If you're age 55 or older and married, you don't automatically need to calculate an additional HSA contribution amount for Form 8889. This calculation is only required if you're eligible for an HSA catch-up contribution and choose to claim it on your tax return.
For 2026, eligible taxpayers age 55 or older can make an additional HSA catch-up contribution of up to $1,000. This catch-up amount is separate from the regular HSA contribution limit and may need to be prorated if you weren't eligible for every month of the year.
When Do You Need to Calculate an Additional Contribution Amount?
Complete the Additional Contribution Amount Worksheet only if all of the following apply:
- You were age 55 or older during the tax year.
- You were eligible to make an HSA catch-up contribution.
- You are claiming a catch-up contribution on Form 8889.
- You were not an eligible individual for all 12 months of the year.
How to Determine Your Eligible Months
A month counts as an eligible month if, on the first day of that month:
- You or your spouse had family coverage under a High Deductible Health Plan (HDHP); and
- You were not enrolled in any part of Medicare.
If either requirement wasn't met on the first day of the month, that month does not count as an eligible month.
Keep in mind that enrollment in Medicare makes you ineligible to contribute to an HSA for that month, even if you remain covered by an HDHP. Publication 969 and Form 8889 instructions use this monthly eligibility rule when determining contribution limits.
Important Things to Know
- The HSA catch-up contribution limit remains $1,000 for eligible individuals age 55 or older.
- If you were eligible for all 12 months, you can generally use the full $1,000 catch-up amount and do not need this worksheet.
- The catch-up contribution belongs to the eligible spouse. If both spouses are age 55 or older, each spouse may qualify for a separate $1,000 catch-up contribution, but each catch-up contribution must be made to that spouse's own HSA.
- Enrollment in any part of Medicare makes you ineligible to make HSA contributions for those months.
- The regular 2026 HSA contribution limits are $4,400 for self-only HDHP coverage and $8,750 for family HDHP coverage, before any eligible catch-up contribution is added.
Do I Need to Calculate an Additional HSA Contribution if I’m Over 55 and Married?
Only if you are eligible for and choose to make an HSA catch‑up contribution.
If you were age 55 or older and married at the end of the year, you do not automatically have to calculate an Additional Contribution Amount for Form 8889. The calculation is required only when you are eligible for and claiming a catch‑up contribution.
If you are not eligible or are not making a catch‑up contribution, your Additional Contribution Amount is $0, and no worksheet is needed.
✅ When the Calculation Is Needed
You should use the worksheet only if all of the following apply:
✅ You were age 55 or older during the tax year
✅ You are eligible for an HSA catch‑up contribution
✅ You are claiming a catch‑up contribution on Form 8889
✅ You were not eligible for all 12 months of the year
📅 Step 1: Determine Your Eligible Months
You are considered eligible for a month if both conditions are met on the first day of that month:
✅ You or your spouse had family coverage under a High Deductible Health Plan (HDHP)
✅ You were not enrolled in Medicare for that month
⚠️ If either condition is not met, that month does not count as eligible.
🧮 Step 2: Calculate the Additional Contribution Amount
Use the worksheet below to determine the amount to enter on Form 8889, only if required.
🧾 Additional Contribution Amount Worksheet
Line 1
💲 $1,000 × Number of Eligible Months
Line 2
➗ Divide Line 1 by 12
✅ The result is your Additional Contribution Amount for Form 8889.
📌 Important Notes
ℹ️ The $1,000 catch‑up contribution is the annual maximum and is prorated based on eligible months
ℹ️ If you were eligible for all 12 months, the catch‑up amount is $1,000 — no worksheet is necessary
ℹ️ Enrollment in any part of Medicare disqualifies that month