How can an HSA become a powerful retirement account?

A health savings account is the only account with a triple tax advantage: contributions are deductible, growth is tax-free, and withdrawals for qualified medical expenses are tax-free. If you can pay current medical bills out of pocket and let the HSA grow invested for decades, it becomes a dedicated tax-free fund for the large healthcare costs that come in retirement. The 2025 limits are $4,300 for self-only and $8,550 for family coverage, plus a $1,000 catch-up at 55. A bonus: you can save receipts for years and reimburse yourself anytime. After 65, non-medical withdrawals are taxed like a traditional IRA with no penalty, so a worst case still works like a regular retirement account. Note you can't contribute once you enroll in Medicare, so plan your final contribution year carefully.