Most of the SpaceX lockup guides floating around right now are written for a generic employee in a generic state. They'll tell you RSUs are taxed at vesting and ISOs can trigger AMT, and that's all true. But they skip the part that matters most to you — the part where you live in California.
California changes the math on almost everything. The state taxes capital gains as ordinary income. There's no preferential rate for holding shares longer than a year. The top marginal rate is 13.3%. And when you stack that on top of federal taxes and the net investment income tax, the combined bite on equity compensation income can exceed 50%.
If you're a SpaceX employee working in Hawthorne — or anywhere in California — here's what the tax picture actually looks like for each type of equity you might hold.
The California Difference in One Table
At the federal level, long-term capital gains get a preferential tax rate — up to 20% instead of the top 37% ordinary income rate. California doesn't make that distinction. Here's why that matters.
| Income Type | Federal Top Rate | California Top Rate | Combined* |
|---|---|---|---|
| Ordinary income (salary, RSU vesting, NSO exercise) | 37% | 13.3% | 50.3%+ |
| Short-term capital gains (shares held < 1 year) | 37% | 13.3% | 50.3%+ |
| Long-term capital gains (shares held > 1 year) | 20% | 13.3% | 37.1%+ |
| Net Investment Income Tax (NIIT) | 3.8% | n/a | Added to above |
*Combined rates shown are top marginal rates including the 3.8% NIIT where applicable. Actual rates depend on income level and filing status. The key takeaway: California's 13.3% applies to all capital gains regardless of holding period — the federal LTCG preference only helps at the federal level.
How Each Equity Type Gets Taxed in California
If you hold multiple types of SpaceX equity, each one creates a different tax event at a different time. Here's what California employees need to know about each.
RSUs — Restricted Stock Units
RSUs are the most common equity at SpaceX today, vesting over a 5-year schedule at 20% per year. The tax mechanics are straightforward — but the amounts involved post-IPO make the impact significant.
| Taxable event | When shares vest |
| What's taxed | Fair market value at vesting, as ordinary income |
| After vesting | Additional appreciation taxed as capital gains when sold |
| California catch | Vesting income hits at full ordinary rates. If you vest into a high-value stock, a single vesting event could push you into the 13.3% bracket. |
For a detailed walkthrough: The RSU Playbook for California Tech Employees →
ISOs — Incentive Stock Options
ISOs are the most tax-complex equity type SpaceX employees hold. They offer the potential for favorable long-term capital gains treatment — but they also carry AMT risk that can create a tax bill even when you don't sell a single share.
| Taxable event | At exercise (for AMT); at sale (for regular income tax) |
| AMT exposure | The spread (FMV minus strike price) at exercise is an AMT preference item |
| Qualifying disposition | If held 2+ years from grant date AND 1+ year from exercise → LTCG treatment |
| Disqualifying disposition | If holding periods not met → spread taxed as ordinary income |
| California catch | Even with a qualifying disposition, California taxes the gain at ordinary income rates. The LTCG benefit is federal only. And 2026 AMT changes make exposure worse. |
Example: The Hidden AMT Bill
| ISO strike price (early grant) | $15 / share |
| FMV at exercise (post-IPO) | $161 / share |
| Spread per share (AMT preference item) | $146 / share |
| If exercising 5,000 shares | $730,000 AMT preference |
| Shares sold? | Zero. You still owe AMT. |
This is a simplified illustration. Your actual AMT depends on total income, deductions, and the 2026 AMT phaseout thresholds. 2026 AMT changes explained →
NSOs — Non-Qualified Stock Options
NSOs are more straightforward than ISOs, but the tax hit at exercise is immediate and full.
| Taxable event | At exercise |
| What's taxed | Spread at exercise taxed as ordinary income + payroll taxes (Social Security up to wage base, Medicare uncapped) |
| After exercise | Additional appreciation taxed as capital gains when sold |
| California catch | Exercise income stacks on top of your salary and any RSU vesting. Timing your NSO exercise relative to other income sources can meaningfully change your marginal rate. |
Compare stock options and RSUs in California →
ESPP — Employee Stock Purchase Plan
ESPP shares are often an afterthought, but they carry their own set of rules that trip people up — especially around the distinction between qualifying and disqualifying dispositions.
