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No tax treaty, a Costa Rica-specific line item (CAJA) that doesn't exist anywhere else on this hub, and three worked scenarios.
The US and Costa Rica have no bilateral income tax treaty, a genuinely different starting point than Portugal or most of Europe. It changes how the numbers actually work, not just the paperwork.
No treaty, and what that actually means in practice
- No treaty exists. There's no bilateral agreement to lean on for double-taxation relief between the two countries.
- Costa Rica's side is simpler than it sounds. Costa Rica taxes on a territorial basis, meaning income sourced outside Costa Rica, including US Social Security, US pensions, and US investment income, generally isn't taxed by Costa Rica at all. This is the detail that makes the "no treaty" headline sound scarier than the practical reality for most retirees living on US-sourced retirement income.
- The US side doesn't go away. US citizens owe US tax on worldwide income regardless of residency, and the Foreign Earned Income Exclusion only applies to earned income (wages, self-employment), not Social Security, pensions, or investment income, which is what most retirees actually live on. The Foreign Tax Credit becomes the more relevant tool for retirees who do end up paying any Costa Rican tax on Costa Rica-sourced income.
Banking as a US citizen
- FATCA reporting is real. Costa Rican banks report US account holder information to the IRS, and some smaller or more conservative banks are cautious about onboarding US citizens at all because of the compliance overhead, the same pattern American retirees run into in several countries on this hub, not unique to Costa Rica but still worth planning around.
- Banks that work with Americans: BAC Credomatic and Scotiabank Costa Rica are commonly cited as workable for US citizens, including for residents seeking financing. Expect "know your client" documentation and periodic re-verification as an ongoing part of the relationship, not a one-time hurdle.
- FBAR doesn't disappear. Foreign account balances over $10,000 combined trigger FBAR filing, and Form 8938 kicks in at higher asset thresholds. These obligations continue regardless of residency status.
The recurring cost that doesn't exist on most of this hub's other country pages
CAJA's income-based structure means your healthcare cost isn't a fixed line item you can lock in once, it moves with what you declare, and it's mandatory rather than optional the way a private-insurance-only country lets you treat healthcare as a discretionary spend.
Worked scenarios
Scenario A
Single, Social Security only, Pensionado
Annual income$28,800 SS ($2,400/mo)
Est. US tax$0
Est. Costa Rica tax$0 (foreign-sourced, territorial system)
CAJA (declaring ~$2,400/mo)~$170–$260/mo
Under the standard US deduction; Costa Rica doesn't tax the foreign-sourced Social Security at all. CAJA is the real recurring cost here.
Scenario B
Couple, SS + IRA withdrawal, Rentista
Annual income$60K SS + $40K IRA
Est. US tax~$6,800
Est. Costa Rica tax$0 (both sources US-sourced/foreign)
CAJA (declaring ~$8,300/mo combined)~$580–$910/mo
No treaty relief needed because Costa Rica doesn't tax foreign-sourced income in the first place. The US bill is the whole story on taxes, but CAJA scales up meaningfully with declared income at this level.
Scenario C
Couple, SS + US rental income
Annual income$50K SS + $25K rental
Est. US tax~$3,100
Est. Costa Rica tax$0 (US rental is US-sourced, not taxed by CR)
US rental income keeps a US filing obligation alive, same as everywhere else on this hub, but Costa Rica's territorial system means it isn't double-taxed on the Costa Rica side.
Why "no tax treaty" scares people more than it shouldFor retirees living on Social Security, pensions and US investment income, the practical tax picture in Costa Rica is often simpler than in treaty countries, precisely because Costa Rica's territorial system leaves foreign-sourced retirement income alone. Where it gets genuinely complicated is Costa Rica-sourced income (a local rental, local business, or CAJA-adjacent employment income), that's the scenario worth a cross-border preparer's time, not the baseline retiree case above.
Illustrative 2026 estimates. Not tax advice, confirm your numbers with a cross-border CPA familiar with Costa Rica's territorial tax system specifically.