Stock options and RSUs are quiet for years and then, at retirement, they suddenly ask for decisions. Grants that took a decade to vest become choices with deadlines, and the tax result of each choice depends on which kind of award you are holding. Three instruments cover most of what professionals in Puerto Rico receive: restricted stock units, nonqualified stock options, and incentive stock options. Each runs on its own clock.
Restricted stock units are taxed when they vest. Nonqualified options are taxed when you exercise them. Incentive options may avoid regular tax at exercise but can trigger the alternative minimum tax, and they can lose their special status if you wait too long after leaving. Your plan’s retirement language then decides which of those clocks keeps running after your last day, and which one stops.
This guide takes the three instruments one at a time, then adds the Puerto Rico layer that mainland articles leave out: where you worked while the grants were earning value, how the island treats qualified options, and why a decree under Act 60 does not turn paychecks into passive income. The goal is a plan you can write down before the exit paperwork arrives.
Clock One: RSUs Tax You When They Vest, Not When You Sell
Restricted stock units are the simplest instrument to understand and the easiest to underestimate, because the tax arrives before you have decided anything.
What Happens at Vesting
When RSUs vest, the fair market value of the shares on that date is ordinary wage income, and payroll taxes apply as well. Only growth after the vest date is a capital gain, and a decline after vesting is a capital loss measured from the vest-date value, according to this 2026 comparison of ISOs and RSUs. Employers typically withhold federal income tax at the flat supplemental rate of 22%, rising to 37% on supplemental wages above $1 million in a calendar year, and that flat rate applies regardless of your actual bracket, according to this 2026 guide to bonus, RSU, and severance taxes. Many employers collect the withholding by selling a portion of the shares at vesting.
The practical risk is a shortfall. A retiree whose total income places the vest in the 32% or 35% bracket will find that 22% withheld does not cover the tax, and the difference is due when the return is filed or through estimated payments.
A Worked Example of the Withholding Gap
Imagine 1,000 units vesting when the stock trades at $150, creating $150,000 of wage income. Withholding at the flat 22% takes $33,000. If the vest sits in the 32% bracket, the federal income tax is $48,000, which leaves about $15,000 unpaid before any effect from the Additional Medicare Tax. That gap can be closed with extra withholding on remaining paychecks, an estimated payment, or by meeting a safe harbor, which is 100% of last year’s tax or 110% when prior-year adjusted gross income exceeded $150,000. The figures are illustrations, not a forecast, but the pattern is common enough to plan for.
What Retirement Does to Unvested RSUs
Unvested units are governed by the award agreement, and plans differ widely. Some forfeit unvested units when employment ends. Others let retirement-eligible employees keep vesting on the original schedule or accelerate vesting in full or in part. Plans that treat retirement as a favorable departure commonly set age and service thresholds, so someone just short of a threshold can end up with a very different result from a colleague just past it. Payroll tax timing can also arrive earlier for retirement-eligible awards, so ask the plan administrator how withholding will be handled.
Questions to Put in Writing Before Your Last Day
A short list of questions, answered in writing by the plan administrator, removes most of the guesswork:
- Do unvested units continue to vest after retirement, accelerate, or forfeit?
- What age and years-of-service thresholds define retirement under the plan?
- Does the plan require advance notice of retirement to preserve continued vesting?
- How will taxes be withheld on units that vest after you have left?
Read Also: Tax Planning for a Large One-Time Bonus Before Retirement
Clock Two: Nonqualified Options Tax the Spread When You Exercise
Nonqualified stock options give you control over timing, which is both their advantage and their trap.
The Mechanics
Exercising a nonqualified option creates ordinary wage income equal to the spread, the difference between the market price on the exercise date and your strike price, and payroll taxes apply. The income is taxed whether or not you sell the shares. Exercising 3,000 options with a $12 strike when the stock trades at $40 creates $84,000 of wage income, even if every share is kept. Options typically last ten years from the grant date, but the window after leaving is usually much shorter: most plans allow about 90 days, some allow 30, and plans with retirement provisions may extend the period considerably, according to this July 2026 guide to handling options after leaving a job.
