HSA Contribution Limits 2026 and 2027: Catch-Up, Last-Month and Proration Rules

A health savings account (HSA) gives you a tax-advantaged way to pay for medical costs, but only if you follow the yearly rules. The dollar limits change each year, and a few special rules decide how much you can really put in.

This guide covers the amounts for 2026 and 2027, the age 55 catch-up, the married-couple quirk, the last-month rule, and proration. To turn these rules into your own number, use the HSA contribution calculator with your plan details.

HSA Contribution Limits for 2026 and 2027

The short answer: the 2026 limit is $4,400 for self-only coverage and $8,750 for family coverage. For 2027 the IRS set $4,500 self-only and $9,000 family. The family limit is not simply double the self-only limit, so check the right row for your plan.

These caps cover everything added to the account in the year. That includes your own payroll or direct deposits, plus anything your employer puts in. The limit is a ceiling on the total, so an employer deposit lowers how much you can add yourself.

Here is a worked example. Say you have family coverage for all of 2026, you are under 55, and your employer puts in $1,200. Your limit is $8,750, so you subtract the $1,200 employer deposit and have $7,550 of room left to add yourself. The calculator does this subtraction for any employer amount.

The Age 55 Catch-Up and the Married Couple Rule

If you are 55 or older by the end of the year, you can add an extra $1,000 on top of your normal limit. This catch-up amount is set by law and does not change year to year, so it is $1,000 for both 2026 and 2027.

The married-couple rule trips many people up. The $1,000 catch-up is per person, but it must go into that person’s own HSA. So if both spouses are 55 or older, you can put $1,000 extra in each spouse’s account, but you cannot stack both catch-ups in a single HSA.

That means a couple with family coverage who are both 55 or older in 2026 can contribute up to $8,750 plus $1,000 plus $1,000. To capture the full amount, the second $1,000 needs a second HSA opened in the other spouse’s name.

HDHP Rules: Deductible and Out-of-Pocket Limits

You can only contribute to an HSA if you are covered by a qualifying high-deductible health plan (HDHP). The plan has to meet both a minimum deductible and a cap on what you can be asked to pay out of pocket.

For 2026, the minimum deductible is $1,700 for self-only coverage and $3,400 for family coverage. For 2027, those minimums rise to $1,750 and $3,500. The 2026 out-of-pocket maximum is $8,500 self-only and $17,000 family.

If your deductible is below the minimum, the plan is not an HDHP and you cannot open or fund an HSA. If you are unsure whether an HSA fits your situation at all, our guide on HSA vs FSA walks through the trade-offs.

The Last-Month Rule and Its Testing Period

The last-month rule is a helpful shortcut with a catch. If you have HDHP coverage on December 1 of a year, the IRS lets you contribute the full annual limit for that year, even if you were not covered for the earlier months.

The catch is the testing period. To keep that full-year contribution, you must stay HSA-eligible through December 31 of the following year. If you drop out early, the extra amount you contributed becomes taxable income, plus a 10% additional tax applies.

This rule is useful if you start an HDHP partway through the year and want to save more. Just be sure your plans for the next year are stable before you rely on it.

Proration: When You Are Not Eligible All Year

The short answer: if you are not HDHP-covered for the whole year and you do not use the last-month rule, you prorate. Your limit is the months you were eligible divided by 12, times the annual limit.

Eligibility is measured on the first day of each month. So if you became eligible on June 1 and stayed eligible through year end, that is 7 months. Your limit would be 7 divided by 12, times the annual cap for your coverage.

Proration and the catch-up stack. If you also turned 55 that year, you prorate the $1,000 catch-up by the same months-over-12 fraction. Running both pieces by hand is easy to get wrong, so model a partial year carefully before you file your return.

New for 2026: Bronze and Catastrophic Plans Qualify

A recent law change widens who can use an HSA. Starting in 2026, bronze and catastrophic plans bought on the Affordable Care Act Marketplace are treated as HSA-eligible coverage, even if they would not otherwise meet the HDHP definition.

That matters because many Marketplace shoppers pick bronze or catastrophic plans for the lower premium. Before this change, those plans often did not qualify for HSA contributions. Now a Marketplace buyer on one of those tiers can open and fund an HSA.

If an HSA is new to you, pairing it with long-term saving can be powerful, since the money can grow tax-free for qualified costs. See how balances build over time with the compound interest calculator or plan the bigger picture with the retirement calculator.

FAQs About HSA Contribution Limits

Sources and Further Reading

This article is general education, not financial, tax or investment advice. Figures and limits can change; confirm current amounts on the official source before you rely on them. Reviewed for accuracy by Prof. Dr. Khalil Mudassar, PhD. Last updated 2026-10-06. Not affiliated with or endorsed by the IRS, CMS, SSA or BLS.