Four eligibility rules, then four enrollment paths. Whether you are self-employed, working a W-2 job, or buying your own coverage, this guide walks the IRS rules in plain English and points you to the path that fits.
To get an HSA in 2026, you need an HDHP (minimum $1,650 self-only or $3,300 family deductible), no disqualifying other coverage, no Medicare enrollment, and no dependent status on someone else's tax return. Once you qualify, open an HSA at any IRS-approved trustee - Fidelity and Lively are the most-recommended individual providers. The HSA belongs to you, not your employer, and travels with you between jobs.
Step 1: Verify your HSA eligibility
All four of these must be true on the first day of the month for that month to count. The rules below quote IRS Publication 969 verbatim so you can verify each one, not just trust the summary.
1
You must be covered by a High-Deductible Health Plan (HDHP)
You need HDHP coverage on the first day of the month to contribute that month. For 2026, the plan must have a minimum deductible of $1,650 (self-only) or $3,300 (family) and capped out-of-pocket maximums of $8,300 / $16,600.
“You are covered under a high deductible health plan (HDHP), described later, on the first day of the month.”
The HDHP requirement is the cornerstone rule. The HSA only exists as a tax-advantaged complement to a high-deductible plan - if your health plan is not an HDHP, you cannot contribute. The IRS defines HDHP strictly by deductible and out-of-pocket maximum, not by carrier marketing. Verify with your plan documents that both numbers fall inside the 2026 brackets.
Common gotchas
Marketing materials calling a plan 'HSA-compatible' are not enough - confirm the deductible and OOP max against the IRS numbers above.
Mid-year HDHP enrollment uses the last-month rule: if you have HDHP coverage on December 1, you can contribute the full year's max as long as you stay HDHP-covered through the entire next year (testing period).
Switching from HDHP to non-HDHP mid-year prorates your contribution limit by the months you were eligible.
2
You cannot have other health coverage that pays first-dollar
You can only have HDHP coverage. A spouse's PPO, an FSA, or secondary insurance that pays before you hit the HDHP deductible disqualifies you. Several types of coverage ARE allowed - see exceptions below.
“You have no other health coverage except what is permitted under Other health coverage, later.”
The IRS does not want you stacking tax-advantaged accounts when one of them already covers the first dollar of expenses. If you have a general-purpose FSA (yours OR your spouse's), or a non-HDHP plan as secondary, you cannot contribute to an HSA. The exceptions below are the named categories that the IRS treats as compatible.
Common gotchas
Spouse's general-purpose FSA disqualifies BOTH spouses from HSA contributions, even if you're not on the FSA plan.
A limited-purpose FSA (dental + vision only) is allowed and pairs well with an HSA.
Hospital indemnity, accident, dental, vision, disability, and long-term care insurance are explicitly allowed alongside an HDHP.
Telehealth-only coverage was a COVID-era exception that has now expired - check your employer benefits guide carefully.
3
You cannot be enrolled in Medicare
Once you enroll in Medicare (Part A, B, C, or D), HSA contributions stop. You can still spend existing HSA balances tax-free on qualified expenses, but no new money goes in.
“You aren't enrolled in Medicare.”
Medicare is non-HDHP coverage by definition under IRS rules. If you file for Social Security at or after age 65, you are automatically enrolled in Medicare Part A - and the enrollment can be retroactive up to 6 months (but never earlier than your 65th birthday month). The retroactive enrollment can also retroactively disqualify your prior HSA contributions for those months. If you plan to keep contributing past 65, you must defer Social Security AND actively decline Part A enrollment, which requires understanding the trade-offs first.
Common gotchas
Filing for Social Security after 65 triggers automatic Medicare Part A enrollment with retroactivity of up to 6 months (or back to your 65th birthday month, whichever is later) - which can retroactively disqualify prior HSA contributions.
If you delay Medicare past 65 (still working, employer plan), you stay HSA-eligible. Talk to a Medicare planner before age 65 if HSA contributions matter to you.
Spouse on Medicare does NOT disqualify YOU - only your own enrollment matters for your own HSA.
4
You cannot be claimed as a dependent on someone else's tax return
If a parent or anyone else can claim you as a dependent, you cannot open or contribute to your own HSA. This catches college students under 24 on a parent's plan most often.
