2026 HSA Contribution Deadlines and Limits: What You Need to Know

An HSA is a tax-advantaged savings account that lets you set aside pretax funds for qualified medical expenses. One of the most important things to understand about HSAs is their "triple tax advantage":

• Tax benefit number one: HSAs can be funded with pretax dollars, meaning you can deposit money you've earned but haven't paid taxes on yet.
• Tax benefit number two: The money in your HSA grows and accumulates interest (or investment returns) tax-free.
• Tax benefit number three: You can withdraw money from your HSA tax-free, as long as it's used for qualified medical expenses.

To contribute to an HSA, you must be enrolled in a qualifying high-deductible health plan (HDHP), have no other disqualifying coverage, not be enrolled in Medicare, and not be claimed as a dependent on someone else's tax return. For the full list of eligibility requirements, see Important HSA Rules You Have to Know.

For the 2026 tax year, the IRS has increased the annual contribution limits:

• Self-only coverage: $4,400
• Family coverage: $8,750
• Catch-up contribution (age 55+): An additional $1,000

To qualify as an HSA-eligible HDHP in 2026, your plan also needs to meet these thresholds, per IRS Revenue Procedure 2025-19:

• Minimum annual deductible: $1,700 self-only / $3,400 family
• Maximum annual out-of-pocket limit: $8,500 self-only / $17,000 family

The IRS releases HSA figures earlier than most other tax numbers, since employers need them for fall open enrollment. Under Revenue Procedure 2026-24, the 2027 limits are already set:

• Self-only coverage: $4,500 (up from $4,400 in 2026)
• Family coverage: $9,000 (up from $8,750 in 2026)
• Catch-up contribution (age 55+): Still an additional $1,000 — this amount is fixed by statute and hasn't changed since 2009

The 2027 HDHP qualification thresholds are also increasing slightly:

• Minimum annual deductible: $1,750 self-only / $3,500 family
• Maximum annual out-of-pocket limit: $8,700 self-only / $17,400 family

These 2027 numbers only apply to contributions made during the 2027 calendar year. Your 2026 contributions are still governed by the limits above.

• Last day to contribute for the 2025 tax year: April 15, 2026
• Last day to contribute for the 2026 tax year: April 15, 2027

You can keep contributing toward a given tax year all the way through Tax Day of the following year. That's the federal income tax filing deadline, not December 31. So if you haven't maxed out your 2025 contribution yet, you can still do it in early 2026, right up to the April 15 deadline (or the extended deadline if you file for an extension).

If you only become HSA-eligible partway through the year, your contribution limit is normally prorated based on the number of months you had qualifying coverage. But there's an exception: the last-month rule.

If you're HSA-eligible on December 1 of a given year, the last-month rule lets you contribute the full annual limit for that year, even if you were only eligible for part of it.

The catch is in order to keep that full contribution, you have to remain HSA-eligible through December 31 of the following year. This is called the 13-month testing period. If you lose HSA eligibility before that window closes (other than due to death or disability), the extra amount you contributed under the last-month rule becomes taxable income, plus a 10% additional tax.

Contributing more than your annual limit triggers a 6% excise tax on the excess amount for every year it stays in the account. The fix is straightforward if you catch it in time: withdraw the excess contribution, along with any earnings it generated, before your tax filing deadline (including extensions). Do that, and you can avoid the excise tax, though you'll still owe regular income tax on the earnings you withdraw.

If you have more than one HSA, keep in mind the limit applies across all of your accounts combined, not per account.

For the full walkthrough, including how to withdraw or carry forward an excess contribution, and how to tell if you've actually gone over, see HSA Excess Contribution: What to Do If You Over-Contribute.

Employer contributions count toward your annual limit dollar-for-dollar. For example, if you have self-only coverage in 2026 (a $4,400 limit) and your employer contributes $1,200 on your behalf, you can personally contribute up to $3,200 more before hitting the cap.

For a deeper walkthrough of how this interacts with payroll contributions and mid-year plan changes, see Do Employer Contributions Affect Your HSA Limit?

If you're 55 or older and not enrolled in Medicare, you can add an extra $1,000 catch-up contribution on top of the standard limit. One detail that trips people up: you can't combine catch-up contributions into one account. If both spouses are 55+ and want to make catch-up contributions, each spouse needs their own HSA meaning the extra $1,000 can't be deposited into a single shared account.

Contributing the full amount to your HSA every year is a smart long-term financial move. Unused HSA funds roll over every year with no expiration date and no cap on how much can accumulate, which means your HSA can function much like an additional retirement account. Once you hit your plan's minimum investment threshold, you can typically invest a portion of your balance, letting it grow tax-free alongside your other retirement accounts. And after age 65, you can withdraw HSA funds for non-medical expenses without the usual 20% penalty. You'll just owe regular income tax, similar to a traditional IRA.

Curious how much to actually contribute given your own budget and expected expenses? See How Much Should I Contribute to My HSA?

An item is HSA or FSA eligible if it is considered a qualified medical expense under section 213(d) of the IRS Code. According to the IRS, the item must be for a medical purpose, or "to alleviate or prevent a physical or mental disability or illness.” IRS Publication 502 features a (non-exhaustive) list of eligible expenses.

Thousands of products and services that are not featured on that list may also be HSA eligible for qualified customers when the product or service is used to treat, prevent, cure or mitigate a diagnosed chronic condition. For some qualified customers, that may mean a gym membership to treat obesity while for others it could be a supplement to treat a diagnosed nutritional deficiency. The key is the product or service must be clearly connected to the treatment of a medical condition, and in many cases, accompanied by appropriate documentation like a Letter of Medical Necessity (LMN) from a licensed clinician.

With Truemed, qualified customers can explore thousands of potentially eligible products like mattresses, bikes, red light masks, and more and go through the eligibility check right at checkout with Truemed’s partner brands.