Enter Values

$
Current balance in your HSA
$
2026 limits: $4,400 individual / $8,750 family
$
Employer's annual HSA contribution
Determines applicable IRS contribution limit
%
Your federal marginal tax bracket
%
Enter 0 if no state income tax or state doesn't recognize HSA
%
Expected annual return on invested HSA funds
years
How many years to project growth
$
Annual withdrawals for medical expenses
Payroll deductions also avoid 7.65% FICA tax
HSA Formula Reference
FV = PV(1+r)n + C×[(1+r)n-1]/r
PV = Current balance | C = Net annual contribution | r = Annual return | n = Years
Ryan O'Connell, CFA
Calculator by Ryan O'Connell, CFA

HSA Projection Results

Annual Tax Savings
Total Contributions --
Federal Savings --
FICA Savings --
State Savings --
Total Tax Savings Over Period --
Balance Comparison
Projected HSA Balance --
Taxable Equivalent --
HSA Tax Advantage -- --
Your Triple Tax Advantage
Tax-Free Contributions: -- Tax-Free Growth: -- Tax-Free Medical Withdrawals

Projected Growth

Annual Tax Savings Breakdown

Model Assumptions
  • All HSA funds are assumed to be invested (not held as cash)
  • Contributions are made at end of each year (ordinary annuity)
  • Medical expenses are withdrawn at end of each year
  • Constant annual return rate (no volatility modeled)
  • Constant contribution amounts and tax rates over the projection period
  • FICA savings rate is 7.65% (6.2% Social Security + 1.45% Medicare, employee share only)
  • Taxable account comparison uses marginal tax rate as proxy for investment tax drag (simplification)
  • No state-specific HSA rules modeled (e.g., CA and NJ tax HSA contributions)
  • Does not model catch-up contributions ($1,000 additional for age 55+)
  • 2026 IRS contribution limits referenced for warnings only

For educational purposes only. Not financial, tax, or legal advice. Consult a tax professional for personalized HSA guidance.

Understanding Health Savings Accounts

What is an HSA?

A Health Savings Account (HSA) is a tax-advantaged savings account available to individuals enrolled in a High Deductible Health Plan (HDHP). HSAs allow you to save and invest money for current and future medical expenses while receiving significant tax benefits. Unlike FSAs, HSA funds roll over indefinitely and the account is fully portable.

The Triple Tax Advantage

HSAs are sometimes called the "holy grail" of tax-advantaged accounts because they offer three distinct tax benefits:

1. Tax-Deductible Contributions

Your contributions reduce your taxable income, saving you money at your marginal tax rate. If contributed via payroll, you also avoid FICA taxes (7.65%).

2. Tax-Free Growth

Investments inside your HSA grow without capital gains tax, dividend tax, or interest income tax. This allows your money to compound faster than in a taxable account.

3. Tax-Free Withdrawals

Money withdrawn for qualified medical expenses is completely tax-free. No other account type offers all three tax benefits simultaneously.

2026 HSA Contribution Limits

IRS Annual Limits
Individual: $4,400
Family: $8,750
Catch-up (age 55+): Additional $1,000
Includes both employee and employer contributions

HSA vs Taxable Investing

The key advantage of investing through an HSA versus a taxable brokerage account is the elimination of tax drag on investment returns. In a taxable account, capital gains, dividends, and interest are taxed each year, reducing your effective return. In an HSA, your full pre-tax return compounds year after year.

Future Value Comparison
HSA: FV = PV(1+r)n + C×[(1+r)n-1]/r
Taxable: FV = PV(1+rat)n + C×[(1+rat)n-1]/rat
where rat = r × (1 - tax rate on investment gains)
Strategy Tip: If you can pay medical expenses out-of-pocket and let your HSA grow, you maximize the tax-free compounding benefit. Save receipts for medical expenses paid with after-tax money; you can reimburse yourself from the HSA at any future date with no time limit.
Note: California and New Jersey do not recognize HSA tax deductions at the state level. If you live in these states, enter 0 for your state tax rate for HSA-specific calculations.

