HSA Calculator: Triple Tax Advantage (US)
Calculate Health Savings Account (HSA) contributions, tax savings, and growth as a stealth retirement account. Triple tax advantage.
Why HSAs Are Special
HSAs uniquely offer TRIPLE tax advantage: (1) Contributions are tax-deductible (or pre-tax via payroll). (2) Growth is tax-free. (3) Withdrawals for qualified medical expenses are tax-free. No other US account offers all three. 401(k) and Traditional IRA: tax-deductible going in, taxed coming out. Roth IRA and Roth 401(k): taxed going in, tax-free coming out. HSA: tax-free both ways. Plus a fourth advantage: contributions via payroll also avoid FICA (Social Security + Medicare) taxes — saving an
2025 Limits and Eligibility
2025 HSA contribution limits: Self-only coverage: $4,300. Family coverage: $8,550. Catch-up at 55+: additional $1,000. Eligibility: must be covered by a High Deductible Health Plan (HDHP). 2025 HDHP definition: deductible at least $1,650 single / $3,300 family; out-of-pocket maximum at most $8,300 single / $16,600 family. Cannot be: enrolled in Medicare, claimed as dependent, have any other non-HDHP coverage (including FSA, except limited-purpose FSA), receiving VA medical benefits in past 3 mon
The Stealth Retirement Account Strategy
Most HSA holders make a strategic mistake — using HSA to pay current medical bills. Sophisticated strategy: pay medical bills out of pocket while working; INVEST the HSA money (Fidelity, Lively, HealthEquity offer investment options); let it compound for 20-40 years tax-free. At age 65, HSA functions like a Traditional IRA — can withdraw for ANY purpose, taxed as ordinary income (no penalty). And for medical expenses, withdrawals remain tax-free forever. A 30-year-old maxing $4,300/year invested
HSA in Retirement
At 65, HSA becomes especially powerful: (1) Tax-free withdrawals for Medicare premiums (Part B, Part D, Medicare Advantage), Medicare deductibles and copays, long-term care insurance premiums. (2) Tax-free for ALL medical expenses (no AGI threshold like medical itemized deduction). (3) Any non-medical withdrawal after 65 taxed as ordinary income — same as Traditional IRA but no 20% penalty. (4) Spouse inherits HSA tax-free, treats as own. (5) Non-spouse heirs: HSA fully taxable in year of death
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