For the 2026 tax year, HSA contribution limits are $4,400 if you have self-only coverage under a High Deductible Health Plan and $8,750 if you have family coverage.1Internal Revenue Service. Rev. Proc. 2025-19 – Health Savings Account Inflation Adjusted Amounts for 2026 Account holders 55 and older can add another $1,000. Those caps cover every dollar going in, from you and your employer combined.
The family limit is a single ceiling regardless of household size. A plan covering two people and a plan covering six both share the same $8,750 cap, as long as the plan meets the family HDHP deductible threshold. For context on the plan itself: a 2026 HDHP must carry a minimum deductible of $1,700 for self-only or $3,400 for family coverage, with in-network out-of-pocket costs capped at $8,500 or $17,000 respectively.1Internal Revenue Service. Rev. Proc. 2025-19 – Health Savings Account Inflation Adjusted Amounts for 2026
Catch-Up Contributions at Age 55
If you turn 55 or older by December 31 of the tax year, you can add $1,000 on top of the standard limit.2Office of the Law Revision Counsel. 26 U.S. Code 223 – Health Savings Accounts That figure is set by statute and doesn’t adjust for inflation, which is why it’s been $1,000 since 2009.
Married couples both 55 or older on a family HDHP can each make a catch-up contribution, but only into their own separate HSAs. You can’t stack both $1,000 catch-ups into a single account. The maximum a qualifying couple can put away in 2026 is $10,750: the $8,750 family limit plus two individual $1,000 catch-ups in two separate accounts.
Employer Contributions Count Against Your Limit
Every dollar your employer deposits into your HSA uses up part of the same annual cap. If your employer puts $1,500 into your self-only HSA for 2026, you have $2,900 of room left before hitting $4,400. Employer contributions are excluded from your taxable income, so the tax benefit is real, but the ceiling doesn’t move.3Internal Revenue Service. HSA Contributions and Deductions
This is where accidental over-contributions tend to happen, especially when you change jobs mid-year and receive deposits from two different employer plans. Before year-end, add up everything that has gone into the account from any source.
Mid-Year Eligibility and the Last-Month Rule
Eligibility is measured month by month. You need qualifying HDHP coverage on the first day of a month for that month to count. If you become eligible partway through the year, divide the annual limit by 12 and multiply by the number of qualifying months. Someone gaining self-only HDHP coverage on August 1 has five eligible months and a prorated limit of roughly $1,833 for 2026.4Internal Revenue Service. Health Savings Accounts and Other Tax-Favored Health Plans
The last-month rule is the exception. If you have qualifying HDHP coverage on December 1, you can be treated as eligible for the whole year and contribute the full annual limit, even with just one month of actual coverage.4Internal Revenue Service. Health Savings Accounts and Other Tax-Favored Health Plans
Using it comes with a testing period. You must stay enrolled in a qualifying HDHP through December 31 of the following year. Drop coverage during that window and the amount you contributed beyond what proration would have allowed gets added back to your taxable income in the year you lost eligibility, plus a 10% additional tax on that amount.6Office of the Law Revision Counsel. 26 U.S. Code 223 – Health Savings Accounts
When Contributions Are Due
Contributions don’t have to land during the calendar year. You have until April 15, 2027 to make a contribution that counts toward your 2026 limit.5Internal Revenue Service. Health Savings Accounts and Other Tax-Favored Health Plans When sending money after January 1, tell your HSA custodian which tax year the contribution is for. Otherwise they’ll likely apply it to the current year, which can create excess contribution problems on top of leaving the prior year under-funded.
What Happens If You Contribute Too Much
Going over the annual limit creates an excess contribution, and the IRS charges a 6% excise tax for every year the overage stays in the account.7Office of the Law Revision Counsel. 26 U.S. Code 4973 – Tax on Excess Contributions to Certain Tax-Favored Accounts and Annuities The tax compounds annually. A $500 excess left in place for three years would cost $30 each year, reported on Form 5329.8Internal Revenue Service. Instructions for Form 5329
You can head off the penalty for the current year by withdrawing the excess amount, along with any earnings it generated, before your tax filing deadline including extensions. The withdrawn earnings are taxable in the year you pull them, but the excess principal itself isn’t hit with the 20% non-qualified distribution penalty. Report contributions and corrections on Form 8889.9Internal Revenue Service. About Form 8889, Health Savings Accounts (HSAs)
Two situations cause most excess contributions: switching employers mid-year and receiving HSA deposits from both plans, and miscalculating a prorated limit after gaining or losing HDHP coverage during the year. If either applies, reconcile your total deposits across every source before December 31.
State Tax Treatment
The federal rules above are what the IRS enforces. State treatment is separate. California and New Jersey don’t recognize HSA contributions as deductible for state income tax, so both employee and employer contributions show up as taxable state income on your W-2 in those states, and investment earnings inside the account are also subject to state tax. The federal contribution limits and tax savings still apply; the state-level benefit just isn’t there.