401(k) vs FSA
Last updated July 2026
401(k)
The workhorse employer retirement account with high limits and employer match
Advantages
- High contribution limit ($23,000 individual / $30,500 age 50+ in 2026)
- Employer match is effectively free money
- Reduces taxable income now (traditional) or grows tax-free (Roth)
- Auto-enrollment and payroll deductions make consistency easy
- Long-term compounding in a broad investment lineup
Drawbacks
- Only two tax advantages (pre-tax in and tax-deferred growth for traditional; or after-tax in and tax-free growth for Roth)
- Withdrawals in retirement are taxed as income (traditional)
- 10% penalty for early withdrawals before 59½
- Investment lineup limited to employer plan menu
FSA (Flexible Spending Account)
Pre-tax dollars for this year's medical expenses
Advantages
- Available with any health plan, no HDHP requirement
- Full annual election is available on day one of the plan year
- Reduces taxable income, saving 22-37% depending on your bracket
- Employer may contribute additional funds to your FSA
Drawbacks
- Use it or lose it, most funds expire at end of plan year
- Not portable, forfeit remaining balance when you leave your employer
- Cannot invest FSA funds for growth
- Must estimate medical expenses in advance during open enrollment
- Limited rollover: max $640 carryover or 2.5-month grace period (employer's choice)
401(k) and FSA both play in tax-advantaged health accounts, but they're aimed at different buyers. 401(k) is built for anyone with employer 401(k) access, especially with employer match. FSA is built for employees with predictable annual medical expenses who want to reduce their tax bill this year. Which one fits depends on which of those descriptions sounds more like you.
Feature Comparison
| Feature | 401(k) | FSA (Flexible Spending Account) |
|---|---|---|
| Annual Contribution Limit | $23,000 individual / $30,500 age 50+ (2026) | $3,300 individual (2026) |
| Rollover Rules | Rollover to IRA or new employer 401(k) available | Limited: $640 carryover OR 2.5-month grace period |
| Account Ownership | You own it; portable via rollover | Employer-owned; lost when you leave |
| Tax Advantage | Traditional (pre-tax in) or Roth (tax-free out) | Pre-tax contributions only |
| Eligibility | Available at employers offering a 401(k) | Available with any employer health plan |
| Withdrawal Rules | 10% penalty before 59½; RMDs starting at 73 | Tax-free for qualified medical expenses |
| Investing Options | Yes, employer plan investment menu | No investment options |
| Retirement Use | Full withdrawals in retirement (taxed for traditional) | None, medical expenses only |
401(k) Wins
401(k) takes it overall (9/10 vs 6/10), but FSA is still the sharper pick for employees with predictable annual medical expenses who want to reduce their tax bill this year.
401(k)'s standout strength: High contribution limit ($23,000 individual / $30,500 age 50+ in 2026). Its biggest drawback (only two tax advantages (pre-tax in and tax-deferred growth for traditional; or after-tax in and tax-free growth for Roth)) is easier to live with than FSA's (use it or lose it, most funds expire at end of plan year). FSA isn't out of the running though — its own standout strength is available with any health plan, no HDHP requirement. If you fit the profile of employees with predictable annual medical expenses who want to reduce their tax bill this year, that alone can flip the decision.
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