What are the 2025 HSA contribution limits?

For 2025 the IRS limit is 4,300 USD for self-only HDHP coverage and 8,550 USD for family coverage. Account holders age 55 or older by year end can add a 1,000 USD catch-up contribution on top.

How does mid-year enrollment affect my limit?

Under the general rule, your limit is prorated by the number of months you were HSA-eligible, counting each month where you had HDHP coverage on the first day. The annual limit is divided by 12 and multiplied by your eligible months.

What is the last-month rule?

If you are HSA-eligible on December 1, the last-month rule lets you contribute the full annual amount even if you enrolled mid-year. However you must remain HSA-eligible through the following December (the testing period) or face tax plus a 10% penalty on the extra amount.

Can both spouses make catch-up contributions?

Yes, but each spouse's 1,000 USD catch-up must go into their own HSA. A married couple with family coverage shares the 8,550 USD family limit but each adds their own catch-up to their separate account if both are 55 or older.

Do employer contributions count toward the limit?

Yes. Employer contributions and any amounts from a salary-reduction cafeteria plan count against your annual HSA limit. Subtract them from the figure shown to find how much you can still personally contribute.

US HSA Contribution Limit Calculator

A Health Savings Account (HSA) has an annual IRS contribution limit that depends on your coverage type, your age, and how many months of the year you were eligible. This calculator applies the 2025 limits and prorates correctly for partial-year coverage.

How it works

annual limit = 4,300 (self-only)  or  8,550 (family)   [2025]
catch-up     = 1,000 if age 55+
general rule = annual limit × eligible months / 12  + catch-up
last-month   = full annual limit + catch-up (must pass the testing period)

The catch-up is a flat 1,000 USD and is not prorated under the IRS rules in the same way, but for partial-year general-rule estimates many people prorate it too; this tool keeps the catch-up full for the last-month rule and prorates the base limit for the general rule.

Example

Family coverage starting in July (6 eligible months), age 54: general rule gives 8,550 × 6 / 12 = 4,275 USD. If you are eligible on December 1 and elect the last-month rule, you may contribute the full 8,550 USD, provided you stay HSA-eligible through the next December.

Notes

If you take the last-month rule and lose eligibility during the testing period, the extra contribution becomes taxable income plus a 10% penalty. Employer contributions count toward the limit — subtract them to find your remaining personal room.