HSA Calculator: Project a Health Savings Account Balance
Project how a health savings account could grow when contributions are invested and left to compound rather than spent each year.
Adjust the inputs and select Calculate for a full breakdown.
Year-by-year growth schedule
Compare Common Scenarios
How the numbers shift across typical situations for this calculator:
| Scenario | Future value | Total contributions | Total interest earned |
|---|---|---|---|
| $3k · $300/mo · 7% · 20yr | $168,394.21 | $75,000.00 | $93,394.21 |
| $0 · $250/mo · 6% · 30yr | $251,128.76 | $90,000.00 | $161,128.76 |
| $15k · $500/mo · 8% · 15yr | $222,622.93 | $105,000.00 | $117,622.93 |
| $8k · $150/mo · 7% · 25yr | $167,314.10 | $53,000.00 | $114,314.10 |
How This Calculator Works
Enter the current HSA balance, the average annual return you expect, the years invested, and your monthly contribution. The calculator compounds the balance monthly and adds each contribution, showing the projected balance and how much of it is investment growth.
The Formula
Future Value with Regular Contributions
P = starting amount, PMT = monthly contribution, r = monthly rate (annual ÷ 12), n = number of months
Worked Example
With $3,000 invested, $300 added monthly, and a 7% average return over 20 years, the HSA reaches about $168,400. Contributions make up $75,000 of that, and investment growth supplies the other $93,400.
Key Insight
An HSA is uniquely tax-advantaged: contributions, growth, and qualified medical withdrawals are all untaxed. Paying smaller medical bills out of pocket and leaving the HSA invested turns it into a powerful long-term account.
Frequently Asked Questions
What is a health savings account?
An HSA is a tax-advantaged account paired with a high-deductible health plan. It is used for medical costs, but the balance can also be invested and carried forward indefinitely.
Why is an HSA called triple tax-advantaged?
Contributions are pre-tax, investment growth is untaxed, and withdrawals for qualified medical expenses are tax-free. Few accounts offer all three at once.
Should I invest my HSA or keep it in cash?
Many HSAs let the balance above a threshold be invested. Investing suits money you do not expect to spend soon; near-term medical costs are better left in cash.
Is there a contribution limit?
Yes. The IRS sets an annual HSA contribution limit, with a higher cap for those 55 and older. Keep your monthly contribution within one-twelfth of the applicable limit.
What happens to the HSA in retirement?
After age 65, non-medical withdrawals are taxed as income without penalty, and medical withdrawals stay tax-free — so an invested HSA works much like a flexible retirement account.
Related Calculators
Data Sources & Benchmarks
This calculator draws on 3 independent, dated sources. The starting values for expected annual return are taken from the benchmarks below and refresh whenever the snapshots are updated.
Methodology & Review
The projection compounds the balance monthly at a constant expected return and adds a fixed monthly contribution. It excludes account fees and assumes contributions stay within annual IRS limits.
Written by Ugo Candido · Last updated May 17, 2026.