I'm confused about how a HDHP and a HSA relate. I understand that there are tax advantages and the money in an HSA is yours to keep.

Like any other health plan, an HSA-compatible plan, the associated HDHP, has an annual deductible and monthly premiums.

But if I am paying the insurance company monthly premiums for this HDHP, why would I also want to save up money in an HSA?

What good is the money in an HSA when I am already paying for the health plan? I cannot pay the premiums with the HSA, as this is a non-medical withdrawal.

If I am hospitalized, does not the insurance cover me? Isn't that the point? Why would I need these additional HSA funds?

Or vice-versa, if I pay for my hospitalization with my HSA debit card, why would I be paying premiums for the HDHP?

What is the connection here?

  • Oops, never mind, I was misinformed, I just discovered -- your HSA can pay for your portion of the premiums on an employer-sponsored HDHP (but only if you are 65 or older), but not for an individually-purchased HDHP unless you are drawing federal or state unemployment benefits. (Can't the IRS make anything simple??)
    – Kromey
    May 18, 2011 at 20:31

2 Answers 2


Michael McGowan's answer is correct.

The HDHP is like conventional insurance -- it is not like a "health care plan" that we're all used to. I.e. you don't want to have it pay out -- if it pays out, something bad has happened to you. (Just like you hope to never make a claim on your homeowner's, disability, or AD&D insurance -- that means something bad happened to you.) There are minor exceptions -- some HDHPs may cover preventive care, immunizations, etc to some extent.

The bonus in the case of the HDHP is that you get to put money to cover the deductible into a tax deferred account. The HSA is effectively a self insurance fund with the HDHP as backup.

Here's a concrete example.

Say you have an HDHP with a $2500 deductible. The monthly premium is $500. You put $3000 into your HSA.

Scenario 1: You remain mostly healthy throughout the year. You have a single doctor's visit, the doctor's office submits a claim to your insurance. The insurance doesn't pay because you haven't met your deductible, and you get a bill for $150. You write the doctor a check for $150 out of your HSA.

Here, you've spent $6000 on your HDHP premiums, contributed $3000 to your HSA, and spent $150 of that on health care. At the end of the year, your HSA balance is $2850.

In the following year, assume you plan to contribute another $3000 to your HSA. You can increase your deductible on the HDHP to $5000 (since you'll have $6000 in your HSA to cover out of pocket costs) and your monthly premium might go down to $400.

Scenario 2: You are hospitalized for a week. The hospital submits a $15000 claim to your insurance. The insurance pays $12500 since your deductible is met after $2500. The hospital sends you a bill for $2500 for the balance. You write a check to the hospital out of your HSA.

Again, you've spent $6000 on your HDHP premiums and contributed $3000 to your HSA. At the end of the year, your HSA balance is $500.

Scenario 3: You are hospitalized for two days in December 2011, and then again for two days in January 2012. Your deductible reset on January 1, 2012. The hospital submits two claims to your insurance: one in 2011 for $5000 and one in 2012 for $5000. The insurance company pays $2500 on the first one and you get a bill for the other $2500. Same thing for the second one -- you've got to meet the deductible all over again. You write the hospital a check from your HSA to pay the first one. Then you've only got $500 left in your HSA. But you were planning to make another $3000 HSA contribution for 2012 anyway, so you make the contribution, write a $2500 check to pay the second bill, and you've now got a balance of $1000 in your HSA -- and since you've met the deductible for 2012 you should have no more out of pocket expenses. (Assuming your plan doesn't have copays.)

  • Thank you for your concise scenarios. Is the deductible an annual fee for the HDHP or one time?
    – user3560
    May 5, 2011 at 17:11
  • The deductible resets yearly (or per plan period if you are not on a calendar year basis). So you're at risk for the full amount of the deductible every year. See my edit.
    – bstpierre
    May 5, 2011 at 20:57

Someone please feel free to correct me on this, but I believe the point is that the HSA is used to pay for that high deductible, and the insurance takes care of additional costs beyond the deductible. I believe your premiums are lower as a result of the high deductible, but the HSA money helps to offset that cost of those deductibles when you encounter them.

  • Agreed. The HSA is for any out of pocket expenses not covered by the HDHP.
    – Stainsor
    May 5, 2011 at 17:04

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