HSA Rules for Married Couples: Limits, Medicare, and Form 8889

For married couples, the HSA rules in 2026 come down to one shared ceiling and two separate accounts: if either spouse has family High Deductible Health Plan coverage, you share a combined family contribution limit of $8,750, but any catch-up contributions and the accounts themselves stay individual. The rules for married couples with HSAs reward careful coordination, because one spouse’s health coverage, Medicare enrollment, or FSA election can quietly disqualify the other, and the penalties for missing those details compound year after year.

2026 Contribution Limits

The IRS set the following HSA and HDHP numbers for 2026:¹

Self-only HSA contribution limit: $4,400
Family HSA contribution limit: $8,750
Catch-up contribution for each spouse age 55 or older: $1,000
HDHP minimum deductible: $1,700 self-only, $3,400 family
HDHP maximum out-of-pocket: $8,500 self-only, $17,000 family

Beginning in 2026, bronze and catastrophic plans offered through a health insurance Exchange also qualify as HDHPs even when they don’t meet the standard deductible thresholds. That change came through the One, Big, Beautiful Bill Act and opens HSA eligibility to couples whose Exchange coverage previously didn’t qualify.²

How Couples Share the Family Limit

If either spouse carries family HDHP coverage, both spouses are treated as having family coverage for contribution purposes. You can’t stack a self-only limit on top of a family limit. The $8,750 cap is a combined household total, and it includes any employer contributions deposited into either account.³

How you divide the $8,750 between two HSAs is your call. The default IRS rule is an equal split, but you can agree to any allocation, including putting the entire amount into one spouse’s account and nothing into the other’s.⁴ If each spouse has family coverage under a different HDHP, the couple is treated as covered by the plan with the lowest annual deductible, and the same $8,750 ceiling applies.⁵

Mixed coverage trips people up. If one spouse has self-only HDHP coverage and the other has family coverage, the IRS tells you to disregard the self-only plan entirely and apply only the family contribution limit to the couple’s combined contributions.⁴

Catch-Up Contributions After 55

The catch-up contribution is the one piece that doesn’t get shared. Each spouse who is at least 55 and not yet enrolled in Medicare can add $1,000 on top of the family limit.³ When both spouses qualify, the household’s potential 2026 contribution reaches $10,750.

Here’s the practical catch. Each spouse’s catch-up money has to go into that spouse’s own HSA. You can’t pool both $1,000 catch-ups into a single account. If only one spouse currently has an HSA, the other spouse needs to open an account to receive their catch-up. A proposal to allow spousal catch-up deposits into a single HSA was considered during the One, Big, Beautiful Bill Act negotiations and didn’t make it into the final law.

Coverage Traps That Disqualify a Spouse

To contribute to an HSA for any given month, you must be enrolled in an HDHP on the first day of that month, not enrolled in Medicare, not claimed as a dependent on anyone else’s return, and not covered by another health plan that isn’t an HDHP.⁶

For couples, that last requirement is where one spouse’s benefits can wreck the other’s HSA eligibility. If your spouse has a traditional health care Flexible Spending Arrangement through their employer, that FSA can pay medical costs below your HDHP deductible. The IRS treats that as disqualifying first-dollar coverage, and it knocks both spouses out of HSA eligibility even if you’re personally enrolled in a qualifying HDHP.⁶

There’s a workaround. A Limited Purpose FSA only reimburses dental and vision costs, so it doesn’t cover expenses below your HDHP deductible and doesn’t count as disqualifying coverage. If your spouse’s employer offers one, switching from a general FSA preserves HSA eligibility for both of you. A Dependent Care FSA, which covers childcare rather than medical expenses, also doesn’t disqualify either spouse.

When One Spouse Enrolls in Medicare

Medicare is the eligibility trap that catches the most couples approaching 65. Once you enroll in any part of Medicare, including Part A alone, you can no longer contribute to an HSA. The One, Big, Beautiful Bill Act did not change this.⁶

The other spouse’s eligibility survives. If you enroll in Medicare but your spouse stays on a family HDHP, your spouse can keep contributing to their own HSA up to the full $8,750 family limit, plus their own $1,000 catch-up if they qualify. The contribution limit tracks the HDHP coverage in force, not how many people in the household remain HSA-eligible.

Watch the six-month retroactive enrollment rule. When you sign up for Medicare Part A after turning 65, coverage is backdated up to six months (but not before your 65th birthday). Any HSA contributions made during those retroactive months become excess contributions. If you’re planning to delay Medicare while contributing to an HSA, stop contributions at least six months before your Medicare enrollment date. Signing up for Social Security benefits also triggers automatic Medicare Part A enrollment, which blindsides people who didn’t realize the two were linked.