“You can't be claimed as a dependent on someone else's tax return.”
The IRS treats dependent status as a flag that someone else is responsible for your medical expenses. A 22-year-old on a parent's HDHP plan can BE COVERED, but cannot OPEN their own HSA if the parent still claims them. The parent's HSA can still spend on the dependent's expenses (different rule), but the dependent is locked out of their own account.
Common gotchas
Under-26 children on a parent's HDHP are covered by the plan but cannot contribute to their own HSA while claimed as dependents.
Once a young adult files their own return and is not claimed by a parent, they become HSA-eligible if all other rules pass.
Stop-the-clock moment: dependency is tested per tax year, so the calendar year you stop being a dependent is the first year you can contribute.
Read the underlying rules at IRS Publication 969 (updated annually each November for the following tax year).
Coverage you ARE allowed to have alongside an HDHP
The “no other coverage” rule is narrower than it sounds. The IRS explicitly permits these categories because they do not duplicate HDHP first-dollar coverage.
Limited-purpose FSA (dental + vision only)
A limited-purpose FSA pays for dental and vision expenses only - it cannot touch medical claims that would otherwise count toward your HDHP deductible. This is the only flavor of FSA compatible with an HSA. Some employers also offer a post-deductible FSA that activates only after you meet the HDHP deductible - also compatible.
Dental, vision, accident, disability, and long-term care insurance
Standalone dental, vision, accident, disability, and long-term care policies are explicitly permitted because they cover categories the HDHP typically excludes or pay you cash rather than first-dollar medical claims. You can carry any combination alongside your HDHP without losing HSA eligibility. You can also pay long-term care premiums from your HSA (subject to age-based annual caps).
Disease-specific or fixed-indemnity coverage
Cancer insurance, critical illness coverage, or fixed-indemnity policies that pay a set dollar amount per hospital day are allowed. The key is that they pay flat dollar amounts to YOU, not first-dollar medical claims to providers.
Hospital indemnity coverage
Hospital indemnity insurance pays you a fixed daily amount for each day spent in a hospital. Because the payout is per-day cash, not first-dollar medical reimbursement, it does not disqualify HSA eligibility.
Long-term care policies
Long-term care insurance is named separately in Pub 969 because it both serves as a permitted form of other coverage AND its premiums can be paid from HSA funds, subject to age-based caps that adjust annually.
2026 HSA limits at a glance
HDHP requirements
Self-only minimum deductible
$1,650
Family minimum deductible
$3,300
Self-only max out-of-pocket
$8,300
Family max out-of-pocket
$16,600
HSA contribution caps
Self-only
$4,400
Family
$8,750
Catch-up (age 55+)
+$1,000
Per Rev. Proc. 2025-19 (IRS annual adjustment). Verified May 2026.
Step 2: Pick your enrollment path
The mechanics of opening an HSA differ depending on whether you are self-employed, working a W-2 job, on your own, or in transition. Each path has its own guide.
If your employer offers an HDHP and an HSA, enroll during open enrollment. Payroll deductions skip FICA tax - the biggest unique advantage of this path.
Who it's for
W-2 employees at companies with HDHP-eligible health plans and HSA administration in place.
Detailed guide for this path is on the way - the rules above and the 2026 limits still apply.
Your HSA belongs to YOU, not the employer. You can keep, transfer, or consolidate at any time without tax consequences.
Who it's for
Anyone changing jobs, leaving a job, retiring, or rolling over an old employer HSA into a better-fit provider.
Detailed guide for this path is on the way - the rules above and the 2026 limits still apply.
Edge cases worth knowing before you open one
Last-month rule + testing period
If you have HDHP coverage on December 1, you can contribute the full year's maximum that year - but only if you stay HSA-eligible through all 12 months of the following year. Fail the testing period and the IRS treats the over-contribution as taxable income plus a 10% penalty. Safer alternative: prorate by the number of months you were eligible.
Medicare auto-enrollment at 65 (and retroactive Part A)
Filing for Social Security at or after 65 automatically enrolls you in Medicare Part A with retroactivity that goes back up to 6 months OR to your 65th birthday month, whichever is later. The retroactive coverage can disqualify HSA contributions you made for those same retroactive months. If you want to keep contributing past 65, defer Social Security AND actively decline Part A. Talk to a Medicare planner before turning 65 if HSA contributions matter.
