Turning 65 With an HSA? When to Stop Contributing
You cannot put money into an HSA once any part of Medicare starts, and Part A can be backdated up to 6 months. Here is how to time your last contribution, what the 2026 limits are, and how to spend the balance in retirement.
Key takeaways
- Once you are enrolled in any part of Medicare, including premium-free Part A, you can no longer contribute to a Health Savings Account.
- If you sign up for Medicare after 65, premium-free Part A is backdated up to 6 months (never earlier than the month you turned 65). Stop contributing about 6 months before you apply to avoid a tax problem.
- 2026 limits: $4,400 self-only, $8,750 family, plus a $1,000 catch-up if you are 55 or older (IRS Rev. Proc. 2025-19).
- You can keep spending the HSA tax-free on qualified costs after Medicare starts, including Part B, Part D and Medicare Advantage premiums. Medigap premiums do not qualify.
- New for 2026: bronze and catastrophic Marketplace plans count as HSA-eligible, which opens HSAs to many early retirees buying on HealthCare.gov in Arizona.
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The short answer: stop putting money into your HSA before your Medicare coverage starts, and if you are signing up after 65, stop about 6 months before you apply. Medicare and HSA contributions do not mix, and the backdating rule on Part A catches people who think they stopped in time.
The good news is that the money you have already saved keeps working. An HSA is one of the few accounts that can pay Medicare premiums tax-free, and many East Valley families use it as a dedicated health fund for retirement.
This article covers the 2026 contribution limits, the timing rules around Medicare, what you can spend the balance on, and the 2026 change that makes HSAs available to more Arizonans buying their own coverage before 65.
Can I contribute to an HSA after I enroll in Medicare?
No. From the first month you are enrolled in Medicare, Part A or Part B, your HSA contribution limit is zero. That applies even if you are still working and still on a high-deductible employer plan.
This is why some people who keep working past 65 choose to delay premium-free Part A as well as Part B. If you are already collecting Social Security retirement benefits, though, you are enrolled in Part A automatically at 65 and cannot turn it down without paying back benefits. In that case HSA contributions stop at 65.
Why should I stop contributing 6 months early?
Because premium-free Part A is backdated. When you sign up for Medicare after your 65th birthday, Part A coverage generally starts up to 6 months before the month you apply, but no earlier than the month you turned 65. Any HSA contributions made during those backdated months become excess contributions.
| If you apply for Medicare in | Part A may start as early as | Last month to count for HSA contributions |
|---|---|---|
| July 2027, age 67 | January 2027 | December 2026 |
| April 2027, age 66 and 2 months | October 2026 | September 2026 |
| March 2027, turned 65 in December 2026 | December 2026 | November 2026 |
Excess contributions are not deductible and face a 6% excise tax each year they stay in the account. You can usually fix them by withdrawing the excess and any earnings before your tax filing deadline, but it is far easier to avoid the problem by stopping early.
What are the 2026 HSA contribution limits?
For 2026 the limit is $4,400 for self-only coverage and $8,750 for family coverage. If you are 55 or older you can add a $1,000 catch-up contribution.
| Item | Self-only | Family |
|---|---|---|
| HSA contribution limit | $4,400 | $8,750 |
| Catch-up contribution, age 55 or older | $1,000 | $1,000 per eligible spouse, in each spouse's own HSA |
| Minimum plan deductible | $1,700 | $3,400 |
| Maximum out-of-pocket for the plan | $8,500 | $17,000 |
In the year Medicare starts, the limit is prorated by month. If Medicare begins in July, you can contribute 6/12 of the annual limit, including 6/12 of the catch-up. You have until the tax filing deadline, April 15, 2027 for 2026, to make contributions for the year.
Source: Arithmetic on the IRS 2026 limits ($4,400 plus $1,000 catch-up), for illustration only.
What can I spend HSA money on once I have Medicare?
Plenty. After 65 your HSA can pay qualified medical expenses tax-free, and that list includes several Medicare costs that most accounts cannot touch.
