RSU vs Stock Options: After-Tax Value Compared for 2026

RSUs and stock options are taxed under three different regimes, not two. An RSU is ordinary income on its full value the day it vests, with nothing to pay and nothing to decide. A nonqualified stock option is ordinary income on the spread the day you exercise, which is the same tax treatment, so choosing between RSUs and NSOs is a question about leverage rather than about tax. Only an incentive stock option is genuinely different: IRS Publication 525 says you "don't include any amount in income when you exercise the option," and if you hold long enough the entire gain from the strike price upward becomes long-term capital gain. In the worked example below that single distinction is worth $19,440 on the same $120,000 spread. The catch is that the ISO spread is an alternative minimum tax adjustment, and you have to fund the exercise yourself.

Comp packages are usually presented as one number. A recruiter says "$60,000 of equity a year" and does not say whether that is 1,000 RSUs or 4,000 options, which are not remotely the same thing. This is what each one is actually worth after tax, using the 2026 federal rates and the rules straight out of IRS Publication 525.

This is educational. We build index construction and backtesting software. We do not manage money, hold accounts, or give tax advice.

What is the difference between RSUs and stock options?

An RSU is a promise to deliver shares once you have worked long enough to earn them. You pay nothing and you receive stock. A stock option is the right to buy shares at a fixed price, the strike, which is normally the market price on the day it was granted. You pay the strike and you receive stock, so an option is only worth something if the price rises above the strike. That single structural difference drives everything else.

Source: IRS Publication 525, "Taxable and Nontaxable Income" (2025), the Statutory Stock Options and Restricted Property sections.

How are RSUs taxed compared to stock options?

For RSUs, Publication 525 is short about it: when the property becomes substantially vested "you must include its FMV, minus any amount you paid for it, in your income for that year." Since you paid nothing, the whole value is wage income, it lands in box 1 of your W-2, and it carries Social Security and Medicare tax the same way salary does. Our RSU tax calculator stacks a vest on top of your salary and prices what it costs at your real bracket, which is usually well above the flat 22% your employer withholds.

A nonqualified option produces the same kind of income at a different moment. Exercise it and the spread between the market price and what you paid is ordinary wage income, withheld and reported on your W-2 just like a vest. Nothing about the tax treatment is more favorable than an RSU. The money you keep depends only on how many shares the grant covers and where the price went.

That is the part most comparison articles get backwards. If your choice is between RSUs and NSOs, tax is not the deciding factor, because both are taxed as ordinary income on the value you receive. The real question is how much leverage you want and how much you believe the price will rise.

Which is worth more, RSUs or options?

Take a company trading at $30 and a grant of either 1,000 RSUs or 4,000 options struck at $30, roughly the ratio employers use when they offer a choice. Assume a single filer already in the 35% bracket, long-term capital gains at 15% plus the 3.8% net investment income tax, and that the shares are sold as soon as they are available.

Because both are taxed at the same ordinary rate, the break-even is pure arithmetic and the tax rate cancels out entirely: 1,000 shares are worth more than 4,000 spreads until the price reaches $40, which is a third above the grant price. Below that the RSUs win, and at any price at or under the strike the options are worth exactly nothing while the RSUs are still worth real money. Above $40 the options pull away fast.

So the honest framing is that RSUs are compensation and options are a bet placed with your own career. A four-year option grant at a company whose price never recovers its grant-day level pays you nothing at all, which happens to plenty of good companies in a flat market.

RSU vs ISO: what the alternative minimum tax actually does

Incentive stock options are the only one of the three with a genuine tax advantage, and it is large. Publication 525: "If you receive a statutory stock option, don't include any amount in your income when the option is granted," and "If you exercise a statutory stock option, don't include any amount in income when you exercise the option." No wage income, no withholding. If you then hold long enough, the whole gain from the strike price up to the sale price is a long-term capital gain.

Long enough means two clocks at once. You satisfy the holding period requirement "if you don't sell the stock until the end of the later of the 1-year period after the stock was transferred to you or the 2-year period after the option was granted." Miss either and it is a disqualifying disposition, and the spread at exercise reverts to ordinary income.

Add the ISO to the earlier example. Same 4,000 options at a $30 strike, exercised when the stock is still at $30 so there is no spread, sold later at $60 with both clocks satisfied.

