Should You Pay Medical Expenses with Your HSA — or Cash?

I had one of those mildly annoying moments yesterday.

I went to the dermatologist and learned, somewhat unexpectedly, that my provider was no longer in my insurance network. Bummer.

I had already carved out the time for the appointment, so I decided to go ahead and simply pay out of pocket. The bill ended up being a few hundred dollars, certainly not ideal, but it could have been worse.

Then came the interesting question.

When it was time to pay, I paused and thought: Should I use my HSA account for this, or just put it on my regular credit card?

I ended up using my normal credit card.

My instinct was this: for some reason, I didn’t want to touch the HSA money. That got me thinking about whether that instinct actually made financial sense. As it turns out, for many people, it might.

Health Savings Accounts (HSAs) are a little unusual because they receive incredibly favorable tax treatment. Contributions generally reduce your taxable income going in, the money grows tax-free if invested, and withdrawals are tax-free when used for qualified medical expenses. That combination is so good that many planners refer to HSAs as having a “triple tax advantage.”

In some ways, an HSA can actually be even more attractive than a Roth IRA. A Roth gives you tax-free growth and tax-free withdrawals, but an HSA also gives you the upfront deduction.

That is powerful. My thought process at the dermatologist was simple:

If this money can continue growing tax-free for years (or decades) should I really spend it on a few hundred dollar expense today?

For me, the answer felt like “probably not.”

What I learned afterward made the decision even more interesting.

Apparently, if you pay for a qualified medical expense out of pocket, you do not necessarily have to reimburse yourself right away. As long as the expense occurred after your HSA was established and you keep proper documentation, you can reimburse yourself later (even many years later). I didn’t realize this. 

That means someone could theoretically pay medical expenses out of pocket throughout their working years, allow the HSA to remain invested and continue compounding, and later reimburse themselves tax-free.

I’ll admit: I wish I had realized this more clearly before my dermatologist appointment because I did not keep the receipt. Lesson learned.

Going forward, I am officially starting a folder called: “HSA Receipts”

because this feels like one of those small habits that could become surprisingly valuable over time.

Of course, context matters here.

If paying medical expenses out of pocket would create financial stress, then by all means use the HSA. That is exactly what it exists for. Likewise, if your HSA is just sitting in cash and not invested, there may be less advantage to preserving it.

But for people who are fortunate enough to comfortably pay medical costs out of pocket (and who are investing their HSA balance) there may be a compelling case for treating the HSA less like a checking account and more like a long-term retirement healthcare reserve.

Healthcare expenses tend to rise as we age. Medicare premiums, prescriptions, dental work, vision costs, long-term care, and unexpected medical issues have a way of showing up eventually.

Viewed through that lens, preserving HSA dollars today may simply be a way of taking care of your future self.

My takeaway from an unexpectedly expensive dermatologist appointment?

Sometimes a mildly annoying bill turns into an interesting financial planning lesson. And apparently, I should start saving my receipts.