Qualified, tax-free
- Part B premiums ($202.90 a month standard in 2026)
- Part D drug plan premiums
- Medicare Advantage premiums
- Deductibles, copays and coinsurance
- Dental, vision and hearing costs that count as medical care
- Part of a qualified long-term care insurance premium, up to IRS age limits
Not qualified
- Medicare Supplement (Medigap) premiums
- General health items that are not medical care
- Non-medical spending, which is taxed as income (no 20% penalty after 65)
After 65 the 20% additional tax on non-medical withdrawals no longer applies, so the HSA behaves much like a traditional retirement account for non-medical spending: ordinary income tax, no penalty. Keep receipts for medical spending, because you can reimburse yourself later for qualified costs you paid out of pocket after the HSA was opened.
What should I do with my HSA after contributions stop?
Keep it open. The account is yours, it does not expire when you join Medicare, and the balance can keep paying qualified medical costs tax-free for the rest of your life. Stopping contributions only means no new deposits.
- Decide how it will pay Medicare premiums. Part B is usually taken from your Social Security payment, so many people pay it from the benefit and then reimburse themselves from the HSA, keeping a record of each month.
- Keep your receipts in one place. Reimbursements need proof that the expense was a qualified medical cost and that it happened after the HSA was set up.
- Name a beneficiary. A spouse who inherits the HSA can treat it as their own. Other beneficiaries generally owe income tax on the balance in the year of death, so the choice matters.
- Review the investments. Money you expect to spend in the next few years on premiums and copays may belong in cash rather than investments that can fall in value.
If you also have a Medicare Supplement, remember that its premium is not a qualified expense, while Part B and Part D premiums are. Many people simply use the HSA for those, and pay the Medigap premium from other income.
What changed in 2026 for Arizonans who buy their own coverage?
Starting January 1, 2026, bronze and catastrophic plans available through an Exchange are treated as HSA-eligible high-deductible plans, under the One Big Beautiful Bill Act. Arizona uses HealthCare.gov, so that covers bronze and catastrophic plans bought there, and IRS Notice 2026-5 extends it to matching plans sold off the exchange.
Before this change, many bronze plans did not qualify because their out-of-pocket limits were above the HSA rules. For someone in Chandler or Gilbert who retired at 60 and buys a Marketplace bronze plan, it now means years of HSA contributions before Medicare that were not possible before.
The bottom line
An HSA is a strong way to save for health costs in retirement, but contributions must stop before Medicare starts, and the 6-month Part A backdating rule means stopping earlier than you think if you enroll after 65. Keep the balance, spend it on Medicare premiums and medical bills tax-free, and if you are an early retiree on a Marketplace bronze plan, 2026 rules may let you keep contributing until then.
Frequently asked questions
Can I contribute to my HSA if I am on Medicare Part A only?
No. Enrollment in any part of Medicare, including premium-free Part A, sets your HSA contribution limit to zero from that month on.
How far back does Medicare Part A go when I sign up after 65?
Premium-free Part A is generally backdated up to 6 months from the month you apply, but never earlier than the month you turned 65. That is why we suggest stopping HSA contributions about 6 months before you apply.
Can I use my HSA to pay Medicare premiums?
Yes, for Part B, Part D and Medicare Advantage premiums once you are 65 or older. Medicare Supplement (Medigap) premiums are not a qualified expense.
What is the 2026 HSA limit?
$4,400 for self-only coverage and $8,750 for family coverage, plus a $1,000 catch-up contribution if you are 55 or older, per IRS Revenue Procedure 2025-19.
Sources
- IRS Revenue Procedure 2025-19 (2026 HSA and HDHP limits) Internal Revenue Service
- IRS Publication 969, Health Savings Accounts and Other Tax-Favored Health Plans Internal Revenue Service
- IRS Notice 2026-5, HSA provisions of the One Big Beautiful Bill Act Internal Revenue Service
- Medicare & You 2027 handbook Centers for Medicare & Medicaid Services
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