ecosystem, building multi-year tax plans that coordinate RSU withholding, estimated payments, ESPP decisions, and Roth contributions. If you'd like to see what that looks like applied to your specific situation, schedule a conversation with me — or start with the Qualitative Questionnaire on my page.

Securities and advisory services offered through LPL Financial, a registered investment advisor. Member FINRA/SIPC. SC Financial Group and LPL Financial are separate entities. This article is for educational purposes only and does not constitute investment advice.

---

Investing involves risk including loss of principal. No strategy assures success or protects against loss. Past performance is not a guarantee of future results.

The LPL Financial registered representatives associated with this website may discuss and/or transact business only with residents of the states in which they are properly registered or licensed. No offers may be made or accepted from any resident of any other state.