RSU, ESPP & ISO Taxes: 5 Worked Examples, Step by Step

Michael: Welcome to the TaxMyVest.com step-by-step guide. Instead of just showing you calculators, we're going to work through real examples, together. From the day your shares vest, all the way to your tax return.

Amy: How is the guide organized?

Michael: Each section is one example, with the numbers on screen. Follow along me, then run your own numbers on the site.

Amy: What will I know by the end?

Michael: By the end, you'll know exactly what you owe, what was already withheld, and what to do about the difference.

Amy: Oh, Great! Let's start with RSU?

Michael: Example one: RSU. Say, two hundred shares vest at one hundred fifty dollars each. Vesting means they become officially yours — and on that day, their full value counts as your income.

Amy: How much new income is that?

Michael: Two hundred times one hundred fifty is thirty thousand dollars of new income, added to your salary.

Amy: so my employer withholds taxes on this income? How much does my employer withhold?

Michael: Your employer withholds a flat twenty-two percent. Twenty-two percent of thirty thousand becomes six thousand six hundred dollars.

Amy: so, What's the catch?

Michael: If your marginal rate, for example — your real tax rate on each extra dollar — is thirty-two percent, your actual tax is thirty-two percent of thirty thousand. That's extra nine thousand six hundred dollars. Six thousand six hundred was withheld. Nine thousand six hundred is owed. You're still short about three thousand dollars. That gap is the twenty-two percent trap. The RSU calculator runs this exact math for your state and your bracket.

Michael: Example two: ESPP. Your employee stock purchase plan lets you buy shares at a discount. Say you buy one hundred shares at eighty-five dollars each. The market price is one hundred dollars.

Amy: What's the discount worth?

Michael: You got a fifteen dollar discount per share — one thousand five hundred dollars total.

Amy: Now, what happens when I sell?

Michael: If you sell right away, it's called a disqualifying disposition. You sold too early. The full one thousand five hundred dollar discount is taxed as ordinary income — like salary.

Amy: And if I wait?

Michael: Wait two years from when the offer started, and one year from when you bought, and it's a qualifying disposition. Say the stock is now at one hundred twenty dollars. Your total profit is three thousand five hundred dollars. Only the one thousand five hundred dollar discount is ordinary income. The other two thousand is a long-term capital gain — profit from something you held, taxed at lower rates. Same shares. Very different tax bill.

Michael: Example three: sell versus hold. Suppose shares you've held have grown, and selling today would lock in a twenty thousand dollar gain. Normally, you'd owe tax on that gain.

Amy: What if I sold some stocks at a loss a few years ago?

Michael: Those are capital losses — and they don't disappear. They carry forward, year after year, until used. Capital losses cancel out capital gains, dollar for dollar. So twenty thousand dollars of gain, minus twenty thousand dollars of carried-over losses, equals zero taxable gain. You'd owe no tax on this sale.

Amy: And what, if my losses are bigger than my gains?

Michael: You can deduct up to three thousand dollars against your regular salary income each year, and carry the rest forward again. The calculator factors in your losses automatically.

Michael: Example four: quarterly estimated tax. The IRS charges a penalty if you owe too much when you file — unless you meet a safe harbor. A safe harbor is simply a payment rule that protects you from the penalty.

Amy: What's the most common safe harbor?

Michael: The most common one: pay at least one hundred ten percent of last year's total tax during the year.

Amy: can you explain with an example for me?

Michael: One hundred ten percent of last year's tax comes to fifty-five thousand dollars. That's your target. Now suppose your paycheck withholding and any payments so far add up to forty thousand and ten dollars. Fifty-five thousand minus forty thousand and ten leaves fourteen thousand nine hundred ninety dollars still to pay.

Amy: How does the IRS want that paid?

Michael: The IRS wants it in four installments: April, June, September, and January. Fourteen thousand nine hundred ninety divided by four is about three thousand seven hundred forty-seven dollars and fifty cents per quarter. The calculator does all of this for you.

Michael: Example five: incentive stock options — ISOs. Remember, an option is the right to buy shares at a fixed strike price. Using this right in the stock market is called exercising.

Amy: Can we run an example?

Michael: Say you exercise one thousand ISO. Your strike price is ten dollars. The market price is twenty-six. That sixteen dollar gap, times one thousand shares, is sixteen thousand dollars. Under the alternative minimum tax — AMT, a parallel tax system — that sixteen thousand counts as your income, the moment you exercise. Even though you haven't sold a single share. That's how people get surprise five-figure tax bills.

Amy: When is it a qualifying disposition?

Michael: If you hold the shares at least one year after exercising, and two years after the options were granted, it's a qualifying disposition. Your profit is taxed as a long-term capital gain.

Amy: And if I sell in the same year I exercise?

Michael: Sell in the same year you exercise, and it's disqualifying — the profit becomes ordinary income, and the AMT adjustment drops to zero. The calculator estimates your AMT before you exercise, so there are no surprises.

Michael: Quick check. Your RSU vest at thirty thousand dollars. Your employer withholds twenty-two percent, but your marginal rate is thirty-two percent.

Amy: How much do you still owe?

Michael: Pause the video. Drop your answer in the comments section.

Amy: What if my numbers are different?

Michael: Those are five real examples — but your numbers will be different. Run them free at TaxMyVest.com. No signup needed. Link is in the description.

Amy: Thanks for watching!

Michael: Take care.

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