Frequently Asked Questions

An HSA offers three distinct tax benefits: (1) Tax-deductible contributions that reduce your taxable income for the year, saving you money at your marginal tax rate. (2) Tax-free growth where investments inside the HSA grow without being subject to capital gains or dividend taxes. (3) Tax-free withdrawals where money withdrawn for qualified medical expenses is never taxed. This combination makes HSAs one of the most tax-efficient savings vehicles available.

For 2026, the IRS allows annual HSA contributions of $4,400 for individual (self-only) coverage and $8,750 for family coverage. Individuals age 55 and older can contribute an additional $1,000 catch-up contribution. These limits include both employee and employer contributions combined. Exceeding these limits triggers a 6% excise tax on the excess amount for each year it remains in the account.

If you can cover current medical expenses from other funds, investing your HSA for long-term growth can significantly increase its value due to tax-free compounding. For example, at a 7% annual return over 20 years, invested HSA funds can grow substantially more than cash holdings earning near-zero interest. A common strategy is maintaining 1-2 years of expected medical expenses in cash and investing the remainder in diversified index funds.

The IRS defines qualified medical expenses broadly under Section 213(d). Common examples include doctor visits, prescription medications, dental and vision care, mental health services, lab tests, and medical equipment. Since the CARES Act of 2020, over-the-counter medications and menstrual care products also qualify. Non-qualified withdrawals before age 65 incur income tax plus a 20% penalty; after age 65, non-qualified withdrawals are taxed as ordinary income with no penalty.

Unlike Flexible Spending Accounts (FSAs), HSA funds roll over indefinitely with no "use it or lose it" provision. Your HSA balance carries forward year after year, and the account is fully portable — you keep it even if you change jobs, switch insurance plans, or retire. At age 65, you can use HSA funds for any purpose without penalty, though non-medical withdrawals are taxed as ordinary income, similar to a traditional IRA distribution.

When you contribute to your HSA through payroll deduction, the contribution is made on a pre-tax basis, meaning it avoids both income tax and FICA taxes (Social Security at 6.2% and Medicare at 1.45%, totaling 7.65%). If you contribute directly outside payroll, you can still deduct the contribution from your federal income tax return, but you cannot recover the FICA taxes already paid on that income. For someone contributing $4,000 annually, payroll deduction saves an additional $306 per year in FICA taxes.

To be eligible for an HSA, you must: (1) be enrolled in a High Deductible Health Plan (HDHP), (2) not be covered by another non-HDHP health plan, (3) not be enrolled in Medicare, and (4) not be claimed as a dependent on someone else's tax return. For 2026, an HDHP must have a minimum deductible of $1,650 for self-only or $3,300 for family coverage, with maximum out-of-pocket limits of $8,300 for self-only or $16,600 for family coverage.
Disclaimer

This calculator is for educational purposes only and uses simplified assumptions for tax drag, contribution timing, and return rates. Actual HSA growth depends on your specific investments, tax situation, and medical expenses. Tax laws change frequently; consult a qualified tax professional or financial advisor for personalized HSA guidance. This tool should not be used for tax planning decisions.

Related Calculators

Professional finance illustration representing Marginal & Effective Tax Rate Calculator

Marginal & Effective Tax Rate Calculator

Calculate your 2025 federal marginal and effective tax rate. Supports all 4 filing statuses with...

Try Calculator →
Professional finance illustration representing 50/30/20 Budget Planner Calculator

50/30/20 Budget Planner Calculator

Plan your monthly budget with the 50/30/20 rule. Enter your income and spending to see...

Try Calculator →
Professional finance illustration representing After-Tax Return Calculator: Tax Drag on Investment Returns

After-Tax Return Calculator: Tax Drag on Investment Returns

Calculate after-tax investment returns across different account types.

Try Calculator →