Project HSA growth as a stealth IRA with triple tax savings: pre-tax contributions, tax-free growth, tax-free medical withdrawals.
FINANCE
Project the long-term value of your Health Savings Account treating it as a "stealth IRA". See triple tax savings, contribution-limit-aware growth, and projected balance at retirement.
HSAs offer a triple tax advantage: pre-tax contributions (federal, state in most states, FICA if payroll-deducted), tax-free investment growth, and tax-free withdrawals for qualified medical expenses at any age. 2026 limits: $4,400 self-only / $8,750 family + $1,000 catch-up at 55+. After age 65 you can withdraw for any reason (taxed as ordinary income like a Traditional IRA, no 10% penalty).
Disclaimer: Estimate using current IRS rules. State tax treatment varies - California and New Jersey tax HSA contributions. Always verify current limits with the IRS.
HSA Calculator (Health Savings Account)
Project the long-term value of your Health Savings Account treating it as a "stealth IRA". See triple tax savings, contribution-limit-aware growth, and inflation-adjusted retirement medical buying power.
2026 limits: $4,400 self / $8,750 family. Add $1,000 catch-up at age 55+.
HSA invested in index funds: ~6-8% long-term. Cash-only HSAs: 0-2%.
Projected HSA Balance at Retirement
$1,061,585
Total Contributed$302,500
Investment Growth$759,085
Lifetime Tax Savings$90,956
Federal + state + FICA savings from pre-tax contributions.
HSA Triple Tax Advantage
1. Contributions are pre-tax (federal, state in most states, and FICA if payroll-deducted).
2. Growth is tax-free year over year.
3. Withdrawals for qualified medical expenses are tax-free at any age.
After Age 65
Withdrawals for non-medical expenses are treated as Traditional IRA distributions: ordinary income tax, no 10% penalty.
Why HSAs Are the Best Tax-Advantaged Account
An HSA is the only US account with a triple tax advantage: contributions reduce taxable income, investment growth is tax-free, and withdrawals for qualified medical expenses are tax-free at any age. No other account matches this. To contribute, you must be enrolled in a high-deductible health plan (HDHP) - 2026 minimum deductibles: $1,650 self / $3,300 family.
The "stealth IRA" strategy: pay current medical expenses out of pocket, save your receipts forever, and let the HSA grow invested in index funds for decades. You can later reimburse yourself tax-free for those receipts at any time. A 30-year-old maxing $4,400/year at 7% return reaches about $445,000 by age 65 - all available tax-free for medical, or taxable-but-penalty-free for anything else.
2026 contribution limits: $4,400 self-only, $8,750 family, plus $1,000 catch-up at 55+. After age 65, you can withdraw for any reason (taxed as ordinary income like a Traditional IRA, no 10% penalty). HSAs do NOT have Required Minimum Distributions, unlike 401(k) and IRA accounts. Always invest the balance once you have a small cash buffer for current medical needs.
Estimate using current IRS rules. State tax treatment varies (CA and NJ tax HSA contributions). Always verify current contribution limits with the IRS.
Calculator information
📋 How to use this calculator
Enter your current age and target retirement age (typical 65 for HSA strategy).
Pick HDHP coverage type: self-only ($4,400 limit in 2026) or family ($8,750 limit).
Enter your current HSA balance, annual employee contribution, and any employer contribution.
Set expected annual investment return - HSA invested in index funds historically returns 6-8%; cash-only HSAs earn 0-2%.
Enter federal marginal bracket, state tax rate, and whether contributions go through payroll (to capture FICA savings).
Result projects HSA balance at retirement plus lifetime tax savings from the triple tax advantage.
🧮 HSA Future Value with Annual Contributions
FV = Balance x (1+r)^n + Annual x [((1+r)^n - 1) / r]
Balance: current HSA balance (USD)
Annual: total annual contribution (employee + employer)
r: expected annual return (decimal)
n: years to retirement
Tax savings per year = Employee contribution x (federal + state + FICA if payroll)
2026 limits: $4,400 self / $8,750 family + $1,000 catch-up at 55+
HSAs offer a triple tax advantage: pre-tax contributions (federal, state in most states, and FICA if payroll-deducted), tax-free growth, tax-free withdrawals for qualified medical expenses at any age. After age 65, non-medical withdrawals are taxed as ordinary income (like a Traditional IRA), no 10% penalty.