Mid-Year Changes and the Last-Month Rule

Couples who marry during the year, move from self-only to family coverage, or otherwise change HDHP status mid-year normally face prorated limits based on the months each spouse was eligible on the first day of the month.³

The last-month rule offers a shortcut: if you’re eligible with HDHP coverage on December 1, you can contribute the full annual limit as though you’d been eligible all year. The price is a testing period. You have to stay enrolled in a qualifying HDHP through December 31 of the following year. Fail the test and the amount you contributed above the prorated limit becomes taxable income, plus a 10% additional tax.⁴ Use it only if both spouses will keep qualifying coverage through the full testing period.

Paying for a Spouse’s Medical Expenses

The rules for spending HSA money are completely separate from the rules for contributing. You can withdraw funds tax-free from your HSA to pay for your spouse’s qualified medical expenses even if your spouse has no HDHP coverage, is enrolled in Medicare, or has no health insurance at all.⁵

Qualified medical expenses cover diagnosis, treatment, or prevention of disease, including deductibles, copays, prescriptions, dental, and vision.⁷ Health insurance premiums generally don’t qualify, but a few do: Medicare premiums (Parts A, B, C, and D), COBRA continuation coverage, and health coverage while receiving unemployment benefits can all be paid from an HSA tax-free.³

You can also use your HSA for the qualified medical expenses of any dependent you claim on your tax return. Adult children who are no longer tax dependents don’t qualify even if they remain on your health insurance through age 26. The insurance rule and the HSA spending rule use different definitions of dependent.

Filing Form 8889 as a Couple

Every person who contributes to an HSA or takes a distribution must file Form 8889 with their tax return.⁸ On a joint return, each spouse with an HSA completes a separate Form 8889. You do not combine both accounts onto one form. The deduction amounts from the two forms are then added together and reported on Schedule 1.⁴

Each form shows that spouse’s contributions, their allocated share of the family limit, and any distributions they received. If a spouse took distributions, the HSA custodian issues Form 1099-SA for the total distributed and the amount carries over to Form 8889.⁸

Couples filing separately follow the same process but should document carefully how they divided the family limit. The IRS applies the combined family cap regardless of filing status, so if both spouses claim more than their agreed share, the excess surfaces.⁴

Excess contributions carry a 6% excise tax each year the excess stays in the account.⁹ To stop the clock, ask your HSA custodian for a “return of excess contribution” before your tax filing deadline, including extensions. The custodian withdraws the excess plus any earnings attributable to it; you’ll owe income tax on those earnings but avoid the recurring 6% penalty.

HSAs After Divorce

Once a divorce is final, your former spouse is no longer a spouse for HSA purposes, and you can’t use your HSA tax-free for their medical expenses. You can still cover qualified medical expenses for any dependent children you claim, regardless of custody arrangements.⁵

Transferring HSA funds to a spouse or former spouse as part of a divorce or separation agreement is not a taxable event. After the transfer the receiving spouse becomes the account holder and the funds keep their HSA status.⁵ The separation agreement should spell out how existing balances are divided, as it would for any other financial account.

Inheritance Between Spouses

If an HSA owner dies and the named beneficiary is the surviving spouse, the account simply becomes the surviving spouse’s HSA. No taxable event, no forced distribution, and the surviving spouse can keep using the funds tax-free for qualified medical expenses or let the balance grow.³

The result is very different for any other beneficiary. A non-spouse beneficiary receives the fair market value of the account as taxable income in the year of death, with an offset only for the decedent’s qualified medical expenses paid by the beneficiary within one year.³ If the estate is the beneficiary, that full value lands on the decedent’s final tax return. Naming your spouse as the HSA beneficiary is one of the simplest estate-planning moves a married couple can make, and worth confirming each time you review your accounts.

1
IRS.gov. Rev. Proc. 2025-19
2
Internal Revenue Service. Treasury, IRS Provide Guidance on New Tax Benefits for Health Savings Account Participants Under the One Big Beautiful Bill
3
Internal Revenue Service. Publication 969 – Health Savings Accounts and Other Tax-Favored Health Plans
4
Internal Revenue Service. Instructions for Form 8889
5
Office of the Law Revision Counsel. 26 U.S. Code 223 – Health Savings Accounts
6
Internal Revenue Service. Individuals Who Qualify for an HSA – IRS Courseware
7
Internal Revenue Service. Publication 502 – Medical and Dental Expenses
8
Internal Revenue Service. Instructions for Form 8889
9
Office of the Law Revision Counsel. 26 U.S. Code 4973 – Tax on Excess Contributions to Certain Tax-Favored Accounts and Annuities