Meet the RSU Tax & Selling Optimizer: Stop Leaving Six Figures on the Table

Alistair TeamJune 17, 20267 min read
MicrotoolsRSUequity compensationISOAMTtax strategymicrotools

Equity compensation is one of the fastest paths to wealth — and one of the easiest to mess up. Between vesting schedules, tax withholding, AMT calculations, and state tax differences, the difference between the right and wrong strategy can be six figures.

Alistair's RSU Tax & Selling Optimizer Microtool models every scenario so you don't leave that money on the table.

What the Tool Models

The RSU Optimizer takes your salary, grant size, current stock price, vested shares, grant type (RSU vs. ISO), and state tax rate — then runs the math across four sell strategies.

The Four Strategies

  • Sell immediately at vest: Covers withholding with shares. Least risk, no additional tax burden beyond your ordinary income rate. All proceeds after withholding are yours free and clear.

  • Hold all shares: Maximum upside exposure. But you're betting your salary and your equity on the same company. And if the stock drops, you still owe taxes on the vest value.

  • Sell half, hold half: A middle ground. You lock in some gains and keep some exposure. The question is whether the math supports it.

  • ISO exercise (if applicable): Models the alternative minimum tax impact of exercising ISOs. AMT can create a tax bill even if you haven't sold a single share — a nasty surprise for the unprepared.

What Each Strategy Reveals

For each strategy, the tool calculates: after-tax proceeds, effective tax rate, AMT exposure (for ISOs), concentration risk (what % of your net worth is in one stock), and net cash after all taxes.

Real Numbers: A Tech Employee with 1,000 RSUs

Let's walk through a real scenario:

  • Salary: $150,000
  • Grant: 1,000 RSUs
  • Current price: $150/share
  • Shares vested: 250
  • State: California (13.3% marginal)

Vested value: $37,500 (250 shares × $150)

Sell immediately: After federal withholding (22% supplemental), payroll taxes (7.65%), and California (10.23% supplemental), the employee nets roughly $22,500. Clean, low risk, no surprises.

Hold all: Full exposure to the stock. If the stock goes up 20%, the position is worth $45,000. If it drops 20%, it's $30,000 — but you still owe taxes on the $37,500 vest value. And your salary, unvested RSUs, and now your cash are all tied to the same company. The tool flags this as a concentration risk.

Sell half, hold half: Net about $11,250 in cash, keep $18,750 in stock. Better diversification, still some upside.

The tool doesn't tell you which strategy is "right" — it shows you the math and tradeoffs, then lets you decide based on your personal situation. That's the kind of analysis a robo-advisor can't do and a human advisor charges $300/hour for.

Why Nobody Gives You This Analysis

Most financial advisors don't understand equity compensation well enough to model it properly. They'll tell you to "diversify" without running the tax math. Your HR department tells you the mechanics of vesting but won't touch strategy. Your co-workers give you advice based on what worked for them in a different market.

Alistair runs all four strategies against your actual numbers — no judgment, no bias, no AUM sales pitch.

That's what this microtool does. Don't guess with your equity. Run the numbers.