Using the Retirement Years
When a plan gives retirees a long exercise window, the choice of when to exercise becomes a planning tool. Spreading exercises across several tax years can keep each year’s income below key thresholds. A few considerations apply:
- Exercising in tranches can keep income below a bracket boundary or below the Medicare surcharge thresholds, which begin at $109,000 for single filers and $218,000 for joint filers in 2026
- Waiting carries market risk, because an option can lose value or expire worthless if the stock falls below the strike price
- Paying the strike price takes cash, and a cashless exercise reduces the cash needed but also reduces the shares you keep
- Income from an exercise in the year work stops stacks with final pay, so the year after retirement is often a better candidate
Clock Three: Incentive Options and the Three-Month Rule
Incentive stock options offer the best tax treatment on paper and the strictest rules in practice, and retirement is exactly when those rules begin to bite.
What ISOs Offer
Incentive options are not taxed at exercise for regular income tax, and no payroll tax applies to the exercise. The spread, however, counts as an adjustment for the alternative minimum tax. If you hold the shares for more than two years from the grant date and more than one year from exercise, the entire gain qualifies for long-term capital gain treatment. Sell sooner and the sale is a disqualifying disposition, which produces ordinary income on part of the gain.
A Worked Example
Suppose you hold 2,000 incentive options with a $20 strike, and the stock trades at $50 on the day you exercise. The $60,000 spread is not regular income, but it is an adjustment for the alternative minimum tax. If you then meet both holding periods and sell later, the whole gain is long-term capital gain. If instead you exercise four months after your last day, the exercise is treated as nonqualified, the same $60,000 becomes ordinary wage income, and payroll taxes apply. The only thing that changed was the calendar.
Why Retirement Changes the Math
To keep incentive treatment, the Internal Revenue Code requires that options be exercised within three months of leaving employment. An exercise after that window is treated as a nonqualified exercise, with ordinary income on the spread, according to this 2026 guide to post-termination exercise rules. Even a plan that gives you a longer window cannot extend the tax rule, so the extra time protects the options but not the ISO status.
The same guide notes that the 2025 tax law lowered the income at which the alternative minimum tax exemption begins to phase out and doubled the phase-out rate beginning in 2026, so large exercises can reach the minimum tax sooner than in prior years. Run the calculation before you exercise, since the result depends on the spread and on all your other income.
Employee Stock Purchase Plans Stop Too
A plan many professionals forget about ends at the same moment as the paycheck.
What Happens at Separation
Participation in an employee stock purchase plan generally ends when employment ends, so payroll contributions stop and any purchase date that has not yet arrived is usually missed. Shares you already own follow their own holding-period rules, and selling them too early can turn part of the discount into ordinary income. Check the plan’s rules on a final purchase before your last day, since the timing of that purchase can decide whether a discount is captured or lost.
The Puerto Rico Layer Most Equity Guides Skip
Everything above applies to equity holders anywhere in the United States. Puerto Rico adds three questions that rarely appear in national articles.
Where Did You Earn It?
Equity income is generally treated as earned over the period between the grant and the vest or exercise, and it is sourced by where you worked during that period. A professional who spent years on the mainland and moved to Puerto Rico before retiring may therefore owe federal tax on the mainland-sourced portion of an RSU vest or option exercise, even as a bona fide resident, while the island-sourced portion is handled under the island’s rules and the federal exclusion for Puerto Rico income. As a rough illustration, if eight of the ten years between a grant and its vest were worked on the mainland, a large share of the income may be treated as mainland-sourced, and allocations of this kind are often made on a time basis. Retiring does not erase that work history. A professional should allocate the income, because the result can differ sharply from simply treating everything as island income.