The ISO beats the identical NSO by $19,440, and every dollar of that is the gap between the 35% ordinary rate and the 18.8% long-term rate applied to the same $120,000 spread. Nothing else changed.

The price of that advantage is the alternative minimum tax. Publication 525: "For the AMT, you must treat stock acquired through the exercise of an ISO as if no special treatment applied," and you "must include as an adjustment in figuring alternative minimum taxable income the amount by which the FMV of the stock exceeds the option price. Enter this adjustment on Form 6251, line 2i." Exercise when the stock has already run up and you can owe a large cash tax bill on paper gains you have not sold, in the same year, with no withholding to cover it. There is one clean escape written into the same paragraph: "no adjustment is required if you dispose of the stock in the same year you exercise the option." Exercise and sell together and the AMT problem disappears, but so does the long-term treatment.

The IRS gives its own worked example of getting the clocks wrong. In Example 8 of Publication 525, an ISO is granted on March 12, 2023 at $10, exercised on January 7, 2024 at $12, and sold on January 27, 2025 at $15. The shares were held more than a year, but "less than 2 years had passed from the time you were granted the option." The result is a $500 total gain split into $200 of wages and $300 of capital gain. One missed clock, on a modest position, and nearly half the profit changed rate.

What happens if the stock falls after vesting?

This is where RSUs bite and options do not. The ordinary income on an RSU is fixed on the vest date. If the stock halves the week after, you still owe tax on the vest-date value, and the decline is only a capital loss, usable against capital gains and then against just $3,000 a year of ordinary income. People have owed six-figure bills on shares worth a fraction of that by April.

An option that goes underwater simply expires unexercised. You lose the upside but you never owed anything, because there was no taxable event. That asymmetry is the strongest argument for taking options over RSUs at an early-stage company, and the strongest argument for selling RSUs at vest at a public one.

How do I compare a job offer with RSUs against one with options?

Convert both to an after-tax number at a price you actually believe, not the price in the recruiter's spreadsheet. Three things to pin down before you can do that: the strike price and the current fair market value, the total share count rather than a dollar figure the company assigned, and the vesting schedule including any cliff. A dollar value quoted for an option grant is meaningless without the strike, because it is usually the notional value of the shares rather than the spread you would actually keep.

Then treat the equity line as the negotiable one. Base salary is often boxed in by a band, while share counts, refresh grants and cliff terms have far more give in them, and it is worth working out what to push back on before you sign rather than after. Ask for the grant in shares, ask whether options are ISOs or NSOs, and ask what happens to unvested equity if you leave, because that answer varies enormously between companies and is rarely volunteered.

One more number worth running: how much of your net worth the package will represent in four years if you never sell. The answer to how much of your portfolio should be in one stock is almost always lower than what a full vesting schedule produces on its own.

The cost basis trap that applies to all three

Whatever instrument you hold, the broker will probably misreport your basis when you sell, and it costs real money. Publication 525 states it plainly: "For options granted on or after January 1, 2014, the basis information reported to you on Form 1099-B won't reflect any amount you included in income upon grant or exercise of the option." Then the warning that matters: "It's your responsibility to make any appropriate adjustments to the basis information reported on Form 1099-B by completing Form 8949."

For RSUs the reported basis is often zero, because you paid nothing out of pocket. For an exercised option it is often just the strike price, which ignores the spread already taxed as wages. Either way the gain is overstated and you pay tax a second time on income already on your W-2 unless you correct it. Your plan administrator's supplemental statement, not the 1099-B, normally carries the right figure. If you have several vests or exercises stacked up, each one is its own lot with its own basis and holding period, and the cost basis calculator shows how much the choice of lot changes the bill.

What to do with the shares once you own them

The tax question ends the moment you hold the stock. What starts is a concentration question, and it is the one that does most of the damage over a career. Every route out of a large single holding has a cost, whether that is capital gains tax on a staged sale, the fee on an exchange fund with its seven-year lock-up, or the ongoing charge on direct indexing around a concentrated position.

The cheapest version is the one you set up in advance. Decide the target weights while the position is still small, treat each vest or exercise as a scheduled rebalancing date rather than a fresh judgment about your employer, and sell into the allocation you already chose. Shares sold at vest carry almost no embedded gain, so that rebalancing is nearly free. Wait until the position has tripled and every correction costs capital gains tax. Building the target as an explicit custom index makes the decision mechanical instead of an argument you have with yourself four times a year.