First, prove the plan is HSA-eligible
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An HSA begins with eligibility—not just a high deductible. Confirm the plan, coverage tier, and every contribution before funding it.
2026 LIMITS
The age-55+ HSA catch-up remains $1,000 for someone not enrolled in Medicare. The out-of-pocket ceiling includes deductibles, copays, and other covered amounts, but not premiums.
A high deductible alone does not make a plan HSA-eligible. Check the plan's Summary Plan Description or benefits portal for the explicit words “HSA-eligible HDHP” — if it is not designated as such, do not assume.
When your employer offers it, contribute through payroll deduction: payroll HSA contributions skip Social Security and Medicare taxes (7.65%) on top of the income-tax deduction — a benefit you do not get contributing from your bank account.
The last-month rule lets you contribute the full annual amount if you are HSA-eligible on December 1 — but you must stay eligible through December 31 of the following year (the testing period). Fail the test and the extra contributions become taxable income plus a 10% penalty.
Once your HSA holds a cash cushion for near-term medical costs, most custodians let you invest the remainder. Growth and withdrawals for qualified medical expenses stay tax-free — the triple-tax advantage that makes the HSA one of the strongest accounts in the tax code.
Your next steps
- Confirm the plan is designated HSA-eligible.
- Match your coverage tier: self-only or family.
- Count every 2026 HSA contribution toward the applicable limit.
Check your understanding
Select each question to reveal the answer.
Planning questions
- Is your current health plan explicitly designated HSA-eligible, and is your coverage self-only or family?
- How much has already been contributed to your HSA from every source in 2026?