Can You Have an FSA With Medicare? Limits and Spouse Rules

Yes, you can have an FSA while on Medicare. Health FSA eligibility depends on active employment and participation in your employer’s cafeteria plan, not on what other health coverage you carry. If you’re still working past 65 and enrolled in Medicare Part A, Part B, or both, you can elect and spend from a Health Flexible Spending Account like any other employee. For the 2026 plan year, the contribution ceiling is $3,400.¹

Why Medicare Doesn’t Block FSA Eligibility

The tax code defines a cafeteria plan as one where “all participants are employees” choosing among benefits funded through salary reductions.² Nothing in that definition excludes people who also have Medicare. If you’re on the payroll and your employer’s plan permits participation, you’re in.

Retirees are the ones who lose access. Your salary reduction agreement ends when you leave the company, and retiree health coverage from a former employer doesn’t preserve FSA eligibility. The account is tied to active work, not to insurance status.

Confirm the enrollment each year. Your employer’s plan documents must show you as an active employee, and your salary reduction election has to go through during the open enrollment window. Review the benefits materials to make sure your FSA election is actually on file.

How This Differs From an HSA

The confusion around this question usually comes from Health Savings Accounts, which follow a different rule entirely. Enrolling in any part of Medicare drops your HSA contribution limit to zero.³ FSAs sit in a different section of the tax code and carry no equivalent restriction.

This matters if you’re approaching 65 with an HSA. Anyone collecting Social Security is automatically enrolled in Medicare Part A at 65.⁴ The IRS applies that enrollment retroactively when Medicare coverage is backdated, and HSA contributions made during the retroactive period become excess contributions subject to a 6% penalty.⁵ Switching to a Health FSA is one of the cleaner ways to keep a pre-tax health spending benefit. Some employers also offer a limited-purpose FSA restricted to dental and vision, which pairs well with Medicare’s gaps in those areas.

What the FSA Can and Cannot Pay For

Here’s the hard limit: FSA funds cannot pay Medicare premiums. Part A, Part B, Part C (Medicare Advantage), and Part D premiums are all off-limits.⁵ Submitting a premium payment for reimbursement can create tax consequences or require repayment.

Almost everything else that qualifies as a medical expense under IRS rules is reimbursable. The categories most relevant to Medicare enrollees:

Medicare deductibles and coinsurance, including the Part A hospital deductible, the Part B annual deductible, and the 20% coinsurance on most outpatient services.
Prescription copays under a Part D plan or Medicare Advantage plan.
Dental and vision care, which Medicare Parts A and B barely cover.
Hearing aids, which Medicare generally doesn’t cover and which can run into thousands of dollars.
Over-the-counter medications and menstrual care products, reimbursable without a prescription since the CARES Act.⁶

Reimbursement requires third-party documentation showing the expense was incurred and the amount owed. In practice, that means an itemized receipt or an Explanation of Benefits from Medicare. The expense also cannot have been paid by another health plan.⁵ Keep receipts even when an FSA debit card handles the transaction automatically.

2026 Limits and the Use-It-or-Lose-It Rule

The 2026 pre-tax contribution ceiling is $3,400, up from $3,300 in 2025.¹ Contributions are exempt from federal income tax, Social Security tax, and Medicare tax, so the effective savings run roughly 25% to 35% depending on your bracket.

Money left in the account at plan year-end is generally forfeited. The IRS permits two exceptions, but your employer must choose to build one in, and a plan cannot offer both:⁵

A carryover of up to $680 in unused funds into the next plan year, with anything above that forfeited.
A grace period of two and a half months after the plan year to spend remaining funds on eligible expenses.

This rule matters more once Medicare enters the picture. If Medicare starts paying for services you used to cover out of pocket, your FSA spending drops and an aggressive contribution can leave hundreds of dollars stranded. A conservative election is almost always the safer call.

Gaining Medicare eligibility generally counts as a qualifying life event that lets you adjust your FSA election mid-year, though employers have discretion in which events they recognize. Check your plan document, and if adjustments are allowed, act quickly. Most plans set a 30-to-60-day deadline from the qualifying event.

Using a Working Spouse’s FSA for Medicare Expenses

When one spouse is still working and the other has retired onto Medicare, the working spouse’s FSA can reimburse the retired spouse’s qualified medical expenses.⁵ The premium restriction still applies, so Part B, Part D, and Medicare Advantage premiums remain off-limits. Deductibles, copays, dental work, glasses, hearing aids, and prescriptions all qualify.

Coordinate carefully. The Medicare-enrolled spouse should submit claims to Medicare first and wait for the Explanation of Benefits before requesting FSA reimbursement, because the FSA only covers what’s owed after insurance pays. Submitting expenses Medicare already paid in full can trigger audits and put the employer’s whole cafeteria plan at risk.

What Happens to the FSA at Retirement

The FSA terminates when you leave your employer. Expenses incurred before your last day remain reimbursable during a run-out period, typically 60 to 90 days, but anything after your separation date is not, regardless of the account balance. Unspent funds are forfeited once the run-out period closes.

If your retirement date is known, spend the balance down. Book the dental work, order new glasses, and pick up eligible supplies before your coverage ends. COBRA continuation technically extends to Health FSAs because the IRS treats them as group health plans,⁷ but you’d pay 102% of the plan cost for coverage that usually only runs through the current plan year. Unless you’ve already spent more than you’ve contributed, the math rarely works.

1
FSAFEDS. New 2026 Maximum Limit Updates
2
Office of the Law Revision Counsel. 26 U.S. Code 125 – Cafeteria Plans
3
Office of the Law Revision Counsel. 26 U.S. Code 223 – Health Savings Accounts
4
Social Security Administration. When to Sign Up for Medicare
5
Internal Revenue Service. Publication 969 (2025), Health Savings Accounts and Other Tax-Favored Health Plans
6
Internal Revenue Service. IRS Outlines Changes to Health Care Spending Available Under CARES Act
7
U.S. Department of Labor. Continuation of Health Coverage (COBRA)