Last updated October 5, 2026 · Report an error
A Health Savings Account (HSA) isn't just a place to stash money for medical bills — when invested, it can grow substantially over time thanks to compound growth, on top of its unique triple tax advantage.
This calculator projects your HSA balance forward based on your current balance, monthly contributions, and an expected annual investment return.
How it works
Enter your current HSA balance, planned monthly contribution, expected annual return, and the number of years to project forward. The calculator compounds both your existing balance and your ongoing contributions monthly to project the future value.
- Enter current HSA balance ($).
- Enter monthly contribution ($).
- Enter expected annual return (%).
- Enter years to grow.
- Click Calculate to see your results.
Examples
Growing a $5,000 HSA over 20 years
Starting with a $5,000 balance, contributing $300/month, and earning a 6% annual return, an HSA grows to about $155,163 after 20 years — with $77,000 of that from contributions and the rest from investment growth.
Who should use it
- Projecting how much an HSA could grow to by retirement if invested consistently.
- Comparing the growth impact of different monthly contribution amounts.
Industry applications
- Personal finance and retirement planning
- Employee benefits and financial wellness programs
Advantages
- Separately reports total contributed versus investment growth for clarity.
- Compounds both the existing balance and ongoing contributions monthly for accuracy.
Limitations
- Doesn't account for HSA-specific contribution limits, fees, or withdrawals for medical expenses along the way.
Common mistakes to avoid
- Assuming HSA funds sit in cash earning nothing — many providers allow investing the balance once it exceeds a minimum threshold, which is required for compound growth like this projection shows.
- Using an unrealistically high expected return that doesn't reflect your actual investment allocation.
Best practices
- Use a conservative, realistic expected return based on your actual HSA investment allocation, not an optimistic best-case assumption.
Tips
- Many people use their HSA as a stealth retirement account — paying medical expenses out-of-pocket now and letting the HSA balance grow tax-free for decades, since there's no requirement to withdraw funds by a certain age.