The five parts of total compensation
| Component | What It Is | Tax Treatment | Risk Level |
|---|---|---|---|
| Base salary | Fixed annual cash paid each pay period | Ordinary income + FICA (withheld via W-4) | None — guaranteed per contract |
| Annual bonus | Discretionary or formula-driven cash, paid 1–2x/year | Ordinary income; often withheld at 22% flat federal supplemental rate | Medium — may be reduced or eliminated |
| RSU (Restricted Stock Unit) | Promise of company shares that vest on a schedule | Ordinary income at vest; capital gains on post-vest appreciation | High — value fluctuates with stock price; unvested forfeited on quit |
| ESPP (Employee Stock Purchase Plan) | Right to buy company stock at a discount (typically 15%) via payroll deductions | Discount portion = ordinary income at sale; remainder may be capital gains | Medium — money tied up during offering period; qualifying vs. disqualifying dispositions differ |
| 401(k) match | Employer contribution matching your own 401(k) deferrals | Pre-tax; taxed as ordinary income at withdrawal | Low — but vesting cliff means unvested match is forfeited if you leave early |
Why company stock grants are taxed the moment they vest
RSUs vest, then they are taxable. The moment shares are delivered to you, the fair market value on that date is ordinary income — it appears on your W-2 just like salary. You owe income tax on it whether or not you sell the shares. If the stock then rises after vest, the additional gain is a capital gain; if it falls after vest, you cannot recover the income tax you already paid on the higher vest-date value.
A worked example of stock-grant tax at vesting
You receive 1,000 RSUs that vest over 4 years (250 shares/year). At the first vest, the stock price is $40. The IRS treats 250 × $40 = $10,000 as ordinary income in that tax year — it appears on your W-2. Your employer withholds shares to cover taxes (common: 22% supplemental rate + state). If you keep the remaining shares and the stock falls to $25 two years later, you still owed tax on $10,000 at vest. The $15/share loss on post-vest shares is a capital loss, separately computed. The lesson: an RSU grant at $40 is NOT the same as $10,000 of cash, because the tax is locked in at vest regardless of what happens to the stock price afterward.
How bonuses and stock grants are actually withheld
Employers withhold tax on supplemental wages (RSU vests, bonuses, commissions) at a flat federal rate -- 22% on the first $1 million of supplemental wages in a year, then 37% on anything above that (IRS Pub. 15, Section 7; rates set annually by the IRS via Rev. Proc.). On top of that come Social Security (6.2% up to the annual wage base) and Medicare (1.45%, plus an extra 0.9% on high earners). The trap: that flat 22% is often LESS than your true marginal rate, so a large RSU vest can leave you under-withheld and owing more at filing time -- check your effective rate and consider extra withholding or an estimated payment.
How a stock purchase plan discount is taxed
ESPP discount taxation has two modes. A 'qualifying disposition' means you hold ESPP shares for at least two years from the offering date and one year from purchase — the discount is ordinary income, but any additional gain above the discounted price is long-term capital gain (lower rate). A 'disqualifying disposition' (selling too soon) converts the entire gain to ordinary income. For most employees, the 15% discount alone makes ESPP participation worthwhile even with disqualifying dispositions.
The first trap: concentration risk compounds invisibly
The second trap: selling too soon converts the gain to ordinary income
The 1-year + 2-year qualifying-disposition window is a decision, not a formality. Hold ESPP shares at least one year from the purchase date AND two years from the offering date and the gain above the discounted price qualifies for long-term capital-gain rates (typically 15-20% federal). Sell sooner and the ENTIRE gain becomes ordinary income, taxed at your marginal rate (often 32-37% for the target audience here). On a $10,000 disqualified gain at a 35% marginal rate, that is roughly $1,500-$2,000 of avoidable tax. The qualifying window is the difference between a tax-favored event and an ordinary-income event.
The third trap: underwater shares can still harvest a tax loss
Tax-loss harvesting works on underwater ESPP shares. If your ESPP shares are below the discounted purchase price at the next non-purchase window, selling locks in a capital loss that offsets other capital gains (and up to $3,000/year of ordinary income, with the remainder carrying forward indefinitely — see the Capital Loss Carryforward glossary entry). The 30-day wash-sale rule applies, so do not immediately re-buy the same stock. ESPP participants frequently let underwater shares ride out of attachment; the tax loss is real money left on the table.
How a vesting cliff can cost you the match
The 401(k) match has a vesting cliff. If your employer offers 100% match up to 4% of salary but vests over three years, leaving after 18 months means you keep zero employer contributions. Check your plan document's vesting schedule before accepting a role — a two-year cliff with a $10,000 annual match is a $20,000 retention incentive hiding in plain sight.
Adding up your first-year total compensation
Effective First-Year Comp = Base + Expected Bonus + Year-1 Vested RSU Value + ESPP Discount + Vested Match
Which parts of an offer you can negotiate
What is negotiable in an offer, item by item
| Item | Negotiable? | Notes |
|---|---|---|
| Base salary | Usually yes, within band | Ask for the top of the published level band if visible |
| Signing bonus | Often yes | Typically repaid (pro-rata) if you leave within 1–2 years |
| RSU grant size | Sometimes — especially at offer stage | Harder post-hire; the initial grant is the easiest leverage point |
| Bonus target % | Rarely — set by level | You can negotiate the level itself; the % follows |
| ESPP participation | No | Plan-wide terms; individual elections only affect your contribution rate |
Break down your own offer letter
Comparing a cash-heavy offer with an equity-heavy one
Questions worth exploring with the AI assistant in the app:
- From the total-compensation lesson: I saw how a $130K all-cash offer and a $110K offer with RSUs can land within a few thousand dollars of each other in year one, yet carry very different risks. Walk me through the questions to ask when comparing two offers like these -- vesting cliffs, what happens to unvested equity if I leave, and how much of year-one pay depends on the share price holding. Teach me the framework; do not tell me which offer to take.
- The lesson explained that RSU vests are taxed as ordinary income at vesting and withheld at the flat 22% supplemental rate, which can under-withhold for someone in a higher bracket. Explain, like a teacher, how to check whether a vest was under-withheld, and how the concentration-risk trap works when an ESPP, an RSU grant, and a 401(k) all hold the same employer's stock. This is for my education, not tax or investment advice.
Sit with the ideas.
You hold 500 RSUs that vest today. The company stock is at $60/share. Your marginal federal+state income tax rate is 35%. Which statement is correct?