Health Insurance and HSAs

Start with the insurance. Then ask where the tax benefit happened.

Imagine Maya is choosing benefits during open enrollment. She sees a health plan, payroll deductions, an HSA option, and several numbers that all seem related to health care.

The easiest way to organize the tax questions is to ask two things:

Who paid it?
Where did the tax benefit happen?

1. Health insurance comes first

Before we talk about an HSA, start with the health insurance itself.

If Maya’s employer pays for qualifying health coverage, the employer-paid amount can generally be excluded from Maya’s taxable wages. Maya received something valuable, but qualifying employer health coverage is one of the places Congress allows an exclusion.

If Maya pays part of the premium herself through an eligible pretax payroll arrangement, we will describe the employee-funded amount economically as a deduction/subtraction that payroll already handled before the W-2 reaches the return.

So one health plan can involve both ideas:

• Employer-funded qualifying coverage → exclusion
• Employee-funded pretax premium → payroll subtraction already built into taxable wages

That is why we keep asking where the tax benefit happened. Maya generally should not subtract the same employee premium again on Form 1040 if payroll already did the math.

2. What kind of plan makes an HSA available?

An HSA is not simply a bank account anyone may open for a tax deduction.

Before you put money into an HSA, first make sure you are allowed to contribute. The tax term is an eligible individual.

A central requirement is qualifying health-plan coverage. Traditionally, that means an HSA-eligible high-deductible health plan (HDHP) and no disqualifying coverage, subject to additional rules.

For 2025, the traditional HDHP thresholds include:

• minimum deductible, self-only coverage: $1,650;
• minimum deductible, family coverage: $3,300;
• maximum out-of-pocket amount, self-only coverage: $8,300; and
• maximum out-of-pocket amount, family coverage: $16,600.

Marketplace coverage does not automatically prevent HSA eligibility. A Marketplace plan can be HSA-eligible if it satisfies the applicable rules. A separate Premium Tax Credit may also matter for Marketplace coverage, but we will handle that credit later.

One trap: do not assume every health-related payment or every high-deductible plan is automatically HSA-qualified. When the actual plan matters, check the current rules.

3. Why HSAs get so much attention

HSAs can receive favorable tax treatment at several stages.

In simplified form:

Money goes in            → exclusion or deduction may be available
Money grows in account   → generally no current income tax
Qualified medical use    → qualifying distributions can be tax-free

For 2025, the basic contribution limits are $4,300 for self-only coverage and $8,550 for family coverage, with an additional $1,000 catch-up amount generally available beginning at age 55. Eligibility and month-by-month rules can affect the actual permitted contribution.

4. Employer contribution, payroll contribution, or direct contribution?

Now return to Maya’s open-enrollment decision.

If the employer puts money into Maya’s HSA, the contribution can generally be excluded from Maya’s income when the rules are satisfied.

If Maya gives up salary through an eligible payroll arrangement, the tax benefit generally happens before her federal taxable wages reach the return. Under formal HSA reporting rules, that salary-reduction amount is treated as an employer contribution.

If Maya instead transfers money directly from her bank account to the HSA, payroll did not do the subtraction. If the contribution qualifies, Maya generally claims an HSA deduction for AGI on her return.

Employer money → exclusion.
Maya’s qualifying direct contribution → deduction for AGI.
Maya’s qualifying payroll contribution → Maya funded it, but payroll already handled the tax benefit.

5. Payroll contributions can save payroll tax too

Suppose Maya contributes $3,000 to an HSA. Assume a 22% federal marginal income-tax rate and a 7.65% employee Social Security/Medicare rate. Assume she is below the Social Security wage base and ignore state taxes.

Through payroll, the simplified savings are:

Income-tax savings:       $3,000 × 22%    = $660.00
Payroll-tax savings:      $3,000 × 7.65%  =  229.50
                                           --------
Total simplified savings                   $889.50

A qualifying direct HSA contribution can still create the $660 income-tax savings, but generally not the $229.50 employee payroll-tax savings in this simplified example.

Actual results can differ because of the Social Security wage base, Additional Medicare Tax, state rules, and the details of the payroll arrangement. The larger lesson is that different taxes can use different tax bases.

6. What happens when money comes out?

If HSA money is used for qualified medical expenses, the distribution can generally be tax-free.

If Maya uses HSA money for a nonmedical purpose, the distribution is generally taxable and an additional tax can apply before age 65, subject to exceptions.

After age 65, the additional tax generally no longer applies. A nonmedical withdrawal is still generally taxable, which means the HSA can begin to resemble a Traditional IRA for those nonmedical distributions: taxable when withdrawn, but without the additional HSA penalty merely because the use was nonmedical.

Age 65 is also roughly when Medicare becomes important. Once Maya is enrolled in Medicare, she generally can no longer make new HSA contributions. The HSA itself does not disappear; existing money can remain invested and can still be used.

7. HSA versus FSA

The names sound similar, but the accounts work differently.

At a high level, an HSA belongs to the individual, can carry money forward, and can potentially remain invested for years. A health FSA is an employer arrangement with different contribution, carryover, and eligibility rules.

Do not assume a rule for one account automatically applies to the other.

8. HSA versus retirement accounts

HSAs and retirement accounts both reward saving, but the tax timing differs.

A Traditional retirement account generally gives a benefit now and taxes qualifying withdrawals later. A Roth generally taxes the income now and can give the benefit later. An HSA can potentially receive favorable treatment going in and coming out when the distribution pays qualified medical expenses.

That unusually favorable combination helps explain why HSAs are important financial-planning tools for taxpayers who are eligible and whose health plan makes sense for them.

9. Planning starts with the health plan, not the tax deduction

Do not choose a health plan merely because an HSA sounds tax-favored.

First compare the actual insurance choices:

• premiums;
• deductibles;
• out-of-pocket maximums;
• provider networks;
• expected medical use;
• employer contributions; and
• the taxpayer’s ability to absorb a large medical bill.

Then ask whether the HSA tax treatment improves the overall choice.

10. Now try it

Maya has HSA-eligible coverage. During the year:

• her employer contributes $1,000 to her HSA;
• she contributes $2,000 through an eligible payroll salary reduction; and
• she transfers another $500 directly from her checking account to the HSA.

Assume all contributions are within the applicable limit. Which amount should Maya generally claim as a new HSA deduction on her individual return?