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equity comp

Equity compensation

RSUs, ISOs, NSOs, ESPPs, PSUs, and QSBS: the mechanics, the taxes, and the planning. Every piece here is written for someone whose biggest financial decision this year involves a vesting event or a strike price.

Base salary is the simple part of tech comp. It shows up in a biweekly direct deposit and the withholding tables do most of the thinking for you. Equity is what most people actually get paid in, and equity is where the planning has to happen. A 22% supplemental withholding rate on RSU shares that are really taxable at 35% is not a rounding error. An ISO exercise that looks fine on the offer spreadsheet can land as a six-figure AMT bill the following April. These are not edge cases. They are the plumbing of how tech compensation works, and they’re where the money is won or lost.

Which instrument do you actually have?

The first question is what kind of equity you’re holding, because the tax treatment differs enormously between instruments. RSUs are the default for public tech companies: the shares settle on a schedule and the full value is ordinary wage income at vest. ISOs carry an exercise price and require a hold period, and their distinct feature is the AMT bargain element that doesn’t hit your W-2. NSOs are simpler mechanically but tax the entire spread as ordinary income at exercise. ESPPs are the cleanest win: a 15% discount on a six-month offering produces a guaranteed 18-35% pre-tax return if you participate and sell same-day. And pre-IPO stock at a private company is its own category — the value is contingent, the tax deferred, and the planning very different from anything public.

If you’re starting from zero, read the instrument guide that matches what you hold. That sets the frame for everything else.

The tax moments that actually matter

Equity planning is organized around a small number of high-stakes moments. Vesting day for RSUs, where your employer withholds too little and the gap shows up at filing. Exercise day for ISOs, where a quiet spread turns into AMT preference income. The supplemental-withholding gap is the single most common cause of six-figure April surprises for senior engineers at public companies; the ISO AMT first bill is the equivalent for early-employee startup hires exercising for the first time. Both have concrete math you can run before the event to size the damage. Try the RSU vesting calculator or the ISO AMT calculator against your own numbers.

For founders and early employees, the opposite-side question is QSBS under Section 1202. Done correctly, it eliminates federal tax on up to $10 million (or 10× basis) of gain on qualified C-corp stock held five years. The eligibility calculator checks the main conditions. The supporting articles on 5-year clock mechanics, stacking via non-grantor trusts, and state conformity cover the traps.

The decisions you actually have to make

Once the mechanics are clear, equity planning collapses to three recurring decisions: sell or hold, exercise or wait, contribute or skip. The sell-or-hold framework is really a concentration question layered onto a tax question, and concentrated-stock strategies covers the playbook when your employer’s stock has become a meaningful chunk of your net worth. Exercise decisions for ISOs turn on AMT capacity, liquidity, and conviction about the company. ESPP participation is almost always correct if you can afford the six-month paycheck deferral. For anyone at a public company sitting on a large position, a 10b5-1 plan is the execution vehicle that lets you sell through blackouts; the 2023 cooling-off amendments changed the setup timeline in ways most plan administrators haven’t fully priced in.

If you want the shortest path to answers about your specific numbers, the Q-format question library has pre-computed tax math for 30 amounts across all 50 states and every major tax treatment (RSU, ISO AMT, capital gains, ESPP, QSBS). Pick your amount and state and you’ll land on a page that tells you what you actually owe.

Next step

If you hold public-company RSUs and have never seen what your actual tax bill looks like, run the supplemental-withholding gap calculator against your next vest. If you hold ISOs and are considering a first meaningful exercise, run the AMT calculator. If either number surprises you, that’s the signal to match with an advisor who does equity comp daily rather than trying to figure it out solo.

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