A Health Savings Account is a type of savings account that allows you to set aside money pretax to pay for qualified medical expenses. Contributions that you make to a Health Savings Account (HSA) are used to pay current or future medical expenses (including after you've retired) of the account owner, their spouse, and any qualified dependent.

Medical expenses that are reimbursable by insurance or other sources and do not qualify for the medical expense deduction on a federal income tax return are not eligible.

You cannot be covered by other health insurance with the exception of insurance for accidents, disability, dental care, vision care, or long-term care, and you cannot be claimed as a dependent on someone else's tax return.

Spouses cannot open joint HSAs. Each spouse who is an eligible individual who wants an HSA must open a separate HSA.

Insurance premiums for taxpayers younger than age 65 are generally not considered qualified medical expenses unless the premiums are for health care continuation coverage (such as coverage under COBRA), health care coverage while receiving unemployment compensation under federal or state law.

Health Savings Accounts (HSAs) offer a triple tax advantage:
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Contributions are made pretax.
Growth is tax-free.
Distributions are tax-free as long as they are used for qualified health care expenses.

Contributions to an HSA, which can be opened through your bank or another financial institution, must be made in cash. Contributions of stock or property are not allowed. An employee may be able to elect to have money deposited directly into an HSA account through payroll withholdings. If your employer does not offer this option, you must wait until filing a tax return to claim the HSA contributions as a deduction. Unlike contributions to FSAs, you may change the amount withheld at any time during the year as well, and unused funds automatically roll over into the next calendar year (there is no "use it or lose it").

Funds in the account may be invested much like any other retirement savings account; however, less than 10 percent of account holders do so, according to the Employee Benefit Research Institute. Whether funds can be invested depends on whether the HSA administrator offers this option. There may also be a minimum balance requirement, which could limit individuals with smaller account balances.

However, a Health Savings Account is not available to everyone and can only be used if you have a High Deductible Health Plan (HDHP). Typically, high-deductible health plans have lower monthly premiums than plans with lower deductibles, but you pay more health care costs yourself before the insurance company starts to pay its share (your deductible).

Calendar year 2021. For the calendar year 2021, a qualifying HDHP must have a deductible of at least $1,400 for self-only coverage or $2,800 for family coverage. The beneficiary's annual out-of-pocket expenses, such as deductibles, copayments, and coinsurance, are limited to $7,000 for self-only coverage and $14,000 for family coverage. This limit doesn't apply to deductibles and expenses for out-of-network services if the plan uses a network of providers. Instead, only use deductibles and out-of-pocket expenses for services within the network to figure whether the limit applies.

Last-month rule. Under the last-month rule, you are considered to be an eligible individual for the entire year if you are an eligible individual on the first day of the last month of your tax year (December 1 for most taxpayers).

You can make contributions to your HSA for 2021 until April 15, 2022. Your employer can make contributions to your HSA between January 1, 2022, and April 15, 2022, that are allocated to 2021. The contribution will be reported on your 2021 Form W-2.

Tax deductible. You can claim a tax deduction for contributions you, or someone other than your employer, make to your HSA even if you don't itemize your deductions on Schedule A (Form 1040).

Pretax dollars. Contributions to your HSA made by your employer (including contributions made through a cafeteria plan) may be excluded from your gross income.

Tax-free interest on earnings. Contributions remain in your account until you use them and are rolled over year after year. Any interest or other earnings on the assets in the account are tax-free. Furthermore, an HSA is "portable" and stays with you if you change employers or leave the workforce.

Tax-free distributions. Distributions may be tax-free if you pay qualified medical expenses.

Additional contributions for older workers. Employees, aged 55 years and older are able to save an additional $1,000 per year.

Tax-free after retirement. Distributions are tax-free at age 65 when used for qualified medical expenses including amounts used to pay Medicare Part B and Part D premiums, and long-term care insurance policy premiums. You cannot, however, use money in an HSA to pay for supplemental insurance (e.g., Medigap) premiums.