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HSA Tax Triple Benefit Calculator

Contributions are pre-tax. Growth is tax-free. Withdrawals for medical are tax-free. See the Stealth IRA strategy and your total tax benefit vs investing in a taxable account.

Where this fits

🧾 TaxTax StackCash FlowFreelancersEmployees

This tool lives inside Tax Stack + Cash Flow and is most useful for freelancers and employees.

401(k) Limit 2024$23,000
Roth IRA Limit$7,000
S&P 500 Avg Return~10%/yr

Your HSA Profile

Coverage Type

2024 contribution limits. You must be enrolled in a qualifying High-Deductible Health Plan (HDHP).

Marginal Tax Rate
Immediate Tax Savings

$1,230

$913 income tax + $317 FICA this year

Tax-Free Growth Advantage

$126,789

HSA ($419,453) vs taxable ($292,664) over 30 yrs

Tax-Free Withdrawal

$0 tax

Qualified medical withdrawals are never taxed — unlike 401(k) or IRA distributions

Projected HSA Balance
$419,453
In 30 years
vs Taxable Account
+$126,789
HSA advantage
Total Tax Benefit
$197,058
Lifetime estimate
Effective Benefit Rate
158.3%
Tax saved per $ contributed

HSA vs Taxable Account — 30-Year Comparison

Annual contribution$4,150
HSA projected balance$419,453
Taxable account (after LTCG tax)$292,664
HSA advantage+$126,789

Taxable account assumes after-tax contributions (22% tax drag) and 15% LTCG on gains. HSA growth is entirely tax-free.

The Stealth IRA Strategy

Instead of withdrawing from your HSA to pay $1,500/year in medical expenses, pay out of pocket and save your receipts. Your HSA balance compounds tax-free. There is no expiration on HSA reimbursements — reimburse yourself years later for a tax-free cash infusion in retirement.

Medical paid OOP

$45,000

over 30 yrs

HSA grows to

$151,610

vs spending immediately

Tax saved bonus

$33,354

from deferred withdrawal

Strategy Recommendation

You are on a strong HSA path. If your employer plan allows HSA investing (not just a savings account), move funds above your deductible into low-cost index funds to maximize tax-free growth.

2024 HDHP minimums (individual): $1600 deductible / $8050 out-of-pocket max

2024 HDHP minimums (family): $3200 deductible / $16100 out-of-pocket max

1

Annual contribution (vs. 2024 limit)

min(annualContribution, maxContribution)

min($4,150, $4,150) = $4,150

= $4,150

2024 individual limit: $4,150

2

Immediate tax savings (income tax + FICA)

contribution × marginalRate + contribution × 7.65%

$4,150 × 22% + $4,150 × 7.65% = $913 + $317

= $1,230

FICA savings apply when contributed via payroll (most employer plans).

3

After-tax equivalent for taxable account

contribution × (1 − marginalRate)

$4,150 × (1 − 22%) = $3,237

= $3,237

4

HSA future value (tax-free growth)

PMT × ((1 + r)ⁿ − 1) ÷ r × (1 + r)

$4,150 × ((1 + 7.0%)^30 − 1) ÷ 7.0% × (1 + 7.0%)

= $419,453

Over 30 years at 7.0% return. All growth is tax-free.

5

Taxable account future value (after-tax, LTCG drag)

afterTaxPMT × annuity factor − gains × 15%

After-tax contrib: $3,237/yr, 15% LTCG on gains

= $292,664

15% long-term capital gains rate applied to investment gains.

6

Tax-advantaged gain vs taxable account

HSA balance − taxable account balance

$419,453 − $292,664

= $126,789

7

Total lifetime tax benefit estimate

immediateSavings × years + taxAdvantagedGain + stealthIRABonus

$1,230 × 30 + $126,789 + $33,354

= $197,058

Effective tax rate on contributions: 158.3%

Key insight

At a 22% marginal rate, maxing your HSA at $4,150/year saves $1,230 immediately (income tax + FICA). Over 30 years at 7.0% return, your HSA compounds to $419,453 — $126,789 more than the same money in a taxable account. Every dollar withdrawn for qualified medical expenses is completely tax-free.

Use this result in →

401(k) Optimizer →Tax Loss Harvesting →Benefits Valuer →

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