Spouse's FSA disqualifies you both
A general-purpose FSA disqualifies HSA contributions for both spouses, even if only one is on the FSA. The fix is to switch to a limited-purpose FSA (dental and vision only) or drop the FSA. This catches a lot of dual-income households at open enrollment.
Adult children under 26 on a parent's HDHP
A 22-year-old on a parent's HDHP can be covered by the plan but cannot open their own HSA while still claimed as a dependent. Once the young adult files their own return without being claimed, they become HSA-eligible. The parent's HSA can still pay for the adult child's qualified medical expenses (different rule, see IRS Pub 502).
Frequently asked questions
Who is eligible to open an HSA?
Four rules: you must be covered by an HDHP, you cannot have other non-HDHP coverage (with named exceptions like dental and vision insurance), you cannot be enrolled in Medicare, and you cannot be claimed as a dependent on someone else's tax return. All four must be true on the first day of the month for that month to count as an HSA-eligible month.
Can I open an HSA without my employer?
Yes. Your employer does not need to offer the HSA itself - they only need to offer a qualifying HDHP, or you can buy one individually through the marketplace or off-marketplace. Once you have HDHP coverage, you can open an HSA at any provider you choose (Lively, Fidelity, HSA Bank, etc.). The HSA belongs to you, not the employer.
How much can I contribute to an HSA in 2026?
$4,400 for self-only HDHP coverage, $8,750 for family HDHP coverage. If you are 55 or older, you can add a $1,000 catch-up contribution on top. Contributions can come from payroll deduction (if your employer offers it), direct deposit you make yourself, or both - the cap is the cap regardless of source.
What counts as a High-Deductible Health Plan (HDHP)?
For 2026, a self-only HDHP needs a minimum $1,650 deductible and a maximum $8,300 out-of-pocket cap. Family HDHP needs $3,300 minimum deductible and $16,600 maximum out-of-pocket. Carrier marketing calling a plan 'HSA-compatible' is not enough - verify both numbers against your plan documents before assuming you qualify.
Can I have an HSA if my spouse has a regular FSA?
No. A general-purpose FSA - including one belonging to your spouse - is considered other health coverage and disqualifies BOTH of you from HSA contributions. The fix is to switch the spouse to a limited-purpose FSA (dental and vision only), which is explicitly compatible with HSA eligibility, or to drop the FSA entirely.
Where should I open my HSA?
For investors, Fidelity HSA (zero fees, full brokerage access) consistently ranks at the top. For modern interfaces and self-directed Schwab investing, Lively is a strong fit. For employer-mandated providers like HealthEquity or Optum Bank, you can usually transfer your balance to a better-fit provider once per year via a trustee-to-trustee transfer. The HSA belongs to you, not your employer - you control where it lives.
How long does it take to open an HSA?
Most online HSA providers (Lively, Fidelity, HSA Bank) take 5-10 minutes to open the account once you have your HDHP confirmation. Funding usually takes 2-5 business days for the first ACH transfer to clear. If you are setting up payroll deduction through your employer, allow one to two pay cycles for the deduction to start hitting your HSA.
Can I still contribute to an HSA after age 65?
Only if you have not enrolled in Medicare. Once you enroll in Medicare Part A, B, C, or D, HSA contributions stop. Filing for Social Security at 65 auto-enrolls you in Part A with up to 6 months of retroactive coverage - which can also retroactively disqualify prior-year HSA contributions. If staying HSA-eligible past 65 matters, defer Social Security and actively decline Part A enrollment, and talk to a Medicare planner first.
Does the IRS care which HSA provider I use?
No. The IRS treats all qualified HSA trustees the same way - banks, brokerages, credit unions, fintech administrators, all qualify as long as they are IRS-approved trustees. Choose based on fees, investment options, customer experience, and (if applicable) employer match - not on tax treatment. The contribution limits and deduction rules are identical across providers.
What if I get HDHP coverage mid-year?
You can use the 'last-month rule': if you have HDHP coverage on December 1, you can contribute the full year's maximum that year, as long as you stay HDHP-covered through all 12 months of the following year (the testing period). If you fail the testing period, the IRS treats the extra contributions as taxable income plus a 10% penalty. Alternatively, prorate your contribution by the number of months you were HSA-eligible.
