FEHB high deductible plans and the HSA: who they suit

How an FEHB HDHP works

Three moving parts, and the third is the one people miss.

• A low premium. High deductible plans are usually among the cheapest in the programme.
• A real deductible. You pay the first chunk of costs yourself, other than preventive care, which is covered from the first dollar.
• A plan contribution to your HSA. Most FEHB high deductible plans pass part of the premium straight into your health savings account each month. That money is yours immediately, and it stays yours if you change plans, leave government, or retire.

The tax treatment is the reason people chase these plans: money goes in untaxed, grows untaxed, and comes out untaxed when spent on qualified medical costs. Nothing else in the federal benefits package does all three.

The 2027 numbers

The IRS publishes HSA figures early, so the 2027 limits are already set.

Your plan's contribution counts toward those limits, so subtract it before deciding how much to add yourself. A spouse aged 55 or over needs their own HSA to make their own catch-up contribution; it cannot go into yours.

Who it suits

• You can cover the deductible from savings today. Not next year, today. That is the whole test of whether the low premium is real.
• You are in a high marginal bracket. The deduction is worth more the more tax you pay, and federal employees in expensive metro areas often clear the threshold where it matters.
• You want an investable account. Money you do not spend rolls forward and can be invested, which turns the HSA into a second retirement account earmarked for medical costs.
• You use little care in a typical year. Preventive care is covered before the deductible, so a healthy year costs you the premium and little else.

Who it does not suit

• Anyone within six months of Medicare. See below. This one has a tax bill attached.
• Anyone who cannot absorb a bad month. A low premium is not a saving if the deductible goes on a credit card.
• People who want predictable costs. Standard plans trade a higher premium for copays you can plan around.
• Anyone in a general-purpose health care FSA. It disqualifies you from contributing. FSAFEDS' limited expense account, covering dental and vision, is the compatible version.

The Medicare trap

Enrolling in any part of Medicare, Part A included, ends your HSA eligibility. The part that catches people is the lookback: Part A can be backdated up to six months from the date you apply. Contributions made during those retroactive months become excess contributions, and you have to pull them back out or pay a penalty.

The practical rule is to stop HSA contributions six months before you plan to enrol in Medicare. If you are working past 65 and thinking about an FEHB high deductible plan, count backwards from your intended enrolment date before you elect it.

What happens to FEHB at 65 is a separate decision, covered on our sister site in turning 65: the money moves.

How to compare it properly

Premium alone tells you nothing. For each plan you are weighing, add up:

• Your yearly premium share.
• Plus what you would realistically spend out of pocket, using last year as the guide.
• Minus what the plan pays into your HSA.
• Minus the tax you save on your own HSA contributions.

Then run the same total for a bad year, where you hit the out-of-pocket maximum. A plan that wins in a normal year and survives a bad one is the one to take. Check the catastrophic limit in the brochure, since that is the worst case the plan allows.

Common questions