Free 401k + HSA + Roth calculator

How much tax alpha are you leaving on the table?

Most people miss $1,000–$5,000/year in employer match and HSA tax savings — without knowing it. Enter 6 numbers to find yours.

60 seconds·No login required·Uses actual IRS 2026 limits

Calculate your tax alpha

Takes about 60 seconds. Uses 2026 IRS limits.

Your income

W-2 or self-employment income before any deductions

$

For federal income tax brackets

401(k) — 2026 IRS limit: $24,500/yr

%

e.g., 50 = “50% match”

%

e.g., 6 = “up to 6%”

%

HSA — 2026 IRS limits: $4,400 (self) / $8,750 (family)

I have an HSA-eligible High Deductible Health Plan (HDHP)

Educational estimate only — not financial or tax advice. See footer for sources.

Three gaps we check for you

Employer match gap

Your employer's matching contribution is a guaranteed 50–100% return on every dollar — up to a cap. We show you exactly how much free money you're leaving on the table.

HSA triple tax advantage

HSA contributions are pre-tax in, grow tax-free, and come out tax-free for medical expenses. At a 22% marginal rate, every $1,000 under-contributed costs you $220 in unnecessary taxes.

Roth vs. Traditional

Whether to pay taxes now (Roth) or later (Traditional) depends on your current bracket vs. your expected retirement income. We give you a directional recommendation in seconds.

The math uses real IRS 2026 limits

We look up the actual IRS contribution limits every year — not outdated guesses. The 2026 limits were set in IRS Notice 2025-67 (401k/IRA) and IRS Rev. Proc. 2025-19 (HSA). Tax brackets are from IRS Rev. Proc. 2025-32 (incorporates the One Big Beautiful Bill Act).