| Taxable event | At sale |
| Qualifying disposition | Hold 2+ years from offering date AND 1+ year from purchase → discount taxed as ordinary income, remainder as LTCG (federal benefit only in CA) |
| Disqualifying disposition | If holding periods not met → full discount taxed as ordinary income |
| California catch | Same as ISOs — even if you qualify for LTCG federally, California taxes all gains at ordinary rates. The holding period math matters less at the state level. |
What $1 Million in SPCX Income Looks Like After Taxes
Numbers make this concrete. Here's an approximate picture of what a California-based SpaceX employee keeps on $1 million in equity compensation income, depending on how it's classified.
| Scenario | Federal | California | NIIT | You Keep (approx.) |
|---|---|---|---|---|
| $1M taxed as ordinary income (RSU vesting, NSO exercise) | ~$370K | ~$133K | ~$38K | ~$459K |
| $1M taxed as LTCG (shares held 1+ year post-vest/exercise) | ~$200K | ~$133K | ~$38K | ~$629K |
| Same $1M LTCG in Texas (no state income tax) | ~$200K | $0 | ~$38K | ~$762K |
These are simplified estimates using top marginal rates to illustrate the impact of California taxation. Your actual tax depends on total income, filing status, deductions, and other factors. Effective rates may be lower. This is not tax advice — work with a qualified professional for your specific numbers.
On the same $1M in long-term capital gains, a California employee keeps approximately $133K less than an identical employee in Texas — entirely because of state tax. That gap gets wider as the numbers get bigger. Strategies to reduce your California tax exposure →
California Tax Traps SpaceX Employees Miss
Beyond the rate difference, there are specific California-related traps that catch SpaceX employees off guard during and after the lockup period.
Trap #1: "I'll hold for long-term capital gains treatment."
This is the right instinct at the federal level — the LTCG rate is significantly lower than ordinary income. But California doesn't care. You'll still owe 13.3% at the state level whether you hold for one month or five years. The federal savings are real, but the state-level savings are zero. Factor both into the decision.
Trap #2: Forgetting estimated tax payments.
If you sell shares in Q3 or Q4, withholding from your paycheck probably won't cover the tax on a large equity sale. California's Franchise Tax Board expects estimated payments. Miss them and you'll owe underpayment penalties on top of the tax itself. Your CPA should model this before the first lockup window opens.
Trap #3: Ignoring the SALT deduction cap.
The state and local tax deduction is capped at $40,000 for 2026. That means most of the California tax you pay on equity compensation income is not deductible on your federal return. You're paying the full 13.3% with limited federal offset. 2026 SALT changes explained →
Trap #4: Moving out of state and assuming you're done.
California can tax equity compensation income based on where you worked when the equity was earned — not just where you live when you sell. If you were a California resident when your RSUs were granted or your options were vested, California may assert a claim to a portion of that income even if you've since moved to Texas, Nevada, or Washington. The sourcing rules are complex and worth getting right.
Trap #5: Exercising ISOs without modeling AMT first.
The 2026 OBBBA tax changes lowered AMT phaseout thresholds and doubled the phaseout rate. If you exercise ISOs with a large spread, you could trigger tens of thousands in AMT — money owed this year, even if you don't sell a share. Run the numbers before you exercise.
What This Means for Your Lockup Strategy
California's tax landscape doesn't just change how much you owe — it changes how you should think about timing. A few principles that matter for California-based SpaceX employees specifically:
Model every lockup window with California rates baked in.
Generic guides that show federal rates only understate your actual tax burden by 13+ percentage points. Any scenario modeling that doesn't include California's ordinary income rate on capital gains is incomplete. This is tax planning, not tax prep.
Consider whether holding for federal LTCG treatment is worth the concentration risk.
The federal rate difference between ordinary income (37%) and LTCG (20%) is meaningful — 17 points. But holding a concentrated SPCX position for 12+ months to capture that savings means 12+ months of stock price risk. Concentration risk doesn't pause while you wait for tax advantages.
Charitable giving with appreciated SPCX shares is especially powerful in California.
Donating appreciated stock directly to a donor-advised fund can eliminate both federal and state capital gains tax on the donated shares. In California, that's a bigger benefit than in most states because of the 13.3% you're avoiding. More tax strategies for high earners →
Taxes are only one piece of the picture.
See the full lockup timeline, equity type breakdown, and our approach to planning for SpaceX employees.
Financial Planning for SpaceX Employees →This article is for informational and educational purposes only and does not constitute investment, tax, or legal advice. All references to tax rates, equity compensation mechanics, and state tax treatment are general in nature and may not reflect your specific situation. Tax laws and regulations are subject to change. Consult with a qualified tax professional and financial advisor before making financial decisions.