The 0% capital gains rate under Act 60 Chapter 2 is the single most powerful tax benefit available to US citizens. But it does not apply retroactively. The US government will not let you move to Puerto Rico and erase tax on gains that accumulated while you were a mainland resident.
The 10-year lookback rule is the mechanism that splits the difference: it determines which gains are US-source (and taxed at mainland rates) and which are Puerto Rico-source (and taxed at 0%). Understanding this rule is essential for timing your move and your asset sales.
How Capital Gains Work Under Act 60
Under Chapter 2 of Act 60, a bona fide resident of Puerto Rico pays 0% tax on Puerto Rico-source capital gains. The question is: what makes a gain "Puerto Rico-source"?
For assets sold while you are a bona fide PR resident, the gain is split:
- Pre-move appreciation — the increase in value that occurred before you established bona fide residency — remains subject to US federal capital gains tax (20% + 3.8% NIIT).
- Post-move appreciation — the increase in value that occurred after you established bona fide residency — is Puerto Rico-source and taxed at 0%.
This split applies to every asset you hold. Stocks, bonds, real estate, private company interests, cryptocurrency — all are subject to the lookback rule.
The 10-Year Cliff: When Everything Becomes PR-Source
Here is where it gets powerful. After you have been a bona fide resident of Puerto Rico for 10 continuous years, all gains on your assets become Puerto Rico-source — including the pre-move appreciation that was previously US-taxed.
This means that if you hold an asset for 10+ years after moving, the entire gain from the original purchase date qualifies for 0% tax. The lookback rule effectively expires after a decade of continuous residency.
Example: $1M in Stock Appreciation
You bought stock for $200,000. By the time you move to Puerto Rico, it has appreciated to $600,000 (a $400,000 pre-move gain).
Year 3 after move: You sell the stock for $1,200,000. Total gain: $1,000,000.
- Pre-move gain ($400,000): taxed at US rate (~23.8%) = $95,200
- Post-move gain ($600,000): taxed at PR rate (0%) = $0
- Total tax: $95,200. Total savings vs. mainland: $142,800.
Year 11 after move: You sell the same stock for $1,200,000. Total gain: $1,000,000.
- Entire gain ($1,000,000): Puerto Rico-source, taxed at 0% = $0
- Total tax: $0. Total savings vs. mainland: $238,000.
Difference between selling at year 3 vs. year 11: $95,200 in additional tax savings — purely from holding the asset past the 10-year mark.
Marketable Securities vs. Non-Marketable Assets
The lookback rule applies differently depending on the type of asset:
Marketable Securities (Stocks, Bonds, ETFs)
The split is based on the change in value from your move date to the sale date. Pre-move appreciation = value at move date minus original cost basis. Post-move appreciation = sale price minus value at move date.
This is straightforward to calculate: you need the fair market value of each security on the date you established bona fide residency. Your brokerage statements from that date serve as documentation.
Non-Marketable Assets (Real Estate, Private Company Interests)
For assets without a readily ascertainable market value, the IRS uses a days-of-ownership allocation method. The total gain is prorated based on the number of days you owned the asset before vs. after your move.
Example: Real Estate
You bought a property for $500,000 and owned it for 2,000 days before moving to Puerto Rico. You sell it 1,000 days after moving for $1,100,000 (a $600,000 total gain).
- Total ownership days: 3,000
- Pre-move days: 2,000 (66.7%)
- Post-move days: 1,000 (33.3%)
- US-taxed gain: $400,000 (66.7% of $600,000)
- PR-source gain: $200,000 (33.3% of $600,000)
- Tax: $95,200 (US) + $0 (PR) = $95,200
After 10 years of residency, the entire $600,000 would be PR-source — $0 tax.
Strategic Timing of Asset Sales
The lookback rule creates clear strategic implications for when you sell assets:
| Strategy | When to Sell | Tax Result |
|---|---|---|
| Hold past 10-year mark | Year 11+ | 0% on entire gain |
| Sell before 10-year mark | Years 1-10 | 0% on post-move gain, US rate on pre-move gain |
| Sell immediately after move | Year 1 | Mostly US-taxed (minimal post-move appreciation) |
| Acquire new assets after move | Anytime | 0% on entire gain from day one |
The most powerful strategy: new acquisitions made after establishing residency qualify for 0% from day one. If you buy a stock, a property, or a crypto asset after your bona fide residency date, the entire gain is PR-source regardless of when you sell. There is no lookback for post-move purchases.
This means the optimal approach is often: move to Puerto Rico, then invest. Pre-existing positions benefit from the 10-year hold strategy. New positions benefit immediately.
The December 31, 2026 Deadline
There is an additional urgency layered on top of the lookback rule. Applications filed before December 31, 2026 are grandfathered at 0% on passive income (capital gains, dividends, interest). Applications filed after this date receive a 4% rate — still favorable, but not zero.
This deadline interacts with the lookback rule directly: if you move and file before the deadline, your post-move appreciation is taxed at 0%. If you file after, your post-move appreciation is taxed at 4%. The difference on $5M in post-move gains is $200,000.
See our detailed analysis of the December 2026 deadline for what you need to prepare before the window closes.
Time Your Move Strategically
The lookback rule rewards patience and punishes haste. We help clients build a strategic timeline for their move, their asset sales, and their new acquisitions.
Schedule a ConsultationKey Takeaways
- Pre-move appreciation stays US-taxed (23.8%); post-move appreciation is PR-source (0%).
- After 10 years of continuous bona fide residency, ALL gains become PR-source — including pre-move.
- Marketable securities use value-at-move-date; non-marketable assets use days-of-ownership allocation.
- New assets purchased after your move date qualify for 0% from day one — no lookback.
- The December 2026 deadline determines whether your post-move gains are 0% or 4%.
For the complete Act 60 framework, read our complete guide. For the dollar impact, see our mainland vs. Act 60 comparison.