HSA Investment Calculator

A health savings account is the only US account that is untaxed at all three stages: the contribution is deductible, investment growth is untaxed, and qualified medical withdrawals are untaxed at any age. That is why the projection here separates two quantities. The balance grows on net money actually left invested - contributions plus employer money minus current medical spending - while the tax benefit is computed on the contribution itself using the combined federal and state marginal rate. Payroll-deducted contributions also escape FICA at 7.65 percent, a benefit no IRA or 401(k) offers, which is why that rate appears as a separate term rather than being folded into the income tax saving. Eligibility is the binding constraint. Only people enrolled in a qualifying high deductible health plan may contribute, and the IRS resets the thresholds annually: for 2024 the contribution ceiling was 4,150 dollars for self-only and 8,300 dollars for family coverage, with an extra 1,000 dollar catch-up from age 55 that is fixed by statute and never indexed. Employer contributions count against the same ceiling. After age 65 the 20 percent penalty on non-medical withdrawals disappears and the account behaves like a traditional IRA, taxed as ordinary income, while medical withdrawals stay tax free. The projection assumes a constant return and a constant marginal rate, and it ignores account custodian fees and the cash minimums many HSA providers require before allowing investment.

The HSA descends from an earlier experiment. The Health Insurance Portability and Accountability Act of 1996 authorised Archer Medical Savings Accounts as a capped pilot for the self-employed and small employers, limited in number of participants and repeatedly extended by Congress. Uptake was modest, but the pilot established the core design of pairing a tax-favoured savings account with a high-deductible insurance policy so that routine costs are paid by the consumer rather than the insurer. The permanent version was created by the Medicare Prescription Drug, Improvement, and Modernization Act of 2003, signed in December of that year, which added section 223 to the Internal Revenue Code and made accounts available from 1 January 2004. The IRS set out the operating rules in Publication 969 and defines qualified expenses by reference to section 213(d). Two later changes broadened the account materially: the Affordable Care Act had removed over-the-counter drugs from the eligible list in 2011, and the CARES Act of March 2020 reversed that and added menstrual products permanently. Over the same period the account drifted from a spending vehicle toward a retirement one, as custodians began offering brokerage windows and mutual fund menus, and advisers started recommending that participants pay current medical bills from cash, retain the receipts, and leave the balance invested for decades.