💡 Worked example: 35-Year-Old Family Coverage Maxing HSA
Given:
Age 35, retire at 65 (30 years)
Coverage: family
Current balance: $10,000
Annual employee contribution: $8,750 (max for family 2026)
Employer contribution: $1,000
Expected return: 7%
Federal bracket: 22%
State tax: 5%
FICA savings: yes (payroll-deducted)
Steps:
Total annual contribution: $8,750 + $1,000 = $9,750
n = 30 years, r = 0.07
(1.07)^30 = 7.612
FV of starting balance: $10,000 x 7.612 = $76,123
FV of annual contributions: $9,750 x [(7.612 - 1) / 0.07] = $9,750 x 94.461 = $920,991
Total projected balance at 65: $76,123 + $920,991 = $997,114
Total contributed: $10,000 + ($9,750 x 30) = $302,500
Investment growth: $997,114 - $302,500 = $694,614
Annual tax savings on employee contribution: $8,750 x (0.22 + 0.05 + 0.0765) = $8,750 x 0.3465 = $3,032
Lifetime tax savings: $3,032 x 30 = $90,952
Result: $997k projected balance at age 65 with ~$91k cumulative tax savings. HSA outperforms a Traditional IRA for medical-cost retirees because qualified medical withdrawals stay tax-free forever.
❓ Frequently asked questions
What is the triple tax advantage of an HSA?
Three layers. (1) Contributions are pre-tax: federal income, state in most states, AND FICA if payroll-deducted - no other US account offers FICA savings. (2) Investment growth is tax-free, year over year. (3) Withdrawals for qualified medical expenses are tax-free at any age. No other US account stacks all three. The 'stealth IRA' strategy: pay current medical bills out of pocket, save receipts forever, and let the HSA compound for decades. You can reimburse yourself tax-free for those saved receipts at any future time.
How much can I contribute to my HSA?
2026 IRS limits: $4,400 for self-only HDHP coverage and $8,750 for family coverage. Add a $1,000 catch-up at age 55+. Employer contributions count toward the limit. If you have an HDHP for only part of the year, the limit is prorated unless you stay on an HDHP through the following December 31 (last-month rule). The HDHP minimum deductible for 2026 is $1,650 self / $3,300 family, and out-of-pocket max is $8,300 self / $16,600 family.
Can I invest my HSA?
Yes - most HSA custodians (Fidelity, HealthEquity, Lively, Optum, etc.) let you invest the balance above a minimum cash threshold (often $1,000-$2,000) into mutual funds, ETFs, and sometimes individual stocks. The 'stealth IRA' strategy hinges on this: pay current medical bills out of pocket, save the receipts, and let the HSA compound for decades. Fidelity HSA has no minimum to invest and offers commission-free trading - widely considered the best HSA for long-term investors.
What happens to my HSA after age 65?
At 65, your HSA effectively becomes a Traditional IRA for non-medical withdrawals. You can withdraw for any purpose without the 10% penalty (you do pay ordinary income tax on non-medical withdrawals). Medical withdrawals stay tax-free forever. No required minimum distributions (RMDs) - unlike Traditional IRAs and 401(k)s. You can also use HSA funds tax-free for Medicare premiums (Parts B, D, Medicare Advantage), but not Medigap supplement premiums.
What if I leave my job - what happens to my HSA?
Your HSA goes with you. Unlike an FSA (which is forfeited at job loss in most cases), an HSA is owned by you, not your employer. You can keep it at the current custodian (often with monthly fees if your employer was subsidizing) or transfer it tax-free to a different HSA custodian like Fidelity. You can continue contributing only while on an HDHP - if your new employer's plan does not qualify, you stop contributing but the existing balance keeps growing and can be used for medical expenses.