How does your purchasing power actually change? Here's the real breakdown — after taxes, after cost of living.
What the numbers mean
A $75,000 salary in Boston gives you the equivalent of $43,981 in purchasing power after accounting for state income taxes (5.0%) and the local cost of living. The same salary in Miami gives you $60,976 — a difference of +39%.
Median rent in Miami runs about $2,100/month — roughly $700/month less than Boston's $2,800. That's $8,400/year back in your pocket before you factor in anything else.
No state income tax in Miami. On a $75,000 salary, that's roughly $3,750/year you keep that you wouldn't in Boston.
These numbers use a cost-of-living index where 100 = national average. Boston's index of 162 means it costs 162% of the national average to maintain the same lifestyle. Miami's is 123.
Boston to Miami in real terms
This is a move that comes up a lot, partly because Boston's cost of living has crept up enough that it's now one of the most expensive metros in the country, and partly because Miami specifically has been pulling Northeast money for a few years now. The math above is real, but Boston-to-Miami has some specifics worth thinking about that the index can't capture.
Boston's tax bite is bigger than people realize. Massachusetts has a flat 5.0% income tax, plus a 4% surcharge on income over $1 million (the Millionaire's Tax, in effect since 2023). On a $75,000 salary, the state tax line is roughly $3,750. Florida's is zero. That gap is the bulk of the purchasing-power win above, and it's permanent — it shows up in your bank account every two weeks for as long as you live there.
Boston rent is finally where NYC rent has been. Median 1-bedroom rent in walkable Boston neighborhoods (Back Bay, South End, Cambridge, JP, Brookline) ranges from $2,500 to $3,400. Miami's equivalent neighborhoods (Brickell, Coconut Grove, Coral Gables) run $2,000 to $2,800. So you save real money on rent, but less than the headline numbers suggest because Miami rent has been climbing fast. The gap was $1,000+/month in 2018; now it's closer to $400-$700 in directly comparable neighborhoods.
Insurance is the asterisk. Florida's homeowners insurance crisis is real and ongoing, and even renters feel it indirectly through rents. Average Florida homeowner premiums have tripled in five years. Miami-Dade is among the hardest-hit counties. If you're buying, plan on $4,000-$9,000 a year for homeowners insurance, plus separate flood coverage if you're in a flood zone. If you're renting, the insurance pass-through is part of why Miami rents climbed so quickly. Boston's insurance market is dramatically more stable.
The condo problem. If you're considering buying a Miami condo, the post-Surfside recertification rules have led to large special assessments on older buildings. A condo with $400 monthly HOA fees on Zillow may have just received a $30,000 special assessment that the listing won't always disclose. Talk to current residents before any purchase, and budget for the possibility.
Climate is more than weather. Boston winters are objectively bad — gray, cold, wet, snowy. Many Bostonians lose three months of usable outdoor life every year. Miami winters are excellent, with daytime highs in the 70s and low 80s and almost no rain. The flip is real: Miami summers run May through October with high humidity and afternoon thunderstorms; hurricane season threats reshape your September every year. Boston summers are short but mostly pleasant. The cumulative weather quality is probably better in Miami if you're a person who values outdoor time, but it's a different distribution, not strictly an upgrade.
The cultural trade. Boston has world-class universities, hospitals, museums, walkable neighborhoods, and a deep historical fabric. Miami has a different (and now genuinely competitive) food scene, ocean access, multilingual everyday life, and a level of nightlife and outdoor cafe culture Boston doesn't really attempt. People who love Boston tend to love it specifically; people who love Miami tend to love it differently. Both cities have people who love them and people who can't wait to leave.
Career considerations. Boston's tech, finance, biotech, and academic sectors are deep. If you work in any of those and want flexibility to switch jobs, you'll feel the difference. Miami's finance scene has grown a lot since 2020 (the Citadel relocation, hedge fund migration, etc.) but it's still smaller and more concentrated. Tech in Miami is real but smaller than Boston. Healthcare and law are similar in both cities. Knowing which industry you're in matters more than the COL math, longer term.
If you're a Bostonian who's tired of winter, has a portable job, and wants to keep more of your paycheck, Miami is one of the best moves in the country on the math. The risks are weather-driven and insurance-driven, both of which are real but plannable.
Run your actual numbers
The comparison above uses $75,000 as a baseline. Your real result depends on your salary, your job type, and whether your employer adjusts pay for location. The tool below lets you enter your specific situation.