The 2026 HSA limits are $4,400 and $8,750
For calendar year 2026, the regular annual HSA contribution limit is $4,400 for self-only HSA-eligible high-deductible health plan coverage and $8,750 for family coverage. These are contribution limits, not required deductibles, reimbursement amounts, or separate employee and employer buckets.
The same IRS guidance defines a 2026 HSA-qualified HDHP as having a deductible of at least $1,700 for self-only coverage or $3,400 for family coverage, with in-network annual out-of-pocket expenses generally no higher than $8,500 or $17,000 respectively. Meeting those dollar thresholds alone does not prove HSA eligibility. Use the plan’s written HSA-eligible designation and review the official 2026 figures in Revenue Procedure 2025-19.
Rules effective for 2026 also expand HSA availability. Certain bronze or catastrophic individual-market plans available through an ACA Exchange can be treated as HDHPs even when they do not satisfy the ordinary deductible or out-of-pocket thresholds, and a qualifying direct primary care service arrangement may not by itself be disqualifying coverage. The details matter; IRS Notice 2026-5 explains the new exceptions. This is another reason to verify the specific plan instead of judging eligibility from one deductible number.
Eligibility is normally determined month by month
The standard calculation counts a month when the person is an eligible individual on the first day of that month. The calculator multiplies the annual coverage limit by the number of eligible months and divides by 12. It is designed for one unchanged coverage type during all months entered.
Coverage under a non-HDHP, enrollment in Medicare, being claimable as another person’s dependent, or coverage under a general-purpose health FSA or HRA can disqualify a month. Limited-purpose and post-deductible arrangements can follow different rules. The 2026 IRS Employer’s Tax Guide to Fringe Benefits confirms that qualified status is determined monthly.
The age-55 catch-up belongs to one HSA owner
An eligible individual who is age 55 or older during 2026 can receive an additional $1,000 annual HSA contribution allowance. Under the standard monthly method, this calculator prorates that allowance using the same count of eligible months.
When two spouses are each eligible and age 55 or older, each can potentially receive a separate catch-up, but each catch-up must go into that spouse’s own HSA. One spouse cannot place both catch-ups into one account. Use the special path when married shared-family-limit rules apply.
Employer deposits reduce what remains
Employer HSA contributions count toward the limit. Pre-tax employee salary reductions made through a cafeteria plan are also treated as employer contributions for this purpose. Add those amounts even when they do not appear as a personal deduction on the tax return.
Regular contributions made directly by the owner, a family member, or another person also consume the limit. A trustee-to-trustee HSA rollover generally is not a regular contribution. A qualified HSA funding distribution from an IRA uses special reporting and reduces available contribution room, so it belongs on the special path rather than in the ordinary-contribution field.
The last-month rule can increase the limit and create a testing period
A person who is HSA-eligible on December 1 may be able to use the last-month rule and be treated as eligible for the full year based on December coverage. That larger allowance comes with a testing period that generally runs through December 31 of the following year. Losing eligibility during the testing period can cause income inclusion and an additional tax.
This calculator deliberately does not choose the last-month rule automatically. Compare the standard monthly amount with the current Form 8889 instructions and professional advice before relying on a testing-period election.
Medicare and married family coverage need extra care
Beginning with the first month of Medicare enrollment, the HSA contribution limit is generally zero. Medicare Part A can sometimes be retroactive when enrollment is delayed, turning earlier deposits into excess contributions. Confirm the actual effective date rather than counting months only from the application date.
If either eligible spouse has family HDHP coverage, the regular family allowance can be shared between the spouses rather than duplicated. Spouses may agree on an allocation, while catch-up amounts remain account-owner specific. Coverage changes, separate plans, only one eligible spouse, divorce, death, and employer deposits can change the worksheet.
Check every source before making the final deposit
Compare payroll records, employer contributions, HSA custodian activity, and any deposits made by another person. Confirm the tax-year designation because a contribution made in early 2027 may be assigned to 2026. Excess contributions can trigger tax consequences if not corrected under the applicable rules and deadline.
After determining HSA room, compare workplace retirement room with the 2026 401(k) contribution limit calculator, the separate IRA rules with the 2026 Roth IRA contribution limit calculator, and potential Medicare income adjustments with the 2026 Medicare IRMAA calculator.
This calculator provides general educational arithmetic for one standard 2026 HSA monthly-limit scenario. It is not tax, legal, health-plan, benefits, payroll, Medicare, investment, or financial advice. Plan qualification, other coverage, dependent status, monthly eligibility, Medicare effective dates, married-person rules, last-month testing periods, funding distributions, Archer MSAs, contribution timing, and tax reporting can change the result. Official sources were accessed July 27, 2026.