For the former tax haven: it loses out on capital growth, which means less economic growth.
For the former tax haven: it loses out on capital growth, which means less economic growth.
Take someone with $5MM in investable assets. Using a simplistic 4% rule of thumb, that can generate $200K of income per year. Tax that at 4%, and you have $192K to spend. Tax it at a blended 25% and you have $150K to spend. At that level of income, $3500/month is very much a noticeable difference, IMO. ($16K/mo vs $12.5K/mo spendable.)
Now, consider that $150K/yr living in the mainland US goes farther than $150K/yr on Puerto Rico, and someone with $5MM and eligible for Act22 isn't going to move to PR without Act22.
Peter Schiff's quote in the article sums it up very well, I think: “Who would come to a bankrupt island to pay high income taxes?”
The question is Puerto Rico's motivation/justification/choice to offer Act 22 tax advantages to bring the majority of that $192K of spending onto the island or not.