Act 60 Is Not a Compensation Shield
A decree under Act 60 focuses on investment income and on gains that accrue after residency begins, with a 0% island rate for decrees applied for through December 31, 2026 and 4% for applications from January 1, 2027. Wages and equity compensation are not passive investment income, so a decree should not be assumed to cover an RSU vest or an option exercise. What can differ is the shares themselves: stock you receive after becoming a resident and hold for appreciation may be treated differently from stock whose value accrued before the move.
Puerto Rico’s Own Rules for Qualified Options
Puerto Rico’s tax law has historically recognized qualified stock options modeled on the federal incentive option rules, which means that whether a plan qualifies for island purposes is a separate question from whether it qualifies federally. Confirm both before exercising, since a plan that qualifies on one side but not the other can produce tax in one jurisdiction and none in the other.
Sequencing Across Years: A Retirement Calendar
With the rules in hand, the planning question becomes when each event should occur.
The Year of Retirement and the Years After
Most professionals face their highest income in the year they stop working, when final pay, any bonus, and equity events overlap. A common sequence follows from that:
- Let RSUs vest on schedule where the plan requires it, and arrange withholding or estimated payments for the shortfall
- Move voluntary events, such as discretionary option exercises, into the lower-income years that follow
- Use the exercise window in full only after modeling the income, the alternative minimum tax for ISOs, and the Medicare thresholds together
- Keep notes on each grant’s strike price, expiration, and retirement terms in one place
Concentration Risk After the Tax Event
Once RSUs vest or options are exercised, holding the shares becomes an investment decision, not a tax one. Keeping a large share of your wealth in your former employer’s stock concentrates risk in a single company whose fortunes no longer depend on your work. Selling shares after vesting generally does not create additional tax beyond any gain since the vest date, which is why many retirees diversify early. A financial investment advisor can help weigh that decision against your overall portfolio, and risk management services in Puerto Rico can quantify how much single-stock exposure the rest of your plan can absorb.
Paperwork to Gather Before Your Last Day
Most equity mistakes at retirement trace back to a document nobody read until the deadline had passed.
The Documents That Answer Most Questions
Collecting these in one folder before separation lets you answer the plan administrator’s questions, and your own, quickly:
- Every award agreement, which states the vesting schedule, the strike price, the expiration, and what retirement does to each grant
- The plan document itself, since it controls any definition of retirement and any post-termination window
- Brokerage statements showing exercised options and shares held, so cost basis can be traced
- Form 3921 for any incentive options you exercised, and Form 3922 for employee stock purchase plan transfers, which report the details needed to calculate gain
- Prior W-2s, where income from nonqualified option exercises is reported, to confirm the amounts match your records
- The most recent estimated tax payments and the safe harbor target for the year
Read Also: Tax-Loss Harvesting in Puerto Rico: When Can It Help?
Turning a Pile of Grants Into a Plan
The simplest way to make sense of equity at retirement is to build a one-page inventory before your last day. For each grant, record the type, the grant and vest dates, the strike price, the expiration, the retirement provision, and the expected withholding. That page tells you which clocks are running and when each stops.
From there, the decisions are mostly about sequence: which events to accept on schedule, which to move into lower-income years, and which require a deadline you cannot miss. The rules differ for RSUs, nonqualified options, and incentive options, but the habit is the same: read the plan before the paperwork arrives, not after.
A tax planning advisor can map each grant to the right tax treatment on both sides of the tax system, and a comprehensive financial analysis can show how equity events interact with Social Security timing, withdrawals, and Medicare costs. Early retirement planning in Puerto Rico work turns the deadlines in this guide into a calendar.
Disclaimer: This article is for educational purposes only and does not constitute individualized financial, tax, or legal advice. Equity plans and tax rules vary, so confirm your plan terms and current federal and Puerto Rico requirements with a licensed professional regarding your specific circumstances.
