HSA Contribution Limits and the 55+ Catch-Up

The Health Savings Account is the only account in the U.S. tax code that is deductible going in, tax-free growing, and tax-free coming out when used for qualified medical expenses. The contribution limits are the gate to all three benefits — here is exactly how much, exactly when.

2025 contribution limits

• Self-only HDHP coverage: $4,300
• Family HDHP coverage: $8,550
• Age-55 catch-up (per spouse): +$1,000

The limits are set under IRC §223(b) and adjusted annually for inflation; the 2025 amounts were published in Revenue Procedure 2024-25. The $1,000 catch-up has been stuck at $1,000 since 2009 because §223(b)(3) was written as a flat dollar figure with no indexing language.

Who is eligible to contribute

You must be enrolled in a high-deductible health plan (HDHP) on the first day of the month, have no other disqualifying coverage, not be enrolled in Medicare, and not be claimed as a dependent. An HDHP for 2025 is defined as a plan with at least a $1,650 deductible (self) or $3,300 (family), and an out-of-pocket maximum no greater than $8,300 (self) or $16,600 (family).

The two-spouse situation

If both spouses are 55 or older and both want the catch-up, each must contribute their $1,000 to a separate HSA in their own name. There is no joint HSA. A family of two with both spouses age 55+ can therefore contribute $8,550 (family) + $1,000 + $1,000 = $10,550 total, but only if it is split across two accounts.

The last-month rule and the testing period

If you are HSA-eligible on December 1 of the year, the last-month rule under IRC §223(b)(8) lets you contribute the full annual limit as if you had been eligible all year. The catch: you must remain eligible through the entire following calendar year (the "testing period"). Breaking the testing period turns the excess contribution into taxable income and triggers a 10% additional tax under §223(f)(5).

Common mistakes

• Contributing while on Medicare. Enrollment in any part of Medicare — including Part A only — ends HSA eligibility. Social Security enrollment after age 65 retroactively enrolls you in Part A for up to six months. Stop HSA contributions six months before claiming Social Security after 65.
• Treating the family limit as combined. Family-coverage spouses share the $8,550 family limit but can allocate it between two HSAs in any proportion. The $1,000 catch-up is per spouse and cannot be doubled into one account.
• Missing the prior-year contribution window. You can contribute for 2025 until April 15, 2026 — but tell the custodian to code the deposit "prior year."
• Investing the cash drag. Most HSAs default to a cash sweep paying near zero. Move balances above the working cushion into the HSA's investment menu — that is where the tax-free growth lives.

Sources

• Internal Revenue Code §223, Health Savings Accounts (Cornell LII): law.cornell.edu/uscode/text/26/223
• IRS Revenue Procedure 2024-25, 2025 HSA inflation-adjusted amounts: irs.gov/pub/irs-drop/rp-24-25.pdf
• IRS Publication 969, Health Savings Accounts and Other Tax-Favored Health Plans: irs.gov/forms-pubs/about-publication-969
• IRS Form 8889 instructions, HSA reporting: irs.gov/forms-pubs/about-form-8889
• Centers for Medicare & Medicaid Services, Medicare enrollment and HSA interaction: medicare.gov/basics/get-started-with-medicare/sign-up

RetirementCheck101 confirms your HDHP eligibility and sizes your HSA gap automatically. Explore the free educational tool to lock in the deduction.