Quick Answer

A Health Savings Account can provide several federal tax advantages: eligible contributions may receive favorable tax treatment, earnings generally are not included in federal income while held in the account, and distributions used for qualified medical expenses can be tax-free. Those benefits, however, depend on following the HSA rules.

Here are several mistakes that can reduce the value of an HSA.

Mistake 1: Exceeding the Contribution Limit

HSA contribution limits change periodically.

For calendar year 2026, the federal contribution limit is $4,400 for qualifying self-only HDHP coverage and $8,750 for qualifying family HDHP coverage. Eligible individuals who are age 55 or older at year-end may generally make an additional $1,000 catch-up contribution.

Employer contributions count toward the annual limit, so employees should not look only at the amount they personally deposited.

Excess HSA contributions can generally be subject to a 6% excise tax for each year the excess remains in the account unless corrected under the applicable rules.

Mistake 2: Treating an HSA Like an FSA

An HSA is not generally a “use it or lose it” account.

Amounts remaining in an HSA at year-end generally carry forward into future years, and earnings on amounts held in the account generally are not included in income while they remain in the HSA.

That means an HSA does not necessarily need to be emptied simply because December 31 is approaching.

Mistake 3: Ignoring the Investment Option

Depending on the HSA custodian, account holders may have access to investment choices once certain account requirements are met.

For people who can pay current healthcare expenses from cash flow, investing a portion of an HSA may support longer-term planning for future healthcare costs.

That does not mean every HSA dollar should be invested. Money expected to be used for near-term medical expenses should be considered in light of liquidity needs and investment risk.

The larger point is to make an intentional decision rather than leaving the account allocation on autopilot.

Mistake 4: Using HSA Money for Nonqualified Expenses

HSA distributions used for qualified medical expenses generally can be received tax-free.

A distribution not used for qualified medical expenses is generally included in taxable income. Before age 65, the taxable amount may also be subject to an additional 20% tax. The additional 20% tax generally no longer applies after age 65, disability, or death, although a nonqualified distribution may still be taxable income.

Qualified-expense rules also contain details that are easy to miss. For example, HSA funds generally cannot be used tax-free for most health-insurance premiums, although exceptions exist for items such as certain COBRA coverage, qualifying long-term-care insurance, and certain Medicare premiums after age 65. Medigap premiums are treated differently.

Mistake 5: Continuing Contributions After Medicare Enrollment

Medicare and HSA eligibility need to be coordinated.

Beginning with the first month an individual is enrolled in Medicare, that individual’s HSA contribution limit is generally zero. Retroactive Medicare coverage can also result in prior HSA contributions being treated as excess contributions.

Someone working beyond 65 and planning to enroll in Medicare later should therefore review the timing before making final HSA contributions.

Mistake 6: Throwing Away the Receipts

Good records are part of good HSA management.

The IRS says HSA owners should maintain records showing that distributions were used exclusively for qualified medical expenses, that those expenses were not reimbursed from another source, and that the expenses were not also taken as an itemized medical deduction.

Digital receipt storage can make this considerably easier over a long retirement-planning horizon.

The Planning Takeaway

An HSA can function as more than a current-year medical spending account.

For the right household, it can be part of a broader tax, healthcare, and retirement strategy. The value comes from understanding eligibility, monitoring contributions, keeping sufficient liquidity, preserving documentation, and coordinating the account with Medicare and other benefits.

Frequently Asked Questions

What are the 2026 HSA contribution limits?
The limits are $4,400 for self-only HDHP coverage and $8,750 for family HDHP coverage, subject to eligibility and other rules.

What happens if I contribute too much to an HSA?
Excess contributions can generally be subject to a 6% excise tax for each year they remain uncorrected.

Do I lose unused HSA money at year-end?
Generally no. HSA balances generally carry forward from year to year.

What happens to nonqualified HSA withdrawals after age 65?
They generally remain taxable as income, but the additional 20% tax generally does not apply after age 65.

Federal HSA tax treatment is discussed here. State tax treatment can differ, and individual eligibility and expenses should be reviewed with appropriate professionals.

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