HSA vs FSA 2027 Triple Tax Advantage Calculator
Compare HSA and FSA contributions for 2027 — Health Savings Account (HSA: $4,300 self / $8,550 family limit, triple tax-advantaged, rollover forever) vs Flexible Spending Account (FSA: $3,300 limit, use-it-or-lose-it, payroll deduction). The HSA is the more powerful vehicle for those eligible (HDHP enrolled), but FSA fits non-HDHP coverage.
The HSA Triple Tax Advantage
HSA is the ONLY US account with triple tax advantage: (1) Contributions are pre-tax (federal + state + FICA combined ~30-40% savings). (2) Growth is tax-free within the account, including investment gains, dividends, interest. (3) Withdrawals for qualified medical expenses are tax-free. After age 65, non-medical withdrawals are taxed as ordinary income (like a Traditional IRA). The combination makes HSA the most tax-efficient savings vehicle in the US.
2027 Contribution Limits
2027 limits: HSA $4,300 self-only, $8,550 family (proposed — confirm closer to year). FSA $3,300. Catch-up at 55+: extra $1,000 on HSA. HSA limits are individual — both spouses on HDHP family plan combined contribute up to $8,550. FSA is per employee. Limits are indexed annually for inflation by IRS.
FSA: Use-It-or-Lose-It
FSA funds must be used by year end or are forfeit (Federal "use-it-or-lose-it" rule). Some plans offer either a 2.5-month grace period (extends spending to March 15) or a $610 carryover (2024 limit). Cannot use both. Many plans choose carryover for flexibility. FSA reimbursement requires receipts; HSA has more lenient documentation (debit card swipe acceptable).
HSA Investment Strategy
Smart HSA holders pay current medical out-of-pocket (saving receipts) and let HSA invest in low-cost index funds (Vanguard, Fidelity HSA). Reimburse yourself decades later from saved receipts — tax-free withdrawal at any time. Meanwhile the HSA compounds tax-free. A $4,300/year HSA invested at 6% real return over 30 years grows to $360,000+ tax-free, paying retirement medical costs that Medicare doesn't cover.
Sources: irs.gov HSA 2027 limits, healthcare.gov HDHP. Last updated: May 2026.